Agitating – Stirrer within stationary mixing chamber – Pump type
Patent
1991-02-14
1994-03-08
Bryant, III, James E.
Agitating
Stirrer within stationary mixing chamber
Pump type
366164, 366262, 415 584, 416 92, B01F 512
Patent
active
052921948
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates in general to a device for circulating fluid and in particular to a device for preparing a range of fluids from a liquid to thin pulpy media.
BACKGROUND OF THE INVENTION
A great number of processes and devices for preparing liquid to thin pulpy media, have become known. These processes and devices are used mainly in the areas of wastewater treatment, water preparation, and the preparation of colloidal mixtures. To produce colloidal mixtures by turbulence, especially by means of rotors, intensive mixing of the starting components is achieved. The medium processed develops a colloidal structure due to the size reduction of macroscopic granules or by binding together a plurality of molecules to form clusters. In a prior-art device of this type (West German Offenlegungsschrift No. DE-OS 32,41,011), the medium to be treated is filled from the top into a funnel-shaped container. The medium flows through the funnel from top to bottom under the effect of the force of gravity. The medium leaves the funnel through an outlet opening provided at the lower end of the funnel. This device generates a vortex-like turbulence, which is intended to bring about intense mixing of the components present in the medium, e.g., cement and water. A further improved variant of this device has also become known (West German Offenlegungsschrift No. DE-OS 33,25,952), in which a two-chamber system is used. The inner, funnel-shaped chamber again serves to turbulize the medium flowing through from top to bottom under the effect of the force of gravity, while the outer chamber serves to return the medium leaving the inner chamber to the inlet opening of the inner chamber. A rotor mounted in the vertical axis of the container is used to return the medium. The vanes of the rotor are located in the outer chamber under the outlet opening of the inner chamber, and the rotor returns the medium to the inlet opening of the inner chamber against the force of gravity.
These prior-art devices have mainly the disadvantage that the efficiency is not high enough to achieve sufficient colloidization of the treated medium within a reasonable time. Despite the fact that propellers are provided to support the turbulizing effect of the force of gravity by suction and pumping, the amount of energy introduced is too small. Another disadvantage is the fact that the medium is returned to the inlet opening of the inner chamber against the force of gravity and this is also brought about by a propeller, which is arranged on the same axis as the propeller for generating the suction effect, which is arranged in the inner chamber. The flow conditions are thus undefined, and the amounts of energy introduced partially offset each other.
SUMMARY AND OBJECTS OF THE PRESENT INVENTION
The device according to the present invention has an inner chamber and an outer chamber. The inner chamber is substantially bottle-shaped with the cross-sectional area initially increasing then decreasing from one end to another. The outer chamber surrounds the inner chamber and it is preferable for the outer chamber to have a convex shape when viewed from the outside. The inner chamber communicates with the outer chamber by a neck opening at a neck end and passage openings at a passage end. A centrifuge wheel is positioned inside the outer chamber and outside the inner chamber. This centrifuge wheel has an intake pipe extending from the center of the centrifuge wheel through the neck opening of the inner chamber and into the inner chamber. The intake pipe has an opening inside the inner chamber. Fluid inside the inner chamber is drawn into the centrifuge wheel through the intake pipe. The fluid is then discharged from the circumferential edge of the centrifuge wheel and into the outer chamber. The fluid in the outer chamber then travels along the outside of the inner chamber and towards the passage openings between the outer chamber and the inner chamber. At the passage openings the fluid flows from the outer chamber into the inner ch
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Bryant III James E.
Cooley Charles
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