Sleeve filter centrifuge

Liquid purification or separation – With repair or assembling means

Patent

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Details

210370, 2103801, B01D 33067

Patent

active

052863786

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a sleeve filter centrifuge comprising a drum rotatably mounted in a housing and having radial filtrate passages, an invertable filter cloth covering the filtrate passages, a cover closing one end face of the drum, a feed opening for the suspension to be filtered provided in the cover, a feed pipe passing through the feed opening, and a safety device preventing the drum being opened by the cover being detached from it for as long as the drum is rotating at a rotational speed higher than a critical rotational speed, above which any opening of the drum would be dangerous, drum and cover being axially displaceable relative to one another by means of a rotatably driven hollow shaft and a support shaft telescopically reciprocating therein in order to invert the filter cloth.
The object of the invention is to improve a sleeve filter centrifuge of the generic type in a simple manner and without using a centrifugal governor so that the drum can only be opened when its rotational speed is below a predetermined value.
The object is accomplished in accordance with the invention in that a screw spindle is arranged on the support shaft and a nut engaging with this screw spindle is provided, that either the screw spindle or the nut is rotatingly drivable by a motor so that the support shaft reciprocates telescopically in the hollow shaft in response to the rotational speed of the screw spindle or the nut relative to the rotational speed of hollow shaft and drum, the drum opening when the rotational speed of the screw spindle or nut driven by the electromotor is higher than the rotational speed of the hollow shaft, and closing when the rotational speed of the screw shaft or the nut is lower than the rotational speed of the hollow shaft, and that the maximum rotational speed of the motor is selected such that the maximum rotational speed it imparts to the screw spindle or nut is lower than the critical rotational speed of the drum so that the drum opens only when it is rotated at a rotational speed lower than the critical rotational speed.
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 the 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 discharging solids;
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

REFERENCES:
patent: 4193874 (1980-03-01), Gerteis
patent: 4543184 (1985-09-01), Hoffmann et al.

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