US3779450A - Basket centrifuge - Google Patents

Basket centrifuge Download PDF

Info

Publication number
US3779450A
US3779450A US00239085A US3779450DA US3779450A US 3779450 A US3779450 A US 3779450A US 00239085 A US00239085 A US 00239085A US 3779450D A US3779450D A US 3779450DA US 3779450 A US3779450 A US 3779450A
Authority
US
United States
Prior art keywords
bowl
hub
separation chamber
feed cone
ribs
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
Application number
US00239085A
Other languages
English (en)
Inventor
L Shapiro
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
Original Assignee
Pennwalt Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pennwalt Corp filed Critical Pennwalt Corp
Application granted granted Critical
Publication of US3779450A publication Critical patent/US3779450A/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.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/06—Arrangement of distributors or collectors in centrifuges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor

Definitions

  • the improvement includes structure which supports the bowl and feed cone on the hub, while simultaneously closing the bottom of the feed cone and forming a plurality of enclosed passageways which extend from the bottom interior of the'cone into the separation chamber; the passageways are symmetrically arranged around the axis, and mounted so as to rotate with the bowl.
  • feed mixture is introduced into the top of the rotating' feed cone, the mixture descending to the bottom interior thereof; from the bottom interior of the feed cone, the mixture enters the enclosed passageways where it is tangentially accelerated while being fedinto the separation chamber.
  • a feed cone supported on and surrounding the hub is also used to introduce the mixture into the separation chamber.
  • the mixture is discharged radially outwardly from the bottom of the feed cone toward the separation chamber, and after entering the latter, is contacted by accelerator vanes located therein.
  • accelerator vanes located therein.
  • the mixture leavesthe feed cone, and is discharged radially outwardly over the open areas in the bottom of the centrifuge; because of the air circulation generated by the rotating bowl and supporting ribs, some of the mixture is consequently atomized and decends into a solids compartment located beneath the bowl, thus reducing the dryness of the separated and-discharged solids contained therein. Also, while passing from the feed cone into the separation chamber, the mixture is not being tangentially accelerated.
  • the present invention relates to a basket centrifuge which rotates about a vertical axis and has a hub, a feed cone supported on and surrounding the hub, and a bowl with aseparation chamber therein.
  • An annular plate is connected to the bottom periphery of the feed cone, the annular plate extending radially inwardly to the hub to which it is welded.
  • This annular plate has a plurality 'of openings formed therein which are symmetrically arranged around the axis of rotation, and disposed radially inwardly from the feed cone.
  • a plurality of pairs of radially extending ribs supports the bowl on the hub, each rib extending into the separation chamber and being welded to the bottom interior surface'of the bowl, to the underside of the annular plate, and to the hub, one rib of each pair being located on each side of each opening.
  • each pair of ribs is closed on top thereof by a cover plate welded thereto which extends from the bottom periphery of the cone into the separation chamber, the upper surface of each plate being inclined; the bottom of each pair of ribs is closed by a bottom platewelded thereto which extends from the hub into the separation chamber.
  • Disposed adjacent each opening within the bottom interior of the feed cone is-a generally radially extending accelerator plate.
  • a feed mixture is introduced into the top interior of the rotating feed cone.
  • the mixture then descends to the bottom interior of the feed cone where it contacts the accelerator plates immediately prior to entering'the enclosed passageways, thus increasing the tangential velocity of the mixture.
  • the mixture is further tangentially accelerated while it is simultaneously fed into the separation chamber.
  • enclosed passageways Consistent with maintaining an adequate open area in the bottom of the centrifuge, as many enclosed passageways as possible are desirable.
  • These passageways should be symmetrically disposed around the axis of rotation so as to distribute the mixture equally around the interior of the centrifuge bowl.
  • the upper surface of each of the enclosed passageways is inclined as stated above; this allows the heavy phase material (e.g. solids) separated from the mixture, to slide off these surfaces during that portion of the cycle when solids are being discharged through the bottom of the centrifuge.
  • FIG. 3 is a perspectiveview showing one of the enclosed passageways extending from the bottom interior of the feed cone into the separation chamber within the bowl.
  • FIG. 4 is a cross-sectional view taken through line 4-4 of FIG. 2.
  • FIG. 5 is a cross-sectional view taken through lines 5-5 of FIG. 2.
  • FIG. 6 is a cross-sectional view taken through lines 6-6 of FIG. 2.
  • a basket centrifuge 10 which includes a stationarily mounted housing 12.
  • centrifuge bowl I4 is fixedly connected (by means which will be hereinafter described) to a driving hub 15, the latter in turn being fixedly connected to a drive shaft 16 which is adapted to rotate about a vertical axis of rotation.
  • a driving hub 15 which is adapted to rotate about a vertical axis of rotation.
  • the lower end thereof has a pulley (not shown) connected thereto, the pulley being connected by a belt to a driving motor.
  • a feed mixture is introduced into bowl 14 through a feed tube 17, this tube being stationarily mounted.
  • Tube 17 is provided with a solenoid operated valve 18 for controlling the passage of the mixture into the centrifuge.
  • the mixture exits tube 17 and enters the top interior of the rotating cone 20.
  • the mixture then descends to the bottom interior of the cone where it is discharged radially outwardly through a plurality of enclosed passageways (to be hereinafter described) toward the peripheral surface 21 of the bowl.
  • the radially outwardly discharge of the mixture from the cone 20 is indicated generally by the arrow 23.
  • the mixture After the mixture enters the rotating bowl 14, it is separated into an outer annular layer of heavy phase material (e.g., solids), which accummulates against the surface 21, and into the concentric inner annular layer of light phase material e.g., liquid).
  • heavy phase material e.g., solids
  • light phase material e.g., liquid
  • an effluent (light phase material) conduit 22 which leads to an effluent tank (not shown), from which the collected effluent is later withdrawn.
  • a conventional skimmer 24 is provided.
  • This skimmer includes 'a skimmer tube 25 which presents an open mouth 26' facing against the direction of rotation of bowl 14.
  • the skimmer tube 25 is mounted on housing 12 in a plurality of bosses 28 in which the skimmer tube 25 is longitudinally movable. As the skimmer tube 25 is moved radially outwardly through the inner annular layer, i.e., deeper into bowl'14, the combination of the velocity of the liquid passing into the mouth 26 of the skimmer tube, and the centrifugal pressure head of the.
  • liquid in which the skimmer tube is submerged causes the liquid to be pumped" intoand through the skimmer tube.
  • the means formoving skimmer tube25 is indicated schematically at 30, and comprises a piston-cylinder assembly which alternately drives the skimmer tube radially outwardly and radially inwardly.
  • Drive means 30 is carefully arranged so that at its inward limit of travel, skimmer tube 25 is disposed with its mouth 26 located radially inwardly from liquid overflow lip 31, and consequently, out of the liquid.
  • skimmer. tube 25 is located so that its mouth 26 is approximately one-sixteenth to one-quarter inch from surface 21.
  • skimmer tube 25 As skimmer tube 25 is moved radially outwardly toward outer peripheral wall 32 of the bowl, it will eventually move into the outer annular layer of accummulated solids.
  • a lug or protuberance 29 is mounted on the skimmer tube 25 between bosses 28.
  • a limit switch 33 is actuated by protuberance 29 in either direction of travel of the skimmer tube 25.
  • Limit switch 33 is connected'to a solenoid operated diversional valve 35, the
  • the arrangement being such that when limit switch 33 is tripped in either direction the diversional valve will be shifted.
  • the diversional valve 35 is shifted to its solids position so as to discharge solids as the mouth 26 of the skimmer tube reaches the line of separation (e-line) between the inner annular layer and the outer annular layer.
  • the skimmer tube moves radially inwardly, the diversional valve is shifted back to the effluent" position.
  • the light phase material is directed to one discharge line, and the heavy phase material is directed to another. discharge line.
  • the effluent discharge line can be connected to the same effluent tank ,to which the conduit 22 is connected, and the solids discharge line will be connected to a separate collecting point.
  • the above mentioned layers of material will accummulate within separation chamber of bowl 14, the separation chamber being defined as that annular area within the bowl located radially outwardly from liquid overflow lip 31.
  • the inner annular layer of liquid will accumulate until reaching liquid overflow lip 31 at which time, it will flow over the lip and into the housing 12 from which it is discharged via effluent conduit 22.
  • a knife or plow assembly 36 mounted to housing 12 of the centrifuge, this assembly including a motor 38 utilized for rotating a shaft 40 upon which is mounted a knife blade or plow 42. It may be desirable in certain instances to utilize this assembly instead of skimmer 24 for removing accumulated solids from within the bowl 114. If it is desired to use plow assembly 36 to remove accumulated solids, skimmer 24 may first be used to remove the effluent, after which the plow 42 is moved outwardly to remove accumulated solids.
  • Solids thus removed are discharged, as indicated generally by the arrow 44, over an annular solids discharge lip 45 and through a plurality of openings formed in the bottom of the centrifuge including opening 46, and are collected in a bin or other receptacle located beneath the centrifuge. It is noted that the solids discharge lip 45 is located radially inwardly from the liquid overflow lip 31.
  • FIGS. 2 through 6 a means will be described for supporting'the bowl 14 and feed cone 20 on the hub 15, while simultaneously defining a plurality of enclosed passageways extending from the bottom interior of the feed cone into the separation chamber, these passageways being utilized to feed the mixture into the separation chamber while simultaneously tangentially accelerating the mixture.
  • the bottom'of the feed cone has a flange for fixedly connecting the feed cone by means of bolts 48 to the outer periphery of an annular plate 50, this annular plate extending radially inwardly to the hub 15; the inner periphery of the annular plate 50 is preferably welded to the hub 15.
  • Annular plate 50 has a plurality of openings 52 formed therein, these openings being symmetrically disposed around the axis of rotation so that the angular distances between adjacent openings are equal.
  • Each opening 52 forms the beginning of each of the enclosed passageways described herein.
  • a radially extending rib is welded to the underside of annular plate 50. As can be seen in FIGS. 2 and 3, these ribs extend radially outwardly into the separation chamber, the bottom edges of the ribs contacting the interior surface of the bottom of bowl 14 from the solids discharge lip 45 radially outwardly to the outer ends of said ribs. Ribs 54 are welded to this interior surface of the bottom of the bowl, and also to the hub 15, thus supporting the bowl on the hub. Thus, a pair of ribs 54 cooperates with each opening 52 to partially define an enclosed passageway extending from the bottom interior of feed cone 20 into the separation chamber.
  • a bottom plate 56 extends across the bottom (see FlG. 4 for example) of each pair of ribs, and is welded to the ribs. Each bottom plate extends radially outwardly from hub to the annular solids discharge lip 45 (see FlG. ll), and is preferably welded to both.
  • a cover plate 58 extends across the top of each pair of ribs'and is welded to the ribs, each cover plate extending radially outwardly from the outermost periphery of the feed cone-annular plate assembly into the separation chamber.
  • each cover plate extends at least to, but preferably outwardly beyond the radius of the liquid overflow lip 31.
  • the outer ends of. ribs 54 preferably extend slightly beyond the outer end 6th of each cover plate 58, as is clearly shown in FIG. 3.
  • a plurality of enclosed passageways 62 are defined, each passageway 62 extending from the bottom interior of the feed cone into the separation chamber (i.e., each enclosed passageway 62 extends outwardly at least to the radius of liquid overflow lip 31).
  • the incoming mixture exits the bottom interior of feed cone 20, entering enclosed passageways 62 as it is passing through openings 52.
  • the mixture is tangentially accelerated by contact with accelerator plates 64 (see H083 and 4).
  • a generally radially extending accelerator plate 64 is mounted adjacent each opening 52, the plate preferably being welded in place.
  • ribs 54 preferablyextend radially beyond the radius of the liquid overflow lip 31.
  • each cover plate 58 is inclined or upwardly tapered as indicated by the numeral 68. As best seen in FIGS. 1 and 2, adjacent pairs of passageways 62 are spaced apart to define between them the individual openings 66 through which the separated solids or other heavy phase material are discharged from the bowl in downward axial direction therethrough.
  • a basket centrifuge comprising a centrifuge bowl adapted'to rotate about a vertical axis and having a separation chamber therein, said bowl having an annular liquid overflow lip formed about said axis at the upper end of said bowl, an annular solids discharge lip formed about said axis at the lower end of said bowl, said solids discharge lip being located radially inwardly, from said bowl a greater distance than said liquid overflow lip, a hub, first means comprising a feed cone formed about said axis and surrounding said hub for feeding a mixture of at least two materials into said separation chamber wherein the first material thereof has'a higher specific gravity than the second material thereof, whereby said first material builds up against the peripheral wall of said bowl during rotation thereof to form an-outer annular layer, while said second material forms a concentric inner annular layer, and second means for fixedly supporting said bowl on said hub while simultaneously forming both a bottom on said feed cone and.
  • a basket centrifuge according to claim 3 including a generally radially extending accelerator plate disposed adjacent each of said openings within the interior of said feed cone.
  • a basket centrifuge according to claim 4 wherein the inner periphery of said annular plate is welded to said hub.
  • a basket centrifuge according to claim 2 and further including means for accelerating the tangential velocity of said mixture prior to entering said openings.

Landscapes

  • Centrifugal Separators (AREA)
US00239085A 1972-03-29 1972-03-29 Basket centrifuge Expired - Lifetime US3779450A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23908572A 1972-03-29 1972-03-29

Publications (1)

Publication Number Publication Date
US3779450A true US3779450A (en) 1973-12-18

Family

ID=22900538

Family Applications (1)

Application Number Title Priority Date Filing Date
US00239085A Expired - Lifetime US3779450A (en) 1972-03-29 1972-03-29 Basket centrifuge

Country Status (2)

Country Link
US (1) US3779450A (enrdf_load_stackoverflow)
JP (1) JPS5638265B2 (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937397A (en) * 1974-08-28 1976-02-10 The De Laval Separator Company Basket centrifuge
US3963175A (en) * 1974-07-31 1976-06-15 Ametek, Inc. Feedcone with accelerator vanes for imperforate basket
US4543085A (en) * 1982-02-05 1985-09-24 Hitachi, Ltd. Apparatus for separating solid matters
US4652254A (en) * 1985-02-01 1987-03-24 Matsumoto Machine Mfg., Co., Ltd. Centrifugal separator
DE3904358A1 (de) * 1989-02-14 1990-08-02 Krupp Industrietech Schael- und austragsvorrichtung
US5356367A (en) * 1991-12-04 1994-10-18 Carr Engineering Associates, Inc. Centrifugal separator with flexibly suspended restrainable bowl
US5401423A (en) * 1991-11-27 1995-03-28 Baker Hughes Incorporated Feed accelerator system including accelerator disc
US5520605A (en) * 1991-12-31 1996-05-28 Baker Hughes Incorporated Method for accelerating a liquid in a centrifuge
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
US6425849B1 (en) * 2001-03-27 2002-07-30 Ronald D. Benson Solid bowl centrifuge with liquid release during rotation
US20070199907A1 (en) * 2003-09-30 2007-08-30 Mitchelson Keith R Apparatus And Method For Centrifugal Separation
DE102008009253A1 (de) * 2008-02-15 2009-08-27 Heinkel Holding Gmbh Schälvorrichtung zum Abschälen eines Feststoffkuchenmaterials von der Innenseite einer Trommel einer Zentrifuge
CN105583088A (zh) * 2016-03-11 2016-05-18 江苏华大离心机制造有限公司 一种用于立式离心机中的进料装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54139373U (enrdf_load_stackoverflow) * 1978-03-14 1979-09-27
US4612210A (en) * 1985-07-25 1986-09-16 International Business Machines Corporation Process for planarizing a substrate

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1176412A (en) * 1913-05-02 1916-03-21 David B Weston Centrifugal separator.
US2448038A (en) * 1942-08-01 1948-08-31 Henry G Lykken Disintegrator and vortical classifier for solids
US3092584A (en) * 1959-12-08 1963-06-04 Separator Ab Centrifugal separation of liquids containing flocculating sludge
US3407999A (en) * 1966-11-10 1968-10-29 Pennsalt Chemicals Corp Sludge discharge means for a centrifuge

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1176412A (en) * 1913-05-02 1916-03-21 David B Weston Centrifugal separator.
US2448038A (en) * 1942-08-01 1948-08-31 Henry G Lykken Disintegrator and vortical classifier for solids
US3092584A (en) * 1959-12-08 1963-06-04 Separator Ab Centrifugal separation of liquids containing flocculating sludge
US3407999A (en) * 1966-11-10 1968-10-29 Pennsalt Chemicals Corp Sludge discharge means for a centrifuge

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963175A (en) * 1974-07-31 1976-06-15 Ametek, Inc. Feedcone with accelerator vanes for imperforate basket
US3937397A (en) * 1974-08-28 1976-02-10 The De Laval Separator Company Basket centrifuge
US4543085A (en) * 1982-02-05 1985-09-24 Hitachi, Ltd. Apparatus for separating solid matters
EP0085953A3 (en) * 1982-02-05 1986-02-19 Hitachi, Ltd. Apparatus for separating solid matters
US4652254A (en) * 1985-02-01 1987-03-24 Matsumoto Machine Mfg., Co., Ltd. Centrifugal separator
US5066271A (en) * 1989-02-14 1991-11-19 Krupp Industrietechnik Gmbh Blade-support system for centrifuge
DE3904358A1 (de) * 1989-02-14 1990-08-02 Krupp Industrietech Schael- und austragsvorrichtung
US5651756A (en) * 1991-11-27 1997-07-29 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US5401423A (en) * 1991-11-27 1995-03-28 Baker Hughes Incorporated Feed accelerator system including accelerator disc
US5658232A (en) * 1991-11-27 1997-08-19 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US5527258A (en) * 1991-11-27 1996-06-18 Baker Hughes Incorporated Feed accelerator system including accelerating cone
US5356367A (en) * 1991-12-04 1994-10-18 Carr Engineering Associates, Inc. Centrifugal separator with flexibly suspended restrainable bowl
US5425698A (en) * 1991-12-04 1995-06-20 Carr Engineering Associates, Inc. Centrifugal separator with flexibly suspended restrainable bowl
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
US5520605A (en) * 1991-12-31 1996-05-28 Baker Hughes Incorporated Method for accelerating a liquid in a centrifuge
US5840006A (en) * 1991-12-31 1998-11-24 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US6077210A (en) * 1991-12-31 2000-06-20 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US6425849B1 (en) * 2001-03-27 2002-07-30 Ronald D. Benson Solid bowl centrifuge with liquid release during rotation
US6740027B1 (en) * 2001-03-27 2004-05-25 Ronald D. Benson Solid bowl centrifuge with liquid release during rotation
US20070199907A1 (en) * 2003-09-30 2007-08-30 Mitchelson Keith R Apparatus And Method For Centrifugal Separation
US8033976B2 (en) * 2003-09-30 2011-10-11 Capitalbio Corporation Apparatus and method for centrifugal separation utilizing a movable collection assembly
DE102008009253A1 (de) * 2008-02-15 2009-08-27 Heinkel Holding Gmbh Schälvorrichtung zum Abschälen eines Feststoffkuchenmaterials von der Innenseite einer Trommel einer Zentrifuge
CN105583088A (zh) * 2016-03-11 2016-05-18 江苏华大离心机制造有限公司 一种用于立式离心机中的进料装置
CN105583088B (zh) * 2016-03-11 2018-03-02 江苏华大离心机制造有限公司 一种用于立式离心机中的进料装置

Also Published As

Publication number Publication date
JPS5638265B2 (enrdf_load_stackoverflow) 1981-09-05
JPS4915067A (enrdf_load_stackoverflow) 1974-02-09

Similar Documents

Publication Publication Date Title
US3779450A (en) Basket centrifuge
KR950007586B1 (ko) 교반장치
US2711854A (en) Centrifuge for separating sludge from liquids
US3234716A (en) Apparatus for separating dust and other particles from suspension in a gas
US1664769A (en) Method and apparatus for centrifugal thickening of mixtures and clarifying of liquids
JPS62102846A (ja) 遠心分離機
JPS6045921B2 (ja) 連続的に作業する全壁型向流式遠心抽出器
US3799431A (en) Centrifuge apparatus
US2254455A (en) Continuously operating centrifuge
US1749368A (en) Continuous separation of liquids and solids
US3302794A (en) Continuous centrifugal with adjustable liquids separator
US2353983A (en) Purification of pulp
US2752090A (en) Centrifugal separators
US3734398A (en) Basket centrifuge with material removing means
US3937397A (en) Basket centrifuge
US4350282A (en) Self-purging centrifuge
US2067590A (en) Centrifugal separator
US3108067A (en) Centrifugal apparatus
US3276591A (en) Apparatus for treating suspensions
US3552575A (en) Centrifuge
US1991490A (en) Centrifugal separation
US1988612A (en) Method and apparatus for separating solids from liquids
US4460352A (en) Centrifuge drum for clarifying and/or separating liquids
US2788937A (en) Centrifuge for separating solid components from liquids
GB1039031A (en) Separation process and apparatus

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