Liquid purification or separation – With repair or assembling means
Patent
1991-11-08
1992-12-08
Dawson, Robert A.
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
051695251
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an invertable filter centrifuge comprising a drum mounted in a housing in a cantilever manner and having radial filtrate openings, a cover closing a free end face of the drum, drum and cover being axially displaceable relative to one another, a feed opening for suspension to be filtered provided in the cover and a feed pipe penetrating the feed opening, the feed opening of the cover being sealable by a closure element rotating together with the drum.
In a known invertable filter centrifuge of this type (DE-A 34.30.507), the closure element at the feed opening of the cover is merely a spray protection which prevents liquid spraying out of the drum.
In invertable filter centrifuges of this type it is often advantageous for the drum to be acted upon by a gas subjected to overpressure (for example, superheated steam) in order to increase the hydraulic pressure resulting in the field of centrifugal force in the drum or to blow through the filter cake for the purpose of drying it or also to subject it to a steam wash. In addition, it can alternatively be desired to subject the drum to a vacuum.
A pressure variation of this type in the interior of the drum is not possible in an invertable filter centrifuge of the generic type since in this case the feed pipe penetrating the feed opening is not tightly sealed.
The object of the invention is to improve an invertable filter centrifuge of the generic type such that the centrifugal chamber enclosed by the drum can be acted upon by overpressure or underpressure.
The object is accomplished in accordance with the invention either in that the feed pipe is designed to be withdrawable from the feed opening of the cover and the feed opening is hermetically sealable by a closure element arranged on the cover or in that a movable closure element is provided which is adapted to be placed sealingly over the feed opening of the cover and the end of the feed pipe from the inside of the drum.
The following description of preferred embodiments of the invention serves to explain the invention in greater detail in conjunction with the attached drawings. In these drawings
FIG. 1 is a schematic part-sectional view of an invertable filter centrifuge;
FIG. 2 is a view in the direction of arrow A in FIG. 1 and
FIG. 3 is a schematic part-sectional view similar to FIG. 1 of a different embodiment of an invertable filter centrifuge.
The invertable filter centrifuge illustrated in FIG. 1 comprises a housing 1 which is merely indicated schematically and hermetically seals the entire machine. In this housing, a hollow shaft 3 is rotatably mounted in bearings 4 on a stationary machine frame 2. The end of the hollow shaft 3 located to the right (not illustrated) and projecting beyond the bearing 4 is connected to a drive motor (also not illustrated), which can cause the hollow shaft 3 to rotate rapidly.
A shaft 5 is non-rotatably but displaceably arranged in the interior of the hollow shaft 3. The shaft 5 rotates together with the hollow shaft 3 but is displaceable axially therein.
A bowl-shaped centrifugal drum 7 is flange-mounted with its base 8 in a cantilever manner at the end of the hollow shaft 3 located to the left in FIG. 1 and protruding beyond the bearing 4. The drum 7 has radially extending through openings 11 in its circular-cylindrical side wall 9. The drum 7 is open at its end face opposite the base 8. The one edge 14 of a filter cloth 15 substantially tubular in design is sealingly clamped by means of a holding ring 13 at the flange-like edge 12 of the opening surrounding this open end face. The other edge 16 of the filter cloth 15 is sealingly connected in a corresponding manner to a base portion 17 which is rigidly connected to the displaceable shaft 5 which penetrates freely through the base 8.
A centrifugal chamber cover 19 is rigidly attached to the base portion 17 via spacer bolts 18, leaving an intermediate space free. This cover hermetically closes the centrifugal chamber of the drum 7 by engaging on the edge of its opening and can be lifted freely a
REFERENCES:
patent: 5004540 (1991-04-01), Hendricks
patent: 5092995 (1992-03-01), Gerteis
Dawson Robert A.
Heinkel Industriezentrifugen GmbH & Co.
Reifsnyder David
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