EP0520010B1 - Dekanterzentrifuge - Google Patents
Dekanterzentrifuge Download PDFInfo
- Publication number
- EP0520010B1 EP0520010B1 EP91906597A EP91906597A EP0520010B1 EP 0520010 B1 EP0520010 B1 EP 0520010B1 EP 91906597 A EP91906597 A EP 91906597A EP 91906597 A EP91906597 A EP 91906597A EP 0520010 B1 EP0520010 B1 EP 0520010B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- inlet
- end wall
- projection
- decanter centrifuge
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B2001/2033—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with feed accelerator inside the conveying screw
Definitions
- the invention relates a decanter centrifuge comprising a rotatably journalled drum having at one end outlet openings for the separated liquid phase, and a conveyor rotatably journalled in the drum with a conveyor body containing an inlet in the form of a cavity for the feed to be separated, said inlet being radially defined by a wall coaxial with the conveyor body and provided with inlet apertures located between two adjacent flights of the conveyor and connecting the inlet with the space between the conveyor body and the internal side of the drum, the inlet being axially defined by a rotationally symmetrical first end wall and a second end wall located opposide the first end wall, said second end wall having a central projection extending towards the first end wall and containing an axial bore for an inlet pipe for the feed, said inlet pipe being coaxial with the drum, and having a mouth facing the inlet and being located in the plane perpendicular to the axis of the drum.
- US patent No. 3.428.246 describes a decanter centrifuge of the above type where accumulation of solids in the inlet and resulting erosion of the inlet pipe is avoided by means of radial ribs on the first end wall in the peripheral area at the inlet openings, a second end wall shaped as an inclined baffleplate, a deflecter assembly on the inlet pipe and the projection on the second end wall, and outlet openings for the separated liquid located at a radius which is greater than the radius to the inlet openings.
- EP patent application No. 0.177.838 describes a decanter centrifuge in which a flocculant is added to the feed in the area between the first end wall and the outlet openings.
- the flocculant is supplied under pressure through a nozzle and the feed flow is partly penetrated by the flocculant.
- the feed flow shown in the drawing indicates that the outlet openings for the separated liquid is located radially further out than the inlet openings in the inlet.
- the outlet openings for the liquid phase are located radially inwards of the inlet openings, such that the liquid phase partly fills the inlet.
- the purpose is to effect separation of the solids within the inlet.
- the second end wall is reduced to a set of spokes carrying one end of the tubular conveyor body, in order to permit the liquid phase to escape from the inlet directly to the outlet openings.
- the decanter centrifuge according to the invention differs from the prior art in that the mouths of the inlet apertures in the inlet are located on a radius greater than the radius to the outlet openings, that a peripheral area of the inlet outwardly defined by the radius to the inlet apertures is free of carriers, inwards extending projections or the like, that the second end wall is rotationally symmetrical and that the projection of the second end wall has the shape of a truncated cone whose pointed end faces the first end wall.
- the feed flowing through the inlet pipe is led as a jet directly towards the first end wall where it divides and flows towards the radially confining wall of the inlet.
- the wall includes no members contributing to rotating the feed, merely a torque is transferred to the feed determined by the friction between the feed and the internal side of the end wall.
- the angular velocity of the feed in the inlet may therefore be kept substantially lower than the angular velocity of the conveyor body.
- the free liquid surface in the inlet will therefore be positioned on a considerably smaller radius than the radius to the outlet openings.
- the flow in the inlet when the decanter centrifuge has attained its normal operating condition, mainly passes in the direction from the first end wall and parallel to the free surface in the inlet towards the second end wall and a uniform outflow is concurrently effected through the inlet apertures.
- the feed approaches the inlet apertures it has by and large attained the same angular velocity as the conveyor body, but due to the comparatively long path of flow in the thick liquid layer in the inlet, the excess energy has been disspipated in a manner as to prevent the occurrence of turbulent flows which are entrained through the inlet apertures into the space between the conveyor body and the internal side of the drum.
- any air occurring in the feed or being entrained by the feed while flowing into the inlet may be passed away along the periphery of the projection of the second end wall, thereby preventing an air cushion from occurring in the inlet which may interfere in the intended flow.
- any liberated air will flow along the periphery of the projection and leave the inlet through the axial bore in the projection.
- the projection of the second end wall may have substantially radial, longitudinal ribs uniformly distributed along the periphery of the projection, or there may be one or more substantially radial ribs following helices along the periphery of the projection.
- a larger momentum is thus transferred to the liquid in the inlet in case the free liquid surface approaches the periphery of the projection, e.g. because the rate of flow of the feed increases.
- the flow may be directed more strongly towards the second end wall, thereby obtaining an improved axial distribution of the feed, and by altering the radial extension of the ribs it is possible to obtain that the free surface of the liquid does not approach such a small radius that the liquid may discharge through the bore of the inlet pipe in the projection.
- An alternative preferred embodiment is characterized in that the first end wall centrally includes a baffle knob protruding towards the inlet pipe. This provides for obtaining an improved control of the inflowing feed when it changes from being an axial flow to being a radial flow because such a sudden change in direction is prevented.
- the baffle knob may have radial ribs uniformly distributed along the periphery of the baffle knob.
- the ribs may extend along straight lines or helical lines. This may be necessary in order to impart a sufficient rotation to the feed in the inlet with the view of obtaining a stable circulation flow in the inlet.
- the inlet may be provided in an exchangeable part of the conveyor body and the baffle knob may be exchangeably secured to the first end wall and the projection containing the axial bore of the inlet pipe may be exchangeably secured to the second end wall. It is obtained by these measures that one and the same decanter centrifuge may be used for various types of feed, in that one or more of said components is/are exchanged.
- the inlet pipe may be axially displaceable. It is thus obtained that the diameter of the jet at the baffle knob may be altered by displacement of the inlet pipe, thereby making it possible to adapt the flow in the inlet to the type of feed and/or the rate of flow thereof.
- the decanter centrifuge illustrated in Fig. 1 includes a drum 1, rotatably journalled in bearings 22 at each end.
- a conveyor 2 is rotatably journalled in drum 1 in relation to the drum by means of bearings 23 at each end.
- Conveyor 2 comprises a conveyor body 3 with an external helical flight 21.
- the conveyor body 3 includes an inlet 4 axially defined by a first end wall 11 and a second end wall 13.
- Inlet 4 is radially defined by a wall 5 that is coaxial with the conveyor body 3 and comprises inlet apertures 6 connecting the inlet 4 with the space 7 between the conveyor body 3 and the internal side of drum 1.
- the decanter centrifuge further inlcudes an inlet pipe 8 having a mouth 16 directed towards inlet 4.
- Fig. 2 illustrates inlet 4 with the end wall 11 having centrally a baffle knob 12, in this embodiment shaped as an approximately spherical face smoothly merging into end wall 11 which per se constitutes a smooth transition to the radially confining wall 5.
- the second end wall 13 has a projection 14 which includes a bore 15 for inlet pipe 8 and is coaxial with the drum axis.
- Projection 14 has the shape of a truncated cone whose small end faces the baffle knob.
- At the large end projection 14 merges smoothly into end wall 13 which per se merges smoothly into wall 5.
- Six, substantially radial, slightly helical, longitudinal ribs 17 uniformly distributed along the periphery of the projection are positioned on the periphery of projection 14.
- inlet pipe 8 The mouth of inlet pipe 8 is situated in a plane perpendicular to the drum axis. Inlet pipe 8 is axially displaceable, thereby allowing the distance between mouth 16 and baffle knob 12 to be varied. The adjustment of this distance may according to choice be effected during operation and the variation of the distance may be effected manually or automatically by means of a control mechanism, not shown.
- the radial wall 5 is provided with inlet apertures 6 all of which are positioned between the helical flight 21.
- the apertures are, moreover, provided uniformly across the entire axial extension of wall 5. The liquid may then flow freely from the inlet through the inlet apertures into space 7 without passing members capable of provoking turbulence and vortices.
- Fig. 3 illustrates the flow paths in the inlet.
- dashed lines the upper half of the figure shows various characteristic flow areas through which the feed flows when passing the inlet.
- the path of the feed through the inlet may be described as follows.
- the feed leaves inlet pipe a and continues in a jet towards baffle knob 12 at which it is radially dispersed between the baffle knob and a vortex area 31 located at the free liquid surface.
- the feed subsequently passes into an agitation zone 30 in which a mixing is effected with liquid from a radially external area 33 of the inlet, thereby increasing the angular velocity of the feed.
- Said angular velocity is somewhat smaller than the angular velocity in the adjacent zone 33, the so-called dissipation area, and the feed will therefore be forced back towards the liquid surface in the direction towards the radial outer edges of ribs 17.
- the liquid in this area is imparted an angular acceleration preventing the liquid from penetrating further towards projection 14.
- the ribs are slightly helical, thereby forcing the liquid towards end wall 13.
- the feed attains the same angular velocity as the ribs whereas the excess energy brought about by this acceleration occurs as a radial velocity carrying the feed into the disspipation area 33 throughout the length of projection 14.
- the three inlet apertures 6 are positioned between the flights so that there are no edges capable of imparting turbulence or retaining threads or similar bigger particles in the feed.
- the apertures are so large that they do not form any restriction to the flow and as they follow the flights they are axially displaced in relation to each other and cover almost the entire length of the circularly cylindrical wall 5.
- the inlet illustrated in Fig. 4 has ribs 17 that are helically positioned along the circumference of projection 14. Such ribs provoke a stronger flow in the area of acceleration 32 towards end wall 13 than the ribs 17 shown in Fig. 3.
- Six inlet apertures 6 all of which are positioned between the screw flights 21 are provided in this latter embodiment of the inlet.
- the inlet illustrated in Fig. 5 has an end wall 11 with an angular projection 20 which on the radially internal and external side of the projection merges smoothly into end wall 11.
- Fig. 6 illustrates an inlet substantially designed as the inlet in Fig. 2, but the inlet portion proper is designed as a separate component joined with conveyor body 3 by bolts 25 and flanges on the conveyor body.
- Baffle knob 12 is also designed as a separate component fixedly bolted on end wall 11 by means of a central bolt 26.
- Projection 14 is likewise designed as a separate component which through bolts 27 is fixedly bolted on end wall 13.
- the described inlet offers great possibilities of varying the size and the shape of the various members concerned with the view of obtaining an optimum yield.
- the radius of the inlet may be altered only within narrow limits, but it is possible to extend the inlet in the axial direction.
- an extension of the inlet generally implies that projection 14 has to be extended too, because it is necessary to control the internal surface of the liquid in the inlet in order to ensure that it does not penetrate so far towards the axis of rotation that the liquid discharges through bore 15 in the projection.
- inlet apertures 6 of a long inlet are uniformly distributed throughout wall 5, there is a risk that part of the feed will only have a short path through the inlet before passing an inlet aperture and penetrating into space 7. In such a case it may be advantageously to make use of an end wall 11 with an annular projection 20, as illustrated in Fig. 5.
- ribs 17 throughout a large span of flow rates is to prevent overflow through bore 5, to impart angular velocity to the feed and to distribute the feed axially throughout the entire inlet, thereby enabling excess energy originating from the acceleration to dissipate throughout the entire dissipation area 33 of the inlet.
- the axial extension of ribs 17 must therefore be adapted to the axial length of the inlet.
- the ribs 17 should, however, cover the area at the inlet apertures. Radially the ribs must be positioned on the smallest possible radius, in respect of the diameter of the inlet pipe and also of the bore 15, and the length and also the strength of projection 14.
- the individual rib may extend completely axially, at a constant angle in relation to the axis of rotation or at a variable angle in relation to the axis.
- the angle in relation to the axis caters for the axial distribution of the feed throughout the dissipation area 33 and must be adapted to the rate of flow, the type of feed to be separated and the axial extension of ribs 17 and inlet 4, as mentioned above.
- the ribs are designed so that hair and threads in the feed do not settle and cling to edges but are thrown off.
- the purpose of the baffle knob is to alter the direction of the feed so that it is carried into the agitation area 30 with a minimum interference with the free surface of the feed in the inlet and so as to obtain a uniform distribution across the surface of end wall 11.
- ribs 17 on projection 14 do not result in the desired rotation there may, as illustrated in Fig. 6, be provided radial ribs 19 uniformly distributed along the periphery of the baffle knob and following straight lines, as shown in Fig. 7, or helices, as shown in Fig. 8. Said ribs should likewise be shaped so that hair and threads do not settle.
- inlet apertures 6 By passing through inlet apertures 6 into space 7, a small acceleration is imparted to the feed, as mentioned above. With the view of reducing this supplementary acceleration, it is advantageous that the thickness of material in the area at the inlet apertures is as small as allowed by the considerations relating to strength and wear.
- decanter centrifuges having rotating inlet pipes journalled within the conveyor body, means of ensuring that the inlet may be vented through the bearing should be provided.
- a decanter centrifuge it is possible to further improve the separation by establishing partial vacuum in the inlet by exhaustion.
- Such a partial vacuum reduces the energy to be dissipated, some of the excess energy being in this case used to compensate for the partial pressure.
Landscapes
- Centrifugal Separators (AREA)
Claims (12)
- Dekantierzentrifuge umfassend eine rotierbar gelagerte Trommel (1), die an einem Ende Auslassöffnungen (9) für die abgeschiedene Flüssigkeitsphase aufweist, und eine in der Trommel rotierbar gelagerte Schnecke (2) mit einem Schneckenkörper, der einen als Hohlraum ausgebildeten Einlauf (4) für das abzuscheidende Zufuhrmaterial aufweist, welcher Einlauf (4) radial durch eine mit dem Schneckenkörper koaxiale Wand (5) abgegrenzt ist, die zwischen zwei benachbarten Schneckenwindungen der Schnecke angeordnete Einlassöffnungen (6) hat, welche den Einlauf (4) mit dem zwischen dem Schneckenkörper (3) und der Innenseite der Trommel (1) liegenden Raum (7) verbinden, wobei der Einlauf (4) von einer rotationssymmetrischen ersten Endwand (11) und einer der ersten Endwand (11) gegenüberliegenden zweiten Endwand (13) axial abgegrenzt ist, und die zweite Endwand (13) einen in Richtung zur ersten Endwand (11) verlaufenden zentralen Vorsprung (14) mit einer axialen Bohrung (15) für ein Einlaufrohr (8) für das Zufuhrmaterial aufweist, welches Einlaufrohr (8) koaxial mit der Trommel ist und eine dem Einlauf zuwendende und in einer Ebene rechtwinkelig zur Trommelachse liegende Mündung (16) hat, dadurch gekennzeichnet, dass die Mündungen der Einlauföffnungen (6) im Einlauf (4) auf einem Radius liegen, der grösser ist als der Radius zu den Auslauföffnungen (9), dass der Peripheriebereich des Einlaufs (4), der nach aussen vom Radius zu den Einlauföffnungen (6) abgegrenzt ist, frei von Mitnehmern, nach innen verlaufenden Vorsprüngen und dergleichen ist, dass die zweite Endwand (13) rotationssymmetrisch ist, und dass der Vorsprung (14) der zweiten Endwand (13) die Form eines Kegelstumpfes hat, dessen spitzes Ende der ersten Endwand (11) zuwendet.
- Dekantierzentrifuge nach Anspruch 1, dadurch gekennzeichnet, dass der Vorsprung (14) der zweiten Endwand (13) eine im wesentlichen radiale Rippe (17) aufweist, die einer Schraubenlinie entlang der Peripherie des Vorsprungs folgt.
- Dekantierzentrifuge nach Anspruch 1, dadurch gekennzeichnet, dass der Vorsprung (14) der zweiten Endwand (13) mehrere, im wesentlichen radiale Rippen (17) aufweist, die Schraubenlinien entlang der Peripherie des Vorsprungs folgen.
- Dekantierzentrifuge nach Anspruch 1, dadurch gekennzeichnet, dass der Vorsprung (14) der zweiten Endwand (13) mit im wesentlichen radialen, in der Längsrichtung verlaufenden Rippen (17) versehen ist, die entlang der Peripherie des Vorsprungs gleichmässig verteilt sind.
- Dekantierzentrifuge nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in der Mitte der ersten Endwand (11) ein in Richtung zum Einlaufrohr (8) vorspringender Anprallknopf (12) vorgesehen ist.
- Dekantierzentrifuge nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Anprallknopf (12) im wesentlichen radiale Rippen (17) aufweist, die entlang der Peripherie des Anprallknopfes gleichmässig verteilt sind.
- Dekantierzentrifuge nach Anspruch 6, dadurch gekennzeichnet, dass die im wesentlichen radialen Rippen des Anprallknopfes (12) Schraubenlinien entlang der Peripherie des Anprallknopfes folgen.
- Dekantierzentrifuge nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erste Endwand (11) einen dem Einlaufrohr (8) zuwendenden ringförmigen Vorsprung (20) aufweist.
- Dekantierzentrifuge nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Schneckenkörper (3) einen auswechselbaren Teil (24), in welchem der Einlauf (4) angeordnet ist, umfasst.
- Dekantierzentrifuge nach den Ansprüchen 5-9, dadurch gekennzeichnet, dass der Anprallknopf (12) an die erste Endwand (11) auswechselbar befestigt ist.
- Dekantierzentrifuge nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Vorsprung (14), der die axiale Bohrung (15) für das Einlaufrohr (8) enthält, an die zweite Endwand (13) auswechselbar befestigt ist.
- Dekantierzentrifuge nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Einlaufrohr (8) axial verschiebbar ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK651/90 | 1990-03-13 | ||
DK65190A DK170967B1 (da) | 1990-03-13 | 1990-03-13 | Dekantercentrifuge |
PCT/DK1991/000075 WO1991013686A1 (en) | 1990-03-13 | 1991-03-12 | Decanter centrifuge |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0520010A1 EP0520010A1 (de) | 1992-12-30 |
EP0520010B1 true EP0520010B1 (de) | 1994-10-19 |
Family
ID=8095996
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91906597A Expired - Lifetime EP0520010B1 (de) | 1990-03-13 | 1991-03-12 | Dekanterzentrifuge |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0520010B1 (de) |
JP (1) | JP2987519B2 (de) |
DE (1) | DE69104715T2 (de) |
DK (1) | DK170967B1 (de) |
WO (1) | WO1991013686A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004110637A1 (en) * | 2003-06-18 | 2004-12-23 | Alfa Laval Corporate Ab | A screw conveyor for a decanter centrifuge |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5354255A (en) * | 1992-12-17 | 1994-10-11 | Alfa Laval Separation Inc. | Decanter centrifuge with conveyor capable of high speed and higher flow rates |
DE19738128A1 (de) * | 1997-09-01 | 1999-03-11 | Rolf Dipl Ing Schnause | Verfahren und Vorrichtung zum Zentrifugieren von viskosen Fluiden, insbesondere viskosen Kunststoffschmelzen |
US6780147B2 (en) * | 2000-08-31 | 2004-08-24 | Varco I/P, Inc. | Centrifuge with open conveyor having an accelerating impeller and flow enhancer |
US6790169B2 (en) * | 2000-08-31 | 2004-09-14 | Varco I/P, Inc. | Centrifuge with feed tube adapter |
US6561965B1 (en) | 2000-10-20 | 2003-05-13 | Alfa Laval Inc. | Mist pump for a decanter centrifuge feed chamber |
DE102006011452B4 (de) * | 2006-03-13 | 2014-02-13 | Flottweg Se | Zentrifuge mit einem Einlaufrohr |
KR100977196B1 (ko) | 2008-09-26 | 2010-08-23 | 주식회사 로얄정공 | 스크류 컨베이어에 형성된 이단가속 토출커버를 구비한 스크류데칸터형 원심분리기 |
KR101231066B1 (ko) | 2012-07-18 | 2013-02-07 | 주식회사 천보엔지니어링 | 막힘방지구조의 분배실을 구비한 원심탈수장치 |
DE102020008152A1 (de) | 2020-11-09 | 2022-06-23 | Flottweg Se | Zentrifugenschnecke und Vollmantelschneckenzentrifuge |
DE102020129483B3 (de) | 2020-11-09 | 2022-05-25 | Flottweg Se | Zentrifugenschnecke und Vollmantelschneckenzentrifuge |
IT202100000035A1 (it) * | 2021-01-04 | 2022-07-04 | Schlumberger Technology Corp | Centrifughe decanter e condotti di accelerazione e procedimenti associati |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3143504A (en) * | 1960-01-05 | 1964-08-04 | Krupp Dolberg Gmbh | Solid-bowl centrifuge with discharge screw |
DE1119173B (de) * | 1960-06-25 | 1961-12-07 | Krauss Maffei Ag | Zentrifuge mit Austragschnecke |
DE1215606B (de) * | 1963-01-31 | 1966-04-28 | Beteiligungs & Patentverw Gmbh | Vorrichtung zum Vermischen von Flockungsmitteln mit Schlaemmen in Absetzzentrifugen |
US3428246A (en) * | 1967-12-21 | 1969-02-18 | Pennsalt Chemicals Corp | Centrifuge apparatus |
FR2057600A5 (en) * | 1969-08-29 | 1971-05-21 | Saget Pierre | Centrifuge with modified solids discharge - conveyor |
DE3444349A1 (de) * | 1984-10-10 | 1986-04-10 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Vorrichtung zum einbringen von flockungsmitteln in den schlamm innerhalb der einlaufkammer einer zentrifuge |
-
1990
- 1990-03-13 DK DK65190A patent/DK170967B1/da not_active IP Right Cessation
-
1991
- 1991-03-12 EP EP91906597A patent/EP0520010B1/de not_active Expired - Lifetime
- 1991-03-12 JP JP3506758A patent/JP2987519B2/ja not_active Expired - Fee Related
- 1991-03-12 DE DE69104715T patent/DE69104715T2/de not_active Expired - Fee Related
- 1991-03-12 WO PCT/DK1991/000075 patent/WO1991013686A1/en active IP Right Grant
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004110637A1 (en) * | 2003-06-18 | 2004-12-23 | Alfa Laval Corporate Ab | A screw conveyor for a decanter centrifuge |
US7229399B2 (en) | 2003-06-18 | 2007-06-12 | Alfa Laval Corporate Ab | Screw conveyor for a decanter centrifuge |
Also Published As
Publication number | Publication date |
---|---|
JP2987519B2 (ja) | 1999-12-06 |
WO1991013686A1 (en) | 1991-09-19 |
EP0520010A1 (de) | 1992-12-30 |
JPH05505557A (ja) | 1993-08-19 |
DK65190A (da) | 1991-09-14 |
DE69104715T2 (de) | 1995-05-04 |
DE69104715D1 (de) | 1994-11-24 |
DK170967B1 (da) | 1996-04-09 |
DK65190D0 (da) | 1990-03-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5374234A (en) | Decanter centrifuge with energy dissipating inlet | |
EP0520010B1 (de) | Dekanterzentrifuge | |
US6024874A (en) | Hydrocyclone separator | |
CA2419997C (en) | Conveyor for a centrifuge and method of separation | |
JP3473974B2 (ja) | デカンター型遠心分離装置 | |
EP0613401B2 (de) | Zufuhrbeschleunigungssystem mit beschleunigungskegel | |
US20100282884A1 (en) | Agitator mill | |
US6780147B2 (en) | Centrifuge with open conveyor having an accelerating impeller and flow enhancer | |
US4245777A (en) | Centrifuge apparatus | |
US5403486A (en) | Accelerator system in a centrifuge | |
GB2026352A (en) | Solids liquid separating centrifuge with solid classification | |
JPS59142877A (ja) | 空気分級機 | |
CA2124440C (en) | Feed accelerator system including accelerator disc | |
KR0148400B1 (ko) | 미세입자로 된 고체물질을 두 입자부분으로 분리하는 방법 및 장치 | |
KR890001390B1 (ko) | 입상물질 분리기 | |
US5234400A (en) | Method and apparatus for the separation, particularly classification of a solids/liquid mixture | |
US5651756A (en) | Feed accelerator system including feed slurry accelerating nozzle apparatus | |
US3682302A (en) | Air separator | |
US6109448A (en) | Vertical-axis air classifier | |
US2988220A (en) | Turbo-classifier | |
SE502308C2 (sv) | Kontinuerligt arbetande centrifugtrumma för koncentrering av suspenderade fasta partiklar | |
US4106117A (en) | Apparatus for mixing particulate material in a liquid | |
NZ198677A (en) | Pulveriser with classifier | |
SU1132985A1 (ru) | Гидроциклон | |
GB2143752A (en) | Centrifugal separation |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19920824 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE SE |
|
17Q | First examination report despatched |
Effective date: 19940211 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE SE |
|
REF | Corresponds to: |
Ref document number: 69104715 Country of ref document: DE Date of ref document: 19941124 |
|
EAL | Se: european patent in force in sweden |
Ref document number: 91906597.9 |
|
PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
26 | Opposition filed |
Opponent name: KLOECKNER-HUMBOLDT-DEUTZ AG PATENTE, MARKEN UND LI Effective date: 19950715 |
|
PLBF | Reply of patent proprietor to notice(s) of opposition |
Free format text: ORIGINAL CODE: EPIDOS OBSO |
|
PLBO | Opposition rejected |
Free format text: ORIGINAL CODE: EPIDOS REJO |
|
PLBN | Opposition rejected |
Free format text: ORIGINAL CODE: 0009273 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: OPPOSITION REJECTED |
|
27O | Opposition rejected |
Effective date: 19960830 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20080314 Year of fee payment: 18 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20080313 Year of fee payment: 18 |
|
EUG | Se: european patent has lapsed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091001 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090313 |