Liquid purification or separation – With repair or assembling means
Patent
1992-04-14
1994-01-11
Dawson, Robert A.
Liquid purification or separation
With repair or assembling means
210370, 2103801, 2103803, 2105121, B01D 3300
Patent
active
052778045
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a sleeve filter centrifuge according to the preamble to patent claim 1.
In known sleeve filter centrifuges of this type (DE-PS 27 09 894) the support shaft, which is securely connected to the lid of the drum, is telescopically displaced back and forth in the hollow shaft bearing the drum with the aid of a hydraulic drive when the drum is intended to be opened or closed by inverting the filter cloth. Since leakages cannot, in principle, be ruled out in the case of hydraulic drive means, either in the region of the actual drive cylinder or in the pipes leading to this cylinder and the valves arranged therein, stoppages can, in principle, be caused hereby and these are extremely serious, in particular, when filtering sensitive products, for example pharmaceuticals, or in processes Carried out under sterile conditions.
The object of the invention is therefore to improve a sleeve filter centrifuge of the generic type such that the hydraulic drive previously associated with the opening and closing of the drum is dispensed with and, therefore, disruptive leakages of the hydraulic fluid are ruled out.
The following description of a preferred embodiment 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 side view of a sleeve filter centrifuge in the operative phase of centrifugation;
FIG. 2 shows schematically the centrifuge of FIG. 1 in the operative phase of solids discharge;
FIG. 3 shows schematically an enlarged view of a mechanical drive means for opening and closing the drum of the sleeve filter centrifuge, and
FIG. 4 shows schematically an embodiment modified in comparison with FIG. 3 .
The sleeve filter centrifuge illustrated in the drawings comprises a housing 1 which is indicated schematically and hermetically encloses the entire machine. In this housing, a hollow shaft 3 is rotatably mounted in bearings 4, 5 on a stationary machine frame 2. The end of the hollow shaft 3 protruding beyond the bearing 5 is non-rotatably connected to a drive gear 6, via which the hollow shaft 3 is caused to rotate rapidly by an electric or other motor 7 by means of a V belt.
The hollow shaft 3, which extends rigidly between the bearings 4, 5, has an axially extending wedge-shaped groove which is indicated by broken lines and in which a wedge-shaped member 8 is axially displaceable. This wedge-shaped member 8 is rigidly connected with a support shaft 9 displaceable in the interior of the hollow shaft 3. The support shaft 9 therefore rotates together with the hollow shaft 3 but is axially displaceable therein.
The closed base of a bowl-shaped centrifugal drum 11 is flange-mounted in a non-rotatable manner on the end of the hollow shaft 3 located to the left in FIGS. 1 and 2 and protruding beyond the bearing 4. The drum 11 has radially extending through openings 12 in its cylindrical casing. The drum 11 is open at its end face opposite the base. The edge of a filter cloth 15 essentially circular cylindrical in design is sealingly clamped by means of a holding ring 14 at the flange-like edge 13 of the opening surrounding this open end face. The other edge of the filter cloth 15 is sealingly connected in a corresponding manner to a base portion 16 which is rigidly connected to the displaceable support shaft 9 which penetrates freely through the base of the centrifugal drum 11.
A centrifugal chamber lid 18 is rigidly attached to the base portion 16 via spacer bolts 17, leaving an intermediate space free. This lid, in FIG. 1, hermetically seals the centrifugal chamber of the drum 11 by engaging on the edge of its opening and, in FIG. 2, is lifted freely away from the drum 11, together with the base portion 16, by axial outward displacement of the support shaft 9 out of the hollow shaft 3.
A feed pipe 19 is arranged at the front end of the sleeve filter centrifuge located to the left in FIGS. 1 and 2. This pipe serves to supply a suspension to the centrifugal chamber of the drum 11 which is to be separated in
REFERENCES:
patent: 4193874 (1980-03-01), Gerteis
patent: 5169525 (1992-12-01), Gerteis
Dawson Robert A.
Heinkel Industriezentrifugen GmbH & Co.
Reifsnyder David
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