US3777972A - Sludge centrifuge - Google Patents

Sludge centrifuge Download PDF

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Publication number
US3777972A
US3777972A US00235633A US3777972DA US3777972A US 3777972 A US3777972 A US 3777972A US 00235633 A US00235633 A US 00235633A US 3777972D A US3777972D A US 3777972DA US 3777972 A US3777972 A US 3777972A
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US
United States
Prior art keywords
rotor
sludge
chamber
periphery
nozzle means
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
US00235633A
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English (en)
Inventor
O Kjellgren
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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Alfa Laval AB
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 Alfa Laval AB filed Critical Alfa Laval AB
Application granted granted Critical
Publication of US3777972A publication Critical patent/US3777972A/en
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    • 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
    • B04B1/10—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl
    • B04B1/14—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge
    • B04B1/16—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge with discharging outlets controlled by the rotational speed of the bowl
    • B04B1/18—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge with discharging outlets controlled by the rotational speed of the bowl controlled by the centrifugal force of an auxiliary liquid

Definitions

  • the rotor periphery has at least one sludge outlet which is alternately [56] References C'ted opened and closed by an axially movable piston valve.
  • the present invention relates to centrifuges for separating a sludge-containing liquid and in which the rotor is provided along its periphery with circumferentially spaced nozzles which are permanently open to discharge sludge separated in the separating chamber of the rotor.
  • a difficulty with centrifuges of this type is that the nozzles are easily clogged if the sludge contains particles larger than the inner diameter of the nozzles.
  • the sludge concentration obtained in the separation depends upon the number as well as the inner diameter of the nozzles, since a reduced number of nozzles requires an increased inner diameter of the nozzles. If, in order to avoid this clogging of the nozzles, their inner diameter is increased and consequently their number is reduced correspondingly, the sludge cushions formed between the nozzles will grow faster radially inward toward the periphery of the disc set and into the latter, due to the bosh angle of the sludge. This means that the centrifuge must be stopped more often for cleaning than when using the smaller nozzles. Each cleaning of the centrifuge rotor requires dismounting of the rotor and consequently troublesome and time-consuming work. Different methods have been attempted for clean-flushing the centrifuge rotor while keeping it in rotation, without reaching any satisfactory solution of the problem
  • the separating chamber of the centrifuge rotor has the afore-mentioned nozzles, and the rotor is provided along its periphery with one or more sludge outlet openings arranged to be opened and closed by an axially movable piston valve.
  • this opening can extend continuously along the entire periphery of the rotor.
  • the opening and closing movements of the piston valve can be effected in a manner which is conventional in the art.
  • a centrifuge rotor 1* comprises an upper part la and a lower part l'b which are clamped together by a lock ring 2.
  • a sludge outlet opening 3 In the rotor wall is a sludge outlet opening 3 and similar openings (not shown) spaced around the periphery of the rotor, these openings being opened and closed in a conventional manner by a valve piston 4.
  • the latter has a'plurality of holes passing radially through the piston at its upper annular portion and spaced therearound to form permanently open sludge outlet nozzles, one of these holes being shown at 5.
  • such holes may be formed in the upper part 1a of the rotor body, as shown with dash-dotted lines at 5a.
  • the holes 5'or 5a open into the openings 3.
  • the holes 5 can have a diameter of 0.4mm; and when separating ,bakers cottage cheese from sour coagulated skim milk, these holes can have a diameter of 1.0 mm.
  • the rotor l is carried and driven by a hollow shaft 6, through the central channel of which liquid to be separated is supplied to the separating chamber of the rotor.
  • the liquid enters this chamber past the lower edge of a distributor 7.
  • Separated sludge is thrown outwardly through the holes 5; but between these holes (reckoned peripherally) sludge deposits are eventually formed as indicated at 8.
  • Purified liquid flows through a disc set 9 inwardly toward the axis of the rotor and thence, via an overflow outlet10, into a paring chamber 11.
  • the latter is provided with a stationary parting disc 12 connected to an outlet pipe. 13.
  • the skim milk is fed through the shaft 6 to the separating chamber of the rotor and is divided into whey and bakers cottage cheese.
  • the whey passes inwardly and is discharged by the paring disc 12, while the cheese passes outwardly toward the periphery of the rotor for discharge through the holes 5 and the openings 3.
  • some of the cheese deposits on the inner surface of the rotor periphery at its regions located between the circumferentially spaced holes 5, so that these deposits eventually form substantially conical cushions each having its apex extending inwardly toward the periphery of the disc set 9.
  • a layer of impurities settles along the inside of the rotor periphery, and through this layer extend radial channels which are formed just opposite the holes 5 and which remain open during the separation course. Bacteria separated from the milk are thrown out through these channels, as long as the sludge layer does not build up sufficiently to reach the periphery of the disc set. To avoid this build-up, the sludge layer may be discharged in the afore-mentioned manner at suitable intervals (for example, 1 hour).
  • the centrifuge rotor can be cleaned by opening the valve piston 4 while keeping the rotor in continued rotation.
  • valve piston 4 is actuated conventionally by varying the feed rate of an operating liquid from a stationary duct 15 into an annular space 4a between the valve piston 4 and the lower bowl part lb, this liquid entering the space 4a near the rotor axis.
  • the space 4a is maintained completely filled with the operating liquid despite a continual bleeding thereof through a peripheral outlet 4b.
  • the pressure of the operating liquid is sufficient to hold the upper edge of the piston against the opposing edge of the upper bowl part la, as shown at 16, thereby preventing discharge directly through the openings 3.

Landscapes

  • Centrifugal Separators (AREA)
US00235633A 1971-03-25 1972-03-17 Sludge centrifuge Expired - Lifetime US3777972A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE03877/71A SE350911B (es) 1971-03-25 1971-03-25

Publications (1)

Publication Number Publication Date
US3777972A true US3777972A (en) 1973-12-11

Family

ID=20263053

Family Applications (1)

Application Number Title Priority Date Filing Date
US00235633A Expired - Lifetime US3777972A (en) 1971-03-25 1972-03-17 Sludge centrifuge

Country Status (10)

Country Link
US (1) US3777972A (es)
JP (1) JPS5742523Y2 (es)
AT (1) AT317600B (es)
AU (1) AU469102B2 (es)
CH (1) CH532962A (es)
DE (2) DE2214487B2 (es)
DK (1) DK132994B (es)
FR (1) FR2130206B1 (es)
SE (1) SE350911B (es)
SU (1) SU566509A3 (es)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191325A (en) * 1977-08-12 1980-03-04 Alfa-Laval Ab Centrifuge with sludge outlets at rotor periphery
WO1982002153A1 (en) * 1980-12-23 1982-07-08 Co Inc Donaldson Self-purging centrifuge
US4347971A (en) * 1977-03-03 1982-09-07 Joy Manufacturing Company Centrifuge apparatus
US4410318A (en) * 1980-09-26 1983-10-18 Alfa Laval Ab Method and arrangement to watch over separated sediment, which is thrown out through nozzles of a centrifugal separator
US4432748A (en) * 1976-09-03 1984-02-21 Joy Manufacturing Company Centrifuge apparatus and method of operating a centrifuge
EP0205473B1 (en) * 1984-12-12 1989-03-15 Alfa-Laval Ab Outlet arrangement in a centrifugal separator
US4813923A (en) * 1987-02-09 1989-03-21 Alfa-Laval Separation Ab Centrifugal separator
US20030146146A1 (en) * 2000-06-08 2003-08-07 Wilfried Mackel Centrifuge with a sieve system and method for operating the same
WO2008140378A1 (en) * 2007-05-10 2008-11-20 Alfa Laval Corporate Ab Method and device for cleaning of a fluid in a centrifugal separator
US10357787B2 (en) 2009-03-06 2019-07-23 Alfa Laval Corporate Ab Centrifugal separator having energy consumption reducing devices

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4218897A1 (de) * 1992-06-09 1993-12-16 Vitrosep S L Verfahren zur Entfernung von Glaspartikeln aus beim Schleifen oder Polieren von Glas, insbesondere Flachglas, verwendetem Kühlwasser
DE10027959A1 (de) * 2000-06-08 2001-12-20 Westfalia Separator Food Tec G Zentrifuge mit Sieb und Verfahren zum Betreiben der Zentrifuge
DE102022108491A1 (de) * 2022-04-07 2023-10-12 Gea Westfalia Separator Group Gmbh Separator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682992A (en) * 1951-11-02 1954-07-06 Int Harvester Co Power washing cream separator and threaded drive member therefor
US3460750A (en) * 1966-04-21 1969-08-12 Cuccolini Silla Centrifugal separator
US3519200A (en) * 1967-10-10 1970-07-07 Alfa Laval Ab Method for indicating changes of liquid pressure in a centrifugal separator
US3630431A (en) * 1969-06-18 1971-12-28 Mitsubishi Kakoki Kk Valve-discharge disc centrifuge

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR819006A (fr) * 1937-03-10 1937-10-08 Perfectionnements apportés aux séparateurs centrifuges
DE1598204C3 (de) * 1964-04-14 1973-09-20 Tscheskoslovenska Akademie Ved., Prag Kontinuierlich arbeitende Düsen zentrifuge
FR1502206A (fr) * 1965-12-15 1967-11-18 Alfa Laval Ab Centrifugeuse à boue avec décharge intermittente de la boue
FR1598924A (es) * 1968-07-31 1970-07-15
DE2121329B2 (de) * 1971-04-30 1973-03-15 Westfalia Separator Ag, 4740 Oelde Duesentrommel zum konzentrieren von feststoffen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682992A (en) * 1951-11-02 1954-07-06 Int Harvester Co Power washing cream separator and threaded drive member therefor
US3460750A (en) * 1966-04-21 1969-08-12 Cuccolini Silla Centrifugal separator
US3519200A (en) * 1967-10-10 1970-07-07 Alfa Laval Ab Method for indicating changes of liquid pressure in a centrifugal separator
US3630431A (en) * 1969-06-18 1971-12-28 Mitsubishi Kakoki Kk Valve-discharge disc centrifuge

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432748A (en) * 1976-09-03 1984-02-21 Joy Manufacturing Company Centrifuge apparatus and method of operating a centrifuge
US4347971A (en) * 1977-03-03 1982-09-07 Joy Manufacturing Company Centrifuge apparatus
US4191325A (en) * 1977-08-12 1980-03-04 Alfa-Laval Ab Centrifuge with sludge outlets at rotor periphery
US4410318A (en) * 1980-09-26 1983-10-18 Alfa Laval Ab Method and arrangement to watch over separated sediment, which is thrown out through nozzles of a centrifugal separator
WO1982002153A1 (en) * 1980-12-23 1982-07-08 Co Inc Donaldson Self-purging centrifuge
US4350282A (en) * 1980-12-23 1982-09-21 Donaldson Company, Inc. Self-purging centrifuge
EP0205473B1 (en) * 1984-12-12 1989-03-15 Alfa-Laval Ab Outlet arrangement in a centrifugal separator
US4813923A (en) * 1987-02-09 1989-03-21 Alfa-Laval Separation Ab Centrifugal separator
US20030146146A1 (en) * 2000-06-08 2003-08-07 Wilfried Mackel Centrifuge with a sieve system and method for operating the same
US6969343B2 (en) * 2000-06-08 2005-11-29 Westfalia Separator Food Tec Gmbh Centrifuge with a sieve system and method for operating the same
WO2008140378A1 (en) * 2007-05-10 2008-11-20 Alfa Laval Corporate Ab Method and device for cleaning of a fluid in a centrifugal separator
US20100144508A1 (en) * 2007-05-10 2010-06-10 Alfa Laval Corporate Ab Method and device for cleaning of a fluid in a centrifugal separator
US8790233B2 (en) 2007-05-10 2014-07-29 Alfa Laval Corporate Ab Method and device for cleaning of a fluid in a centrifugal separator
US10357787B2 (en) 2009-03-06 2019-07-23 Alfa Laval Corporate Ab Centrifugal separator having energy consumption reducing devices
US10427171B2 (en) 2009-03-06 2019-10-01 Alfa Laval Corporate Ab Centrifugal separator having energy consumption reducing devices
US11396026B2 (en) 2009-03-06 2022-07-26 Alfa Laval Corporate Ab Centrifugal separator having energy consumption reducing devices

Also Published As

Publication number Publication date
JPS5742523Y2 (es) 1982-09-18
DE2214487C3 (es) 1989-05-18
SU566509A3 (ru) 1977-07-25
AU469102B2 (en) 1973-08-23
AU3917672A (en) 1973-08-23
FR2130206B1 (es) 1977-04-01
SE350911B (es) 1972-11-13
JPS56168257U (es) 1981-12-12
FR2130206A1 (es) 1972-11-03
DE2214487B2 (de) 1975-02-06
DE2214487A1 (de) 1972-10-05
DK132994B (da) 1976-03-08
CH532962A (de) 1973-01-31
AT317600B (de) 1974-09-10

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