Stirring device and stirring method

Abstract

This stirring device (10) is provided with: a stirring tank (12) that accommodates a fluid; a flow blade (14) that rotates to cause the fluid to flow inside the stirring tank (12); and a shear blade (16) that is provided between the bottom (22) of the stirring tank (12) and the flow blade (14), stirs the fluid by rotating, and is provided with a blade section (17) that extends from a shear blade rotating shaft (46) toward the side wall (12a) of the stirring tank (12). At least a portion (lower end portion) of the flow blade (14) rotates between a distal end portion of the blade portion (17) and a side wall (12a) of the stirring tank (12). The normal direction of the stirring surface of the blade portion (17) is inclined with respect to both the axial direction of the shear blade rotation shaft (46) and the rotation direction of the blade portion (17). The bottom (22) of the stirring tank (12) is planar.

Description

Technical Field

[0001] The present invention relates to a stirring device and the like. Background Art

[0002] As a stirring device for stirring a fluid in a stirring tank, a stirring device including a flow blade and a disc-shaped shearing blade (dispersing blade) is disclosed in Patent Document 1. The dispersing blade provided at a central position in contact with a flow formed by the rotation of the flow blade effectively shears the fluid.

[0003] Previous technical literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2017 / 002905 Summary of the invention

[0006] Technical issues to be solved by the invention

[0007] The dispersion wing of Patent Document 1 is disc-shaped, so when the wing diameter is increased, the load power will increase, and it is difficult to achieve rotational balance. Therefore, the wing diameter of the dispersion wing of Patent Document 1 must be reduced. Specifically, as described in paragraph 0031 of Patent Document 1, the wing diameter of the dispersion wing is set to be between 10% and 30% of the tank diameter of the stirring tank. In this case, for example, if the viscosity of the fluid to be stirred by the stirring device becomes higher, the wing diameter of the dispersion wing needs to be further reduced due to power problems, which may make it difficult for the fluid to reach the dispersion wing with a small diameter.

[0008] The present invention has been made in view of such circumstances, and an object of the present invention is to provide a stirring device or the like which can effectively stir even a fluid having high viscosity or a fluid having high thixotropy.

[0009] Means for solving technical problems

[0010] In order to solve the above-mentioned problems, a stirring device in one embodiment of the present invention comprises: a stirring tank for accommodating a fluid; a flow wing for causing the fluid to flow in the stirring tank by rotating; and a stirring wing, which is arranged between the bottom of the stirring tank and the flow wing, stirs the fluid by rotating, and has a wing portion extending from its rotation axis toward the side wall of the stirring tank.

[0011] In this method, by using a non-disk-shaped stirring blade having a blade portion extending from the rotating shaft toward the side wall of the stirring tank, it is not necessary to reduce the blade diameter as in the case of the disc-shaped dispersion blade of Patent Document 1. In this way, the flow generated by the flow blade easily reaches the stirring blade whose diameter can be larger than before, so even a fluid with high viscosity can be stirred effectively.

[0012] Another embodiment of the present invention is a stirring method. The method comprises the following steps: rotating a flow wing to make a fluid flow in a stirring tank; and rotating a stirring wing provided between the bottom of the stirring tank and the flow wing at a higher speed than the flow wing to stir the fluid, wherein the wing extends from a rotation axis of the stirring wing toward a side wall of the stirring tank.

[0013] In addition, any combination of the above-mentioned constituent elements or any form of converting these expressions into a method, an apparatus, a system, a recording medium, a computer program, etc. is also included in the present invention.

[0014] Effects of the Invention

[0015] According to the present invention, even a fluid with high viscosity or a fluid with high thixotropy can be stirred efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a longitudinal sectional view of the stirring device.

[0017] Figure 2 It is a perspective view of the shearing wing when it is roughly viewed from the side.

[0018] Figure 3 is a top or bottom view of the shear wing.

[0019] Figure 4 It is a stereogram of the shear wing rotation axis. DETAILED DESCRIPTION

[0020] Hereinafter, with reference to the accompanying drawings, a method for implementing the present invention (hereinafter, also referred to as an embodiment) is described in detail. In the following description and the accompanying drawings, the same or equivalent constituent elements, parts, and processes are marked with the same symbols, and repeated descriptions are omitted. In each of the accompanying drawings, in order to simplify the description, the scale or shape of each part is appropriately set, and unless otherwise specifically stated, it is not interpreted in a restrictive manner. The embodiment is an example, and it does not limit the scope of the present invention in any way. All the features or combinations thereof described in the embodiment are not necessarily the essence of the present invention.

[0021] Figure 1 1 is a longitudinal sectional view of the stirring device 10 according to the embodiment of the present invention. Figure 1The up-down direction or longitudinal direction (i.e., the vertical direction) is set, the up-down direction, the longitudinal direction and the vertical direction are the same direction, and the left-right direction, the lateral direction and the horizontal direction are the same direction. In addition, the present invention can also be applied to a stirring device 10 that is not set along the vertical direction. In this case, the up-down direction, the longitudinal direction and the vertical direction are different, and the left-right direction, the lateral direction and the horizontal direction are different. And, as described later, in the up-down direction, the longitudinal direction and the vertical direction, the rotation axes of each wing such as the flow wing rotation axis 34 of the flow wing 14, the shear wing rotation axis 46 of the shear wing 16 and the frame wing rotation axis 52 of the frame wing 18 are set, so the up-down direction, the longitudinal direction and the vertical direction can also be called the axial direction. Moreover, the left-right direction, the lateral direction and the horizontal direction determine the diameter of the stirring tank 12, the flow wing 14, the shear wing 16 hole frame wing 18, etc., so the left-right direction, the lateral direction and the horizontal direction can also be called the radial direction.

[0022] The stirring device 10 includes: a stirring tank 12 for containing a fluid to be stirred; and rotating wings (i.e., flow wings 14, shear wings 16, and frame wings 18) that can rotate around a rotating shaft 34, 46, 52 extending in the axial direction in the stirring tank 12. The stirring tank 12 includes a cylindrical or tubular straight body 20 disposed at the top and extending in the axial direction, a bottom 22 that is continuous with the straight body 20 and disposed at the bottom, and a top 24 that is continuous with the straight body 20 and disposed at the top. The bottom 22 of the stirring tank 12 in this embodiment is a plane with the axial direction as the normal direction. As described later, by forming the bottom 22 into a plane, there is an advantage that the axial distance between the bottom 22 and the shear wings 16 can be reduced, but the present invention can also be applied to a stirring tank 12 having a bottom 22 of any shape (for example, a curved surface or an inverse cone shape as in Patent Document 1).

[0023] The flat bottom 22 of the stirring tank 12 can be mounted on the flange 21, which is formed at the bottom or the lowest part of the cylindrical side wall 12a or the straight body 20 of the stirring tank 12 and protrudes in the radial direction. That is, when assembling the stirring tank 12, the flat bottom 22 is brought into contact with the flange 21 of the straight body 20 from below and fixed with a fixing tool such as a screw. At this time, the shearing wing 16, the shearing wing rotating shaft 46, the shearing wing driving part 47, etc. described later can be pre-installed on the bottom 22, or the shearing wing 16, the shearing wing rotating shaft 46, the shearing wing driving part 47, etc. can be installed on the bottom 22 after the bottom 22 is installed on the flange 21. In this way, by forming the bottom 22 of the stirring tank 12 into a flat shape, the assemblability of the stirring tank 12 and the stirring device 10 can be improved.

[0024] Similar to the bottom 22, the top 24 of the stirring tank 12 in the present embodiment is also in the shape of a plane with the axial direction as the normal direction. The planar top 24 of the stirring tank 12 can be mounted on the flange 23, which is formed on the top or uppermost portion of the cylindrical side wall 12a or the straight body 20 of the stirring tank 12 and protrudes radially. That is, when assembling the stirring tank 12, the flat top 24 is brought into contact with the flange 23 of the straight body 20 from above and fixed with a fixing tool such as a screw. At this time, the flow blade 14, the flow blade rotating shaft 34, and the flow blade rotating shaft 34 set at the bottom can be described later. Figure 1 The flow blade drive unit not shown above, the frame blade 18, the frame blade rotation shaft 52 and the Figure 1 The frame-type wing driving unit not shown above the top is pre-installed on the top 24, and the flow wing 14, the flow wing rotating shaft 34, the flow wing driving unit, the frame wing 18, the frame wing rotating shaft 52 and the frame wing driving unit can also be installed on the top 24 after the top 24 is installed on the flange portion 23.

[0025] The inner peripheral wall or side wall 12a of the straight body portion 20 of the stirring tank 12 has a circular cross-section when viewed from above, and its diameter D is hereinafter referred to as the groove diameter D. In addition, the cross-section of the straight body portion 20 and / or the stirring tank 12 when viewed from above can also be any non-circular shape. In this case, the groove diameter D of the stirring tank 12 can be the diameter of the inscribed circle of the cross-sectional shape, or the diameter of the circumscribed circle of the cross-sectional shape, or the average value or intermediate value of the above two. At least a portion of the top of the straight body portion 20 is opened so that the fluid of the stirring object can be put in, and it can be closed by a cover or the like during the process of stirring the fluid using the stirring device 10. In addition, the fluid of the stirring object can be supplied to the stirring tank 12 from a fluid supply port such as a supply nozzle provided on the side of the straight body portion 20.

[0026] The flow blade 14, the shear blade 16 and the frame blade 18 are driven by a drive unit such as a motor or a reducer provided outside the stirring tank 12 so as to move in a vertical direction ( Figure 1 In addition, the flow blade rotation axis 34 of the flow blade 14, the shear blade rotation axis 46 of the shear blade 16, and the frame blade rotation axis 52 of the frame blade 18 may not be the same. Figure 1 The flow blades 14, the shear blades 16 and the frame blades 18 can be arranged on the same straight line as in the example of FIG. 1 , and their directions can be different from each other. The rotation directions or rotation speeds of the flow blades 14, the shear blades 16 and the frame blades 18 can be set or controlled independently of each other, and can be appropriately set or controlled based on various conditions such as the capacity or shape of the stirring tank 12, the properties of the fluid in the stirring tank 12, and the speed or stages of the chemical reaction that should occur in the stirring tank 12.

[0027] Typically, the rotation speed of the shearing wing 16 responsible for shearing or miniaturizing the fluid itself, the microparticles in the fluid, its agglomerates, etc. is greater than the rotation speed of the flow wing 14 and / or the frame wing 18 responsible for the flow of the fluid. For example, when the capacity of the stirring tank 12 is about 10 (l), the typical rotation speed of the flow wing 14 is 20-30 (rpm), and in contrast, the rotation speed of the shearing wing 16 is preferably about 1200 (rpm). In addition, when the capacity of the stirring tank 12 is about 1000 (l), the typical rotation speed of the flow wing 14 is 20-30 (rpm), and in contrast, the rotation speed of the shearing wing 16 is preferably 600-900 (rpm). In this way, the rotation speed of the shearing wing 16 is preferably at least 20 times the rotation speed of the flow wing 14. In addition, in order for the small-diameter dispersion wing in patent document 1 to have the same shearing performance as the large-diameter shearing wing 16 in this embodiment, a rotation speed of about 3600 (rpm) is required. As described later, since the shearing blades 16 having a larger diameter can reduce the rotation speed for obtaining the desired shearing performance or particle size reduction performance, a low-power shearing blade drive unit 47 can be adopted, thereby making the stirring device 10 smaller in size or at a lower cost.

[0028] The flow blade rotation shaft 34 of the flow blade 14 is formed in a cylindrical or tubular shape, and the frame blade rotation shaft 52 of the frame blade 18 is inserted therein. The flow blade rotation shaft 34 of the flow blade 14 and the frame blade rotation shaft 52 of the frame blade 18 extend from the top 24 of the agitation tank 12 into the agitation tank 12. The flow blade rotation shaft 34 is provided at Figure 1 The flow blade driving unit (not shown) above the frame blade rotating shaft 52 is provided at Figure 1 The frame-type blade drive unit (not shown) above the flow blade is driven to rotate from inside the flow blade rotation shaft 34. The flow blade drive unit and the frame-type blade drive unit are preferably composed of different motors, but are preferably integrally configured as one drive unit including the plurality of motors.

[0029] The shear blade rotation shaft 46 of the shear blade 16 as the stirring blade extends from the bottom 22 of the stirring tank 12 into the stirring tank 12. The shear blade rotation shaft 46 is provided at Figure 1 The shearing blade drive unit 47 below is rotationally driven. The drive unit below the agitation tank 12 constituting the shearing blade drive unit 47 is different from the drive unit above the agitation tank 12 constituting the above-mentioned flow blade drive unit and / or frame blade drive unit.

[0030] The flow wing 14 is driven by the flow wing driving unit to rotate around the flow wing rotation shaft 34, so that the fluid flows in the stirring tank 12. The flow wing 14 of the illustrated example is a pair of spiral wings formed in a spiral shape around the flow wing rotation shaft 34 extending in the vertical direction. In addition, the shape of the flow wing 14 is not limited to a spiral or spiral shape, but in order to fully ensure the space for setting the shear wing 16 described later in the area facing the bottom 22 of the stirring tank 12, it is preferably set to a shape with less part close to the bottom 22. Therefore, compared with the anchor-type wing having a shape along the bottom 22, the spiral wing of the illustrated example is preferred.

[0031] In addition, the spiral blades of the illustrated example face the bottom 22 at a position close to the side wall 12a of the stirring tank 12, but as described later, the shearing blades 16 are provided in the central area of ​​the stirring tank 12 in the radial direction (the area centered on the rotation axis such as the shearing blade rotation axis 46), so the flow blades 14 (spiral blades) do not interfere with the shearing blades 16 (stirring blades). The fluid to be stirred will settle at the bottom 22 of the stirring tank 12, and a discharge port for discharging the stirred fluid is usually provided at the bottom 22 of the stirring tank 12, requiring a delicate balance between the flow by the flow blades 14 and the shearing (stirring) by the shearing blades 16. As shown in the illustrated example, by setting the structure of "rotating the flow blades 14 in the outer peripheral area of ​​the bottom 22 and rotating the shearing blades 16 in the central area of ​​the bottom 22", the quality of the stirred fluid in the bottom 22 can be improved. In addition, since the flow blades 14 are only present in the outer peripheral area of ​​the bottom 22, the shearing blades 16 in the central area of ​​the bottom 22 can be enlarged in diameter.

[0032] When the flow blade 14 is driven by the flow blade driving unit to rotate integrally with the flow blade rotating shaft 34, an induced flow is formed that flows downward along the side wall 12a of the straight body portion 20. The fluid in the stirring tank 12 moves to the bottom 22 along the induced flow, and is guided from the peripheral area to the central area where the shearing blade 16 is located, thereby effectively shearing or stirring.

[0033] The flow blade 14 includes: a plurality of strip-shaped ( Figure 1 and at the upper end and lower end of each flow wing body 26 and the inner peripheral portion of each engaging with a plurality of ( Figure 1 In the example of FIG. 2, two support rods 28 are provided. The plurality of flow blade bodies 26 and the plurality of support rods 28 are integrated by welding or the like in a state of being combined as shown in the figure. Each support rod 28 is a rod-shaped member extending in the axial direction, and the upper end and the lower end of each flow blade body 26 are engaged with each support rod 28 to be supported.

[0034] In the case where two support rods 28 and two flow wing bodies 26 are provided Figure 1In the example, the upper end of the upper wing 36 of the first flow wing body 26 is engaged with the upper part of the first support rod 28, and the lower end of the lower wing 38 of the second flow wing body 26 is engaged with the lower part. Similarly, the upper end of the upper wing 36 of the second flow wing body 26 is engaged with the upper part of the second support rod 28, and the lower end of the lower wing 38 of the first flow wing body 26 is engaged with the lower part. In this way, the flow wing bodies 26 engaged with each support rod 28 above and below are different. In other words, a plurality of different flow wing bodies 26 are engaged with each support rod 28, and each flow wing body 26 is engaged with a plurality of different support rods 28.

[0035] Alternatively, you can also use Figure 1 The two support rods 28 shown are further provided with other (for example, two) support rods 28 at the middle position between the two support rods 28 on the same circumference. Figure 1 The two support rods 28 on the front and back sides of the paper support or guide the axial center of each flow wing body 26 shown by O from the inside, so that each flow wing body 26 is maintained in a desired spiral shape. The upper end of each support rod 28 is connected to a flow wing rotation shaft 34 extending in the vertical direction. If the flow wing driving unit (not shown) drives the flow wing rotation shaft 34 to rotate, the flow wing 14 composed of the support rods 28 and the flow wing body 26 connected to each other rotates integrally, thereby forming the above-mentioned induced flow flowing downward.

[0036] The two flow wing bodies 26 formed in a spiral belt shape as a whole are formed to be symmetrical with the flow wing rotation axis 34 as the center point when viewed from above. Each flow wing body 26 is formed to be rotated 180 degrees with the flow wing rotation axis 34 as the center when viewed from above. Therefore, as described above, the upper end of each flow wing body 26 is engaged with one support rod 28, and the lower end of each flow wing body 26 is engaged with the other support rod 28 located at a position (rotated position of 180 degrees) with respect to the flow wing rotation axis 34 when viewed from above.

[0037] An auxiliary wing or an inner wing (i.e., a frame wing 18) having a smaller diameter than the flow wing 14 is provided on the central side or the inner side of the flow wing 14 in the radial direction. The frame wing 18 is driven by the frame wing driving unit and operates around the frame wing rotating shaft 52, and causes the fluid to flow in the stirring tank 12 in a manner different from that of the flow wing 14 on the inner side of the flow wing 14. In addition, since the shear wing 16 described later is provided below the frame wing 18, the axial distance between the bottom 22 of the stirring tank 12 and the frame wing 18 (the lower side part 48D described later) is greater than the installation space or installation height of the shear wing 16. In other words, the space below the frame wing 18 can be utilized to the maximum extent by the shear wing 16.

[0038] The frame wing 18 has: a frame wing body 48 of a rectangular frame shape that is line-symmetrical with respect to a rotation axis (frame wing rotation axis 52) extending in the vertical direction; and a frame wing rotation axis 52 extending in the axial direction that is connected to the upper part of the frame wing body 48 and is rotationally driven by a frame wing driving unit (not shown). The frame wing body 48 has a rectangular frame structure in which an upper part 48U extending in the radial direction, a left part 48L extending in the axial direction, a right part 48R extending in the axial direction, and a lower part 48D extending in the radial direction, which are formed in a rod-like or columnar shape, are integrated. The rotation direction or rotation speed of the frame wing 18 is arbitrary, but typically, the frame wing 18 rotates in the opposite direction to the flow wing 14, or rotates in the same direction as the flow wing 14 at a different speed or rotation speed.

[0039] By rotating the flow blade 14 and the frame blade 18 in different directions and / or at different speeds, a difference is generated between the moving speed of the stirring object accompanying the rotation of the flow blade 14 and the moving speed of the stirring object accompanying the rotation of the frame blade 18. Therefore, the "co-rotation" of the stirring object in the stirring tank 12 rotating together with the flow blade 14 can be suppressed, and the stirring object can be effectively flowed in the stirring tank 12. In addition, by appropriately setting the rotation direction and / or rotation speed of the frame blade 18, a flow can be generated that causes the stirring object sheared by the shearing blade 16 below the frame blade 18 to flow upward. In this way, the induced flow flowing upward in the central part of the stirring tank 12 generated by the frame blade 18 is changed by the flow blade 14 to an induced flow flowing downward along the side wall 12a of the stirring tank 12, and flows to the shearing blade 16 again. In this way, a flow circulating between the flow blade 14, the shearing blade 16 and the frame blade 18 is formed, so that the stirring object can be effectively stirred.

[0040] The stirring blade (i.e., shearing blade 16) disposed between the bottom 22 of the stirring tank 12 and the flow blade 14 is driven by the shearing blade driving unit 47 to rotate around the shearing blade rotating shaft 46, thereby shearing or stirring the fluid in the stirring tank 12. The shearing blade 16 includes a pair of blade portions 17A and 17B (hereinafter collectively referred to as the blade portion 17) extending radially from the shearing blade rotating shaft 46 toward the side wall 12a of the stirring tank 12.

[0041] In the radial direction (left-right direction), the wing portion 17 is arranged in the central area closer to the center or the inner side than the lower end of the flow wing 14 rotating in the outer peripheral area of ​​the stirring tank 12 or the bottom 22. Therefore, at least a part (lower end) of the flow wing 14 is at the end ( Figure 1The left end and the right end in the agitation tank 12 rotate between the side wall 12a of the agitation tank 12 in a manner that does not interfere with the wing portion 17. In addition, in the axial direction (up and down direction), the wing portion 17 is arranged between the frame wing 18 above and the bottom 22 of the agitation tank 12 below. That is, the wing portion 17 is arranged in the central area facing the bottom 22 of the agitation tank 12. As described above, since the bottom 22 of the agitation tank 12 in the present embodiment is planar, the shearing wing 16 having the wing portion 17 extending radially approximately parallel thereto can be effectively or compactly arranged in a roughly rectangular area surrounded by the frame wing 18 above, the flow wing 14 (lower end) in the left and right direction, and the bottom 22 of the agitation tank 12 below.

[0042] Figure 2 is a perspective view of the shearing wing 16 when viewed roughly from the side, Figure 3 16 is a top view or a bottom view of the shearing wing 16. The shearing wing 16 has an axial direction ( Figure 2 The cylindrical hub 161 is in the height direction (in the vertical direction) and the hub 161 is in the radial direction ( Figure 2 and Figure 3 A pair of wings 17A and 17B (wing 17) extending in the left and right directions in the hub 161 are provided at the radial center of the hub 161 with an axially extending mounting hole 46A for inserting and mounting the shear wing rotating shaft 46. Figure 3 As shown, the mounting hole 46A is provided at the center of the recess 46B having a substantially rectangular or substantially square cross section. When the recess 46B is provided on the lower surface of the hub 161, the protrusion 46C ( Figure 4 ) is arranged at the upper end of the roughly cylindrical shear wing rotating shaft 46. When viewed from above, the cross-sectional shape of the convex portion 46C is roughly rectangular or roughly square, and is a shape that is completely the same as the cross-sectional shape of the concave portion 46B or a slightly smaller similar shape. In addition, when viewed from above, a mounting hole 46D that is connected to the mounting hole 46A of the hub 161 is provided in the center of the convex portion 46C. When the convex portion 46C on the upper part of the shear wing rotating shaft 46 is inserted into the concave portion 46B on the lower part of the hub 161, the shear wing rotating shaft 46 and the shear wing 16 (hub 161) are fixed by screws (not shown) fastened to the mounting holes 46A and 46D. Therefore, the shear wing rotating shaft 46 and the shear wing 16 can rotate as a whole.

[0043] The wing 17 is fixed to the hub 161 by welding, for example. Alternatively, the wing 17 may be fixed to the shearing wing rotating shaft 46 by welding or the like without passing through the hub 161. The normal direction of the stirring surface (front surface) of each flat wing 17A, 17B is relative to the axial direction ( Figure 2The vertical direction in the stirring tank 12) and the rotation direction of each wing 17A, 17B (the rotation direction centered on the shear wing rotation shaft 46) are all inclined. Sometimes the stirring wing or shear wing with such a wing 17 is called an inclined stirring wing (Paddle Blades). For example, the angle between the normal direction of the stirring surface of each wing 17A, 17B and the axial direction of the shear wing rotation shaft 46 is preferably less than 15 degrees (the angle with the rotation direction of each wing 17A, 17B is more than 75 degrees). As a result, the stirring surface of each wing 17A, 17B becomes approximately parallel to the bottom 22 of the stirring tank 12 (forming an angle of less than 15 degrees), so the resistance of the stirring surface in rotation from the fluid is reduced. Therefore, even if the wing 17 is enlarged in diameter, it can be driven with relatively low power, which can prevent the shear wing drive unit 47 from being enlarged or costly. Furthermore, as described above, by inclining the wing portion 17, even in the case of a fluid with high thixotropy or a fluid with low drag, the wing portion 17 is less likely to rotate idly, thereby improving the shearing efficiency and the micronizing efficiency.

[0044] Since the load power of the non-disc-shaped shear wing 16 or wing portion 17 is relatively small, the wing diameter can be increased, and since the weight is light, it is easy to maintain rotational balance. Figure 2 and Figure 3 The radial distance between the left end of the wing 17A and the right end of the wing 17B is set to between 35% and 85% of the groove diameter D of the stirring tank 12, preferably between 45% and 75%, and more preferably between 50% and 70%. Therefore, compared with the conventional disc-shaped stirring wing, the shearing area can be increased, and the shearing efficiency or the miniaturization efficiency is improved.

[0045] Furthermore, in conventional disc-shaped stirring wings (e.g., the dispersion wings of Patent Document 1), the stirring tank is divided into upper and lower parts by the disc portion, which greatly hinders the flow of the fluid. As a result, particularly high-viscosity solutions are easily stored on the lower side of the disc portion. In contrast, according to the present embodiment, by utilizing a non-disc-shaped shearing wing 16 having a wing portion 17 extending from the shearing wing rotating shaft 46 toward the side wall 12a of the stirring tank 12, the stirring tank 12 is not divided into upper and lower parts as in conventional disc-shaped stirring wings. Therefore, even if the wing diameter of the wing portion 17 of the shearing wing 16 is increased, the flow of the fluid based on the flow wing 14 or the frame wing 18 will not be hindered too much. In this way, the flow generated by the flow wing 14 or the frame wing 18 easily reaches the shearing wing 16, which can be larger in diameter than before, so even a fluid with high viscosity can be effectively sheared or stirred.

[0046] Thus, the shearing wing 16 or the stirring device 10 of the present embodiment as a whole is suitable for shearing or miniaturizing a fluid with a relatively high viscosity (a fluid with a viscosity of at least 1000 cP or more, for example, a fluid with a viscosity of 10000 cP or more). As such a high-viscosity fluid, any fluid (oil, varnish, rubber, polymer solution, molten resin, etc.) containing microparticles such as carbon black or silicon dioxide can be exemplified. Microparticles such as carbon black form aggregates in the fluid, but are effectively miniaturized and / or dispersed by the shearing wing 16 of the present embodiment.

[0047] In order to obtain suitable shearing performance or micronizing performance for such a high-viscosity fluid, the width w ( Figure 3 ) is preferably set to be less than 5% of the groove diameter D of the stirring tank 12. In order to obtain the desired stirring performance at the bottom 22 of the stirring tank 12 where the fluid to be stirred is often settled and a discharge port for discharging the stirred fluid is provided, the distance h ( Figure 1 ) is preferably set to be less than 15% of the groove diameter D of the stirring tank 12.

[0048] The present invention has been described above based on the embodiments. It is obvious to those skilled in the art that various modifications may exist in the combinations of the constituent elements or processes in the exemplified embodiments, and such modifications are also included in the scope of the present invention.

[0049] For example, the shape of the stirring blade of the present invention is not limited to the shape of the shearing blade 16 illustrated in the embodiment. In order to obtain at least a part of the effect of the present invention, the stirring blade provided between the bottom of the stirring tank and the flow blade can be a non-disc shape having one or more blade portions extending from the rotation axis toward the side wall of the stirring tank.

[0050] In addition, the structure, role and function of each device or method described in the embodiments can be realized by hardware resources or software resources, or the cooperation of hardware resources and software resources. As hardware resources, for example, processors, ROM, RAM, and various integrated circuits can be used. As software resources, for example, programs such as operating systems and applications can be used.

[0051] Industrial Applicability

[0052] The present invention relates to a stirring device and the like.

[0053] Explanation of symbols

[0054] 10-stirring device, 12-stirring tank, 12a-side wall, 14-flow wing, 16-shearing wing, 17-wing portion, 18-frame wing, 20-straight body portion, 21-flange portion, 22-bottom, 34-flow wing rotation axis, 46-shearing wing rotation axis, 47-shearing wing driving portion, 52-frame wing rotation axis.

Claims

1. A stirring device, characterized in that: have: A stirring tank, containing a fluid; A flow wing, which rotates to make the fluid flow in the stirring tank; and The stirring blade is provided between the bottom of the stirring tank and the flow blade, stirs the fluid by rotating, and includes a blade portion extending from the rotation axis toward the side wall of the stirring tank.

2. The stirring device according to claim 1, characterized in that: At least a portion of the flow blade rotates between a tip end portion of the blade and a side wall of the stirring tank.

3. The stirring device according to claim 1 or 2, characterized in that: The normal direction of the stirring surface of the blade is inclined with respect to both the axial direction of the rotating shaft and the rotation direction of the blade.

4. The stirring device according to claim 3, characterized in that: The angle between the normal direction of the stirring surface of the wing and the axial direction is less than 15 degrees.

5. The stirring device according to claim 1 or 2, characterized in that: The wing diameter in the extension direction of the wing portion is between 50% and 70% of the tank diameter of the stirring tank.

6. The stirring device according to claim 1 or 2, characterized in that: The width of the tip end of the wing portion is 5% or less of the diameter of the agitation tank.

7. The stirring device according to claim 1 or 2, characterized in that: The distance between the wing portion and the bottom of the agitation tank is less than or equal to 15% of the tank diameter of the agitation tank.

8. The stirring device according to claim 1 or 2, characterized in that: The bottom of the stirring tank is flat.

9. The stirring device according to claim 8, characterized in that: The planar bottom of the agitation tank can be mounted on a flange formed on the bottom of the cylindrical side wall of the agitation tank.

10. The stirring device according to claim 1 or 2, characterized in that: The rotation axis of the stirring wing extends from the bottom of the stirring tank toward the inside of the stirring tank.

11. The stirring device according to claim 1 or 2, characterized in that: The rotation axis of the flow wing extends from the top of the stirring tank toward the inside of the stirring tank.

12. The stirring device according to claim 1 or 2, characterized in that: The rotation speed of the stirring wing is greater than the rotation speed of the flowing wing.

13. The stirring device according to claim 1 or 2, characterized in that: The rotation axis of the stirring blade and the rotation axis of the flow blade are arranged on substantially the same straight line.

14. A stirring method, characterized in that: The following steps are required: rotating the flow blades to cause the fluid to flow in the stirring tank; and The fluid is stirred by rotating a stirring blade having a blade portion disposed between the bottom of the stirring tank and the flow blade at a higher speed than the flow blade, wherein the blade portion extends from a rotation axis of the stirring blade toward a side wall of the stirring tank.

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