Invertible filter centrifuge with a filler pipe connectable to a

Details Invertible filter centrifuge with a filler pipe connectable to a Invertible filter centrifuge with a filler pipe connectable to a

1990-05-09

1992-03-03

Jones, W. Gary

Liquid purification or separation

With repair or assembling means

210373, 2103803, 2104161, 494 23, 494 25, 494 26, 494 38, 494 41, 494 83, B01D 33067

Patent

active

050929950

DESCRIPTION:

BRIEF SUMMARY
The invention relates to an invertible filter centrifuge comprising a rotary drum which is mounted in a cantilever manner in a housing and has radial passages for filtrate, a lid which is axially displaceable relative to the drum and closes the free front side of the latter, a filler opening on the lid for suspension to be filtered, and a filler pipe which, on the one hand, is secured to the housing and, on the other hand, penetrates the filler opening, the outlet end of the filler pipe being located inside the drum during the centrifuging operation.
An invertible filter centrifuge of this kind used to separate solid and liquid components in a suspension is described in German patent 2 710 624. It is also known to provide on the filler opening of the lid a spray protection means which cooperates with the outlet end of the filler pipe (German published patent application 3 430 507).
In filter centrifuges, it is sometimes advantageous to subject the drum to a gas under excess pressure (for example, hot vapor) to increase the hydraulic pressure occurring in the centrifugal force field or to blow through the filter cake in order to dry it or to subject it to vapor washing. Alternatively, one may also want to subject the drum to negative pressure.
Such a pressure variation in the interior of the drum is not possible in a generic invertible filter centrifuge because the filler pipe penetrating the filler opening thereof is not sealed in a pressure-tight manner.
The object of the invention is to so improve a generic invertible filter centrifuge that the centrifugal chamber enclosed by the drum can be subjected to excess or negative pressure.
The object is accomplished in accordance with the invention in that in order to vary the pressure in the drum, the filler pipe is connectable to a pressurization or depressurization source and is sealed by a combined rotary and sliding seal on the lid.
In a preferred embodiment of the invention, provision is made for the filler pipe to be supported on the housing in an elastic bearing which in combination with the rotary and sliding seal permits additional wobble movements of the filler pipe.
Three things are achieved with this design: The filler pipe is simultaneously used as feed pipe for pressure gas (vapor) or for generating a negative pressure by pumping-off so separate pipes can be dispensed with for this purpose. The combined rotary and sliding seal between filler pipe and lid prevents the pressurized gas from escaping from the centrifugal chamber or gas (atmospheric air) from entering the centrifugal chamber from the ambient. The elastic supporting of the filler pipe on the housing compensates wobble movements of the drum resulting from imbalance and so perfect sealing is ensured by the combined rotary and sliding seal during operation. The sliding displacement of the lid relative to the filler pipe is not thereby impaired.
The following description of preferred embodiments serves in conjunction with the appended drawings to explain the invention in further detail. The drawings show:
FIG. 1 a schematic sectional view of an invertible filter centrifuge in the work phase of the centrifuging;
FIG. 2 schematically the centrifuge of FIG. 1 in the work phase of throwing off the solids;
FIG. 3 an enlarged view of a rotary and sliding seal between filler pipe and centrifugal chamber of the centrifuge;
FIG. 4 the rotary and sliding seal of FIG. 3 during wobble movement of the filler pipe;
FIG. 5 a modified embodiment of the filler pipe with ventilating pipe; and
FIG. 6 a perspective detail view of the filler pipe end.
The invertible filter centrifuge shown in FIG. 1 comprises a schematically illustrated housing 1 sealingly enclosing the entire machine. A hollow shaft 3 is mounted for rotation in bearings 4, 5, on a stationary machine frame 2 in the housing 1. A pressure medium cylinder 6 is flanged in a sealed manner on the end of the hollow shaft 3 protruding beyond the bearing 5 on the right in FIGS. 1 and 2. A drive wheel 7 is rotationally fixedly connected to the cylinder

REFERENCES:
patent: 3623613 (1971-11-01), Quetsch
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patent: 4502699 (1985-03-01), Mukerji
patent: 4589865 (1986-05-01), Gullers
patent: 4702831 (1987-10-01), Gerteis
patent: 4808308 (1989-02-01), Flory
patent: 4915851 (1990-04-01), Flory
patent: 5004540 (1991-04-01), Hendricks

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