Liquid purification or separation – Filter – Movable medium
Patent
1993-02-25
1994-04-19
Dawson, Robert A.
Liquid purification or separation
Filter
Movable medium
210232, 210373, 2104161, 494 23, 494 25, 494 26, 494 38, 494 41, 494 83, B01D 33067
Patent
active
053043065
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an invertible filter centrifuge comprising a self-supporting drum rotatably mounted in a housing, this drum having radial filtrate passages and being capable of receiving an overpressure or underpressure, a lid closing the free front side of the drum, said drum and lid being axially movable relative to one another, a feed opening for the suspension to be filtered arranged in the lid and a feed pipe sealingly inserted through the feed opening.
In a known invertible filter centrifuge of this type (DE 37 40 411 A1), a combined rotating and slide seal is arranged between the stationary feed pipe and the feed opening of the lid, allowing pressure or underpressure operation in the drum. The combined rotating and slide seal arranged directly in the feed opening of the lid has the disadvantage that due to the unavoidable rubbing sealing elements, severe abrasion in the region of the drum results, which can easily lead to undesirable soiling of the filtered product. Seeing that the drum rotates at a very high number of revolutions during the filtration process, severe abrasion results which gives rise to considerable soiling.
The object of the invention is to improve an invertible filter centrifuge of the generic type such that a combined rotating and slide seal causing abrasion in the region of the feed opening of the drum can be omitted.
The object is accomplished in accordance with the invention in that the feed pipe is rotatably mounted around its longitudinal axis and can be caused to rotate together with the drum around this axis.
Seeing that feed pipe and drum rotate synchronously according to the general inventive concept, the feed opening in the drum lid, through which the feed pipe is inserted, merely needs to be provided with a simple seal without rubbing sealing elements. Hereby, the soiling tendency of the abrasion is completely avoided.
The following description of preferred embodiments of the invention serves to explain the invention in greater detail in conjunction with the attached drawings.
In the drawings:
FIG. 1: is a schematic part-sectioned view of an invertible filter centrifuge;
FIG. 2: is an enlarged detail view in the region A of FIG. 1 and
FIG. 3: is a schematic and enlarged part-sectioned view of an embodiment of an invertible filter centrifuge modified in comparison with FIG. 1.
The invertible filter centrifuge schematically illustrated in FIG. 1 comprises a housing 1 which sealingly encloses the entire machine, and in which a hollow shaft 3 is rotatably mounted in bearings 4 on a stationary machine frame 2. The end (not illustrated) of the hollow shaft 3 situated on the right of FIG. 1 and protruding beyond a corresponding bearing 4, is connected with a drive motor (also not illustrated), via which the hollow shaft 3 is caused to rotate quickly.
On the inside of the hollow shaft 3 an axially movable shaft 5 is arranged which is non-rotatably joined to the hollow shaft 3. The shaft 5, therefore, rotates together with the hollow shaft 3, but is, however, still axially movable inside the hollow shaft.
At the end of the hollow shaft 3, to the left of FIG. 1, protruding beyond the bearing 4 is a self-supporting and non-rotatable, cup-shaped centrifugal drum 7 which is flange connected to its base 8. The drum 7 has radially extending discharge openings 11 in its circular-cylindrical side wall 9. The drum 7 is open on its front side, opposite to its base 8. The flange-like edge 12 of the opening, surrounding this open front side, is sealingly clamped at one edge 14 of an essentially tube-like designed filter cloth 15 by means of a holding ring 13. The other edge 16 of the filter cloth 15 is sealingly connected with a base plate 17 in the corresponding way, this plate being rigidly connected to the moveable shaft freely penetrating the base 8. The filter cloth 15 covers the filtrate passages formed by the discharge openings 11.
Rigidly attached to the base plate 17 via rigid spacer bolts 18, leaving an intermediate space free, is a centrifugal chamber lid 19, which tig
REFERENCES:
patent: 5004540 (1991-04-01), Hendricks
patent: 5092995 (1992-03-01), Gerteis
patent: 5169525 (1992-12-01), Gerteis
Dawson Robert A.
Heinkel Industriezentrifugen GmbH & Co.
Reifsnyder David
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