Mixing device

Abstract

To solve a problem that a conventional stirring device, which is configured to make a rotary vane provided in the stirring device float and rotate in non-contact with a stirring container, has a disadvantage that stirring force cannot be enhanced.SOLUTION: A stirring device according to the present invention is constituted of: a stirring container that contains an object to be stirred; a support shaft hung down and fixed in the stirring container; a rotating shaft provided in the support shaft to be rotatable around a shaft; a stirring vane provided in the rotating shaft; one magnet provided in the rotating shaft; and the other magnet, provided outside the stirring container, which is rotated by rotating means, which rotates the one magnet around the shaft. The rotating shaft has a hole with a bottom formed, with a desired length, downward in an axial direction from an upper end face of the rotating shaft. The support shaft is inserted into the hole of the rotating shaft, and the rotating shaft is provided rotatably through a sliding part provided in the hole.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an agitator that uses magnets to rotate rotors (agitating blades) inside an agitating vessel. [Background technology]

[0002] FIG. 4 shows a conventional general stirring device, in which 1 is the stirring device and 2 is the stirring vessel of the stirring device 1. The stirring vessel 2 is, for example, a cylindrical sealed vessel with a bottom, the upper opening of which is closed by a ceiling plate 2a.

[0003] Also, 3 denotes a rotor, which is attached to the lower end of a rotating shaft 4 that extends through the ceiling plate 2a of the stirring vessel 2 and hangs down. The rotating shaft 4 also extends through a sliding part 5, such as a bearing, that is attached to the ceiling plate 2a and is rotatable in a sealed state.

[0004] However, in the field of agitation culture devices, for example, shavings from the sliding part 5 that supports the rotating shaft 4 get into the agitation vessel 2, causing contamination.

[0005] To prevent this contamination, there is a device that does not have any sliding parts, suspends the rotor in the stirring vessel by magnetic force, and rotates the rotor without contacting the stirring vessel (Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2013-13216 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, a device that rotates a rotor by floating it without contacting the stirring vessel has the drawback that it is not possible to increase the stirring force and that it is expensive.

[0008] The present invention is intended to eliminate the above drawbacks. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the stirring device of the present invention comprises a stirring vessel in which the object to be stirred is placed, a support shaft suspended and fixed within the stirring vessel, a rotating shaft attached to the support shaft so as to be freely rotatable around its axis, a stirring blade attached to the rotating shaft, one magnet attached to the rotating shaft, and the other magnet attached outside the stirring vessel and rotated by a rotating means for rotating the one magnet around its axis, wherein the rotating shaft has a bottomed hole formed at a desired length axially downward from the upper end surface of the rotating shaft, and the support shaft is inserted into the hole of the rotating shaft, and the rotating shaft is rotatably attached via a sliding part provided within the hole. [Effects of the Invention]

[0010] According to the present invention, it is possible to prevent chips and the like from the sliding portion from entering the object to be stirred in the stirring vessel. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a longitudinal sectional side view for explaining the stirring device of the present invention. [Figure 2] FIG. 2 is an enlarged view of a main part of the stirring device of the present invention. [Figure 3] FIG. 10 is an explanatory diagram of a main part of another embodiment of the stirring device of the present invention. [Figure 4] FIG. 1 is a longitudinal sectional side view for explaining a conventional stirring device. DETAILED DESCRIPTION OF THE INVENTION

[0012] Examples of modes for carrying out the present invention are shown below. [Example]

[0013] A first embodiment of the present invention will be described with reference to FIGS.

[0014] The stirring device 6 of the present invention comprises a sealed stirring vessel 7 containing a desired amount of a stirred object such as a culture medium, a support shaft 8 suspended and fixed within the stirring vessel 7, a rotating shaft 9 suspended from the support shaft 8 so as to be rotatable about the shaft, a rotor 10 attached to the rotating shaft 9, one magnet (driven magnet) 11 attached to the top of the rotating shaft 9, and the other magnet (driving magnet) 13 attached outside the stirring vessel 7 and rotated by a rotating means 12 that attracts the one magnet 11 upward and rotates it about the shaft.

[0015] The magnets 11 and 13 are a concept that includes all magnetic means such as electromagnets.

[0016] The stirring vessel 7 is, for example, a sealed vessel made up of a cylindrical vessel body 7a with a bottom and a ceiling plate 7b that closes the upper opening of the vessel body 7a in an airtight and liquid-tight manner.

[0017] Furthermore, the ceiling plate 7b is provided with a protruding chamber 14, for example, in which the central part of a flat plate body protrudes upward in a convex shape, and the upper and lower surfaces of the ceiling plate part 14a at the upper end of the protruding chamber part 14 are each formed flat.

[0018] The support shaft 8 is fixed downwardly in the center of the underside of the ceiling plate portion 14a of the protruding chamber portion 14, and its lower end is formed with a pointed portion 8a that is, for example, conical.

[0019] In addition, the rotating shaft 9 has a bottomed hole 15 of a desired length formed extending axially downward from the center of the upper end surface, and a receiving portion 15a is formed in the center of the bottom of the hole 15 to receive the lower end of the pointed portion 8a.

[0020] The support shaft 8 is inserted into the hole 15 of the rotating shaft 9 so as to be movable in the vertical direction, and the rotating shaft 9 is rotatable around its axis relative to the support shaft 8 via a sliding part 16 such as a bearing or sliding material provided in the hole 15.

[0021] Furthermore, the desired length is set to a length that allows the upper end of the rotating shaft 9 to be close to the underside of the ceiling plate portion 14a without contacting it when the rotating shaft 9 is attracted upward by magnetic force and rises until the receiving portion 15a abuts against the pointed portion 8a at the lower end of the rotating shaft 9.

[0022] Furthermore, when the rotating shaft 9 is attracted upward by the other magnet 13, the lower end of the rotating shaft 9 is positioned, for example, above the bottom surface of the stirring vessel 7 and close to the bottom surface, and the support shaft 8 is configured so that it does not come out of the hole 15 even when the rotating shaft 9 is not attracted by the other magnet 13 and falls downward.

[0023] Furthermore, one of the magnets 11 is embedded, for example, at a position away from the axis of the peripheral part of the upper surface of a disk body 17 having a flat upper surface and a diameter larger than that of the rotating shaft 9, at the upper end of the rotating shaft 9, or in a number of spaced-apart positions, and the upper surface of the disk body 17 is arranged so as to face the lower surface of the ceiling plate portion 14a of the protruding chamber portion 14 in parallel and spaced apart relation.

[0024] The other magnet 13 is, for example, embedded in one or more spaced apart positions on the periphery of the underside of a disk body 18 with a flat underside, which is provided at the lower end of the rotating shaft 12a serving as the rotating means 12, at a position away from the axis corresponding to the one magnet 11, and the underside of the disk body 18 is arranged so as to face the upper surface of the ceiling plate portion 14a in parallel with a space between them.

[0025] As the rotation shaft 12a rotates, the other magnet 13 rotates around the rotation shaft 12a, and the magnetic force causes the one magnet 11 to rotate around the rotation shaft 9.

[0026] Although the one magnet 11 and the other magnet 13 are of a thrust type arranged above and below, for example, the one magnet 11 and the other magnet 13 may be arranged in a radial type.

[0027] That is, for example, as shown in Figure 3, one magnet 11 may be arranged on the outer peripheral surface of the upper part of the rotating shaft 9, one magnet or multiple magnets spaced apart circumferentially, and the other magnet 13 may be arranged on the inner peripheral wall of a concave body 19 formed to cover the protruding chamber portion 14 from above, for example, at the lower end of the rotating shaft 12a as the rotating means 12, at a position corresponding to the one magnet 11, one magnet or multiple magnets spaced apart circumferentially.

[0028] Even in this radial type, when the rotating shaft 12a rotates, the other magnet 13 rotates around the rotating shaft 12a, and the magnetic force causes the one magnet 11 to rotate around the rotating shaft 9.

[0029] The one magnet 11 may be rotated around the rotation axis by a method other than the thrust type or radial type.

[0030] Furthermore, instead of forming a pointed portion 8a at the lower end of the support shaft 8, as shown in FIG. 3, the lower end of the support shaft 8 may be formed with a cylindrical portion 8b larger in diameter than the support shaft 8, and the hole 15 of the rotating shaft 9 may be composed of an upper hole portion 20a and a lower hole portion 20b of different diameters, the upper hole portion 20a being formed to have a diameter that allows the support shaft 8 to be inserted and that is smaller than the diameter of the cylindrical portion 8b, and the lower hole portion 20b being formed to have a diameter that is larger than the diameter of the cylindrical portion 8b, and the support shaft 8 may be inserted into the upper hole portion 20a, and the larger-diameter cylindrical portion 8b may be inserted into the lower hole portion 20b, so that the cylindrical portion 8b abuts against the step portion 20c, preventing the rotating shaft 9 from falling.

[0031] It should be noted that other methods may be used to prevent the rotating shaft 9 from falling off the support shaft 8.

[0032] The portion of the rotating shaft 9 that forms the hole 15 may be made into a sliding portion 16 made of a sliding material, and the support shaft 8 made of, for example, SUS may be inserted into the hole 15 so as to contact the inside of the hole 15, so that the rotating shaft 9 can rotate freely and slide on the support shaft 8.

[0033] Next, the operation and effect of the stirring device of the present invention will be described.

[0034] A desired amount of a medium to be stirred, such as a culture solution, is placed in the stirring vessel 7 up to a position below the ceiling plate 7b.

[0035] For example, if the one and the other magnets are thrust type, the rotating shaft 9 will rise due to the attractive force of the other magnet 13 until the receiving portion 15a of the hole 15 abuts against the pointed portion 8a at the lower end of the support shaft 8, and the upper end of the rotating shaft 9 (the upper surface of the disk body 17) will be in close proximity to the ceiling plate portion 14a without contacting it.

[0036] Then, by rotating the other magnet 13 around the rotation axis, the one magnet 11 rotates around the rotation axis without contact.

[0037] Furthermore, although chips and the like may be generated from the sliding portion 16 between the support shaft 8 and the rotating shaft 9, the sliding portion 16 is located within the hole 15, and the gap between the lower surface of the ceiling plate portion 14a and the upper surface of the disk body 17 of the rotating shaft 9 is small, so chips and the like from the sliding portion 16 within the hole 15 remain within the hole 15 and do not enter the object to be stirred in the stirring vessel 7.

[0038] Furthermore, when the other magnet 13 is removed, the gap may become larger, but the shavings and the like will accumulate below the hole 15, and the shavings will no longer penetrate into the object being stirred in the stirring vessel 7.

[0039] According to the present invention, the inside of the stirring vessel can be completely sealed by the magnetic means, and by rotating the rotating shaft on the support shaft installed inside the vessel, the material to be stirred can be powerfully stirred, and it is also possible to prevent shavings and the like from the sliding parts from entering the material to be stirred. [Explanation of symbols]

[0040] 1. Stirring device 2. Stirring vessel 2a Ceiling board 3 rotor blades 4 rotation axes 5 Sliding part 6. Mixing device 7. Stirring vessel 7a Container body 7b Ceiling board 8 Support shaft 8a Point 8b Cylindrical part 9 Rotation Axis 10 Rotor 11 One magnet 12 Rotation means 12a Rotation axis 13 The other magnet 14 Projection chamber 14a Ceiling panel 15 holes 15a Receiving part 16 Sliding part 17 Disk 18 Disk 19 Concave body 20a Upper hole 20b Lower hole 20c stepped section

Claims

[Claim 1] a stirring vessel in which an object to be stirred is placed; a support shaft suspended and fixed within the stirring vessel; a rotation shaft provided on the support shaft so as to be rotatable about its axis; a stirring blade provided on the rotating shaft; one magnet provided on the rotating shaft; and a second magnet that is rotated by a rotating means that rotates the first magnet around its axis and is provided outside the stirring vessel, the rotating shaft has a bottomed hole formed axially downward from an upper end surface of the rotating shaft to a desired length, The stirring device is characterized in that the support shaft is inserted into a hole in the rotating shaft, and the rotating shaft is rotatably provided via a sliding portion provided in the hole.

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