Abstract:
Die Erfindung betrifft eine Zentrifuge, insbesondere Vollmantel-Schneckenzentrifuge mit axialem Suspensionzuführrohr (9), das in eine mit Auslassöffnungen (5) versehene Aufgabekammer (4) der Zentrifuge mündet. Sie ist vornehmlich dadurch gekennzeichnet, dass die Auslassöffnungen (5) mit gekrümmten Aufsätzen (8) ur Umlenkung der Suspension ausgestaltet sind. Auch betrifft die Erfindung eine Aufsatz zum Einsatz bei Zentrifugen. Durch die Erfindung lässt sich ein sanfter Eintrag der Suspension in den Teich erzielen, wodurch die Gefahr von Kornbrüchen bei körnigen Suspensionen stark verringert wird.
Abstract:
Die Schneckenzentrifuge dient zum kontinuierlichen Trennen fließiahiger Stoffe unterschiedlicher Dichte und hat eine Rotortrommel (14) mit in einem konischen Abschnitt (20) der Rotorwand angeordneten Austragsöffnungen (54) für die schwere Phase (56) und mit an einer die Rotortrommel (14) abschließenden Stirnwand (46) vorgesehenen Wehröffnungen (48) für die leichte Phase (50), eine innerhalb der Rotortrommel (14) drehbare Förderschnecke (22) mit an einer Hohlwelle (28) angebrachter Schneckenwendel (26) für den Transport der schweren Phase (56) zu den Austragsöffnungen (54) sowie ein koaxial innerhalb der Hohlwelle (28) angeordnetes Gemisch-Zulaufrohr (30), das zu einer in der Hohlwelle (28) ausgebildeten Aufgabekammer (42) iührt, von der Aufgabeöffnungen (44) zu der Schneckenwendel (26) iühren. In Förderrichtung (32) des Zulaufrohres (30) ist vor der Aufgabekammer (42) ein Luftabsaugorgan (58) vorgesehen ist, das in dem das Zulaufrohr (30) einschließenden Ringraum (38) eine zur Förderrichtung (32) im Zulaufrohr (30) gleichgerichtete Saugströmung erzeugt. Das Luftabsaugorgan (58) kann in vorteilhafter Weise als Laufradteil (62) einer Kreiselpumpe ausgebildet sein.
Abstract:
A centrifuge (500) for separating feed material into solid and fluid parts, which centrifuge comprises a conveyor (540) rotatably mounted in a rotatable housing (520), the conveyor having at least one impeller (572) and the rotatable housing having a separating region comprising a pool area and a drying area between the conveyor and a rotatable housing, the arrangement being such that, in use, on entry to the centrifuge said feed material has an axial velocity substantially parallel to the longitudinal axis thereof, the feed material passing through the interior of said conveyor (540) with rotational speed being imparted thereto by said at least one impeller (572) prior to treatment in said separating region, said at least one impeller also imparting radial speed to said feed material whilst it moves with axial velocity such that feed material is spread onto the drying area adjacent the length of the at least one impeller, part of the conveyor (540) being liable to wear by feed material moving from the at least one impeller onto the drying area, characterised in that said conveyor comprises a mounting apparatus (580) for (1) providing mechanical integrity to the conveyor and (2) providing a portion to be sacrificed by said wear, the arrangement being such that, in use, the mechanical integrity of the centrifuge is substantially unimpaired by sacrifice of said portion.
Abstract:
A conveyor (40) for a centrifuge (10; 210), the conveyor comprising a thread (41), a support (49) therefor, and a plurality of open areas (51) that (a) extend along a substantial portion of the length of the support and (b) through which feed material to be treated by the centrifuge (10; 210) can pass.
Abstract:
A feed accelerator system for use in a centrifuge comprising a concentrically mounted accelerator (28) including a plurality of spaced disc members (29, 41) one disc including a target surface (37) having no sharp bends, and a feed pipe (34) discharging near the target surface (37). The disc members (29, 41) having vanes (39) therebetween forming a plurality of feed channels. The above parts interrelated to provide minimum feed splashback, uniform feed distribution and circumferential flow uniformity, maximum feed acceleration and maximum centrifuge separation efficiency.
Abstract:
The centrifugal separator has a rotating bowl (3) and a rotating conveyor (5) with an acceleration chamber (43) arranged coaxially within the bowl (3). The centrifugal separator further has a separation chamber (45), which is radially limited by the bowl (3) and the conveyor (5), respectively, and the acceleration chamber is provided with feed ports for inlet of feed material into the separation chamber (45). A feed accelerator is arranged coaxially within the acceleration chamber (43) and is rotating in use around a common axis of rotation relative to the conveyor at a lower speed than the conveyor. The feed accelerator has a discharge outlet for discharge of feed material into the acceleration chamber (43) of the conveyor. The feed ports extend a first axial area (49) and the discharge outlet extends a second axial area (82), whereby the first and the second axial area are overlapping.
Abstract:
A screw conveyor (2) intended and formed for use in a decanter centrifuge for separation of solid particles from a fluid compound, comprising a central body (10), at least one conveyor thread (11a; 11b) and at least one baffle (12) bridging a flow path formed between different parts of the conveyor thread. The screw conveyor (2) has at least two originally separate parts (22, 23), each of which comprises a portion of said conveyor thread (11a; 11b) and which are kept together axially. The baffle (12) constitutes a separate member arranged to be kept in place between said parts (22, 23) of the screw conveyor, when these parts are kept together axially, and has a portion (26; 27) which forms a part of the conveyor thread (11a; 11b) in an area where the conveyor thread intersects with and extends past the baffle (12).
Abstract:
Improved centrifugal decanters with a screw conveyor for the continuous separation of solids-liquid mixtures are disclosed wherein the conveying means (18) is provided with a coaxially mounted feed distributor (38), generally trunco-conical in form, adapted to distribute into the conveying means, a solids-liquid feed stream falling into the distributor from a short stationary feed tube (20). The invention includes processes which use such improved centrifuge apparatus for continuous separation of solids-liquid into separate components by centrifugal action.
Abstract:
A liquid accelerator system for use in a centrifuge, the system comprising a conveyor hub (26) rotatable mounted within a rotating bowl, the hub including an inside surface and an outside surface. At least one feed slurry or wash liquid passageway (44) is disposed between the inside surface of the conveyor hub and the outside surface of the conveyor hub. A plurality of outwardly extending extensions (84 and 200) are associated with each passageway. In the preferred embodiment, the extensions are U-shaped channels (84) and full channels (200). A plurality of partitions extends in a circumferential direction from the discharge end of each U-shaped channel (84) and each full channel (200) so as to form a plurality of discharge channels. A flow directing and overspeeding vane (146) is disposed within each discharge channel.
Abstract:
A feed accelerator system for use in a centrifuge, the system comprising a conveyor hub (26) rotatably mounted substantially concentrically within a rotating bowl (12), the conveyor hub (26) including at least one passageway (44) connecting an inside surface of the conveyor hub (26) to an outside surface of the conveyor hub (26) for a feed slurry (32) exiting the conveyor hub. The passageway (44) may be associated with a variety of feed slurry accelerator enhancements, such as a baffle (58) extending into a slurry pool (40) formed on the inside of the conveyor hub (26), a divider (68), a U-shaped channel (84), an extension tube (94), and/or a flow directing and overspeeding member (78). These accelerator enhancements may be combined within the passageway or incorporated into a feed slurry accelerating nozzle apparatus removably secured to the passageway. The passageway and/or the nozzle apparatus may include a cross-sectional area having a longer axis approximately parallel to the conveyor hub axis of rotation. Any of these feed slurry accelerator enhancements may include a wear resistant material.