US3831764A - Pusher-type centrifuge - Google Patents

Pusher-type centrifuge Download PDF

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Publication number
US3831764A
US3831764A US36727473A US3831764A US 3831764 A US3831764 A US 3831764A US 36727473 A US36727473 A US 36727473A US 3831764 A US3831764 A US 3831764A
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United States
Prior art keywords
annular
passageway
feed
tapered portion
annular structure
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Expired - Lifetime
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English (en)
Inventor
D Humphrey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alfa Laval AB
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Pennwalt Corp
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Publication date
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Priority to US36727473 priority Critical patent/US3831764A/en
Priority to JP5501974A priority patent/JPS5713344B2/ja
Application granted granted Critical
Publication of US3831764A publication Critical patent/US3831764A/en
Assigned to ALFA-LAVAL AB, GUSTAVSLUNDSVAGEN-147, ALVIK, STOCKHOLM, SWEDEN, A CORP. OF SWEDEN reassignment ALFA-LAVAL AB, GUSTAVSLUNDSVAGEN-147, ALVIK, STOCKHOLM, SWEDEN, A CORP. OF SWEDEN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PENNWALT CORPORATION, A PA CORP.
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
    • B04B3/02—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by means coaxial with the bowl axis and moving to and fro, i.e. push-type centrifuges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/2065—Responsive to condition external of system

Definitions

  • Annular structure is provided outwardly of the accelerator vanes in the annular feed passageway of a pusher centrifuge.
  • the annular structure recombines vinto an annular stream the subdivided feed streams flowing outwardly of the accelerator vanes, thereby reducing abrasive wear on the screen of the inner rotor.
  • centrifuge apparatus of the pusher type for separating solids and liquid from a mix- .ture thereof.
  • Such centrifuge apparatus comprises a BACKGROUND OF THE INVENTION
  • An example of pusher-type centrifuges to which the present invention is applied is shown and described in US. Pat. No. 3,136,722, which issued June 9, I964 to Fred P. Gooch.
  • Such centrifuges are provided with an annular passageway of frusto-conical configuration for conducting feed outwardly of the rotational axis of the inner rotor toward the small end of a tapered portion of the inner rotor. Accelerator vanes in the passageway rotate with the inner rotor to impart angular acceleration to the feed as it moves outward.
  • the feed flows toward the accelerator vanes as an annular stream and it is subdivided into a number of radially outwardly directed streams by the accelerator vanes.
  • the subdivided streams jet against the screen surface of the inner rotor. Since such streams contain solids, usually crystals, the same spaced portions of the rotor screen are always abraded by the feed streams. As a result, the screen of the conventional inner rotor wears away rapidly and must be replaced frequently.
  • the present invention is directed to an improvement which delivers the feed to the inner rotor as a more uniformly distributed, recombined annular stream which is less abrasive to the screen of the inner rotor. Longer screen life is thereby achieved.
  • annular structure is provided outwardly of the accelerator vanes in the annular feed passageway. It is the function of the annular structure to intercept the subdivided streams of feed as they jet radially outwardly of the vanes and to recombine the subdivided streams as an annular feed stream, after which they overflow the annular structure and are evenly distributed against the screen of the inner rotor.
  • FIG. I is an elevational view, partly in vertical section, of apparatus embodying the invention.
  • FIG. 2 is an enlarged sectional view of a portion of the apparatus shown in FIG. I;
  • FIG. 3 is a horizontal sectional view of the apparatus
  • FIG. 1 an apparatus embodying the invention and generally designated 10.
  • the apparatus includes a base 12 adapted to be secured to a floor.
  • the base 12 carries a pair of spaced brackets 14 to which a shaft housing 16 is mounted.
  • Within the shaft housing 16 are a pair of aligned ball bearing units 18, the center races of which are affixed to a tubular outer rotor drive shaft 20.
  • an outer rotor 26 Connected to the left hand end of the tubular outer shaft is an outer rotor 26.
  • the connection is made to the smaller end of a frusto-conical tapered section 28 of the outer rotor 26.
  • the taperedsection 28 has a plurality of large drain openings 30 formed therein.
  • the larger end of the frusto-conical portion 28 mounts a basket or perforated cylinder 32 comprising the main portion of the outer rotor 26.
  • Formed in the basket 32 are a plurality of evenly spaced radial holes 34 communicating with a plurality of annular grooves 36 on the inner surface thereof.
  • a screen 38 (not visible in the drawings) is secured on the inner face of the cylinder 32
  • Mounted for coaxial rotation with the tubular shaft 20 is the drive shaft 40 of the inner rotor 42.
  • the shafts 20 and 40 are connected for rotation together, preferably by frictionalengagement but optionally by a suitable key (not shown).
  • the inner rotor 42 comprises a frusto-conical hub 44 and a tapered portion 46.
  • the hub is carried on the left hand end of inner shaft 40 and is secured, thereto by an axially tapered nut 48.
  • the hub 44 inclines to the right, or tapers axially to the left, as shown, and mounts the tapered portion 46 by its smaller end.
  • the tapered portion 46 is imperforate from intermediate (approximately midway), the ends thereof and the small end thereof, the remainder or imperforate section 49 of the tapered portion 46 is provided with radial drain holes 50 communicating with annular grooves 52 on its inner surface.
  • a screen 53 of frusto-conical shape is secured to the inner rotor 42 on its inner surface for the length of the perforate portion of the tapered portion 46..
  • a double-acting piston 54 which reciprocates the inner rotor 42 relative to the outer rotor 26 in axial direction, as shown by the arrows 56.
  • the piston 54 reciprocates within a cylinder 58 under fluid driving pressure.
  • Any suitable means for controlling and delivering driving fluid to the cylinder 58 for example, that disclosed in US. Pat. application of A. G. Doak and L. Shapiro, Ser. No. 248,876, filed May I, 1972, which is incorporated herein by reference.
  • the cited Doak et al. application is assigned to the assignee of the present application.
  • a cover 60 Surrounding the outer rotor 26 and anchored to the frame 12 is a cover 60. Extending inwardly from the cover 60 are a plurality of annular partitions 62 compartmenting the zone inwardly of the cover into the desired number of drain zones, each provided with a drain outlet 64. Further provided is a solids discharge outlet 66 and a liquid discharge outlet 68.
  • L-shaped feed tube 70 extends downwardly and then axially, terminating in a reduced portion further provided with an outlet having an outwardly flared distal end flange 72.
  • the flange 72 and the nut 48 are in spaced relationship, defining between them an outwardly and axially directed annular orifice 74 for the discharge of feed to an annular passageway 76.
  • acceleration shall mean tangential acceleration unless otherwise indicated.
  • Feed flowing outwardly through passageway 76 is accelerated by annularly spaced, axially extending accelerator vanes 78. Such acceleration helps to bring the feed up to the speed of the rotors 26 and 42 before it contacts the small end of the tapered portion 46. As the feed is advanced along the screen 53, liquid drains through the openings thereof, thence through the holes 50 and the openings and out the liquid discharge outlet 68.
  • Partly deliquified solids then advance to the cylinder 32 and are advanced to the open end thereof by the action of the pusher surface 80 of the reciprocating inner rotor 42.
  • Each head 82 is arranged to direct rinse liquid toward the cylinder 32 over its associated drain zone.
  • the rapidly rotating and advancing solids shed the rinse liquid and are further deliquified by centrifugal action.
  • the solids exit the outer rotor 26 by the open end of the cylinder 32 and discharge through the outlet 66.
  • An annular seal 88 is disposed between the shaft housing 16 and the outer drive shaft 20 in order to keep process material out of the bearings 18.
  • Baffle surface 90 also helps to distribute feed; and baffle 92 is provided to level the solids advancing along the screen surfaces as desired.
  • annular structure or ring 94 radially spaced from the vanes 78, is installed in the passageway 76.
  • the feed distribution shell 96 Preferably it is formed integrally with the feed distribution shell 96.
  • the latter is spaced from the hub 44 to define the frusto-conical passageway 76 and is connected by bolts 98 to the inner rotor 42 for rotation therewith.
  • the inwardly facing surface 100 of the ring 94 is smoothly finished, that is. it has no bumps, objects or other flow-impeding surfaces thereon.
  • the surface of the shell 96 facing the passageway 76 is also smoothly finished outwardly of the vanes 78. Feed accelerated by the vanes 78 is directed radially outwardly toward the inclined surface of the feed distribution shell 96.
  • the feed at this point is subdivided into a plurality of streams by the vanes 78.
  • the feed streams collect on the surface 100 of the ring 94 and there recombine into an annular stream.
  • the feed stream overflows the lip of the ring 94 in radial direction toward the imperforate section 49 of the tapered portion 46 of the inner rotor 42.
  • Such imperforate section 49 is also smoothly finished to function like the ring 94 to provide second stage reconbining of the feed into an annular stream.
  • the hub surface 102 outwardly of the vanes 78 and facing the passageway 76 is smoothly finished.
  • the ring 94 and the imperforate section 49 of the tapered portion 46 are in axially overlapping relationship to ensure that feed will overflow the ring 94 into the section 49. It is also preferred that the ring 94 project axially in the general direction of angular inclination of the passageway 76 to ensure that feed streams will be collected and recombined as an annular stream, that is, a stream of annular cross section.
  • the outwardly facing surface of the ring 94 is in mutually facing and radially spaced relationship with the surface of the section 49 to provide an annular passage leading from the passageway 76 to the screen 53.
  • the smooth surfaces previously descirbed tend to recombine the feed subdivided by the vanes into a single annular stream so that it has substantially uniform thickness throughout by the time it strikes the screen 53.
  • the improved distribution of feed reduces unbalance conditions which have been noted in conventional apparatus, expecially when more than 20 percent of the solids are -l00 mesh particle size or smaller.
  • a pusher centrifuge having inner and outer rotors arranged on a common axis for rotation at the same speed, with means for reciprocating said inner rotor relative to said outer rotor in axial direction; said outer rotor including a perforated cylinder open at one end and a perforated, tapered section connected to the other end of said cyliner, said tapered section tapering in a first axial direction away from the open end of said cylinder; said inner rotor comprising a hub at the end of said centrifuge opposite the open end of said cylinder, a tapered portion of perforate construction disposed within the tapered section of said inner rotor, said tapered portion tapering in said first axial direction and being connected at its small end to said hub, means for delivering feed for centrifugation into the interior of said inner rotor to a zone adjacent the center of said hub, an annular passageway entending outwardly from said zone to the small end of the tapered portion of said inner rotor, and a
  • a pusher centrifuge according to claim 1 wherein the end portion of said tapered portion is disposed outwardly of said annular structure at the outer end said passageway, said end portion of said tapered portion being smoothly finished and imperforate to provide a second annular surface facing said axis for reforming said feed as an annular stream.

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  • Centrifugal Separators (AREA)
US36727473 1973-06-05 1973-06-05 Pusher-type centrifuge Expired - Lifetime US3831764A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US36727473 US3831764A (en) 1973-06-05 1973-06-05 Pusher-type centrifuge
JP5501974A JPS5713344B2 (enrdf_load_stackoverflow) 1973-06-05 1974-05-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US36727473 US3831764A (en) 1973-06-05 1973-06-05 Pusher-type centrifuge

Publications (1)

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US3831764A true US3831764A (en) 1974-08-27

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US (1) US3831764A (enrdf_load_stackoverflow)
JP (1) JPS5713344B2 (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2580955A1 (fr) * 1985-04-26 1986-10-31 Charbonnages De France Panier d'essoreuse centrifuge pour matiere granuleuse humide
WO1993010907A1 (en) 1991-11-27 1993-06-10 Baker Hughes Incorporated Feed accelerator system including accelerator disc
EP0613401A4 (en) * 1991-11-27 1995-05-03 Baker Hughes Inc LOAD ACCELERATION SYSTEM INCLUDING AN ACCELERATION CONE.
EP0678333A1 (de) * 1994-04-22 1995-10-25 Krauss-Maffei Aktiengesellschaft Schubzentrifuge
US5520605A (en) * 1991-12-31 1996-05-28 Baker Hughes Incorporated Method for accelerating a liquid in a centrifuge
US5651756A (en) * 1991-11-27 1997-07-29 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US20020132718A1 (en) * 2000-08-31 2002-09-19 Koch Richard James Centrifuge for separating fluid components
US6561965B1 (en) * 2000-10-20 2003-05-13 Alfa Laval Inc. Mist pump for a decanter centrifuge feed chamber
US20030096691A1 (en) * 2000-08-31 2003-05-22 Koch Richard James Centrifuge systems and methods
US20030228966A1 (en) * 2000-08-31 2003-12-11 Koch Richard James Centrifuge systems and methods
EP1468742A1 (de) * 2003-04-16 2004-10-20 Ferrum AG Mehrstufige Schubzentrifuge
US20040206689A1 (en) * 2003-04-16 2004-10-21 Ferrum Ag Multi-stage pusher centrifuge
CN104001628A (zh) * 2013-12-20 2014-08-27 浙江轻机离心机制造有限公司 一种双级推料离心机分配加速盘装置
US20210316235A1 (en) * 2019-11-18 2021-10-14 Lg Chem, Ltd. Pressurizing centrifugal dehydrator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5381337A (en) * 1976-12-20 1978-07-18 Omura Sei Saplings and its growing method
JPS6168938U (enrdf_load_stackoverflow) * 1984-10-12 1986-05-12
JPS60187354A (ja) * 1984-12-28 1985-09-24 Kaname Wakasugi 除塩砂製造装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136721A (en) * 1961-03-31 1964-06-09 Pennsalt Chemicals Corp Centrifugal solids dryer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136721A (en) * 1961-03-31 1964-06-09 Pennsalt Chemicals Corp Centrifugal solids dryer

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2580955A1 (fr) * 1985-04-26 1986-10-31 Charbonnages De France Panier d'essoreuse centrifuge pour matiere granuleuse humide
US4682423A (en) * 1985-04-26 1987-07-28 Charbonnages De France Centrifugal drier drum for wet granular material
EP0199654A3 (en) * 1985-04-26 1988-09-21 Charbonnages De France, Etablissement Public Dit: Centrifugal drier basket for wet granular material
EP0613401A4 (en) * 1991-11-27 1995-05-03 Baker Hughes Inc LOAD ACCELERATION SYSTEM INCLUDING AN ACCELERATION CONE.
US5401423A (en) * 1991-11-27 1995-03-28 Baker Hughes Incorporated Feed accelerator system including accelerator disc
EP0613403A4 (en) * 1991-11-27 1995-05-03 Baker Hughes Inc SUPPLY ACCELERATOR SYSTEM INCLUDING AN ACCELERATOR DISC.
WO1993010907A1 (en) 1991-11-27 1993-06-10 Baker Hughes Incorporated Feed accelerator system including accelerator disc
US5527258A (en) * 1991-11-27 1996-06-18 Baker Hughes Incorporated Feed accelerator system including accelerating cone
US5651756A (en) * 1991-11-27 1997-07-29 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US5658232A (en) * 1991-11-27 1997-08-19 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US6077210A (en) * 1991-12-31 2000-06-20 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5520605A (en) * 1991-12-31 1996-05-28 Baker Hughes Incorporated Method for accelerating a liquid in a centrifuge
US5551943A (en) * 1991-12-31 1996-09-03 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5632714A (en) * 1991-12-31 1997-05-27 Baker Hughes Inc. Feed accelerator system including accelerating vane apparatus
US5840006A (en) * 1991-12-31 1998-11-24 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
EP0678333A1 (de) * 1994-04-22 1995-10-25 Krauss-Maffei Aktiengesellschaft Schubzentrifuge
US7018326B2 (en) 2000-08-31 2006-03-28 Varco I/P, Inc. Centrifuge with impellers and beach feed
US20030096691A1 (en) * 2000-08-31 2003-05-22 Koch Richard James Centrifuge systems and methods
US20030228966A1 (en) * 2000-08-31 2003-12-11 Koch Richard James Centrifuge systems and methods
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
US20020132718A1 (en) * 2000-08-31 2002-09-19 Koch Richard James Centrifuge for separating fluid components
US6561965B1 (en) * 2000-10-20 2003-05-13 Alfa Laval Inc. Mist pump for a decanter centrifuge feed chamber
EP1468742A1 (de) * 2003-04-16 2004-10-20 Ferrum AG Mehrstufige Schubzentrifuge
US7017756B2 (en) 2003-04-16 2006-03-28 Ferrum Ag Multi-stage pusher centrifuge
US20040206689A1 (en) * 2003-04-16 2004-10-21 Ferrum Ag Multi-stage pusher centrifuge
CN104001628A (zh) * 2013-12-20 2014-08-27 浙江轻机离心机制造有限公司 一种双级推料离心机分配加速盘装置
CN104001628B (zh) * 2013-12-20 2016-03-30 浙江轻机离心机制造有限公司 一种双级推料离心机分配加速盘装置
US20210316235A1 (en) * 2019-11-18 2021-10-14 Lg Chem, Ltd. Pressurizing centrifugal dehydrator
US11833458B2 (en) * 2019-11-18 2023-12-05 Lg Chem, Ltd. Pressurizing centrifugal dehydrator

Also Published As

Publication number Publication date
JPS5713344B2 (enrdf_load_stackoverflow) 1982-03-16
JPS5021369A (enrdf_load_stackoverflow) 1975-03-06

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ALFA-LAVAL AB, GUSTAVSLUNDSVAGEN-147, ALVIK, STOCK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PENNWALT CORPORATION, A PA CORP.;REEL/FRAME:005060/0780

Effective date: 19890130