US3108067A - Centrifugal apparatus - Google Patents

Centrifugal apparatus Download PDF

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Publication number
US3108067A
US3108067A US137775A US13777561A US3108067A US 3108067 A US3108067 A US 3108067A US 137775 A US137775 A US 137775A US 13777561 A US13777561 A US 13777561A US 3108067 A US3108067 A US 3108067A
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US
United States
Prior art keywords
bowl
side wall
basket
centrifuge
screening
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
US137775A
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English (en)
Inventor
Dietzel Walter
Hillebrand Heinrich
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.)
BMA Braunschweigische Maschinenbauanstalt AG
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BMA Braunschweigische Maschinenbauanstalt AG
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • B04B7/18—Rotary bowls formed or coated with sieving or filtering elements

Definitions

  • This invention relates to centrifugal apparatus, and more particularly to centrifugal apparatus for continuous separation of the components of mixtures of solids and liquids.
  • centrifugal separators both the solid components and the liquid are con dnuously and separately discharged while the centrifuge runs at full speed.
  • Centrifugal apparatus for automatically and continuously separating solids and liquids of a mass of material containing these and using an upwardly widening centrifuge basket and a vessel underneath that basket are known.
  • Such vessels which have an imperforate side wall may be referred to as acceleration vessels.
  • the mixtures to be treated are centrally charged.
  • the mass is subjected in the acceleration vessel, in a gradually increasing manner, to the separating infiu ences of the forces due to rotation.
  • a mass of concentrated sugar syrup separates in sugar and molasses. Both sugar and molasses are whirled off, but the specifically heavier sugar crystals reach the imperforate side wall of the acceleration vessel before the molasses does.
  • the first or upper centrifuge means are generally constituted by what will be referred to hereinafter as a centrifuge basket or basket, and the second or lower centrifuge means are generally constituted by what will be referred to as a centrifuge bowl or bowl.
  • the invention enhances in a high degree the aforesaid advantage which results from charging the material to be treated closely adjacent the side wall of the bowl by providing the bowl with a perforate side wall and by further providing that the height of the bowl is not greater than substantially a fifth of the height of the basket.
  • the centrifugation which takes place in the bowl causes a liquid film to form between the perforate side wall of the bowl and separated solid particles, which liquid film forms constantly and moves on and greatly decreases abrasion of the solid particles.
  • height of the basket and bowl is meant the vertical distance that material has to ascend during the operation.
  • our present invention we provide two screening media, Wtih one of these media lining the inside of the side wall of the basket and the other screening medium lining the inside of the side wall of the bowl. Best results have been achieved, that is, the most tender treatment of solids separated in the bowl has been ensured by providing an effective screening surface in the bowl, that is less than substantially 10% of the effective screening surface in the basket.
  • FIG. 1 is a section taken in elevation through a centrifugal apparatus embodying features of the invention.
  • Both the side wall of the bowl and the side wall of the basket are interiorly lined with a screening medium 13 and 19*, respectively, each of the screening media being of a mesh size such as to permit passage of the liquid component of a mixture to be separated but to retain the solid component thereon.
  • Both screening media are preferably provided with hard chromium plating.
  • Conduits are provided above the centrifugal apparatus for charging the centrifuge bowl with the mixture to be treated.
  • a conduit 26' has an axial opening which is downwardly directed and faces a portion of the bottom 14 of the bowl, that is closely adjacent the side wall 15 of the bowl.
  • the mixture is discharged onto the bottom wall of the bowl closely adjacent the side wall thereof. Centrifugal forces exerted on the mixture have a separating influence upon the solids and the liquid phase of the mixture and force the components against the side wall of the bowl.
  • the present invention counteracts any abrading and disintegrating effect caused by the sliding of solid particles on a metallic side wall of a centrifuge by providing a centrifuge bowl, that is, a bowl having a perforated side wall, underneath a centrifuge basket and by giving the bowl a height of no more than substantially a fifth of the height of the basket.
  • a centrifuge bowl that is, a bowl having a perforated side wall
  • the bowl 13 has a height 17, that is,
  • height is meant the vertical distance which the components of a mixture have to move upwardly in the bowl and basket, respectively. It has been found that the referred to height relation is conducive to the formation of a liquid film between the screening medium in the bowl and separated solid particles. Such film decreases the friction relative to the side wall of the bowl. The solid particles, while still within the centrifuge bowl, contain the highest amount of liquid and have therefore the lowest coefficient of both internal friction and friction relative to the side wall 15, and this condition is strongly helped by the formation of the referred to liquid film, making it safe for separated solid particles to be in contact with a steep side wall, such as the wall 15 of cylindrical shape.
  • a different requisite of an effective separation and at the same time of a gentle treatment of separated solid particles is a certain relation between the areas of the screening media of bowl and basket.
  • the invention provides that the effective screening surface of the bowl is less than substantially of the effective screening surface of the basket.
  • the solids retained on the screens 18 and 19' are gradually moved upwardly by the axial component of the centrifugal force until they are discharged over the upper rim of the side wall 17 and drop into a compartment 25 formed between the intermediate housing wall 23 and an outer housing wall 26 of the apparatus.
  • the side wall of the basket which is generally of upwardly widening conical shape is given a greater angle of inclination with respect to the shaft or the vertical axis of the apparatus than the side wall of the bowl.
  • the invention makes use of a bowl of relatively small diameter having a side wall which forms the steepest portion of the bowl-basket combination, and it provides that the side wall of the bowl is perforated. Although the centrifugal force exerted on separated solids in the bowl is relatively small, it has been found that the difference in circumferential speeds of the side wall of the bowl and the solids has a harmful effect on the solid particles.
  • the present invention overcomes this disadvantage by giving the bowl a height of no more than substantially a fifth of the height of the basket or by providing an effective screening surface in the bowl, that is less than substantially 10% of the effective screening surface of the basket.
  • the provision of bowl and basket as different units offers the advantage of a wide range of adjustment possibilities. While the requirements of the invention for the height and effective screening surface relation, as far as bowl and basket are concerned, must be satisfied, it remains possible to combine less or more steep bowls with the same basket or kind of basket, or the same kind of bowl with different shapes of baskets.
  • Centrifugal apparatus for continuous separation of the components of a mixture, comprising a support, a shaft mounted on said support for rotation about a substantially vertical axis, a centrifuge basket and a centrifuge bowl mounted to be operated by said shaft, and two screening media, said bowl being disposed under said basket and having a height of no more than substantially a fifth of the heighth of said basket, each of said basket and bowl having an at least partly perforated side wall, both of said side Walls being coaxial with said shaft, the side wall of said bowl being of substantially cylindrical shape, the side wall of said basket having a generally upwardly widening conical shape and constituting an angular upward continuation of the side wall of said bowl, a first of said screening media lining the inside of the side wall of said basket, the second of said media lining the inside of the side wall of said bowl, the effective screening surface of said second screening medium being less than substantially 10% of the effective screening surface of said first screening medium.
  • said apparatus further comprising means for charging said mixture onto said bottom closely adjacent the side wall of said bowl.

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  • Centrifugal Separators (AREA)
US137775A 1960-10-14 1961-09-13 Centrifugal apparatus Expired - Lifetime US3108067A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB59760A DE1144192B (de) 1960-10-14 1960-10-14 Zentrifuge mit einer um eine lotrechte Achse umlaufenden, sich nach oben erweiternden Schleudertrommel zum Zentrifugieren viskoser Zuckermassen nach dem Duennschichtprinzip

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US3108067A true US3108067A (en) 1963-10-22

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US137775A Expired - Lifetime US3108067A (en) 1960-10-14 1961-09-13 Centrifugal apparatus

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US (1) US3108067A (de)
DE (1) DE1144192B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3275153A (en) * 1963-10-17 1966-09-27 Hein Lehmann & Co A G Sieve-centrifuge
US4302332A (en) * 1979-07-06 1981-11-24 Nishihara Environmental Sanitation Research Corp., Ltd. Centrifugal thickener
US4762570A (en) * 1986-08-22 1988-08-09 Braunschweigische Maschinenbauanstalt Ag Continuously operable sugar centrifuge
US4922625A (en) * 1988-03-03 1990-05-08 Process Equipment Company Sectionalized centrifugal drying basket/screen assembly
US4961722A (en) * 1989-11-30 1990-10-09 Guyan Machinery Co. Conical screen for a vertical centrifugal separator
EP0887109A2 (de) * 1997-06-27 1998-12-30 Braunschweigische Maschinenbauanstalt AG Kontinuierliche Zentrifuge
WO2003033163A1 (en) * 2001-10-18 2003-04-24 Wdt (Engineers) Pty Ltd Continuous centrifuge
EP1752484A1 (de) * 2004-05-26 2007-02-14 Bridgestone Corporation Verfahren zur entsorgung von dichtungsmittel und vorrichtung dafür

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1634868A (en) * 1922-02-18 1927-07-05 Guy H Elmore Centrifugal drier
US3050190A (en) * 1959-02-25 1962-08-21 Hein Lehman & Co Ag Centrifuges

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE925818C (de) * 1952-09-16 1955-03-31 Siteg Siebtech Gmbh Verschleissfester Siebbelag fuer Siebzentrifugen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1634868A (en) * 1922-02-18 1927-07-05 Guy H Elmore Centrifugal drier
US3050190A (en) * 1959-02-25 1962-08-21 Hein Lehman & Co Ag Centrifuges

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3275153A (en) * 1963-10-17 1966-09-27 Hein Lehmann & Co A G Sieve-centrifuge
US4302332A (en) * 1979-07-06 1981-11-24 Nishihara Environmental Sanitation Research Corp., Ltd. Centrifugal thickener
US4762570A (en) * 1986-08-22 1988-08-09 Braunschweigische Maschinenbauanstalt Ag Continuously operable sugar centrifuge
US4922625A (en) * 1988-03-03 1990-05-08 Process Equipment Company Sectionalized centrifugal drying basket/screen assembly
US4961722A (en) * 1989-11-30 1990-10-09 Guyan Machinery Co. Conical screen for a vertical centrifugal separator
EP0887109A2 (de) * 1997-06-27 1998-12-30 Braunschweigische Maschinenbauanstalt AG Kontinuierliche Zentrifuge
EP0887109A3 (de) * 1997-06-27 1999-11-03 Braunschweigische Maschinenbauanstalt AG Korbeinsätze für kontinuierliche arbeitende Zentrifuge
US20040245325A1 (en) * 2001-10-08 2004-12-09 Eastaughffe Gordon Francis Continuous centrifuge
WO2003033163A1 (en) * 2001-10-18 2003-04-24 Wdt (Engineers) Pty Ltd Continuous centrifuge
US7208048B2 (en) 2001-10-18 2007-04-24 Wdt (Engineers) Pty. Ltd. Continuous centrifuge
EP1752484A1 (de) * 2004-05-26 2007-02-14 Bridgestone Corporation Verfahren zur entsorgung von dichtungsmittel und vorrichtung dafür
EP1752484A4 (de) * 2004-05-26 2012-03-07 Bridgestone Corp Verfahren zur entsorgung von dichtungsmittel und vorrichtung dafür

Also Published As

Publication number Publication date
DE1144192B (de) 1963-02-21

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