JP2003010668A - Rotary impeller stirrer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To eliminate the necessity of a shaft seal for a rotating shaft, to completely confine powder inside a stirring tank, and to make a stirring tank and a driving means of a rotating blade in a stirring tank extremely easy. Provided is a rotary impeller stirrer that can be detached from a rotary blade. A rotating shaft (1) rotated by a rotation driving means (11).
The disk 13 is attached to the tip of the rotor 2, and the rotary blade 22 is rotatably mounted on the inner surface 20a of the stirring tank 20 formed separately from the rotating shaft. Magnets 14 and 24 are attached to the surfaces, respectively, and a stirring tank is arranged above the disk with a gap in a positional relationship such that the magnet on the back surface of the rotor and the magnet on the disk surface face each other. When the disk is rotated by the rotation driving means, the rotating force is transmitted by the magnetic force, and the rotating blade inside the stirring tank can be rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary blade type stirring device for rotating a rotary blade provided inside a stirring tank to mix and stir the raw material powder inside the stirring tank or to perform wet granulation. Is.

[0002]

2. Description of the Related Art In order to uniformly mix and stir raw powders and perform wet granulation, the tip of a rotary shaft rotated by a rotary drive means is passed through the central portion of the bottom wall of the stirring tank and placed in the stirring tank. BACKGROUND ART A rotary blade type stirring device having a structure in which a rotary blade is fixed to the protruding tip portion of this rotary shaft is widely used from the past, and is disclosed in, for example, Japanese Patent Laid-Open No. 2001-9251.

Further, in the above-mentioned publication, in order to prevent powder and the like in the stirring tank from leaking out from the through hole formed in the bottom wall of the stirring tank for projecting the rotating shaft, a purge gas is supplied from the through hole to the stirring tank. It is also described to use a shaft seal by a gas purging method in which the gas is jetted inward.

[0004]

In the above-mentioned conventional apparatus, the tip of the rotating shaft is penetrated through the through hole in the bottom wall of the stirring tank, so that the shaft for preventing the leakage of powder or the like from the stirring tank. Although a seal structure is required, the rotating shaft rotates at high speed during operation, and the gas purge type shaft seal cannot always completely prevent leakage of powder and the like.

When performing wet granulation, a liquid binder is added to the raw material powder in order to carry out the granulation efficiently, but the powder or liquid containing the liquid binder in the shaft seal portion due to capillary phenomenon or the like. Binder penetration problems have been identified.

Further, in the conventional apparatus, the stirring tank portion is integrally formed with the rotation driving means such as the motor through the rotary shaft, and it is impossible to easily remove only the stirring tank. Therefore, when several kinds of powders are continuously treated, it is necessary to remove and wash the powders remaining in the stirring tank each time in order to prevent the powders from being mixed.

Therefore, an object of the present invention is to eliminate the need for a shaft seal, to completely confine powder and the like in the stirring tank, and to make the stirring tank and the rotation driving means for the stirring blade inside the stirring tank extremely easy. Can be removed,
It is to provide a new and improved rotor impeller.

[0008]

That is, the rotary vane type stirring device of the present invention has an inner surface of a stirring tank which is formed separately from the rotary shaft by attaching a disk to the tip of the rotary shaft rotated by the rotary drive means. A rotor is rotatably attached to the rotor, magnets are attached to the back surface of the rotor and the surface of the disk, and the magnets on the back surface of the rotor and the magnet on the surface of the disk face each other above the disk. The stirring tank is arranged with a gap, and when the disk is rotated by the rotation driving means, the rotating force is transmitted by the magnetic force so that the rotating blades inside the stirring tank are rotated. is there.

According to the apparatus of the present invention having the above-mentioned structure, the rotary blades in the stirring tank are rotated by the rotational driving force transmitted in a non-contact manner by utilizing the magnetic force from the outside, and the stirring is performed. Since it is not necessary to form a through hole through which the rotation shaft penetrates in the wall of the tank, the stirring tank can have a completely sealed structure.

Further, since the drive unit comprising the rotary drive means, the rotary shaft and the disc and the stirring tank are separate structures and arranged in a non-contact state, it is extremely easy to remove the stirring tank from the drive unit. It becomes possible to do it.

In a preferred embodiment of the present invention, the rotary blade, the disk, and the stirring tank wall sandwiched between the rotary blade and the disk are made of ceramics. This allows these members themselves to be non-magnetic and, as a result,
The rotating force of the disk rotating outside the stirring tank can be reliably transmitted to the rotating blade inside the stirring tank by the magnetic force.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a rotary blade type stirring device according to the present invention, in which a driving device 10 is arranged outside the stirring tank 20 in a non-contact state with the stirring tank 20. ing. The drive device 10 includes a rotary drive means 11 such as a drive motor, and a rotary shaft 12 extending from the rotary drive means 11.
And a disc 13 attached to the tip of the rotary shaft 12, and the disc 13 is rotated via the rotary shaft 12 by operating the rotation driving means 11.

On the other hand, the stirring tank 20 has an inner surface 20 at the bottom thereof.
a has a fixed shaft 21 standing upright from the center, and a rotary blade 22 is rotatably attached to the fixed shaft 21. A bearing mechanism 23 such as a ball bearing is provided at a contact portion between the two so that the rotary blade 22 can smoothly rotate with respect to the fixed shaft 21.

The surface of the disk 13 of the drive unit 10 (the stirring tank 2
The surface facing the 0 side) and the rotor 2 inside the stirring tank 20
On the back surface of 2 (the surface facing the inner surface 20a of the stirring tank),
Permanent magnets 14 and 24 made of rare earth magnets or the like are attached, respectively.

The drive unit 10 and the stirring tank 20 are composed of a disk 13
The stirring tank 20 is arranged above the drive unit 10 in a non-contact state with a gap so that the magnet 14 mounted on the front surface and the magnet 24 mounted on the back surface of the rotary blade 22 face each other.

When the apparatus of the present invention is operated, a predetermined amount of raw material powder is charged into the stirring tank from an openable / closable lid (not shown) provided in the stirring tank 20, and the rotation driving means 11 of the driving device 10 is charged. To start the rotary shaft 12 and the disk 13
To rotate. Due to the magnet 14 rotating with the rotation of the disk 13, a rotational driving force due to a magnetic force is generated and transmitted to the magnet 24 via the wall of the stirring tank, so that the rotary blade 22 is rotated.

The magnet 24 attached to the back surface of the rotary blade 22 may be attached to the back surface of each blade in such a manner as to maximize the area when the rotary blade has three blades. Also,
The magnet 14 attached to the surface of the disk 13 has a hole in its center so that the rotor 22 can be restarted immediately even if the rotor 22 slips against the disk when torque is applied to the rotor 22 during rotation. It is desirable to attach a donut-shaped magnet.

The magnet 14 and the rotor 2 attached to the disk 13
If a substance that disturbs the transmission of the rotational driving force by the magnetic force is present between the magnet 24 attached to the magnet 2 and the magnet 24 attached to the magnet 24, the transmission of the desired rotational driving force is hindered. The stirring tank wall is made of ceramics,
It is desirable that these members themselves are not magnetic. Regarding the wall of the stirring tank, it is preferable that only the wall portion on which the rotary blades are arranged is made of ceramics in consideration of the strength of the whole stirring tank and the attachment of the opening / closing lid.

In the illustrated embodiment, the rotary blade 2
A stirring blade 25 having a structure exactly similar to that of the rotating blade 22 and slightly smaller than the rotating blade 22 is also rotatably disposed on the inner surface 20b of the stirring tank side, and the rotating blade 2 is provided by a driving device 30 provided outside the stirring tank.
5 is designed to be rotated.

[0020]

[Test Example] The device shown in FIG. 1 was manufactured, and the rotary blade 22 on the inner surface of the stirring tank was rotated at 0 to 2000 rpm, and the rotary blade 25 on the inner surface of the side was rotated at 0 to 4500 rpm for 60 minutes to rotate the motor of the rotation driving means. As a result, the rotary driving force of the disk could be transmitted to the rotary blade inside the closed stirring tank without any inconvenience.

Further, 200 g of Al ₂ O ₃ powder was charged into a stirring tank, 50 cc of water was added as a binder to the stirring tank, and the rotary blade was stirred to conduct a granulation test. The particles could be produced. During this granulation test, no leakage of powder or binder to the outside of the stirring tank was observed.

[0022]

As can be seen from the above description, according to the present invention, the rotary driving force is transmitted from the outside of the stirring tank by the magnetic force to rotate the rotating blades inside the stirring tank. It is not necessary to provide a through hole through which the shaft penetrates, the stirring tank can have a closed structure, and it is possible to completely prevent the powder or liquid from leaking to the outside of the stirring tank.

Further, since the driving device and the stirring tank are separate bodies which do not contact each other, the stirring tank can be easily removed from the driving device. As a result, operations such as loading and unloading the raw material powder into and from the stirring tank and cleaning the stirring tank can be performed very simply and quickly, and the maintenance and maintenance of the apparatus are improved. Therefore, especially when treating a powder containing a nuclear fuel material, the exposure of the worker can be reduced.

Further, since the stirring tank can be easily removed from the driving device, it is easy to prepare a plurality of stirring tanks and use the stirring tank properly for each kind of powder to be treated, so that other powders can be stirred. It is possible to prevent mixing and contamination of other powder due to remaining in the tank.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing an embodiment of a rotary blade type stirring device according to the present invention.

[Explanation of symbols]

10: Drive device 11: rotation drive means 12: Rotation axis 13: Disc 14: Magnet attached to the disk 20: Stirring tank 20a, 20b: inner surface of stirring tank 21: Fixed axis 22: Rotor 23: Bearing mechanism 24: Magnet attached to the rotor

Claims (2)

[Claims] 1. A disk is attached to the tip of a rotary shaft rotated by a rotary drive means, a rotary blade is rotatably attached to the inner surface of a stirring tank formed separately from the rotary shaft, and the back surface of the rotary blade and A magnet is attached to the surface of the disk, and the stirring tank is arranged with a gap above the disk in a positional relationship such that the magnet on the back surface of the rotor and the magnet on the disk surface face each other. A rotating blade type stirring device characterized in that when a disc is rotated, a rotating force is transmitted by a magnetic force so that the rotating blade inside the stirring tank is rotated. 2. The rotary blade type agitator according to claim 1, wherein the rotary blade, the disk, and the stirring tank wall sandwiched between the rotary blade and the disk are made of non-magnetic ceramics. apparatus.