Stirring blade and stirring structure

Abstract

To provide a stirring blade improved in stirring efficiency and a stirring structure.SOLUTION: A stirring blade 3 comprises a boss 61 in a cylindrical shape into which a lower end of a stirring shaft is inserted, an upper disk 11 in a discoid shape connected to an outer periphery of the boss 61 to extend in a horizontal direction, and a lower disk 21 in a discoid shape arranged at a position away downward from the upper disk 11. A plurality of upper blades 31a-31h and lower blades 41a-41h are provided, with a predetermined interval in a circumferential direction along respective outer peripheral edges 13 and 23 of an upper surface 12 of the upper disk 11 and of a lower surface 22 of the lower disk 21, on the upper surface and the lower surface. An opening communicating with spaces partitioned by the upper disk 11 and the lower disk 21 at a position contacting the outer periphery of the boss 61 is formed at a central part of the upper disk 11. Between the upper disk 11 and the lower disk 21, a plurality of blades 51a-51f are mounted on the boss 61 in a horizontal direction and in a radial fashion. The blades 51a-51f are formed in curved shapes in which tip portions 53 thereof are backed away with respect to a rotating direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an agitator blade and an agitator structure, and more particularly to an agitator blade to be installed inside a stirred tank, and an agitator structure equipped with an agitator shaft and an agitator blade. [Background technology]

[0002] FIG. 21 is a front view showing a schematic internal structure of a stirring vessel using a conventional disperser blade.

[0003] 21, agitation tank 261, which is a cylindrical container with a circular horizontal cross section, has four baffle plates 267 installed at 90° intervals along its inner wall 266, and an agitator 251 is inserted from above into the agitation tank 261 and installed therein, with a lid (not shown) closed from above. The agitator 251 is mainly composed of an agitation shaft 252 extending in the vertical direction as a rotation axis for agitation, a dispersing blade 253 connected to the lower end of the agitation shaft 252, and an external motor (not shown) connected to the upper end of the agitation shaft 252. A predetermined amount of fluid 270, which is the object to be agitated, is placed inside the agitation tank 261.

[0004] Figure 22 is a schematic enlarged plan view of a metal blank before manufacturing the wing portion of the dispersing blade shown in Figure 21, and Figure 23 is a diagram showing the wing portion of the dispersing blade shown in Figure 21, where (A) is a schematic plan view and (B) is a view taken along the arrows XXIIIB-XXIIIB.

[0005] 21 to 23, the dispersing blade 253 is made of a metallic material such as a steel plate, and has a boss 255 into which the agitating shaft 252 is inserted, and a disk-shaped blade portion 256 connected to the outer periphery of the boss 255. On the outer periphery of the blade portion 256, upward blades 257a to 257h and downward blades 258a to 258h protruding in the vertical direction are alternately and continuously formed. In the center of the blade portion 256, an agitating shaft hole 276 into which the agitating shaft 252 is inserted is formed.

[0006] Wing portion 256 is formed from a metal blank 273 as shown in Fig. 22. Metal blank 273 has a saw-shaped blade 275 formed on the periphery of a circular flat plate like a tipped saw. By bending this blade 275 alternately in the up and down directions by 90 degrees along the bending curves shown by the dashed dotted lines, upward blades 257a to 257h and downward blades 258a to 258h as shown in Fig. 23 are formed.

[0007] The blade portion 256 thus formed is fixed to the boss 255 through the boss connection holes 277a to 277d provided around the agitator shaft hole 276 by means of mounting members such as screws (not shown), thereby completing the disperser blade 253.

[0008] Referring again to FIG. 21, in use, the stirring shaft 252 rotates in the direction of the arrow B by the drive of an external motor (not shown). When the dispersion blade 253 rotates accordingly, a flow that swirls around the dispersion blade 253 occurs in the fluid 270. At that time, the flow speed of the fluid 270 is relatively fast at the closer distance from the dispersion blade 253, and the flow speed of the fluid 270 is relatively slow at the farther distance. This speed difference causes a shear force to act on the fluid 270. In addition, with the rotation of the dispersion blade 253, each of the upward blades 257a to 257h and the downward blades 258a to 258h enters the fluid 270. At that time, each of the upward blades 257a to 257h and the downward blades 258a to 258h comes into contact with the fluid 270, causing an impact force to act on the fluid 270. The action of such shear force and impact force promotes the stirring (dispersion) of the fluid 270.

[0009] As another stirring device, for example, there is one shown in Patent Document 1.

[0010] The stirring device shown in Patent Document 1 includes a base of a truncated cone that rotates around an axis and multiple blades provided on the inclined portion of the base. Each of the multiple blades is a stirring blade that has an inner end in a radial direction perpendicular to the axis, a forward curved portion connected to the inner end and convex forward in the direction of rotation, and a rearward curved portion connected radially outward from the forward curved portion and convex backward in the direction of rotation. The blade is composed of multiple surfaces with different inclination angles in the direction of rotation, and adjacent surfaces are connected to each other via bent portions.

[0011] The forward curved portion makes it possible to more strongly suck in the object to be stirred at the inner end while moving it more smoothly radially outward. The rearward curved portion makes it possible to more forcefully expel the object to be stirred from the stirring blade radially outward. The synergistic effect of the enhanced suction by the forward curved portion and the enhanced expel by the rearward curved portion promotes mixing of the entire object to be stirred. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] JP 2020-097012 A Summary of the Invention [Problem to be solved by the invention]

[0013] As described above, the conventional dispersing blade 253 generates a flow in the fluid 270 along the rotation direction of the agitating shaft 252, and promotes agitation for the purpose of dispersing the fluid 270 by applying a large shear force and impact force particularly in the vicinity of the dispersing blade 253. On the other hand, due to its structure, it does not have the ability to discharge the fluid 270, so that a flow of the fluid 270 circulating in the vertical direction is unlikely to occur. Therefore, as the viscosity of the fluid 270 increases, the flow of the fluid 270 becomes poor, and there is a risk of poor agitation occurring.

[0014] In addition, the agitator disclosed in Patent Document 1 has a certain discharge capacity due to the shape of its blades, but there is a demand for an agitator that has better discharge capacity while maintaining shear capacity.

[0015] The present invention has been made to solve the above-mentioned problems, and has an object to provide an agitating blade and an agitating structure having excellent agitation efficiency. [Means for solving the problem]

[0016] In order to achieve the above object, the invention described in claim 1 is an agitator impeller that is installed inside a mixing tank in order to agitate the material to be stirred and is attached to an agitator shaft that extends in the vertical direction and serves as the axis of rotation during stirring, and is equipped with circular upper and lower discs that are attached to the agitator shaft, extend horizontally, and are positioned at positions spaced apart in the vertical direction, an upper blade that is installed on the upper surface of the upper disc and applies an impact force to the material to be stirred when it enters the material to be stirred, a lower blade that is installed on the lower surface of the lower disc and applies an impact force to the material to be stirred when it enters the material to be stirred, an opening that is provided in at least one of the upper and lower discs and communicates with the space partitioned by the upper and lower discs, and a plate-shaped blade that is installed between the upper and lower discs and expels the material to be stirred that flows in from the opening in a horizontally outward direction.

[0017] With this configuration, the material to be stirred can be sucked in from the axial direction and expelled horizontally outward, while applying shear force and impact force to the material to be stirred.

[0018] The invention as set forth in claim 2 is the structure of the invention as set forth in claim 1, in which each of the upper blades and the lower blades is provided in plurality at predetermined intervals in the circumferential direction.

[0019] With this configuration, the upper blade and the lower blade advance into the material to be stirred at a predetermined interval, applying an impact force.

[0020] The invention as set forth in claim 3 is the same as the invention as set forth in claim 2, in which the upper blade and the lower blade are provided along the outer periphery of the upper disc and the lower disc in the vicinity of the outer periphery of each disc.

[0021] With this configuration, the shear force and impact force can be applied to the material being stirred at a position close to the material.

[0022] The invention described in claim 4 is such that, in the configuration of the invention described in claim 3, each of the upper blade and lower blade has a sawtooth shape with the vertical apex located at its rear end and inclined in two stages from the rear end to the tip, and when viewed in the vertical direction, the rear ends are positioned on the outer peripheral edges of the upper and lower discs, and the tips are positioned closer to the agitator shaft and in the direction of rotation of the agitator shaft than the rear ends.

[0023] With this configuration, the upper blade and the lower blade can smoothly penetrate into the material to be stirred.

[0024] The invention described in claim 5 is the same as the invention described in claim 1, in which the opening is provided in the center portion of the upper disk.

[0025] With this configuration, the material to be stirred is sucked into the gap between the upper and lower disks from above the upper disk and is expelled horizontally outward.

[0026] The invention described in claim 6 is the same as the invention described in claim 1, in which the openings are provided in the central portions of the upper and lower disks.

[0027] With this configuration, the material to be stirred is sucked between the upper and lower disks from above the upper disk and below the lower disk, and is then expelled horizontally outward.

[0028] The invention described in claim 7 is the same as the invention described in claim 1, in which the opening is provided in the central portion of the lower disk.

[0029] With this configuration, the material to be stirred is sucked into the gap between the upper and lower disks from below the lower disk and is expelled horizontally outward.

[0030] The invention described in claim 8 is the same as the invention described in claim 1, in which a plurality of slats are attached horizontally and radially.

[0031] With this configuration, the material to be stirred can easily flow along the blades.

[0032] The invention as set forth in claim 9 is the same as the invention as set forth in claim 8, in which the tip portion of the slat has a curved shape that is recessed in the direction of rotation.

[0033] With this configuration, the material to be stirred can easily flow rearward along the blades.

[0034] The invention described in claim 10 has the configuration of the invention described in claim 1, wherein each of the upper disk, lower disk and blade plate is attached to the agitator shaft via a boss, each of the upper disk and blade plate is integrally connected to the boss, and the lower disk is attached to the boss by a bolt.

[0035] With this configuration, the lower disc is removable.

[0036] The invention described in claim 11 is the same as the invention described in claim 1, in which the upper disk, the upper blade, the lower disk and the lower blade are each formed by combining separate members.

[0037] With this configuration, the number of upper and lower blades and the mounting angle can be easily changed.

[0038] The invention described in claim 12 is an agitation structure used inside a stirring tank to agitate an object to be stirred, comprising an agitation shaft extending in the vertical direction which serves as the axis of rotation during stirring, and an agitation blade described in any one of claims 1 to 11 which is attached perpendicular to the agitation shaft.

[0039] With this configuration, the material to be stirred can be sucked in from the axial direction and expelled horizontally outward, while applying shear force and impact force to the material to be stirred. Effect of the Invention

[0040] As described above, the invention described in claim 1 can apply shear force and impact force to the material being stirred while sucking it in from the axial direction and expelling it horizontally outward, thereby improving the stirring efficiency.

[0041] In the invention described in claim 2, in addition to the effect of the invention described in claim 1, the upper blade and the lower blade advance into the object to be stirred at a predetermined interval and apply an impact force, thereby further improving the stirring efficiency.

[0042] The invention as set forth in claim 3 has the effect of the invention as set forth in claim 2, and further improves the stirring efficiency by allowing shear force and impact force to be applied to the object being stirred at a position close to the object.

[0043] The invention as set forth in claim 4 has the same effect as the invention as set forth in claim 3, and further improves the mixing efficiency since the upper blade and the lower blade can smoothly penetrate into the object to be mixed.

[0044] In addition to the effects of the invention described in claim 1, the invention described in claim 5 has the following features: the material being stirred is sucked between the upper and lower disks from above the upper disk and then expelled horizontally outward, making it easier for the material being stirred located above the stirring blades to circulate in the vertical direction, thereby improving the stirring efficiency.

[0045] In addition to the effects of the invention described in claim 1, the invention described in claim 6 has the following features: the material being stirred is sucked between the upper and lower discs from above the upper disc and below the lower disc and then expelled horizontally outward, making it easier for the material being stirred located above and below the stirring blades to circulate in the vertical direction, thereby improving the stirring efficiency.

[0046] In addition to the effects of the invention described in claim 1, the invention described in claim 7 has the following features: the material being stirred is sucked in between the upper and lower disks from below the lower disk and then expelled horizontally outward, making it easier for the material being stirred located below the mixing blades to circulate in the vertical direction, thereby improving the stirring efficiency.

[0047] The invention as recited in claim 8 has the effect of the invention as recited in claim 1, and in addition, since the material to be stirred easily flows along the blades, the discharge performance is improved.

[0048] The invention as recited in claim 9 has the effect of the invention as recited in claim 8, and further improves the discharge performance since the material to be stirred can easily flow rearward along the blades.

[0049] The invention as recited in claim 10 has the same effect as the invention as recited in claim 1, and in addition, the lower disk is removable. Therefore, by attaching and detaching the lower disk as required, assembly precision is improved.

[0050] The invention described in claim 11 has the effect of the invention described in claim 1, and in addition, the number of upper and lower blades and the mounting angle can be easily changed, so that design changes can be easily made. The invention described in claim 12, in addition to the effects of the inventions described in claims 1 to 11, can apply shear force and impact force to the material being stirred while sucking it in from the axial direction and expelling it horizontally outward, thereby improving the stirring efficiency. [Brief description of the drawings]

[0051] [Figure 1] FIG. 1 is a front view showing a schematic internal structure of an agitation vessel of an agitation structure according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view showing a schematic internal structure of the stirring impeller in the portion “II” shown in FIG. [Diagram 3] FIG. 2 is a diagram showing the stirring impeller shown in FIG. 1, where (A) is a schematic plan view, (B) is a schematic front view, and (C) is a schematic bottom view. [Figure 4]2A and 2B are diagrams showing the components constituting the agitator blade shown in FIG. 1, in which (1) is a schematic plan view showing an upper disk member, (2) is a schematic plan view showing a lower disk member, and (3) is a schematic front view showing each of the upper blade member and the lower blade member. [Diagram 5] 2 is a schematic diagram showing a bending process of the blade plate member of the agitating impeller shown in FIG. 1. FIG. [Figure 6] FIG. 2 is a schematic cross-sectional view showing the boss of the stirring blade shown in FIG. [Figure 7] 7A to 7C are diagrams showing the first step of assembling the members prepared in FIGS. 4 to 6, in which (A) is a diagram showing the state in which the upper blade member is attached to the upper disk member, and (B) is a view taken along the arrows VIIB-VIIB in (A). [Figure 8] 7A to 7C are diagrams showing the second step of assembling the components prepared in FIGS. 4 to 6, in which (A) is a diagram showing the state in which the slat member has been attached to the boss, and (B) is a view taken along the arrows VIIIB-VIIIB in (A). [Figure 9] 7A to 7C are diagrams showing the third step of assembling the parts prepared in FIGS. 4 to 6, in which (A) is a diagram showing the state in which the upper circular plate shown in FIG. 7 and the slat plate attached to the boss are combined, and (B) is a view taken along the arrows IXB-IXB in (A). [Figure 10] 7A to 7C are diagrams showing the fourth step of assembling the components prepared in FIGS. 4 to 6, in which (A) is a diagram showing the state in which the lower blade member is attached to the lower disc member, and (B) is a view taken along the XB-XB arrows in (A). [Figure 11] 10A to 10C are diagrams showing the fifth step of assembling the parts prepared in FIGS. 4 to 6, in which (A) is a schematic plan view showing the lower circular plate shown in FIG. 10 attached to the boss, and (B) is a schematic enlarged view of the “XIB” portion. [Figure 12] 11A to 11C are diagrams showing an agitator blade of an agitator structure according to a second embodiment of the present invention, where (A) is a schematic plan view, (B) is a schematic front view, and (C) is a schematic bottom view. [Figure 13] FIG. 13 is a front view showing a schematic internal structure of an agitation vessel having an agitation structure using the agitation blade shown in FIG. 12. [Figure 14]FIG. 14 is an enlarged view showing a schematic internal structure of the stirring impeller in the portion "XIV" shown in FIG. [Figure 15] 11A to 11C are diagrams showing an agitator blade of an agitator structure according to a third embodiment of the present invention, where (A) is a schematic plan view, (B) is a schematic front view, and (C) is a schematic bottom view. [Figure 16] 16 is a front view showing a schematic internal structure of an agitation vessel of an agitation structure using the agitation blade shown in FIG. 15. FIG. [Figure 17] FIG. 17 is an enlarged view showing a schematic internal structure of the stirring impeller of the portion “XVII” shown in FIG. [Figure 18] These are plan views showing schematic configurations of the upper and lower blades of the agitator impeller according to other embodiments of the present invention, where (1) is a diagram showing a fourth embodiment, (2) is a diagram showing a fifth embodiment, and (3) is a diagram showing a sixth embodiment. [Figure 19] These are plan views showing the shape of the blades of an agitator impeller according to other embodiments of the present invention, where (1) is a diagram showing the seventh embodiment, (2) is a diagram showing the eighth embodiment, (3) is a diagram showing the ninth embodiment, and (4) is a diagram showing the tenth embodiment. [Figure 20] FIG. 1 shows the results of Test 1. [Figure 21] FIG. 1 is a front view showing a schematic internal structure of a stirring vessel using a conventional disperser blade. [Figure 22] 22 is a schematic enlarged plan view of a metal blank before the blade portion of the dispersing blade shown in FIG. 21 is manufactured. FIG. [Figure 23] 22A and 22B are views showing the blade portion of the dispersing blade shown in FIG. 21, in which (A) is a schematic plan view and (B) is a view seen from the arrows XXIIIB-XXIIIB. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0052] FIG. 1 is a front view showing a schematic internal structure of an agitation vessel of an agitation structure according to a first embodiment of the present invention.

[0053] Referring to FIG. 1, the agitation tank 71 of the agitation structure 10 in this embodiment has a structure basically similar to that of the conventional agitation tank 261 described above, and is a cylindrical container with a circular horizontal section, with four baffle plates 77 installed at 90° intervals on the inner wall 76. The agitation device 1 is inserted from above into the agitation tank 71 and installed, with a lid closed on the top (not shown). The agitation device 1 is mainly composed of an agitation shaft 2 extending in the vertical direction, which is the up-down direction that serves as the rotation axis of the agitation, an agitation blade 3 connected to the lower end of the agitation shaft 2 in the horizontal direction (perpendicular to the agitation shaft 2), and an external motor (not shown) connected to the upper end of the agitation shaft 2. The specific structure of the agitation blade 3 will be described later.

[0054] When in use, a predetermined amount of fluid 70 (which in the present invention refers to a continuous body having fluidity, and includes low to high viscosity liquids, gases, powders, pastes, mixtures of gases and liquids, different types of liquids, or mixtures of solids and liquids) is put into the stirring tank 71 as the object to be stirred. Thereafter, the stirring shaft 2 is rotated in the direction of arrow A1 by driving an external motor (not shown), and the stirring blade 3 rotates in the stirring tank 71 accordingly, stirring the fluid 70.

[0055] FIG. 2 is an enlarged schematic diagram showing the internal structure of the agitator impeller in the "II" portion shown in FIG. 1, and FIG. 3 is a diagram showing the agitator impeller shown in FIG. 1, where (A) is a schematic plan view, (B) is a schematic front view, and (C) is a schematic bottom view.

[0056] 1 to 3, the agitator impeller 3 has a cylindrical boss 61 into which the lower end of the agitator shaft 2 is inserted, a circular upper disk 11 that is connected to the outer periphery of the agitator shaft 2 via the boss 61 and extends horizontally, and a circular lower disk 21 that is disposed at a position spaced downward from the upper disk 11. The outer periphery 13 of the upper disk 11 and the outer periphery 23 of the lower disk 21 have the same diameter (outer diameter).

[0057] A plurality of upper blades 31a-31h are provided in the vicinity of the outer circumferential edge 13 of the upper surface 12 of the upper disc 11 at a predetermined interval in the circumferential direction along the outer circumferential edge 13. Each of the upper blades 31a-31h is attached so that the plate-shaped blade's thickness surface is in contact with the upper surface of the upper disc 11, and has an agitator shaft side end disposed on the agitator shaft 2 side and an outer circumferential edge side end disposed on the outer circumferential edge 13 side. The agitator shaft side end is the part that enters the fluid 70 first as the tip 33 of the blade, and the outer circumferential edge 13 side end is the rear end 34 of the blade. Each of the upper blades 31a-31h has a sawtooth shape in which the apex 35 in the vertical direction is located above the rear end 34 of the blade and is inclined downward in two steps from the apex 35 to the tip 33. When viewed from the top and bottom, the rear end 34 (end portion on the outer peripheral edge) is positioned on the outer peripheral edge 13 of the upper disc 11, and the tip 33 (end portion on the agitator shaft side) is positioned closer to the agitator shaft 2 than the rear end 34 and in the direction of rotation indicated by arrow A1 of the agitator shaft 2.

[0058] A plurality of lower blades 41a-41h are provided at predetermined intervals in the circumferential direction along the outer circumferential edge 23 in the vicinity of the outer circumferential edge 23 on the lower surface 22 of the lower disk 21. The configuration regarding the shape and arrangement of each of the lower blades 41a-41h is basically similar to the configuration of the upper blades 31a-31h described above, but they are circumferentially shifted from the upper blades 31a-31h so as to be alternately arranged when viewed in the vertical direction (so as not to overlap when viewed in the vertical direction).

[0059] In addition, an annular opening 16 is provided in the central portion of the upper disk 11 at a position where it contacts the outer periphery of the boss 61 , and communicates with a space 69 defined by the upper disk 11 and the lower disk 21 .

[0060] Between the upper disc 11 and the lower disc 21, a plurality of blade plates 51a to 51f are attached to the agitator shaft 2 in a horizontal and radial direction via bosses 61. The blade plates 51a to 51f have tip portions 53 that are curved so as to recede with respect to the direction of rotation indicated by the arrow A1.

[0061] The effect of configuring the stirring blade 3 in this way will be described later.

[0062] When such an agitator 3 is rotated in the direction of the arrow A1 in an agitator tank 71 containing a fluid 70, a flow of the fluid 70 swirls around the agitator 3. In addition, the fluid 70 located above the agitator 3 is sucked into the space 69 from the opening 16 as the agitator 3 rotates, and is pushed out by the blades 51a to 51f and discharged in the horizontal outward direction. The discharged fluid 70 circulates in the vertical direction by hitting the inner wall 76 of the agitator tank 71. Furthermore, the circulation in the vertical direction is promoted by hitting the baffle plate 77. In addition to this state, the flow speed of the fluid 70 is relatively fast at a closer distance from the agitator 3, and the flow speed of the fluid 70 is relatively slower at a farther distance. This speed difference can apply a shear force to the fluid 70. Also, the rotation of the agitator 3 causes the upper blades 31a to 31h and the lower blades 41a to 41h to come into contact with the fluid 70 when entering the fluid 70, thereby applying an impact force. The action of such shear force and impact force promotes the agitation (dispersion) of the fluid 70.

[0063] In this way, the agitator blade 3 configured as described above and the agitator structure 10 equipped with the agitator blade 3 can apply shear force and impact force to the fluid 70, which is the object to be agitated, while sucking it in from the axial direction and expelling it horizontally outward, thereby improving the agitation efficiency.

[0064] As described above, the upper blades 31a-31h and the lower blades 41a-41h of the stirring blade 3 are arranged at predetermined intervals in the circumferential direction, so that the upper blades 31a-31h and the lower blades 41a-41h advance into the fluid 70 at predetermined intervals and apply an impact force, thereby further improving the stirring efficiency.

[0065] Furthermore, as described above, the upper blades 31a-31h and the lower blades 41a-41h of the stirring blade 3 are provided along the outer peripheral edge 13 of the upper disc 11 and the outer peripheral edge 23 of the lower disc 21, respectively, so that shear force and impact force can be applied to the fluid 70 at positions close to each other, thereby further improving the stirring efficiency.

[0066] Furthermore, as described above, the upper blades 31a-31h and lower blades 41a-41h of the agitator impeller 3 have a sawtooth shape and their tips are positioned closer to the agitator shaft 2 and in the direction of rotation of the agitator shaft 2 than the rear end. This allows the upper blades 31a-31h and lower blades 41a-41h to penetrate smoothly into the fluid 70, thereby further improving the agitation efficiency.

[0067] Furthermore, as described above, the opening 16 of the agitator blade 3 is provided in the central portion of the upper disk 11 as described above, so that the fluid 70 is sucked in between the upper disk 11 and the lower disk 21 from above the upper disk 11 and then expelled horizontally outward, which makes it easier for the fluid 70 located above the agitator blade to circulate in the vertical direction, thereby improving the agitation efficiency.

[0068] Furthermore, as described above, the agitating impeller 3 has the vane plates 51a to 51f attached horizontally and radially, so that the fluid 70 can easily flow along the vane plates 51a to 51f, improving the discharge performance.

[0069] Furthermore, as described above, the blade plates 51a to 51f of the agitating impeller 3 have a curved shape, so that the fluid 70 easily flows rearward along the blade plates 51a to 51f, and thus the discharge performance is further improved.

[0070] Next, a manufacturing process of the stirring impeller 3 will be described.

[0071] FIG. 4 shows the components constituting the agitator blade shown in FIG. 1, where (1) is a schematic plan view showing the upper disk member, (2) is a schematic plan view showing the lower disk member, and (3) is a schematic front view showing each of the upper blade member and the lower blade member.

[0072] 3 and 4, upper disk member 11' corresponding to upper disk 11 of agitator impeller 3, lower disk member 21' corresponding to lower disk 21, upper blade members 31a'-31h' and lower blade members 41a'-41h' corresponding to upper blades 31a-31h and lower blades 41a-41h are formed by punching or cutting out a metal plate such as a steel plate.

[0073] First, referring to FIG. 4(1), the overall diameter (outer diameter) d of the upper disk member 11′ having a disk shape that is a perfect circle when viewed from above is 1 is used as the standard for setting the dimensions of each member. A circular opening 16' is formed in the center of the upper disk member 11'. A part of this opening 16' becomes the opening 16 of the upper disk 11 of the mixing blade 3 after assembly. From the viewpoint of good suction of the material to be mixed, the diameter d 2 is the outer diameter d of the upper disk member 11' 1 The distance between the upper blade members 31a' to 31h' is set to half of the total distance between the upper blade members 31a' to 31h'.

[0074] Next, referring to FIG. 4(2), the lower disk member 21′ has an outer diameter d 3 The outer diameter d of the upper disk member 11' is 1 and has agitator shaft hole 27 for inserting agitator shaft 2 and bolt holes 28a-28d for inserting bolts in the center. The dashed dotted lines indicate the mounting positions of lower blade members 41a'-41h'. The mounting positions of lower blade members 41a'-41h' are shifted in the circumferential direction so as not to overlap with the mounting positions of upper blade members 31a'-31h' described above when viewed in the up-down direction when upper disk member 11' and lower disk member 21' are overlapped.

[0075] Furthermore, referring to (3) in Figure 4, the upper blade members 31a' to 31h' and the lower blade members 41a' to 41h' have a saw blade shape that is inclined in two stages from a vertex located above the rear end to the tip end with the flat plate-like thickness surface facing in the vertical direction as described in Figure 3.

[0076] FIG. 5 is a schematic diagram showing a bending process of the blade plate members of the agitating impeller shown in FIG.

[0077] Referring to FIG. 5, a rectangular flat plate made of a metal material such as a steel plate is placed at a point O, and the thickness radius R from the center line t to the thickness center line t is d 1 The bending process is performed so that the total arc length is CL 1 Then, the required arc length CL 2Both ends are cut off so as to form the vane plate members 51a' to 51h'.

[0078] FIG. 6 is a schematic cross-sectional view showing the boss of the stirring blade shown in FIG.

[0079] 6, the boss 61 is formed by machining a round bar made of a metal material into a cylindrical shape. The boss 61 has an outer diameter d 4 is 0.3×d 1 The upper part of the boss 61 is provided with a screw tap 63 for inserting a screw for connecting the stirring shaft 2 and the stirring blade 3 in the horizontal outward direction. In addition, the lower part of the boss 61 is provided from the lower end toward the upper part with four bolt taps 62b, 62d (some not shown) for inserting bolts for fixing the lower disk 21.

[0080] FIG. 7 is a diagram showing the first step of assembling the members prepared in FIGS. 4 to 6, in which (A) is a diagram showing the state in which the upper blade member is attached to the upper disk member, and (B) is a view taken along the arrows VIIB-VIIB in (A).

[0081] Referring to Fig. 7(A), the upper blade members 31a'-31h' are attached by welding to the positions marked on the upper disk member 11' in Fig. 4(A). At this time, the upper blade members 31a'-31h' are arranged so that their rear ends contact the outer circumferential edge 13' of the upper disk member 11' with the tips of the upper blade members 31a'-31h' facing the direction of rotation. This results in the upper disk 11 shown in Fig. 7(B).

[0082] Figure 8 is a diagram showing the second process of assembling the parts prepared in Figures 4 to 6, where (A) is a diagram showing the state in which the slat part is attached to the boss, and (B) is a view taken along the VIIIB-VIIIB arrow of (A).

[0083] Referring to Fig. 8(A), next, the lower disc member 21' is attached to the boss 61 with the bolts 68a-68d. Then, the vane plate members 51a'-51f' are arranged at the positions of marks (not shown) previously marked on the upper surfaces of the lower disc member 21' and the boss 61. Note that the vane plate members 51a'-51f' are welded only at the connection portions with the boss 61. This results in the state shown in Fig. 8(B). Thereafter, the bolts 68a-68d and the lower disc member 21' are removed again before proceeding to the next process.

[0084] FIG. 9 is a diagram showing the third step of assembling the parts prepared in FIGS. 4 to 6, in which (A) is a diagram showing the state in which the upper circular plate shown in FIG. 7 is combined with the slat plate attached to the boss, and (B) is a view taken along the arrows IXB-IXB in (A).

[0085] 9, upper disk 11 having upper blades 31a to 31h attached thereto is placed on vanes 51a to 51f attached to boss 61, and upper disk 11 and vanes 51a to 51f are welded together. This results in the state shown in FIG. 9(B).

[0086] Figure 10 is a diagram showing the fourth step of assembling the parts prepared in Figures 4 to 6, where (A) is a diagram showing the state in which the lower blade member is attached to the lower disc member, and (B) is a view taken along the XB-XB arrows in (A).

[0087] Referring to Fig. 10, the lower blade members 41a'-41h' are attached by welding to the marked positions of the lower disk member 21' shown in Fig. 4(B). At this time, the lower blade members 41a'-41h' are arranged so that the rear end of each of them contacts the outer circumferential edge 23' of the lower disk member 21' with the leading ends of the lower blade members 41a'-41h' facing the rotation direction. This results in the lower disk 21 shown in Fig. 10(B).

[0088] Figure 11 shows the fifth step of assembling the parts prepared in Figures 4 to 6, where (A) is a schematic plan view showing the lower circular plate shown in Figure 10 attached to the boss, and (B) is a schematic enlarged view of the "XIB" portion.

[0089] Referring to Fig. 11(A), the lower disc 21 to which the lower blades 41a to 41h are attached is reattached to the lower end of the boss 61 by the bolts 68a to 68d. Then, referring to Fig. 11(B), the exposed portion 55 of the blade plate 51a exposed outside the outer peripheral edge 13 of the upper disc 11 and the outer peripheral edge 23 of the lower disc 21 is ground off with a grinder or the like to match the outer peripheral edge 13 of the upper disc 11 and the outer peripheral edge 23 of the lower disc 21. The same process is carried out for the other blade plates 51b to 51f, and the mixing blade 3 shown in Fig. 3 is completed.

[0090] As described above, in this type of agitator blade 3, the lower disk 21 (lower disk member 21') is attached to the boss 61 via a bolt, making the lower disk 21 removable. Therefore, the assembly precision can be improved by attaching and detaching the lower disk 21 as required, such as during welding.

[0091] As described above, the agitator blade 3 is constructed by combining the upper disc member 11', lower disc member 21', upper blade members 31a'-31h' and lower blade members 41a'-41h', with the upper disc 11, upper blades 31a-31h, lower disc 21 and lower blades 41a-41h being separate members, so that the number and mounting angle of the upper blades 31a-31h and lower blades 41a-41h can be easily changed, facilitating design changes.

[0092] Fig. 12 shows an impeller of an agitation structure according to a second embodiment of the present invention, (A) being a schematic plan view, (B) being a schematic front view, and (C) being a schematic bottom view. Fig. 13 is a schematic front view of the internal structure of an agitation vessel of an agitation structure using the impeller shown in Fig. 12, and Fig. 14 is an enlarged view of the internal structure of the impeller in the "XIV" portion shown in Fig. 13.

[0093] Incidentally, the configuration of the agitating blade 93 and the agitating structure 90 in this embodiment is basically the same as the agitating blade 3 and the agitating structure 10 in the first embodiment, so the differences will be mainly described here.

[0094] 12 and 14, the configurations of the upper blades 105a-105h, lower blades 115a-115h, and vane plates 121a-121f of the impeller 93 are the same as those described in the first embodiment. The basic configurations of the upper disc 101 and the lower disc 111 are also the same as those in the first embodiment, but the central portions of the upper disc 101 and the lower disc 111 are provided with annular openings 106 and 116 that communicate with the space 99 between the discs 101 and the lower disc 111, respectively. The effects of this configuration will be described later.

[0095] The boss 131 is fixed to the annular flat upper mounting plate 103 by welding or the like at a position where the lower end of the boss 131 is flush with the lower surface of the upper disk 101. The vane plates 121a to 121f are attached to a cylindrical vane plate attachment shaft 132. In this embodiment, the lower disk 111 is attached integrally to the vane plates 121a to 121f by welding or the like, not by bolts. In addition, the lower end of the vane plate attachment shaft 132 is attached to the annular flat lower mounting plate 113. As a result, the above-mentioned opening 116 becomes annular like the opening 106 of the upper disk 101.

[0096] Such an agitator impeller 93 is inserted into the inside of an agitator tank 94 having the same configuration as the first embodiment, as an agitator 91 connected to an external motor (not shown) and inserted into the inside of the agitator tank 94 having the same configuration as the first embodiment. A fluid 130 similar to that of the first embodiment is also inserted into the agitator tank 94 as an object to be agitated. When the agitator shaft 92 is rotated in the direction of arrow A2, the agitator impeller 93 rotates inside the agitator tank 94, and a flow swirling around the agitator impeller 93 is generated in the fluid 130.

[0097] At this time, the fluid 130 above the upper disk 101 and below the lower disk 111 is sucked into the space 99 between the upper disk 101 and the lower disk 111 through the opening 106 of the upper disk 101 and the opening 116 of the lower disk 111, and is discharged horizontally outward. The discharged fluid 130 circulates in the vertical direction by hitting the inner wall 96 of the mixing tank 94. Furthermore, the vertical circulation is promoted by hitting the baffle plate 97. In addition to this state, a shear force can be applied to the fluid 130 due to the difference in flow speed generated in the fluid 130. Also, an impact force can be applied by contacting the fluid 130 with the upper blades 105a to 105h and the lower blades 115a to 115h when they enter the fluid 130 due to the rotation of the mixing blade 93. The action of such a shear force and impact force promotes the mixing (dispersion) of the fluid 130.

[0098] In this way, the stirring blade 93 and the stirring structure 90 equipped with the stirring blade 93 can apply shear force and impact force to the fluid 130, which is the object to be stirred, while sucking it in from the axial direction and expelling it horizontally outward, thereby improving the stirring efficiency.

[0099] As described above, the agitator blade 93 has the opening 106 provided in the central portion of the upper disk 101 and the opening 116 provided in the central portion of the lower disk 111. Therefore, the fluid 130 is sucked between the upper disk 101 and the lower disk 111 from above the upper disk and below the lower disk and is discharged horizontally outward. This makes it easier for the fluid 130 located above and below the agitator blade 93 to circulate in the vertical direction, improving the agitation efficiency.

[0100] Fig. 15 shows an impeller of an agitation structure according to a third embodiment of the present invention, (A) being a schematic plan view, (B) being a schematic front view, and (C) being a schematic bottom view. Fig. 16 is a schematic front view of the internal structure of an agitation vessel of an agitation structure using the impeller shown in Fig. 15, and Fig. 17 is an enlarged view of the internal structure of the impeller in the "XVII" portion shown in Fig. 16.

[0101] Incidentally, the configuration of the agitator blade 153 and the agitator structure 150 in this embodiment is basically the same as the agitator blade 3 and the agitator structure 10 in the first embodiment, so the differences will be mainly described here.

[0102] 15 and 17, the configurations of the upper blades 165a-165h, lower blades 175a-175h, and vane plates 181a-181f of the mixing impeller 153 are the same as those described in the first embodiment. The basic configurations of the upper disc 161 and the lower disc 171 are also the same as those in the first embodiment, but the upper disc 161 does not have an opening. The central portion of the lower disc 171 is provided with an annular opening 176 that communicates with the space 159 between the upper disc 161 and the lower disc 171. The effect of this configuration will be described later.

[0103] The boss 191 is fixed to the upper disk 161 by welding or the like at a position where its lower end is flush with the lower surface of the upper disk 161. The vanes 181a to 181f are attached to a cylindrical vane mounting shaft 192. In this embodiment, similar to the second embodiment, the lower disk 111 is integrally attached to the vanes 181a to 181f by welding or the like, not by bolts. In addition, the lower end of the vane mounting shaft 192 is attached to an annular flat lower mounting plate 193. As a result, the above-mentioned opening 176 becomes annular like the opening 116 in the second embodiment.

[0104] 15 to 17, the lower end of the stirring shaft 152 similar to that of the first embodiment is inserted into the stirring impeller 153, and the stirring device 151 connected to an external motor (not shown) is placed in a stirring tank 154 having a similar configuration to that of the first embodiment. A fluid 190 similar to that of the first embodiment is placed in the stirring tank 154 as an object to be stirred. When the stirring shaft 152 is rotated in the direction of the arrow A3, the stirring impeller 153 rotates in the stirring tank 154, and a flow swirling around the stirring impeller 153 is generated in the fluid 190.

[0105] At this time, each fluid 190 below the lower disk 171 is sucked into the space 159 between the upper disk 161 and the lower disk 171 through the opening 176 of the lower disk 111 and discharged horizontally outward. The discharged fluid 190 circulates in the vertical direction by hitting the inner wall 156 of the mixing tank 154. Furthermore, the vertical circulation is promoted by hitting the baffle plate 157. In addition to this state, a shear force can be applied to the fluid 190 due to the difference in flow speed generated in the fluid 190. Also, an impact force can be applied by contacting the fluid 190 when each of the upper blades 165a to 165h and the lower blades 175a to 175h enters the fluid 190 due to the rotation of the mixing blade 153. The action of such a shear force and impact force promotes the mixing (dispersion) of the fluid 190.

[0106] In this way, the stirring blade 153 and the stirring structure 150 equipped with the stirring blade 153 can apply shear force and impact force to the fluid 190, which is the object to be stirred, while sucking it in from the axial direction and expelling it horizontally outward, thereby improving the stirring efficiency.

[0107] As described above, the opening 176 of the mixing blade 153 is provided in the central portion of the lower disk 171, so that the fluid 190 is sucked in between the upper disk 161 and the lower disk 171 from below the lower disk 171 and then expelled horizontally outward, which makes it easier for the fluid 190 located below the mixing blade 153 to circulate in the vertical direction, thereby improving the mixing efficiency.

[0108] Figure 18 is a plan view showing schematic configurations of the upper blade and lower blade of the agitator impeller according to other embodiments of the present invention, where (1) is a diagram showing the fourth embodiment, (2) is a diagram showing the fifth embodiment, and (3) is a diagram showing the sixth embodiment.

[0109] In the fourth to sixth embodiments, the configurations other than the upper blade and the lower blade are similar to those of the first embodiment.

[0110] 18(1), the upper blade 211 and the lower blade 212 of the impeller 201 of the fourth embodiment are attached so that their rear ends protrude outward from the outer periphery of the upper and lower disks. In this type of impeller 201, the upper blade 211 and the lower blade 212 advance at a predetermined interval against the object to be stirred (not shown) and apply an impact force, improving the stirring efficiency.

[0111] 18(2), the upper blade 213 and the lower blade 214 of the impeller 202 in the fifth embodiment are disposed closer to the agitator shaft than the outer periphery of the upper and lower disks. In this type of impeller 202, the upper blade 213 and the lower blade 214 advance at a predetermined interval against the object to be agitated (not shown) and apply an impact force, improving the agitation efficiency.

[0112] 18(3), the upper blade 215 and the lower blade 216 of the mixing blade 203 of the sixth embodiment are slightly curved when viewed in the vertical direction. In this mixing blade 203, the upper blade 215 and the lower blade 216 advance at a predetermined interval against the object to be mixed (not shown) and apply an impact force, thereby improving the mixing efficiency.

[0113] Figure 19 is a plan view showing the shape of the blade plate of an agitator impeller according to another embodiment of the present invention, (1) is a diagram showing the seventh embodiment, (2) is a diagram showing the eighth embodiment, (3) is a diagram showing the ninth embodiment, and (4) is a diagram showing the tenth embodiment.

[0114] In the seventh to tenth embodiments, the configuration other than the slats is the same as that of the first embodiment.

[0115] 19(1), the mixing impeller 204 of the seventh embodiment has a linearly configured blade plate 221. Such a mixing impeller 204 allows the material to be mixed (not shown) to easily flow along the blade plate 221, improving the discharge performance.

[0116] 19(2), the mixing blade 205 of the eighth embodiment has a curved blade plate 222 with its base separated from the boss and its tip separated from the outer periphery of the lower disk. This type of mixing blade 204 allows the material to flow easily along the blade plate 222, improving the discharge performance.

[0117] 19(3), the mixing impeller 206 of the ninth embodiment has a straight blade plate 223 whose base is separated from the boss and whose tip is also separated from the outer periphery of the lower disk. This type of mixing impeller 206 allows the material to be mixed (not shown) to flow easily along the blade plate 223, improving the discharge performance.

[0118] 19(4), the mixing blade 207 of the tenth embodiment is formed by finely dotting linear blade plates 224. Such mixing blade 207 allows the material to be mixed (not shown) to easily flow along the blade plates 224, improving the discharge performance.

[0119] In the above embodiments, the diameters of the outer edges of the upper and lower disks are the same, but they may be slightly different, and as long as they produce the same effects as the present invention, they are essentially included in the present invention.

[0120] In addition, in each of the above-described embodiments, the upper and lower disks are circular in plan view, but are not limited to this. The disk shape described here includes shapes close to a circle, such as a regular hexagon, and ellipses.

[0121] Furthermore, in each of the above embodiments, the upper and lower disks have a specific configuration, but are not limited to this. It is also possible to attach two upper and lower disks having upward and downward blades formed by bending continuously saw-shaped blades provided on the periphery of a circular flat plate at 90 degrees in the up and down direction, such as the blade portion shown in the conventional dispersing blade.

[0122] Furthermore, in each of the above embodiments, the upper blade and the lower blade have a specific configuration, but are not limited to this. As long as they can apply an impact force to the object being stirred, the blades may be chamfered to have a different shape or arrangement. The number and arrangement of the blades can also be changed as needed.

[0123] Furthermore, in each of the above embodiments, the blades have a specific configuration, but this is not limited to this. As long as the effect of expelling the sucked-in material can be obtained, other shapes and arrangements may be used. The number and arrangement of the blades can also be appropriately changed as needed.

[0124] Furthermore, in each of the above embodiments, the openings of the upper and lower disks are annular and provided in the center, but they may be provided in other parts. Also, they may have other shapes as long as they can sufficiently suck in the material to be stirred.

[0125] Furthermore, in the above embodiments, the diameter of the opening is set to half the outer diameter of the upper disc, and the outer diameter of the boss is set to 0.3 times the outer diameter of the upper disc, but from the viewpoint of good suction of the material to be stirred, it is preferable that the diameter of the opening is at least half the outer diameter of the upper disc. Also, it is preferable that the length from the outer periphery of the boss to the edge of the opening is at least 0.15 times the outer diameter of the upper disc.

[0126] Furthermore, in each of the above embodiments, the upper disk, the lower disk, the upper blade, the lower blade, and the blade plate are each made of separate members, but this is not limited to this. A partially integrated member may be provided, such as by processing the upper disk and the upper blade as a single unit, or the entirety may be manufactured as a single unit using a 3D printer or the like.

[0127] Furthermore, in each of the above embodiments, the impeller is attached to the agitation shaft via a boss, but this is not limited to this. The impeller may be attached directly to the agitation shaft, or may be attached to the agitation shaft by other means.

[0128] Furthermore, in the first and fourth to ninth embodiments, the lower disk is detachably attached to the boss via a bolt, but the present invention is not limited to this and may be attached by means other than a bolt, or may be attached integrally to the boss or the blade.

[0129] Furthermore, in the second and third embodiments, the lower disk is attached integrally with the vane plate, but this is not limiting, and the lower disk may be attached detachably.

[0130] Furthermore, in each of the above embodiments, a steel plate is used, but other metal materials or materials such as wood, resin, etc. may be used as long as there is no problem with compatibility with the object to be stirred. EXAMPLES

[0131] The present invention will be described below with reference to specific examples, but the present invention is not limited to the examples shown below. <Test 1> (Distributed Experiment) 1. Test conditions The color adsorption / decolorization test was carried out using the following equipment. The achievement of uniform dispersion of the fluid was determined as the point at which decolorization proceeded due to dispersion of the fluid and was completed. Mixing tank: Inner diameter D400mm, height H800mm, liquid depth 500mm Test fluid: Starch syrup (viscosity coefficient 0.2 Pa s) Chemicals: Coloring method using 1N iodine solution, decolorization method using 1N sodium thiosulfate solution Stirring device: As Example 1, the one according to the first embodiment described above, that is, an impeller with an opening only on the upper disk, was used. The impeller is formed by integrally connecting the upper disk, lower disk, upper blade, lower blade, and blade plate, each of which is made of a metal plate with a thickness of 2 mm and made of SUS304, and a boss with an outer diameter of φ28 mm, which is made of a round bar of SUS304, by welding or the like. The blade diameter is set to φ120 mm. In addition, openings are provided on both the upper disk and the lower disk, and a separate opening blocking plate is attached to block the opening of the lower disk. In Example 3, an opening blocking plate is attached to block the opening of the upper disk. The impeller is placed at the position of the liquid depth tangent line (TL).

[0132] As Example 2, the stirring impeller according to the second embodiment described above, i.e., an impeller having openings on both the upper and lower disks, was used. The shape and installation position of the stirring impeller are the same as those of Example 1, but no opening blocking plate is used.

[0133] As Example 3, the stirring impeller according to the third embodiment described above, that is, the impeller having an opening only in the lower disk, was used. The shape and installation position of the stirring impeller are the same as those of Example 1, but the opening blocking plate is attached so as to block the opening of the upper disk.

[0134] As a comparative example, a conventional dispersing impeller was used as the background art. The dispersing impeller was formed by fixing a blade portion made of a 2 mm thick metal plate made of SUS304 to a boss made of a SUS304 round bar with an outer diameter of φ28 mm with a screw. The blade diameter was set to φ120 mm. The dispersing impeller was placed at the liquid depth TL. 2. Test Results FIG. 20 shows the results of Test 1.

[0135] In addition, the rotation speed of the stirring blades in the comparative example and examples 1 to 3 in Test 1 was the same (1200 rpm).

[0136] Referring to the figure, 15 seconds after the start of dispersion, it is visible that poorly dispersed areas occur in the upper part of the tank in Comparative Example 1, but hardly any occur in Examples 1 to 3. This is because the test fluid discharged with the rotation of the stirring blade circulates to the upper part of the tank in each of Examples 1 to 3. In addition, while it took 60 seconds from the start of dispersion to the completion of dispersion in the Comparative Example, dispersion was completed in 20 seconds in Example 1, 19 seconds in Example 2, and 39 seconds in Example 3, all of which are results that far exceed those of the Comparative Examples.

[0137] In addition to the time to complete dispersion, the power (kW) was also measured, and the less power consumed, the better the mixing efficiency. The results are shown in the table below.

[0138] [Table 1] As described above, the power required at the same rotation speed is about 2.3 times that of the comparative example in Examples 1 and 2, and about 1.4 times that of the comparative example in Example 3. However, the time required to complete dispersion is 20 seconds in Example 1, 19 seconds in Example 2, and 39 seconds in Example 3, which is significantly longer than the 60 seconds of the comparative example. Therefore, the amount of power calculated as the product of the power and the time to complete dispersion is 2.56 x 10^ in Example 1. -3 kWh, Example 2 is 2.43 x 10^ -3 kWh, Example 3 is 3.03 x 10^ -3 kWh, and the comparison example is 3.33 x 10^ -3 It is kept low compared to kWh.

[0139] Therefore, it is understood that the configurations of all of Examples 1 to 3 have more advantageous effects than the configuration of the comparative example. [Explanation of symbols]

[0140] 1, 91, 151...Mixing device 2, 92, 152...Agitator shaft 3, 93, 153, 201, 202, 203, 204, 205, 206, 207...Mixing blades 10, 90, 150...Mixing structure 11, 101, 161...Upper disc 12…Top surface 13...Outer edge of upper disc 16, 106, 116, 176…Aperture 21, 111, 171…Lower disc 22…Bottom surface 23...Outer edge of upper disc 31a~31h, 105a~105h, 165a~165h, 211, 213, 215...upper blade 33, 117, 177...Tip 34, 118, 178…rear end 35…Vertex 41a~41h, 115a~115h, 175a~175h, 212, 214, 216...lower blade 51a~51f, 121a~121f, 181a~181f, 221, 222, 223, 224...Slats 53...Tip part 61, 131, 191...Boss 68a~68d…Bolts 69, 99, 159…space 70, 130, 190...Fluid (stirred material) In addition, the same symbols in each drawing indicate the same or corresponding parts.

Claims

1. In order to stir the object to be stirred, the stirring blade is installed inside the stirring vessel and attached to a stirring shaft that extends in the vertical direction and serves as a rotation axis during stirring. An upper disk and a lower disk are attached to the stirring shaft, extend in a horizontal direction, and are arranged at positions spaced apart from each other in a vertical direction; An upper blade is installed on the upper surface of the upper disc and applies an impact force to the object to be stirred when the upper blade enters the object to be stirred; A lower blade is installed on the lower surface of the lower disc and applies an impact force to the object to be stirred when the lower blade enters the object to be stirred; an opening provided in at least one of the upper disk and the lower disk and communicating with a space defined by the upper disk and the lower disk; The agitating impeller is provided with a plate-shaped blade plate that is attached between the upper disc and the lower disc and expels the material to be stirred that flows in from the opening in a horizontal outward direction.

2. The agitator impeller according to claim 1 , wherein each of the upper blades and the lower blades is provided in a plurality at predetermined intervals in the circumferential direction.

3. The agitator impeller according to claim 2 , wherein each of the upper blade and the lower blade is provided along an outer periphery of each of the upper disc and the lower disc in the vicinity of the outer periphery of the respective disc.

4. The agitator impeller described in claim 3, wherein each of the upper blade and the lower blade has a vertical apex located at its rear end and has a sawtooth shape that slopes in two stages from the rear end to the tip, and when viewed in the vertical direction, the rear end is positioned on the outer peripheral edge of the upper disc and the lower disc, and the tip is positioned closer to the agitator shaft and in the direction of rotation of the agitator shaft than the rear end.

5. The agitator impeller according to claim 1 , wherein the opening is provided in a central portion of the upper disk.

6. The agitator blade according to claim 1 , wherein the openings are provided in central portions of the upper and lower disks.

7. The agitator impeller according to claim 1 , wherein the opening is provided in a central portion of the lower disc.

8. The agitating impeller according to claim 1 , wherein a plurality of the blade plates are attached in a horizontal and radial manner.

9. The agitator blade according to claim 8 , wherein the blade plate has a curved shape with a tip portion thereof receding in the direction of rotation.

10. The agitator impeller described in claim 1, wherein each of the upper disk, the lower disk and the blade plate is attached to the agitator shaft via a boss, each of the upper disk and the blade plate is integrally connected to the boss, and the lower disk is attached to the boss by a bolt.

11. The agitator blade according to claim 1 , wherein each of the upper disk, the upper blade, the lower disk, and the lower blade is formed by combining separate members.

12. An agitation structure used inside a stirring vessel to agitate an object to be stirred, A stirring shaft extending in the vertical direction serves as a rotation axis during stirring; An agitation structure comprising an agitation blade according to any one of claims 1 to 11 attached perpendicularly to the agitation shaft.

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