EP0856360B1 - Vis pour séparateur centrifuge de l'huile d'olive - Google Patents

Vis pour séparateur centrifuge de l'huile d'olive Download PDF

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Publication number
EP0856360B1
EP0856360B1 EP19970121247 EP97121247A EP0856360B1 EP 0856360 B1 EP0856360 B1 EP 0856360B1 EP 19970121247 EP19970121247 EP 19970121247 EP 97121247 A EP97121247 A EP 97121247A EP 0856360 B1 EP0856360 B1 EP 0856360B1
Authority
EP
European Patent Office
Prior art keywords
scroll
baffles
drum
radially
axial
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
EP19970121247
Other languages
German (de)
English (en)
Other versions
EP0856360A2 (fr
EP0856360A3 (fr
Inventor
Alessandro Cornello
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.)
Cornello Centrifughe Srl
Original Assignee
Cornello Centrifughe Srl
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 Cornello Centrifughe Srl filed Critical Cornello Centrifughe Srl
Publication of EP0856360A2 publication Critical patent/EP0856360A2/fr
Publication of EP0856360A3 publication Critical patent/EP0856360A3/fr
Application granted granted Critical
Publication of EP0856360B1 publication Critical patent/EP0856360B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • 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
    • B04B2001/2041—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 with baffles, plates, vanes or discs attached to the conveying screw
    • 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
    • B04B2001/2058—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 with ribbon-type screw conveyor

Definitions

  • the present invention falls within the field of machines for separating olive oil. More particularly, the invention relates to an inner rotating scroll for a centrifugal separator with a horizontal axis of rotation.
  • centrifugal separators for extracting olive oil. These separators exploit the centrifugal separation principle to separate a composite mixture consisting of a paste of crushed olives into its components (oil, water, solid fraction). The separated components are then collected at distinct zones of the separator.
  • centrifugal separators comprise a central supply tube in which a crushed olive paste is let in.
  • a rotating drum of substantially truncated cone shape, formed by the union of adjacent cylindrical and truncated cone drum portions.
  • the solid phase being the heaviest, forms a radially outer layer on the peripheral wall of the drum.
  • the liquids, oil and water stratify radially in cylindrical coaxial layers in the radially innermost zone near the scroll. Specifically, beginning from the outside, the olive husk layer forms in the radially outer part of the drum, followed by an intermediate water layer and a radially inner oil layer.
  • the various separated phases are expelled from zones of the separator drum at axially different locations.
  • the solid olive husk phase is expelled by the rotating inner scroll from one end of the separator, the liquid phases at distinct ports at the axially opposite side.
  • the centrifugation creates a rotational speed gradient between the layers of different phases.
  • a rotational speed gradient is also present within a same layer, as the particles near a layer of another adjacent phase tend to be driven by this and therefore rotate at a different rotational speed with respect to the average angular speed of the particles belonging to a same layer.
  • the present invention provides a rotating inner scroll for a centrifugal separator with a horizontal axis for separating the liquid and solid phases from a paste of crushed olives, the scroll comprising an elongated central hub of substantially tubular shape and an outer drum of substantially truncated cone shape, and a plurality of axial baffles, which are oriented according to axial planes angularly equally spaced around the tubular hub, and radially extend between the tubular hub and the drum so as to form relevant barriers encompassing two boundary zones A and B separated by centrifugation and so as to define corresponding plurality of compartments open in radially outer directions, the inner scroll being characterised by the fact that said baffles are provided, in their radially inner zone, with at least one slit which extends for at least 2/3 of the axial length of the baffle to set the liquid present in adjacent compartments in direct fluid communication.
  • FIG. 1 and 2 which illustrate a well-known types of inner scroll
  • numeral 10 designates overall an inner rotating scroll for a centrifugal separator.
  • a conventional outer rotating drum of substantially truncated cone shape (not shown) is fitted around the scroll, said drum being formed by the union of adjacent cylindrical and truncated cone drum portions.
  • the scroll comprises an elongated central hub 14 of substantially tubular shape.
  • a paste of crushed olives is pumped into the drum through an opening 11 formed at one end of tubular hub 14, for separating by centrifugation the liquid phases (oil and water) and the solid phase (olive husk) composing said paste.
  • the olive paste is distributed radially by centrifugation from an inlet zone 12 located proximate to the opening 11 and closed by a radial wall 13.
  • the remainder of tubular hub 14, to the right of radial wall 13, is empty.
  • a dual spiral 15a, 15b of conventional design for conveying the olive husk accumulated in this peripheral part towards an outlet 16 proximate to the tapered axial end portion of the scroll (to the right in FIG. 1).
  • the two liquid phases, oil and water, are expelled through respective outlets (not shown) located at radially distinct levels near the left end portion of the scroll.
  • tubular hub 14 Fixed along the outer wall of tubular hub 14, preferably by welding, is a plurality of baffles or axial walls 20, oriented according to axial planes angularly equally spaced around the tubular hub 14.
  • the baffles 20 define a corresponding plurality of compartments 21 open in radially outer directions. More particularly, each compartment 21 is limited laterally by two consecutive baffles 20, and at the radially inner part by the cylindrical outer surface of tubular hub 14.
  • the baffles 20 provides that the three phases being separated (oil, water, olive husk) each maintain a uniform angular speed, equal to the rotational speed of the scroll. Owing to such an arrangement, the different layers are not allowed to gain relative rotational speed with respect to each other. As a result, a clear separation is obtained between the various phases, as schematically depicted by circles A and B shown in phantom line in FIG. 2. An improved and clearer distinction of the phases allows for an increased rate of oil being expelled, this implying an advantage from the production and economic point of view.
  • each compartment there can be clearly distinguished a radially inner oil zone 21a, an intermediate water zone 21b, and a radially outer zone 21c containing the solid phase.
  • the baffles 20 have a radial extension sufficient to form a barrier comprising the boundary zone A between the radially inner oil layer and the intermediate water layer adjacent to the oil layer.
  • the baffles 20 have a radial extension such as to form a barrier encompassing both the boundary zones A and B between the different liquid and solid phases separated by centrifugation.
  • baffles 20 may vary according to requirements. Obviously, better results are attained if more than one axial baffle is provided, as shown in the illustrated examples.
  • the clear separation of the phases allows the liquid phases also to be extracted with grater accuracy at different levels in the centrifugal separator.
  • the radial length of the baffles 20 varies following the shape of the scroll and the surrounding drum.
  • the radially outer edges 22 of the baffles 20 are at a substantially constant distance from the inner surface of the drum.
  • a constant cross section of the dual peripheral channel 17 is beneficial in that it is helpful in rendering the speed of the olive husk uniform and prevents the formation of constipated or empty zones which could adversely affect the separator efficiency.
  • the dual spiral 15a, 15b is welded to the outer edges 22 of baffles 20.
  • the axial length of the baffles 20 is preferably limited to the zone of the scroll where the liquid phases are present, i.e. the inlet portion (to the left) and the median portion. Where the scroll narrows, to the right end, only the solid phase is present and the baffles are no longer indispensable to achieve the desired scope.
  • the baffles 20 in order to render the level of the liquid phase, particularly the oil, uniform in all the compartments 21, the baffles 20 have one or more passages at their radially inner parts, near the attachment to the tubular hub 14.
  • the radially inner edges 24 of the baffles 20 are so shaped as to define with the tubular hub 14 one or more slits 23a setting adjacent compartments in direct fluid communication.

Landscapes

  • Centrifugal Separators (AREA)
  • Extraction Or Liquid Replacement (AREA)

Claims (5)

  1. Volute interne rotative (10) pour un séparateur centrifuge avec un axe horizontal destiné à séparer les phases liquide et solide d'une pâte d'olives pressées, la volute comportant un moyeu central allongé (14) de forme sensiblement tubulaire pour s'ajuster dans un tambour externe de forme sensiblement tronconique et une pluralité de déflecteurs axiaux (20) qui sont orientés selon des plans axiaux espacés également angulairement autour du moyeu tubulaire et qui s'étendent radialement entre le moyeu tubulaire (14) et le tambour, de façon à former des barrières appropriées entourant deux zones de frontières A et B séparées par centrifugation, et à définir une pluralité correspondante de compartiments (21) ouverts dans des directions radialement externes, la volute interne (10) étant caractérisée par le fait que lesdits déflecteurs (20) sont pourvus, dans leur zone radialement interne, d'au moins une fente (23a) qui se prolonge sur une partie substantielle de la longueur axiale du déflecteur, de façon à amener le liquide présent dans les compartiments adjacents (21) en communication fluidique directe.
  2. Volute selon la revendication 1, caractérisée en ce que les bords radialement externes (22) desdits déflecteurs (20) sont fixés à au moins une spirale (15) disposée autour de la partie périphérique de la volute (10).
  3. Volute selon la revendication 2, caractérisée en ce que les bords radialement externes (22) desdits déflecteurs (20) sont agencés à distance dudit tambour, de façon à définir avec ladite spirale et ledit tambour au moins un canal périphérique (17) de section transversale sensiblement constante.
  4. Volute selon la revendication 1, caractérisée en ce que la longueur axiale dudit au moins un déflecteur (20) est limitée à la longueur de la volute (10) dans laquelle les phases liquides sont présentes.
  5. Volute selon la revendication 1, caractérisée en ce que chaque compartiment (21) est limité latéralement par deux déflecteurs consécutifs (20)', et au niveau du côté radialement interne par la surface cylindrique externe dudit moyeu tubulaire.
EP19970121247 1996-12-05 1997-12-03 Vis pour séparateur centrifuge de l'huile d'olive Expired - Lifetime EP0856360B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO960990 1996-12-05
ITTO960990 IT1289718B1 (it) 1996-12-05 1996-12-05 Tamburo rotante con coclea interna per estrattore centrifugo per olio di oliva

Publications (3)

Publication Number Publication Date
EP0856360A2 EP0856360A2 (fr) 1998-08-05
EP0856360A3 EP0856360A3 (fr) 1999-02-03
EP0856360B1 true EP0856360B1 (fr) 2002-09-04

Family

ID=11415083

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970121247 Expired - Lifetime EP0856360B1 (fr) 1996-12-05 1997-12-03 Vis pour séparateur centrifuge de l'huile d'olive

Country Status (3)

Country Link
EP (1) EP0856360B1 (fr)
ES (1) ES2181975T3 (fr)
IT (1) IT1289718B1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1311908B1 (it) * 1999-04-06 2002-03-20 Nuova Maip Macchine Agric Procedimento per l'ottenimento di olio da oleaginose e simili mediantecentrifugazione con separazione della componente solida in due parti
DE10000789A1 (de) * 2000-01-11 2001-07-12 Frische Gmbh Zweiphasendekanter zum Trennen zweier flüssigr Phasen unterschiedlicher Dichte
ITMI20070345A1 (it) * 2007-02-22 2008-08-23 Nuova Maip Macchine Agricole Industriali Procedimento e apparecchiatura per la separazione e l'estrazione di differenti prodotti di paste di oleaginose e simili
DE102010020901A1 (de) * 2010-05-18 2011-11-24 Gea Mechanical Equipment Gmbh Vollmantel-Schneckenzentrifuge
CN102489416A (zh) * 2011-11-23 2012-06-13 江南大学 内循环卧式螺旋离心机
CN103657880B (zh) * 2013-12-18 2016-08-31 山东博润工业技术股份有限公司 分体式筛网沉降离心机螺旋输送器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578456A (en) * 1946-07-31 1951-12-11 Centrifuge Mechanical Equipmen Centrifugal separator
FR2449467A1 (fr) * 1979-02-23 1980-09-19 Saget Pierre Procede et appareil perfectionne le mettant en oeuvre pour la separation centrifuge d'au moins deux phases liquides d'un melange
DE2907318A1 (de) * 1979-02-24 1980-08-28 Bayer Ag Vollmantelschneckenzentrifuge mit angepasster schneckenwendel
US4743226A (en) * 1983-04-29 1988-05-10 Geosource Inc. High capacity continuous solid bowl centrifuge
US5354255A (en) * 1992-12-17 1994-10-11 Alfa Laval Separation Inc. Decanter centrifuge with conveyor capable of high speed and higher flow rates

Also Published As

Publication number Publication date
EP0856360A2 (fr) 1998-08-05
EP0856360A3 (fr) 1999-02-03
ITTO960990A1 (it) 1998-06-05
IT1289718B1 (it) 1998-10-16
ES2181975T3 (es) 2003-03-01

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