Solid material comminution or disintegration – Apparatus – Including means applying fluid to material
Reexamination Certificate
1999-11-12
2001-04-03
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
Including means applying fluid to material
C241S131000
Reexamination Certificate
active
06209811
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention is generally directed to a dispersing apparatus for dispersing solid particles in a liquid medium.
A prior art “fluid energy” disperser is shown and described in U.S. Pat. No. 5,156,344. This prior art disperser utilizes a rotor assembly mounted within a stator assembly to disperse solid particles within a liquid medium. The rotor assembly is rotated within the stator assembly to disperse the solid particles within the liquid medium.
A prior art “mechanical energy” shot mill disperser is shown and described in U.S. Pat. No. 3,653,600. This prior art disperser utilizes steel shot which is retained in a mixing vessel and agitated by rotating impellers connected to a drive shaft to disperse the solid particles within the liquid medium. The apparatus has a rotor separator device connected to and driven by the drive shaft near the mixing vessel outlet to separate the steel shot from the finished product.
At times, it is desired to grind pigments in a batch mode, at an intensity greater than “fluid energy” dispersers can achieve, but in an easier and less complex manner than “mechanical energy” shot mills provide. The present invention provides such a disperser. Other features and advantages of the present invention will become apparent upon a reading of the attached specification in combination with a study of the drawings.
OBJECTS AND SUMMARY OF THE INVENTION
A general object of the present invention is to provide a dispersing apparatus used to grind pigments in a batch mode, at an intensity which is greater than “fluid energy” dispersers can accomplish, and in an easier and less complex manner than “mechanical energy” shot mills can accomplish.
Another general object of the present invention is to provide a dispersing apparatus including an assembly having rollers which advance under shaft rotation and roll over a wet film of solids suspended in a liquid.
An object of the present invention is to provide a roller-stator disperser in which roller to stator dynamic pressure can be increased or decreased.
A further object of the present invention is to provide a roller assembly for a roller-stator disperser which allows the rollers to be positioned against or away from the stator assembly as a result of the viscosity/rheology of the slurry being processed.
Yet an even further object of the present invention is to provide a roller assembly for a roller-stator disperser which allows the rollers to move as they wear during use.
An even further object of the present invention is to provide a roller-stator disperser which uses a deflector to create pumping with a mixing vessel.
Briefly, and in accordance with the foregoing, the present invention discloses an apparatus for dispersing solid particles carried in suspension in a liquid medium. The apparatus includes a mounting frame, a rotatable agitator shaft connected thereto, a motor drive assembly carried thereby for rotating the agitator shaft, and a roller-stator assembly carried by the mounting frame. The roller-stator assembly includes a roller assembly and a stator assembly.
The stator assembly includes a plurality of stator support rods extending from the mounting frame and a stator ring attached to the stator support rods. The roller assembly is connected to the agitator shaft and is positioned within the stator ring.
The roller assembly includes a plurality of upper and lower support portions which form pairs and each of which has a roller positioned therebetween which is rotatable with respect to the pair and with respect to the stator ring. The upper and lower support portions can be affixed to the agitator shaft at the same angle relative thereto or at varying angles relative thereto. The upper and lower support portions have slots therein in which the respective roller is mounted such that the roller can move inwardly and outwardly relative to the agitator shaft. Such inward and outward motion can be radial.
A deflector is mounted below the stator ring such that when material passes through the stator ring, the material encounters the deflector and is recirculated for another pass through the disperser. The deflector can include vertical fins protruding upwardly therefrom to create pumping within the mixing vessel.
In a second embodiment, the stator ring includes a plurality of spaced apart members on an inner surface thereof. Each roller has a plurality of teeth which are capable of intermeshing with the spaced apart members as the roller assembly rotates relative to the stator assembly.
In addition, the stator ring can be provided with a plurality of venturi openings therethrough for allowing material to pass therethrough during dispersion.
In yet another embodiment, each roller can be provided with a tapered outer wall. Means for varying the position of the stator assembly relative to the roller assembly can be provided such that varying amounts of each said roller is in contact with the stator ring.
Other objects of the present invention will become apparent upon a reading of the attached specification in combination with a study of the drawings.
REFERENCES:
patent: 859118 (1907-07-01), Schieffler
patent: 2115314 (1938-04-01), McErlean
patent: 2413793 (1947-01-01), Sharp
patent: 3027103 (1962-03-01), Mischanski
patent: 3135474 (1964-06-01), Schold
patent: 3653600 (1972-04-01), Schold
patent: 3844490 (1974-10-01), Schold et al.
patent: 4044957 (1977-08-01), Schold
patent: 4197019 (1980-04-01), Schold
patent: 4394981 (1983-07-01), Schold
patent: 4854720 (1989-08-01), Schold
patent: 5156344 (1992-10-01), Tippett
patent: 5785262 (1998-07-01), Tippett
patent: 6003439 (1999-12-01), Knezek et al.
patent: 1187850 (1985-05-01), None
patent: 188999 (1907-10-01), None
Schold Welding & Machine Co. “Schold Dispersers”.
Rosenbaum Mark
Trexler, Bushnell Giangiorgi, Blackstone & Marr, Ltd.
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