JPH09239254A - Dispersing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the life of a vessel inner cylinder by uniformizing the abrasion of a vessel inner cylinder to prevent a hole from being bored in the inner cylinder, selecting material quality having high abrasion resistance against a dispersion and increasing the wall thickness of the inner cylinder. SOLUTION: In a dispersing apparatus 1 wherein a rotary agitator shaft 22 is arranged inside a vessel inner cylinder 51 and the magnetic dispersion supplied into the gap between the vessel inner cylinder 51 and the agitator shaft 22 is dispersed, the vessel inner cylinder 51 is molded by centrifugal casting. By this constitution, the roundness of the vessel inner cylinder 51 can be increased and the strength thereof is stabilized and the abrasion thereof becomes uniform.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a dispersion device,
More specifically, a stirring pin or the like is provided on the outer peripheral surface of the agitator shaft and the inner peripheral surface of the fixed container to disperse the liquid to be dispersed supplied to the space between the fixed container and the agitator shaft by applying a shearing force. In particular, the present invention relates to a dispersion device suitable for stirring magnetic dispersion liquids.

[0002]

2. Description of the Related Art Conventionally, some industrial fields require processes such as dispersion of liquid and dispersion / kneading of liquid and powder. One of them is magnetic dispersion. The dispersion storage that disperses this magnetic dispersion liquid is rotatably arranged at the center of a fixed container (vessel inner cylinder) to which an agitator shaft (rotor) in which a large number of agitation pins are implanted is appropriately fixed. A vessel jacket, which is an outer casing, is arranged on the outer peripheral side of the container. The stirring pins are arranged so as to face each other on the outside of the agitator shaft and the inside of the fixed container, and the liquid to be dispersed is supplied and appropriately dispersed in this space together with, for example, glass beads and steel balls. Further, an outer casing is arranged outside the fixed container with a gap from the fixed container, and a temperature can be adjusted by passing cooling water or the like into a gap between the outer casing and the fixed container. .

The temperature control structure is divided into a large number of small chambers by, for example, a partition plate extending along the axial direction of the agitator shaft, and between the outside of the small chambers and the outer casing, the temperature control structure is formed. The outermost peripheral space, which is one space, is formed over the entire circumference of the outer casing. These small chambers and outermost space are all continuous with appropriately formed communication holes. Then, for example, cooling water is supplied to a predetermined small chamber, the cooling water sequentially flows to the next small chamber, and is discharged from the last small chamber to the outermost peripheral space between the outer casing and the vessel jacket. The structure is such that it is discharged from the space to the outside of the vessel jacket. In such a conventional dispersion apparatus for magnetic dispersion liquid, the magnetic dispersion liquid is supplied between the agitator shaft and the fixed container, and the magnetic dispersion liquid is stirred by the stirring pin of the rotating agitator shaft and the stirring pin of the fixed container. By doing so, shearing force is applied and dispersed. The heat generated at this time is cooled by the cooling water flowing around the outer circumference of the fixed container, and the temperature is adjusted appropriately.

[0004]

In a conventional dispersion device for dispersing a magnetic dispersion liquid or the like, a fixed container (vessel inner cylinder) is formed into a cylindrical shape by bending a metal plate material and welding the ends thereof. ing. Therefore, since it is difficult to increase the roundness of the fixed container, the fixed container has a part that protrudes inward.
As a result, the inner surface of the fixed container is unevenly worn, and the portion protruding inward is extremely worn, and in some cases, a hole may be formed there. In addition, the strength of the welded part is particularly unstable compared to the other parts, wear of this welded part progresses extremely and holes are opened, and problems such as mixing of cooling water into the liquid to be dispersed occur. It was easy.

Although it is conceivable to increase the thickness of the metal plate material so that it can be used for a long time even if the wear progresses, the fixed container is formed by bending the metal plate material as described above. Therefore, it is extremely difficult to increase the wall thickness to a certain extent or more because the workability is lowered and the working accuracy is lowered. Furthermore, since the material used for bending must be selected from commercial products, there are restrictions on the material that can be used, especially when dispersing a material with high wear resistance such as the target magnetic dispersion liquid. It was the current situation that an appropriate one could not be selected. For this reason, the conventional ones have the drawbacks of rapid wear, extremely short life, and extremely short maintenance cycles. Therefore, the manufacturing cost of the liquid to be dispersed is high.

An object of the present invention is to solve the above-mentioned problems, and to make the wear of the fixed container uniform and prevent the formation of local holes, and a material having a high wear resistance against the liquid to be dispersed. It is an object of the present invention to provide a dispersion device capable of increasing the thickness of the fixed container by selecting the thickness and increasing the wall thickness.

[0007]

The above object of the present invention is to provide an agitator shaft for stirring rotatably inside a fixed container with a fixed interval from the fixed container, the fixed container and the agitator. In a dispersion device that disperses a liquid to be dispersed supplied to a space with a shaft by rotation of the agitator shaft, the fixed container is formed by centrifugal casting. be able to. In this dispersion device, for example, a fixed container (vessel inner cylinder) that comes into contact with a liquid to be dispersed such as a magnetic dispersion liquid is formed by centrifugal casting, so that the roundness can be increased. Further, since there is no welded portion, the strength is stable. Further, an arbitrary material can be selected according to the liquid to be dispersed and the wall thickness can be increased.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a dispersion apparatus according to the present invention will be described in detail with reference to the drawings. 1 is a front view showing a dispersion device for dispersing a magnetic dispersion liquid, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG.

As shown in FIG. 1, this magnetic dispersion liquid dispersion apparatus 1 includes a base 11, a dispersion unit 12 fixed on the base 11, and a drive unit 13 disposed on the side of the dispersion unit 12.
And the dispersion liquid supply pump 1 arranged below the dispersion unit 12.
4 is provided. The dispersion part 12 is for dispersing the magnetic dispersion liquid, and includes a support part 21 fixed to the base 11, an agitator shaft 22 (rotor) for stirring which is rotatably attached to the support part 21, and an agitator shaft 22. And a cylindrical vessel 23 arranged on the outer peripheral side of the. The vessel 23 has a double structure including a vessel inner cylinder 51 and a vessel jacket 52. On the other hand, on the outer peripheral surface of the agitator shaft 22, a large number of stirring pins 24 are planted for stirring the magnetic dispersion liquid, and on the inner peripheral surface of the vessel inner cylinder 51, a large number of stirring pins 80 are also planted. Further, the vessel 23 is provided with a temperature adjusting structure (see FIG. 3) for adjusting the temperature of the magnetic dispersion liquid as described later.

A dispersion liquid inlet 26 and a dispersion liquid outlet 27 are provided at both ends of the dispersion chamber 25 between the agitator shaft 22 and the vessel inner cylinder 51. As shown in FIG. 2, the dispersion liquid inlet 26 is connected to the discharge port 30 of the dispersion liquid supply pump 14 via a pipe 28 and a valve 29. As shown in FIG. 3, the agitator shaft 22 includes an inner cylinder 81 and an outer cylinder 8 concentrically arranged on the outer peripheral side thereof.
2, and the above-mentioned stirring pin 24 is planted in the outer cylinder 82. A plurality of through holes 83 are provided at the tip of the inner cylinder 81. In addition, the inner cooling chamber 8 inside the inner cylinder 81
4, a cooling water inlet 85 is provided at the end on the root side, and cooling water, which is a temperature control liquid, is supplied into the inside cooling chamber 84 from this. Further, a cooling water discharge port 87 including a cooling water introduction port 85 is provided at the end of the outer cooling chamber 86 between the inner cylinder 81 and the outer cylinder 82.

The vessel 23 outside the agitator shaft 22 is constructed so that the temperature of the magnetic dispersion liquid in the dispersion chamber 25 can be adjusted. As described above, the vessel inner cylinder 51 and the vessel jacket 52 are provided. ing. The stirring pin 80 described above is attached to the vessel inner cylinder 51 by an appropriate fixing means. The vessel inner cylinder 51 is formed by centrifugal casting using a material having high abrasion resistance with respect to the magnetic dispersion liquid to be dispersed, in order to increase circularity and abrasion resistance. That is, the processing of the vessel inner cylinder 51 is performed by pouring the molten metal while rotating the mold, pressurizing the casting by utilizing the centrifugal force thereof, and further separating impurities by the difference in centrifugal force inside and outside the casting, particularly the portion near the outer periphery. You can get a good quality part. In the present invention, either a sand mold or a mold may be used as the mold. Here, the material of the vessel inner cylinder 51 is formed by centrifugal casting, and the inner and outer peripheral surfaces and the end surfaces of this material are machined to improve the processing accuracy such as the roundness and to improve the impurities near the inner and outer peripheral surfaces. Can be scraped off to make the composition uniform.

The vessel inner cylinder 51 and the vessel jacket 52 are concentrically arranged, and although not shown, a small chamber is formed in the gap between them so as to allow cooling water to pass therethrough. A cooling water inlet 55 is provided on the outer peripheral wall of the small chamber at the position.
5 is provided, and a cooling water outlet 56 is provided in a small chamber farthest from the small chamber.

As shown in FIG. 1, a mechanical seal 32 is interposed in the connecting portion between the agitator shaft 22 of the dispersion portion 12 and the drive portion 13, and the magnetic dispersion liquid in the dispersion chamber 25 is transmitted through the agitator shaft 22. It does not leak outside. The drive unit 13 includes a motor 41 arranged above the support unit 21, a fluid coupling 42 connected to the rotation shaft of the motor 41, and a control unit 43. A pulley 44 is attached to an output shaft (not shown) of the fluid coupling 42, and one end of a belt 45 is wound around the pulley 44. The other end of the belt 45 has the agitator shaft 2
It is wound around a pulley 46 attached to the end of No. 2.

Next, the operation of the dispersion device 1 for the magnetic dispersion liquid will be described. In this magnetic dispersion liquid dispersing device 1,
As shown in FIG. 1, the magnetic dispersion liquid discharged from the dispersion liquid supply pump 14 is supplied to the dispersion chamber 25 through the dispersion liquid inlet 26 of the dispersion unit 12. The magnetic dispersion liquid supplied to the dispersion chamber 25 is agitated by a large number of agitation pins 24 of the agitator shaft 22 which is rotationally driven by the motor 41.

At this time, the vessel inner cylinder 5 was added to the magnetic dispersion liquid.
The stirring pin 80 fixed to 1 and the stirring pin 24 of the rotating agitator shaft 22 exert a shearing force to disperse the particles appropriately. The dispersed magnetic dispersion liquid is discharged from the dispersion liquid outlet 27 and sent to the next process such as a coating process. When the magnetic dispersion liquid is dispersed, as shown in FIG. 3, cooling water is supplied from the cooling water inlet port 85 of the agitator shaft 22 into the inner cooling chamber 84. The cooling water flows into the outer cooling chamber 86 from the through hole 83 at the end of the inner cooling chamber 84, flows axially in the outer cooling chamber 86, and is discharged from the cooling water discharge port 87.

The cooling water cools the magnetic dispersion liquid around the agitator shaft 22. The cooling by the cooling water can be adjusted by adjusting the cooling water temperature or the flow rate. That is, the temperature adjustment is appropriately set according to the characteristics of the magnetic dispersion liquid, and a simple adjustment method of changing the flow rate of water at a constant temperature is usually adopted. At the same time as the cooling water is supplied to the inside of the agitator shaft 22,
Cooling from the vessel inner cylinder 51 side is also performed at the same time. That is, the cooling water is also supplied from the cooling water inlet 55 of the vessel 23. The cooling water sequentially flows through appropriately divided passages (not shown) and is discharged from the cooling water outlet 56.

As described above, the magnetic dispersion liquid in the dispersion chamber 25 is cooled from inside and outside by the agitator shaft 22 and the vessel inner cylinder 51, and is adjusted to a temperature suitable for dispersion as a whole. As a result, an unnecessary temperature rise due to the dispersion treatment is avoided, a suitable dispersion treatment is surely performed, and an extremely well dispersed magnetic dispersion liquid is supplied to the next step.
As described above, in this magnetic dispersion liquid dispersing device 1, since the vessel inner cylinder 51 is formed by centrifugal casting, the roundness can be increased. As a result, since there is no local protrusion on the inner surface of the vessel cylinder 51 and the strength is stable without a welded portion as in the conventional case, the inner peripheral surface is evenly worn and locally worn as in the conventional case. It is possible to prevent the holes from opening as they progress. Therefore, problems such as leakage of cooling water due to wear due to long-term use can be eliminated.

Further, since the material of the vessel inner cylinder 51 can be arbitrarily selected, it is possible to freely select a material having high abrasion resistance with respect to the magnetic dispersion liquid to be dispersed. The vessel inner cylinder 51 can be manufactured using an optimum material, and the life can be extended without uneven wear. Furthermore, since the thickness of the vessel inner cylinder 51 can be set arbitrarily, the life can be further extended by increasing the thickness. Further, in the present invention,
The agitator shaft 22 is also preferably formed by centrifugal casting, like the vessel inner cylinder 51. As a result, the agitator shaft 22 can also be a shaft made of high-strength steel and having a uniform thickness, and a dispersion device with a much longer life can be obtained.

[0019]

As described above, according to the present invention,
Since the inner vessel of the vessel that comes into contact with the magnetic dispersion is formed by centrifugal casting, it is easy to increase the roundness, and because the material components can be made uniform and stable, the wear resistance is uniform over the entire inner vessel of the vessel. Since the strength is stable, uneven wear can be avoided, and it is possible to prevent a hole from being formed in the vessel inner cylinder. In addition, even in a material in which the liquid to be dispersed requires extremely high wear resistance for a dispersion container, such as a magnetic dispersion liquid,
A material with high wear resistance can be selected and the wall thickness can be freely increased without impairing the roundness, so the life of the inner vessel of the vessel can be dramatically extended compared to conventional products. it can.

[Brief description of drawings]

FIG. 1 is a diagram showing a dispersion device of a magnetic dispersion liquid according to the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

3 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dispersion device 12 Dispersion part 13 Drive part 22 Agitator shaft 23 Vessel 24 Stirring pin 25 Dispersion chamber 51 Vessel inner cylinder 52 Vessel jacket

Claims (1)

[Claims] 1. An agitator shaft for stirring is rotatably disposed inside the fixed container at a fixed interval from the fixed container, and the liquid to be dispersed supplied into the space between the fixed container and the agitator shaft. A dispersion device for dispersing by rotating the agitator shaft, wherein the fixed container is formed by centrifugal casting.