US3322336A - Clarifying centrifuge - Google Patents

Clarifying centrifuge Download PDF

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Publication number
US3322336A
US3322336A US464315A US46431565A US3322336A US 3322336 A US3322336 A US 3322336A US 464315 A US464315 A US 464315A US 46431565 A US46431565 A US 46431565A US 3322336 A US3322336 A US 3322336A
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US
United States
Prior art keywords
drum
solid
liquid
suspension
centrifuge
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
US464315A
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English (en)
Inventor
Lohse Wilhelm
Ettishofen Post
Gene Peter
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.)
Sulzer Escher Wyss AG
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Escher Wyss AG
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Publication date
Application filed by Escher Wyss AG filed Critical Escher Wyss AG
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Publication of US3322336A publication Critical patent/US3322336A/en
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    • 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
    • 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
    • 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
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/04—Periodical feeding or discharging; Control arrangements therefor

Definitions

  • This invention relates to a clarifying centrifuge for separating a suspension into liquid and solid, having a solid-surface drum forming the external boundary of a separating chamber, on the inner surface of which drum the solid is deposited, while the clarified liquid is discharged internally.
  • the known continuously operating clarifying centrifuges are generally constructed, in the case of the cylindrical form of the solid-surface drum, as scraper-type overflow centrifuges, and in the case of the conical form of the solid-surface drum as worm type centrifuges.
  • continuous operation has to be interrupted for a short time, when the drum is filled almost to the overflow edge of the drum with solid, to scrape the latter out.
  • worm type centrifuge a conical conveyor worm rotates in the conical solid-surface drum at a different speed therefrom for conveying the solid, deposited on the inner surface of the drum, to the tapered discharge end of the drum, while the supernatant liquid is discharged at the wide drum end.
  • a clarifying centrifuge of the hereinbefore described kind for this purpose the solid-surface drum is for-med conically widened and the separating chamber is subdivided in the axial direction into two or more separating chambers, through which the suspension flows successively, subdivision into the chambers being effected by partitions extending at least to the vicinity of the wall of the solid-surface drum, said partitions having a bottom discharge situated on their outer edge for the deposited solid, and an overflow, situated closer to the axis of the centrifuge than the bottom discharge, for the suspension or clarified liquid.
  • FIG. 1 shows an axial section through a clarifying centrifuge
  • FIG. 1a is a top plan view of the internal parts of a clarifying centrifuge similar to that shown in FIG. 1, but employing separate bearing rings connected with each partition,
  • FIGS. 2 and 3 embodiments
  • FIG. 4 shows a portion of an axial section through a particular embodiment of a partition
  • FIG. 5 shows an axial section through a further embodiment.
  • the clarifying centrifuge shown in FIG. 1 has a rotor comprising a flaring solid-surface drum 1, which is show axial sections through further mounted by means of a shaft 2, secured to its narrow end, in a housing 3, and forms the outer boundary of a separating chamber 4.
  • a stationary feed pipe 5 is arranged concentric with regard to the solid-surface drum 1 and extends from the side opposite the shaft 2 into the solidsurface drum 1 as far as into the vicinity of its narrow end.
  • the separating chamber 4 of the flaring solid-surface drum 1 is subdivided in the axial direction of the centrifuge by partitions 6 6 6 into three separating chambers 4 4 4
  • the partitions 6 6 6 leave between their outer boundary and the inner surface of the flaring drum 1 an annular gap 7 or 7 7 serving as a bottom discharge for the deposited solid matter and have an overflow 8 or 8 8 situated closer to the axis of the centrifuge than said bottom discharge.
  • a tubular support 9 connects the partitions 6 6 '6 together and by means of cross-pieces a to a bearing ring 10.
  • a discharge funnel 11 for the liquid overflowing at 8 is secured to the partition 6 By movement of the bearing ring It) by means of a block 13 engaging its annular groove 12 in the axial direction of the centrifuge, the flow cross section of the annular gap bottom discharge 7 7 7 can be adjusted.
  • the shaft 2 is adapted to be driven by means not shown, so that the solid-surface drum 1 with the bearing ring it) and the partitions 6 6 6 rotate about the axis of the centrifuge.
  • the suspension to be separated into liquid and solid passes through the feed pipe 5 into the first separating chamber 4 and forms a ring, rotating with the solidsurface drum 1, in which the heavier solid particles travel outwardly, impinge on the inner surface of the flaring drum 1 and slide on the latter toward the bottom discharge 7
  • the lighter liquid and the solid particles suspended in it and not yet deposited flow over the overflow 8 into the second separating chamber 4 in which further solid particles are projected toward the inner surface of the drum 1.
  • the material passing through the overflow 8 into the third separating chamber 43 still contains solid matter in small quantity and in the form of very fine particles, which again are separated against the inner surface of the drum 1.
  • the liquid, clarified in three stages in the drum 1, leaves practically clear, that is to say, without disturbing traces of solid, via the discharge funnel II and is collected in the discharge housing 14.
  • the solid particles separated in the separating chamber 4 slide along the inner surface of the drum 1 through the bottom discharges 7 7 7 to the wide end of the flaring drum 1 and are discharged into a solid-matter collecting housing 15.
  • the flow of solid over the inner surface of the flaring drum 1 is regulated by adjustment of the passage cross section of the bottom discharges 7 '7 7 so as to maintain a continuous stream of solid matter and so that the latter always fills the passage cross section of the bottom discharges, thus preventing the passage of free liquid through the bottom discharges.
  • the bottom discharges '7 7 7 are advantageously first closed entirely until a sufficiently large amount of solid matter has collected in front of them.
  • each partition may be provided with its own bearing ring.
  • the partitions 6 and 6 may be slidable axially on the support and each of these partitions may be connected by a ring of cross pieces 9 and 9 extending along generatrices of the support 9 with each of two further bearing rings 10 and 10 mounted on the shaft. See the bearing rings 10 10 and 10 illustrated in FIG. 1a.
  • the cross pieces 9 of the partition 6 pass to the bearing ring 10 through recesses in the partition 6 and recesses in the bearing ring and the cross pieces 9 of partition 6 pass to the bearing ring 10 of partition 6 through recesses in the bearing ring 10 Like the cross pieces of the support 9, the cross pieces 9 and 9 of the partitions 6 and 6 would also pass through recesses in the hub disc of the solid-surface drum 1.
  • Adjustment of the partitions may be effected in accordance with the weight of the amount of solid matter situated in the separating chambers, the bearing rings being drawn by a spring into the position corresponding to the closure position of the partitions. If the amount of solid matter then increases the pressure on the partition also increases and the spring is tensioned, whereby the passage cross section of the bottom discharge is increased.
  • adjustment of the bearing ring 10 may also be effected in accordance with the quantity of solid matter discharged at the end of the solid-surface drum 1.
  • a vibration may be superimposed on the adjusting movement of the bearing ring 10 for preventing bridge formation of solid particles at the bottom discharge.
  • the flaring solid-surface drum 201 having two separating chambers 204 and 204 a solid-surface drum 216, which is conical in the opposite sense of the drum 201.
  • a conveyor worm 217 making a relative movement with regard to the drum 216.
  • Said worm is connected externally to a solid-surface drum 218, arranged concentrically to the solid-surface drum 216 and mounted by means of a hollow shaft 219 in the centrifuge housing.
  • the shaft 202 of the drum 201 and the hollow shaft 219 are adapted to be driven by means not shown.
  • the feed pipe 205 Passing through the hollow shaft 219 is the feed pipe 205, fast with the centrifuge housing, for the suspension to be separated, as well as a discharge pipe 220 for the clarified liquid, which discharge pipe surrounds the feed pipe with spacing, and which is also fast with the centrifuge housing, and has a hollow disc-shaped liquid takeoff device 221 at its end extending into the drum 201.
  • the wall of the drum 218 may also serve as partition between solid and clarified liquid.
  • the shaft 202 carries a distributor head 223, rotating with, it for the uniform introduction of the suspension into the first separating chamber 204
  • the throughput direction of the liquid in the separating chamher 304 is opposite to the throughput of the solid.
  • the solid flows along the flaring solid-surface drum 301 and is pushed out by a conveyor worm 317 along the conical solidsurface drum 316.
  • the suspension to be separated into liquid and solid is fed to the drum 301 through the feed pipe 305 at its wider end.
  • the space limited outwardly by the abutting ends of the solid-surface drums 301 and 316 forms the first separating chamber, from which the liquid phase passes through the overflow 308 of partition 306 into the second separating chamber 304 and then through the overflow 308 of the partition 306 into the separating chamber 304 now counted as third separating chamber.
  • the separating chamber 304 has an overflow 308, which is situated in the hub disc of the drum 301 4 and through which the clarified liquid is discharged into a discharge housing 324.
  • the shaft of the drum 301 is formed as a hollow shaft 325, and the drum 316 also has a hollow shaft 326, the centrifuge drum consisting of the drums 301 and 316 being journalled in the centrifuge housing by means of the hollow shafts 325 and 326.
  • Journalled in the two hollow shafts 325 and 326 is a shaft 327 carrying the conveyor worm 317, said shaft 327 having a central bore 328 for the feed pipe 305 and orifices 329 for the exit of the fed suspension into the first separating chamber.
  • the hollow shaft 325 and the shaft 327 are adapted to be driven at different speeds by means, not shown.
  • the partition 406 shown in FIG. 4 has an additional Wall formed by an annular projection 430 for deflecting the overflowing liquid phase toward the drum 401.
  • This additional wall is located opposite the overflow 408 and deflects outwardly the stream of liquid issuing from the opening of the overflow 408, whereupon the stream flows inwardly again around the outer edge of the additional wall 430.
  • Such an additional wall may also be provided in front in the throughput direction of the liquid.
  • the gap between the inner surface of the drum 401 and the additional wall 430 must be larger than the thickness of the layer of solid matter situated on the drum 401 in the region of the gap.
  • a scraper centrifuge is connected in front of the flaring drum 501.
  • This scraper centrifuge has a substantially cylindrical solid-surface drum or annular shell 531, which forms a pre-separation chamber and is journalled in the centrifuge housing by means of a hub disc 532 and a shaft 533.
  • This cylindrical solid-surface drum 531 carries on its end opposite the hub disc 532 the flaring solid-surface drum 501.
  • the partitions 506 and 506 of the drum 501 are connected together by cross pieces 534, and to the bearing ring 510 via the discharge hopper 511 by means of a disc 535, cross pieces 536 and a disc 537. These parts 535, 536, 537 are located outside the two drums 501 and 531.
  • the suspension fed through the supply pipe 505 passes through a vertical duct 538 into the drum 531, the bulk of the solid matter being deposited on the inner surface of this drum.
  • the liquid, still containing particles of solid matter leaves the drum 531 via an overflow 539 directed toward chamber 504 at the narrower end of the flaring drum 501 and is completely clarified in the tWo successive separating chambers 504 and 504 of drum 501.
  • the solid matter collecting in the solid-surface drum 531 is periodically dischargetd in known manner by means of a scraping device 540, while the solid matter sliding on the inner surface of the solid-surface drum 501, regulated by the bottom discharges 507 and 507 and continuously being discharged, enters the solid-matter collecting housing 515.
  • the angle of flare of the wall of the drum is adapted to the angle of repose of the solid matter deposited in each case, and in the constructional examples, it increases from the first separating chamber to the second separating chamber in the discharge direction of the solid matter.
  • a centrifuge rotor for separating a suspension into liquid and solid comprising a shaft; a flaring solid surface drum mounted on said shaft coaxially therewith; at least two annular partitions arranged within said drum coaxially therewith; said partitions forming consecutive separating chambers for the suspension within said drum; each of said partitions leaving between its outer boundary and the drum a gap for the discharge of deposited solid along the inner drum surface toward the wider end of the drum and having an overflow for the liquid at a point situated closer to the drum axis than said discharge gap; means for supplying the suspension to the separating chamber situated nearest to the other end of said drum; and means for dischargclarified liquid from the separating chamber situated nearest to the ot her end of said drum; and means for discharging the deposited solid from the wider end of the flaring drum.
  • the means for supplying the suspension comprise an annular shell connected to the narrower end of the flaring drum, formed as a pre-separation chamber for receiving the suspension and having an overflow toward the narrower end of the flaring drum; scraper means being provided for the discharge of the solid matter deposited in said pre-separation chamber.

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  • Centrifugal Separators (AREA)
US464315A 1964-06-24 1965-06-16 Clarifying centrifuge Expired - Lifetime US3322336A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH825864A CH418982A (de) 1964-06-24 1964-06-24 Klärzentrifuge zum Scheiden einer Suspension in Flüssigkeit und Feststoff

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US3322336A true US3322336A (en) 1967-05-30

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US (1) US3322336A (de)
CH (1) CH418982A (de)
DE (1) DE1482714C3 (de)
GB (1) GB1112303A (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368684A (en) * 1966-08-23 1968-02-13 Escher Wyss Ltd Continuously operating centrifuging device
US3527401A (en) * 1968-07-11 1970-09-08 Krueger As I Drum centrifuge with rotating worm conveyor
US3782623A (en) * 1970-06-11 1974-01-01 Krueger As I Decanting centrifuge for draining off water from sewage sludge
FR2409794A1 (fr) * 1977-11-25 1979-06-22 Escher Wyss Sa Centrifugeuse a poussee
US4299352A (en) * 1979-03-23 1981-11-10 Kobe, Inc. Centrifuge apparatus
US4347971A (en) * 1977-03-03 1982-09-07 Joy Manufacturing Company Centrifuge apparatus
US4961723A (en) * 1986-08-16 1990-10-09 Westfalia Separator Ag Centrifuge drum for clarifying or separating centrifugates
AU640258B2 (en) * 1991-08-16 1993-08-19 Kotobuki Techrex Ltd. Sedimentation centrifuge
US5306225A (en) * 1990-11-27 1994-04-26 Tsukishima Kikai Co., Ltd. Decanter centrifuge having a disc-like dip weir with a hole
US5310399A (en) * 1991-08-20 1994-05-10 Kotobuki Techrex Ltd. Sedimentation centrifuge containing screw conveyor with fins
US5314399A (en) * 1991-08-20 1994-05-24 Kotobuki Techrex Ltd. Sedimentation centrifuge with helical fins mounted on the screw conveyor
WO1999065610A1 (en) * 1998-06-15 1999-12-23 Alfa Laval Ab A decanter centrifuge
US6589154B2 (en) 2001-05-30 2003-07-08 Alfa Laval Inc. Decanter centrifuge with a gear box mounted on the bowl
CN110760623A (zh) * 2019-11-26 2020-02-07 广西叶茂食品有限责任公司 蔗汁加热抑菌及去除浮杂系统及工艺
US20210316235A1 (en) * 2019-11-18 2021-10-14 Lg Chem, Ltd. Pressurizing centrifugal dehydrator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128904B (en) * 1982-10-09 1986-01-29 Edward L Simonds Centrifugal separator
CN109013071A (zh) * 2018-09-13 2018-12-18 安徽普源分离机械制造有限公司 一种高效分离的液-液-固三相高速卧螺离心机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1640707A (en) * 1923-09-29 1927-08-30 Laughlin Filter Corp Machine for separating solids from liquids or liquids from liquids

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1640707A (en) * 1923-09-29 1927-08-30 Laughlin Filter Corp Machine for separating solids from liquids or liquids from liquids

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368684A (en) * 1966-08-23 1968-02-13 Escher Wyss Ltd Continuously operating centrifuging device
US3527401A (en) * 1968-07-11 1970-09-08 Krueger As I Drum centrifuge with rotating worm conveyor
US3782623A (en) * 1970-06-11 1974-01-01 Krueger As I Decanting centrifuge for draining off water from sewage sludge
US4347971A (en) * 1977-03-03 1982-09-07 Joy Manufacturing Company Centrifuge apparatus
FR2409794A1 (fr) * 1977-11-25 1979-06-22 Escher Wyss Sa Centrifugeuse a poussee
US4217226A (en) * 1977-11-25 1980-08-12 Escher Wyss Limited Pusher centrifuge
US4299352A (en) * 1979-03-23 1981-11-10 Kobe, Inc. Centrifuge apparatus
US4961723A (en) * 1986-08-16 1990-10-09 Westfalia Separator Ag Centrifuge drum for clarifying or separating centrifugates
US5306225A (en) * 1990-11-27 1994-04-26 Tsukishima Kikai Co., Ltd. Decanter centrifuge having a disc-like dip weir with a hole
AU640258B2 (en) * 1991-08-16 1993-08-19 Kotobuki Techrex Ltd. Sedimentation centrifuge
US5310399A (en) * 1991-08-20 1994-05-10 Kotobuki Techrex Ltd. Sedimentation centrifuge containing screw conveyor with fins
US5314399A (en) * 1991-08-20 1994-05-24 Kotobuki Techrex Ltd. Sedimentation centrifuge with helical fins mounted on the screw conveyor
WO1999065610A1 (en) * 1998-06-15 1999-12-23 Alfa Laval Ab A decanter centrifuge
US6712751B2 (en) * 1998-06-15 2004-03-30 Alfa Laval Ab Centrifugal separator for separating solids from a liquid mixture centrally fed through a gear device
US6716153B2 (en) * 1998-06-15 2004-04-06 Alfa Laval Ab Centrifugal separator for separating solids from a liquid mixture centrally fed through a gear device
CN1298432C (zh) * 1998-06-15 2007-02-07 阿尔法拉瓦尔有限公司 一种沉降式离心机
EP2322283A3 (de) * 1998-06-15 2011-08-24 Alfa Laval Ab Dekanterzentrifuge
US6589154B2 (en) 2001-05-30 2003-07-08 Alfa Laval Inc. Decanter centrifuge with a gear box mounted on the bowl
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
CN110760623A (zh) * 2019-11-26 2020-02-07 广西叶茂食品有限责任公司 蔗汁加热抑菌及去除浮杂系统及工艺

Also Published As

Publication number Publication date
GB1112303A (en) 1968-05-01
CH418982A (de) 1966-08-15
DE1482714B2 (de) 1974-04-04
DE1482714A1 (de) 1969-06-12
DE1482714C3 (de) 1974-10-31

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