Stirring device and stirring jig used for same
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2026-02-06
- Publication Date
- 2026-08-13
Smart Images
Figure JP2026004482_13082026_PF_FP_ABST
Abstract
Description
Stirring device and stirring tool used therefor
[0001] The present invention relates to a stirring device used for stirring a slurry containing sedimentable particles, and particularly to a water flow circulation type stirring device and a stirring tool used therefor.
[0002] When stirring a slurry containing sedimentable particles using a stirring device of the type in which blades rotate, at the start of stirring, since the sedimentable particles have settled to the bottom of the container and are deposited in a cake shape, a large amount of torque is required to rotate the blades, and in some cases, there is a problem that stirring cannot be performed.
[0003] In response to such a problem, for example, a method of forcibly rotating the blades using a driving device having sufficient torque to disperse the sedimentable particles deposited in the above-mentioned cake shape can be considered. However, in this method, there is a concern that a large load is applied to the blades and the shaft for rotating the blades at the initial stage of stirring. Further, in this method, since the shaft for rotating the blades is connected to a driving device provided outside the container, particularly in an aspect where it is necessary to use a sealed container, such as when performing a dispersion treatment of sedimentable particles under pressure, its implementation has been difficult.
[0004] Further, Patent Document 1 discloses an invention related to a stirring rotor and a stirring device for stirring and mixing liquids and other various fluids under the name of "Stirring Rotor and Stirring Device". The stirring rotor disclosed in Patent Document 1 includes a substantially hemispherical main body provided with a plurality of suction ports and discharge ports on its surface, and a drive shaft erected perpendicular to the bottom surface of the main body. A flow passage is formed inside the main body so as to connect the discharge port and the suction port, and the discharge port is provided radially outside the suction port.
[0005] Japanese Patent No. 4418019
[0006] When attempting to agitate a slurry containing settling particles using the invention disclosed in Patent Document 1, although the agitator has no blades and can start rotating with a small driving force from a state where settling particles have accumulated, there is a problem in that the intake port is located in the low-flowability slurry (cake) where the settling particles have accumulated, making it impossible to sufficiently suck up the slurry and thus preventing the start of agitation by the water flow from the discharge port.
[0007] The present invention addresses these conventional circumstances and aims to provide a stirring jig and a stirring device equipped therewith that can solve the above-mentioned problems that occur when using a stirring jig consisting of the above-mentioned rotating stirring body to stir a slurry containing settling particles.
[0008] To achieve the above objective, the stirring jig according to the first invention comprises a shaft extending vertically, and a stirring body provided continuously at the lower end of the shaft such that its centerline coincides with the central axis of the shaft, and having a circular cross-section perpendicular to the centerline with a larger diameter than the shaft. The shaft has an intake port provided on its side, a first opening provided at its lower end, and a first flow path connecting the intake port and the first opening. The stirring body is provided on its upper surface and has a second opening communicating with the first opening, one or more first discharge ports provided on its outer circumferential surface, and a second flow path connecting the second opening and the first discharge port. The shape of the stirring body is not particularly limited as long as there is a portion where the cross-section perpendicular to the centerline has a circular cross-section with a larger diameter than the shaft, and shapes such as cylindrical, lower hemispherical, and inverted conical shapes can be adopted. Of these, the cylindrical shape is preferred due to its ease of processing. The discharge ports are formed on the outer circumferential surface, which is spaced outward from the shaft. Specifically, if the stirring body is cylindrical, the particles can be formed on the circumferential surface, bottom surface, or edge, away from the shaft in the outer direction. If it is hemispherical or inverted cone-shaped, the particles can be formed at any point on the outer surface, away from the shaft in the outer direction.
[0009] The second invention is characterized in that, in the first invention, the upper surface of the stirring body is frustoconical in shape, tapering upwards. If the upper surface of the stirring body is flat, the invention may be implemented by providing a frustoconical guide member, which is installed on the upper surface of the stirring body so as to taper away from the stirring body, with a shaft inserted into a through hole provided in the center, as will be described in the embodiments for carrying out the invention described later.
[0010] The third invention is characterized in that, in the first invention, one intermediate flow path section is provided in the middle of the second flow path, the contour of the cross-section of the intermediate flow path section formed by a plane perpendicular to the center line is polygonal, the portion of the second flow path upstream of the intermediate flow path section is composed of one flow path, which opens on the upper surface of the central region of the intermediate flow path section and connects to a first opening provided at the lower end of the shaft body, and the portion of the second flow path downstream of the intermediate flow path section is composed of multiple flow paths, which each open at locations corresponding to the corners of the polygon in the intermediate flow path section and are connected to a first discharge port.
[0011] The fourth invention is characterized in that, in the third invention, the stirring body is cylindrical in shape, has a first discharge port provided on the outer surface which is the outer surface, and comprises a plurality of second discharge ports provided on the lower surface, and a plurality of third flow channels connecting each of the second discharge ports to the intermediate flow channel, and the upstream end of each third flow channel is open at a location corresponding to a polygonal corner with respect to the intermediate flow channel.
[0012] The stirring device according to the fifth invention is characterized by comprising a container for housing a stirring jig according to any of the first to fourth inventions, and a driving means for rotating the stirring jig about a center line.
[0013] The sixth invention is characterized in that, in the fifth invention, the container is sealed, the shaft of the stirring jig is rotatably supported by a support member provided in the upper part of the container, a shaft portion is provided on the lower surface of the stirring body constituting the stirring jig so as to extend downward, and the tip of the shaft portion is rotatably supported by a bearing portion provided in the bottom of the container. It is preferable that the shaft portion be conical.
[0014] The seventh invention is characterized in that, in the fifth invention, the driving means comprises a permanent magnet installed as a rotor on the upper part of the shaft, and a stator installed outside the container that generates a rotating magnetic field for rotating the rotor about a central line.
[0015] The eighth invention is characterized in that, in the fifth invention, the driving means consists of a magnet for the stirring body embedded in the stirring body and a rotating magnetic field generating unit installed below the container, and the magnet for the stirring body is configured to rotate together with the stirring body about a center line due to the action of the rotating magnetic field generated by the rotating magnetic field generating unit.
[0016] In the first invention, the stirring body constituting the stirring jig has a centerline, and the cross-section perpendicular to this centerline is circular, resulting in low resistance when the stirring body rotates. Therefore, in the first invention, even if the settling particles have settled at the bottom of the container and accumulated in a cake-like manner at the start of stirring of a slurry containing settling particles, rotation can be easily started with little force. Furthermore, the stirring body has a portion of its cross-section that is larger in diameter than the shaft, and the discharge port is located radially outward from the intake port (shaft). As a result, the centrifugal force accompanying the rotation of the stirring body generates a flow of liquid toward the discharge port, drawing liquid in from the intake port and discharging it from the discharge port. In the first invention, the intake port is provided on the side of the shaft, allowing liquid to be drawn into the shaft from the upper liquid layer where relatively clear liquid exists, thus preventing the flow path to the intake port and discharge port from becoming clogged with cake. Therefore, according to the first invention, since a liquid with a low concentration of settling particles is discharged from the first discharge port, the cake present in the surrounding area is effectively broken up, making it extremely easy to start stirring the slurry containing settling particles, and a uniform slurry in which the settling particles are redispersed can be obtained.
[0017] According to the second invention, in addition to the effects of the first invention, when used to stir a slurry containing settling particles, the inclined portion on the upper surface of the stirring body prevents the accumulation of settling particles on the upper part of the stirring body.
[0018] In the third invention, in the intermediate flow channel of the agitator, the liquid flowing into the agitator from the upstream flow channel through the inside of the shaft is concentrated by the centrifugal force caused by the rotation of the agitator, flowing along the inner walls that make up each side of the rectangle towards the corners of the rectangle. This makes it easier for the liquid to flow into the downstream portion that opens at these points, thus promoting the discharge of liquid from the first discharge port. As a result, the cake is more effectively broken up and redispersed at the start of stirring, and the suction of liquid from the suction port becomes even smoother. Therefore, according to the third invention, the effect of the first invention, which is to efficiently stir a slurry containing settling particles, is further enhanced.
[0019] In the fourth invention, in the configuration of the third invention, a cylindrical stirring body is adopted and the first discharge port is provided on the outer surface of the stirring body, thereby promoting the discharge of liquid from the second discharge port directed downwards from the stirring body. As a result, an effect is added to dissolve the cake-like deposits accumulated below the stirring body, making it possible to redisperse the cake-like deposits of settling particles at the start of stirring and to ensure thorough stirring of the slurry containing the settling particles.
[0020] The stirring device according to the fifth invention provides the same effects as any of the first to fourth inventions.
[0021] In the sixth invention, the stirring jig is rotatably supported by a support member provided inside a sealed container, and since there is no rotating shaft penetrating the container, the problem of liquid leakage does not occur even when stirring under high temperature and pressure, and it can be used safely.
[0022] According to the seventh invention, a driving means capable of rotating the stirring jig with sufficient driving force can be provided. Furthermore, since it can be realized with a simple structure, in addition to the effects of the fifth invention, it also has the effect of reducing manufacturing costs.
[0023] According to the eighth invention, since the rotating magnetic field generated by a rotating magnetic field generator installed below the container acts on the magnet for the stirring body, causing the stirring body to rotate, in addition to the effects of the fifth invention, it is possible to miniaturize the driving means for rotating the stirring body.
[0024] (a) is a front view showing an example of the external appearance of a stirring jig according to an embodiment of the present invention, and (b) is a cross-sectional view taken along the line A-A in Figure (a). (a) is an enlarged view of the portion enclosed by the dashed line in Figure 1(b), and (b) is a cross-sectional view taken along the line B-B in Figure 1(a). This is a front view showing an example of the external appearance of a stirring device according to an embodiment of the present invention. This is a cross-sectional view taken along the line C-C in Figure 3. This is a cross-sectional view taken along the line D-D in Figure 3. (a) is a diagram showing a modified example of Figure 2(a), and (b) is a cross-sectional view taken along the line E-E in Figure (a). (a) is a front view showing the external appearance of a modified example of the stirring device shown in Figure 3, and (b) is a cross-sectional view taken along the line F-F in Figure (a).
[0025] The configuration of the stirring device and stirring jig used therein, as well as the operation and effects of the invention, will be specifically explained with reference to Figures 1 to 7. Note that in Figures 3 to 5 and Figure 7, the cables and other components connected to the stirring device are omitted from the illustration. Also, in Figure 3, the driving means is shown with a dashed line. Furthermore, in the following description, expressions such as "top surface" and "bottom surface," or "upper end" and "lower end," are used assuming the stirring jig and stirring device are actually used.
[0026] As shown in Figures 1(a) and 1(b), the stirring jig 1 according to an embodiment of the present invention comprises a shaft 2 extending vertically, a cylindrical stirring body 3 with a larger diameter than the shaft 2, a frustoconical guide member 4 installed on the upper surface 3a of the stirring body 3 so as to taper toward the direction away from the stirring body 3 and into which the shaft 2 is inserted, and a conical shaft portion 5 provided on the lower surface 3b of the stirring body 3 so as to extend downward. The shaft 2 has a first opening 2c that opens downward at its lower end 2a, three intake ports 2d that open to the side and are provided in the approximately central part of the side surface 2b in the vertical direction, and a first flow path 2e that extends vertically connecting the intake ports 2d and the first opening 2c, and the stirring body 3 is provided continuously at the lower end 2a so as to coincide with the central axis 2f and the center line L. Each intake port 2d is arranged, for example, in a staggered pattern along the central axis 2f in the approximately central part of the shaft 2 in the vertical direction. The opening position of the intake ports 2d does not need to be below the liquid level of the slurry contained inside the container 11 of the stirring device 10, which will be described later. Specifically, it does not have to be in the approximately central part of the shaft 2 in the vertical direction, but it is preferable to be at a position away from the stirring body 3. In the figure, the stirring body 3 is cylindrical in shape and includes a second opening 3d that opens upward and is located at the center of the upper surface 3a so as to communicate with the first opening 2c of the shaft 2, a first discharge port 3e that opens to the side and is located approximately in the center of the circumferential surface 3c in the vertical direction, four second discharge ports 3f that are located at an intermediate position between the center of the lower surface 3b and the outer edge and are equally spaced around the center line L, four third flow paths 3h that are connected to each of the four second discharge ports 3f, and a second flow path 3g that connects the second opening 3d and the first discharge port 3e.
[0027] As shown in Figures 2(a) and 2(b), the agitator 3 consists of a second flow path 3g with an upstream flow path section 6, an intermediate flow path section 7 whose cross-sectional area, drawn from a plane perpendicular to the centerline L, has a rectangular shape, and four downstream flow path sections 8. Specifically, one intermediate flow path section 7 is provided in the middle of the second flow path 3g, and the portion of the second flow path 3g upstream of the intermediate flow path section 7 is composed of a single flow path and opens to the upper surface of the central region of the intermediate flow path section 7. Furthermore, the upstream end 9a of each downstream flow path section 8 opens at a location corresponding to the corner of a rectangle relative to the intermediate flow path section 7. In other words, the portion of the second flow path 3g downstream of the intermediate flow path section 7 is composed of multiple flow paths, each opening at a location corresponding to the corner of a polygon in the intermediate flow path section 7. Note that the intermediate flow path section 7 is not limited to a structure in which the cross-sectional area, drawn from a plane perpendicular to the centerline L, has a rectangular shape, but may also have a polygonal shape. The third flow path 3h extends vertically and is formed to connect each of the second discharge ports 3f to the intermediate flow path section 7. Its upstream end 9b opens at a location corresponding to a rectangular corner relative to the intermediate flow path section 7. Although there are four downstream flow path sections 8 and four third flow paths 3h, the number is not limited to four; there may be one to three of each, or five or more.
[0028] As shown in Figures 3 and 4, the stirring device 10 according to an embodiment of the present invention comprises a bottomed cylindrical container 11 that extends straight up and down and has an upper end opening 11a, an upper bearing portion 12 attached above it, a lower bearing portion 13 provided at the point where the tip 5a of the shaft portion 5 contacts the bottom 11b of the container 11, and a driving means 14a for rotating the stirring body 3 around the center line L, with the stirring jig 1 housed inside the container 11. The upper bearing portion 12 has a bearing 12a for holding the upper end 2g of the shaft 2 and functions as a support member that rotatably supports the shaft 2. Furthermore, since a flange 11c is provided at the upper end opening 11a of the container 11, the container 11 can be sealed by attaching the flange 20a of the lid portion 20 to this flange 11c and closing the upper end opening 11a with the lid portion 20. In Figures 3 and 4, the opening of the container 11 and the mounting position of the flange 11c are shown as being at the top of the container 11. However, these positions are not particularly limited and may be at the bottom of the container 11, or at both the top and bottom of the container 11. Although not shown, the container 11 may also be equipped with piping for supplying and / or discharging slurry, a slurry pressurizing device, or a slurry heating device as needed.
[0029] The driving means 14a will be explained using Figure 5, which is a cross-sectional view taken along the line D-D in Figure 3. Note that in Figure 5, reference numerals are only used for some of the permanent magnets and coils to avoid making the diagram too complex. As shown in Figure 5, the driving means 14a consists of a plurality of permanent magnets 17 embedded as a rotor 16 in a cylinder 15 attached to the upper part of the shaft 2 via a rib 21, and a stator 19 consisting of a plurality of coils 18 placed on a disc 19a attached to the outside of the container 11 and generating a rotating magnetic field for rotating the rotor 16 around the center line L.
[0030] The driving means for rotating the stirring jig 1 in the stirring device 10 is not limited to the driving means 14a shown in Figure 5. For example, as shown in Figures 7(a) and 7(b), a driving means 14b consisting of a magnetic stirrer can be used instead of the driving means 14a. The driving means 14b consists of a housing 22 on which the container 11 is installed on its upper surface 22a, a rotating magnetic field generating unit 23 built into the housing 22, and a plurality of magnets 24 for the stirring body embedded in the stirring body 3, for example, four magnets for the stirring body. The plurality of magnets 24 for the stirring body are arranged evenly in the circumferential direction surrounding the shaft portion 5, with the surface 24a of one of the magnetic poles exposed from the lower surface 3b of the stirring body 3.
[0031] The rotating magnetic field generating unit 23 comprises a disc 26 positioned approximately horizontally and rotatable around a rotation axis 25, a motor 27 for rotating the disc 26, and a plurality of drive magnets 28 installed on the upper surface 26a of the disc 26. The stirring body magnet 24 and the drive magnets 28 are installed so that their magnetic poles are opposite each other. In other words, the driving means 14b is structured to rotate the stirring body 3 by applying the rotating magnetic field generated by the rotating magnetic field generating unit 23 to the stirring body magnet 24. With this structure, the rotating magnetic field generating unit 23 for rotating the stirring body 3 is installed below the container 11, and the stirring body magnet 24, which is acted upon by the rotating magnetic field generated by the rotating magnetic field generating unit 23, is embedded in the stirring body 3, making it possible to miniaturize the driving means 14b.
[0032] In the stirring device 10 with the above structure, it is preferable to adjust the length of the shaft 5 so that the distance between the stirring magnet 24 and the driving magnet 28 is as short as possible. Furthermore, it is desirable that the permanent magnets used in the stirring magnet 24 and the driving magnet 28 be rare earth magnets such as neodymium magnets or samarium cobalt magnets, which have strong magnetic force. In particular, if these magnets may be used at high temperatures (for example, 150 degrees Celsius or higher), such as in a hydrothermal reaction, it is preferable to use samarium cobalt magnets.
[0033] When a slurry containing settling particles is stirred using the stirring jig 1 with this structure, at the start of stirring, when the settling particles have accumulated in a cake-like state, the liquid from the upper part of the liquid layer containing relatively clear liquid is drawn into the interior of the shaft 2 through the intake port 2d. As a result, the first flow path 2e connecting the intake port 2d and the first opening 2c does not become clogged. Therefore, as described above, the stirring jig 1 makes it possible to redisperse the cake-like settling particles very easily, thereby obtaining a uniform slurry.
[0034] Furthermore, in the stirring jig 1, when the settling particles have accumulated in a cake-like state at the start of stirring, liquid with a low concentration of settling particles is discharged from the first discharge port 3e and the second discharge port 3f, which breaks up the cake-like accumulation in the surrounding area, thus making the discharge of liquid from the first discharge port 3e and the second discharge port 3f even smoother. This further enhances the effect of efficiently stirring the slurry containing settling particles accumulated at the bottom 11b of the container 11. In addition, in the stirring jig 1, when stirring the slurry containing settling particles, the frustoconical guide member 4 installed on the upper surface 3a of the stirring body 3 acts to prevent the accumulation of settling particles on the upper surface 3a of the stirring body 3.
[0035] Furthermore, in the stirring jig 1, the centrifugal force generated when the stirring body 3 rotates in the intermediate flow channel 7 causes a stronger flow of liquid that flows in from the upstream flow channel 6 and travels along the inner walls 7a (see Figure 2(b)) that make up each side of the rectangle toward the corners of the rectangle. As a result, the liquid flows more easily into the interior of the upstream end 9a of the downstream flow channel 8 and the upstream end 9b of the third flow channel 3h, which are open at these locations, thereby promoting the discharge of liquid from the first discharge port 3e and the second discharge port 3f. Consequently, the suction of liquid from the inlet 2d becomes even smoother, and when used for stirring slurries containing settling particles, the effect of efficiently dissolving cake-like sediments at the start of stirring and ensuring reliable stirring of the slurry thereafter is further enhanced.
[0036] As already explained with reference to Figures 3 and 4, the stirring device 10 is equipped with a stirring jig 1, and therefore the same functions and effects as those exhibited by the stirring jig 1 are achieved. Furthermore, in the stirring device 10, the tip 5a of the shaft portion 5 provided on the lower surface 3b of the stirring body 3 is rotatably supported by a lower bearing portion 13 provided on the bottom 11b of the container 11, and the shaft body 2 is rotatably supported by an upper bearing portion 12 provided on the upper part of the container 11. This ensures that the posture of the stirring jig 1 when it rotates is stable, making it less prone to failure. Therefore, the stirring device 10 can be used for a long period of time. Moreover, as already explained with reference to Figure 5, in the stirring device 10, the driving means 14a for rotating the stirring jig 1 can be realized with a simple structure, thus reducing manufacturing costs.
[0037] Furthermore, the stirring body 3 of the stirring jig 1 is not limited to the structure shown in Figures 1, 2, and 3. For example, as shown in Figures 6(a) and 6(b), the stirring body 3 can also be constructed without a second discharge port 3f, a third flow path 3h, and an intermediate flow path section 7 in the second flow path 3g. In this case, the functions and effects of the stirring body 3 are similarly exhibited, excluding the functions and effects exhibited by the second discharge port 3f, the third flow path 3h, and the intermediate flow path section 7 in the second flow path 3g.
[0038] The stirring apparatus and stirring jigs used therein of the present invention can be used for wet surface treatment of inorganic powders with high specific gravity, such as boron nitride powder and natural mineral pulverized materials, and for stirring slurries containing settling particles, such as for impurity removal treatment using solubility differences as described in Japanese Patent Application Publication No. 1-11711.
[0039] 1…Agitation jig 2…Shaft 2a…Lower end 2b…Side 2c…First opening 2d…Inlet 2e…First flow path 2f…Central axis 2g…Upper end 3…Agitator 3a…Upper surface 3b…Lower surface 3c…Circumferential side 3d…Second opening 3e…First discharge port 3f…Second discharge port 3g…Second flow path 3h…Third flow path 4…Guide member 4a…Through hole 5…Shaft portion 5a…Tip 6…Upstream flow path portion 7…Intermediate flow path portion 7a…Inner wall 8…Downstream flow path portion 9a…Upstream end 9b…Upstream end 10…Agitation device 11…Container 11a…Upper end opening 11b…Bottom 11c…Flange 12…Upper bearing portion 12a…Bearing 13…Lower bearing portion 14a…Driving means 14b…Driving means 15...Cylinder 16...Rotor 17...Permanent magnet 18...Coil 19...Stator 19a...Disk 20...Lid 20a...Flange 21...Rib 22...Housing 22a...Top surface 23...Rotating magnetic field generating unit 24...Magnet for stirring body 24a...Surface 25...Rotating shaft 26...Disk 26a...Top surface 27...Motor 28...Drive magnet L...Centerline
Claims
1. The device comprises a shaft (2) extending vertically, and a stirring body (3) provided continuously at the lower end (2a) of the shaft (2) such that its centerline (L) coincides with the central axis (2f) of the shaft (2), and having a circular cross-section perpendicular to the centerline (L) with a larger diameter than the shaft (2), wherein the shaft (2) has an intake port (2d) provided on its side surface (2b), a first opening (2c) provided at its lower end (2a), and a first flow path (2e) connecting the intake port (2d) and the first opening (2c), and the stirring body (3) has a second opening (3d) provided on its upper surface (3a) and communicating with the first opening (2c), and one or more first discharge ports (3e) provided on its outer circumferential surface, A stirring jig (1) is characterized by comprising a second flow path (3g) connecting the second opening (3d) and the first discharge port (3e).
2. The stirring jig (1) according to claim 1, characterized in that the upper surface (3a) of the stirring body (3) is shaped like a frustoconical cone that tapers upward.
3. The stirring jig (1) according to claim 1, characterized in that an intermediate flow path section (7) is provided in the middle of the second flow path (3g), the contour of the cross-section of the intermediate flow path section (7) by a plane perpendicular to the center line (L) is polygonal, the portion of the second flow path (3g) upstream of the intermediate flow path section (7) is composed of a single flow path that opens on the upper surface of the central region of the intermediate flow path section (7) and connects to the first opening (2c) provided at the lower end (2a) of the shaft (2), and the portion of the second flow path (3g) downstream of the intermediate flow path section (7) is composed of multiple flow paths that open at locations corresponding to the corners of the polygon in the intermediate flow path section (7) and connect to the first discharge port (3e).
4. The stirring jig (1) according to claim 3, wherein the stirring body (3) is cylindrical in shape, the first discharge port (3e) is provided on the circumferential surface (3c) which is the outer surface, and the stirring body (3) comprises a plurality of second discharge ports (3f) provided on the lower surface (3b), and a plurality of third flow channels (3h) connecting each of the second discharge ports (3f) to the intermediate flow channel section (7), and the upstream end of each of the third flow channels (3h) is open to the intermediate flow channel section (7) at a location corresponding to the corner of the polygon.
5. A stirring device comprising: a container (11) for housing the stirring jig (1) according to any one of claims 1 to 4; and a driving means (14a) for rotating the stirring jig (1) about the center line (L).
6. The stirring device (1) according to claim 5, characterized in that the container (11) is sealed, the shaft (2) of the stirring jig (1) is rotatably supported by a support member provided in the upper part of the container (1), a shaft portion (5) is provided on the lower surface (3b) of the stirring body (3) constituting the stirring jig (1) so as to extend downward, and the tip of the shaft portion (5) is rotatably supported by a bearing portion provided on the bottom (11b) of the container (11).
7. The stirring device (1) according to claim 5, characterized in that the driving means (14a) comprises a permanent magnet (17) installed as a rotor (16) on the upper part of the shaft (2), and a stator (19) installed outside the container (11) that generates a rotating magnetic field for rotating the rotor (16) about the center line (L).
8. The stirring device (1) according to claim 5, wherein the driving means (14b) comprises a magnet (24) for the stirring body embedded in the stirring body (3) and a rotating magnetic field generating unit (23) installed below the container (11), and the magnet (24) for the stirring body is configured to rotate together with the stirring body (3) about the center line (L) by the action of the rotating magnetic field generated by the rotating magnetic field generating unit (23).