EP0341433B1 - Centrifugeuse à vis à bol plein - Google Patents

Centrifugeuse à vis à bol plein Download PDF

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Publication number
EP0341433B1
EP0341433B1 EP89106271A EP89106271A EP0341433B1 EP 0341433 B1 EP0341433 B1 EP 0341433B1 EP 89106271 A EP89106271 A EP 89106271A EP 89106271 A EP89106271 A EP 89106271A EP 0341433 B1 EP0341433 B1 EP 0341433B1
Authority
EP
European Patent Office
Prior art keywords
bearing
centrifuge
inlet pipe
screw
slide bearing
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
EP89106271A
Other languages
German (de)
English (en)
Other versions
EP0341433A3 (en
EP0341433A2 (fr
Inventor
Walter Dipl.-Ing. Kreill (Fh)
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.)
Flottweg GmbH
Original Assignee
Flottweg GmbH
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
Priority claimed from DE19883816210 external-priority patent/DE3816210A1/de
Application filed by Flottweg GmbH filed Critical Flottweg GmbH
Publication of EP0341433A2 publication Critical patent/EP0341433A2/fr
Publication of EP0341433A3 publication Critical patent/EP0341433A3/de
Application granted granted Critical
Publication of EP0341433B1 publication Critical patent/EP0341433B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/12—Suspending rotary bowls ; Bearings; Packings for bearings
    • 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
    • B04B2001/2033—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 feed accelerator inside the conveying screw

Definitions

  • the invention relates to a solid-bowl screw centrifuge, in particular a countercurrent centrifuge, for the separation of a suspension, for the supply of which from a stationary entry point outside the centrifuge into the separation space of the centrifuge formed between the screw and the shell, a stationary inlet pipe is provided, which is provided extends into an inlet space of the screw and is supported in its end region on a screw-fixed part via a bearing.
  • suspensions are separated into a solid and at least one liquid phase under centrifugal force.
  • Such suspensions can consist of many different compositions; they can contain chemically aggressive substances and / or particles that cause high abrasion, such as sand. It is therefore endeavored, in the course of the supply of such suspensions, to use lines which are as continuous as possible up to the separating space of the centrifuge or a distribution space which opens into the separating space within the screw hub. Large pipe lengths often occur, which cause problems with regard to their mounting or their risk of producing strong radial vibrations.
  • the invention has for its object to provide a centrifuge of the type mentioned, in which the suspension is fed as far as possible into the separating chamber of the centrifuge via a fixed inlet pipe, even if the separating chamber is very far from the feed end of the Centrifuge jacket as seen in the longitudinal center area and beyond the centrifuge, as is the case with countercurrent centrifuges, without the long, fixed Inlet pipe can cause malfunctions due to large radial vibrations and without time-consuming and costly repair and / or maintenance work.
  • the bearing is designed as a plain bearing, the two bearing shells of which are made of a ceramic material in the sliding engagement area, and a hydrodynamic lubricating film builds up between their sliding bearing shell surfaces the suspension introduced through the inlet pipe into the separation space and / or is fed by means of a substitute liquid supplied through a separate line, and that the radially inner bearing shell is fixed with its inner lateral surface to a section of the outer wall of the component holding the bearing shell by means of an intermediate temperature-tension compensating body is.
  • the slide bearing is arranged correspondingly far inside the screw of the centrifuge in such a way that the two bearing shells in the sliding engagement area consist of a ceramic material.
  • the two ceramic bearing shells are acted upon by the suspension, which, however, poses no problems with regard to wear and / or maintenance, because such ceramic materials are extremely resistant to abrasion and corrosion, so that such a bearing with a ceramic bearing in the sliding attack area also can be used safely and permanently for suspensions with appropriate abrasion and corrosion properties.
  • Tolerate such plain bearings high speeds and also withstand a pressure build-up, as can occur in a certain bearing arrangement from the separation space.
  • such ceramic materials are highly heat-resistant and tolerate strong temperature changes.
  • Ceramic materials in question there are a number of ceramic materials in question, and this or that ceramic material will be preferred depending on the application or suspension, such as Si3N4, Al2O3, MgO, ZrO2; however, oxide-free ceramics are preferably used, and preferably SiC, in a sintered form, so that pure silicon carbide is contained without a free silicon content.
  • the plain bearing is connected to the interior of the inlet pipe and is lubricated by the centrifugal medium introduced into the separating chamber of the centrifuge via the inlet pipe.
  • a replacement liquid for lubricating the slide bearing can also be provided, which is automatically supplied when the addition of the centrifugal medium is interrupted.
  • a separate line is provided for the supply of the lubricant to the slide bearing.
  • the temperature of the slide bearing can be sensed with the aid of temperature sensors, so that when the temperature of the slide bearing rises above a certain value, the lubricant supply to the slide bearing is automatically switched on or the centrifuge is switched off.
  • a cavity for the introduction of washing liquid can be provided in the screw body, the sliding bearing also being used as a seal in the transition area of a stationary supply line for the washing liquid to the rotating screw body is.
  • the inlet pipe in that a washing liquid supply pipe is supported on the bearing on the worm hub body, the inlet pipe can be supported on the washing liquid supply pipe so that the end region of the inlet pipe is supported indirectly on the sliding bearing on the worm hub.
  • care can be taken to ensure that an inspection of this ceramic bearing located inside the screw, ie in the area of the screw's inlet space, can be carried out in a simple manner without dismantling the centrifuge.
  • the solid-bowl screw centrifuge equipped with a jacket 1 and a screw 2 is only shown with regard to the end face or storage located on the feed side of the suspension and in the inlet area into the separation space 3 formed between the casing 1 and the screw 2.
  • the screw 2 is mounted at 4 on the casing, which in turn at 5 on a stationary component 6, which is viewed here as a bearing block.
  • This embodiment shown in FIG. 1 is shown enlarged in the remaining figures only with regard to the inlet area area within the centrifuge.
  • the inlet pipe 31 for the supply of the suspension is led from the stationary entry point of the suspension, not shown, in the right connection area of FIG. 1 as a stationary pipe into the inlet space 32 of the screw 2 and is supported with its end area 34 on a bolt 35, which in turn is supported engages in a bore 37 provided in the end boundary wall 36 of the inlet space 32 facing away from the inlet side.
  • a slide bearing 12 with the two bearing shells 14 and 15 is arranged, so that there is a support between the bolt 35 and the end region 34 of the inlet pipe 31 against radial vibratory movements is.
  • the suspension enters the long-shaped inlet pipe 31 in the direction of the arrow on the right and leaves it through the outlet opening 33, which leads into the inlet chamber 32 of the screw 2, from where the suspension in the usual way through openings in the screw hub into the separation chamber 3 reached. Due to the suspension given up through the inlet pipe 31 and its presence in the inlet chamber 32 of the screw 2, the slide bearing 12 is exposed to the suspension from both end faces.
  • the suspension is used to form a hydrodynamic lubricating film for the plain bearing 12, on the other hand, its running surfaces are exposed to the stress emanating from the suspension.
  • the two mutually sliding bearing shells 14 and 15 of the slide bearing 12 are made of a ceramic material, here in particular silicon carbide, so that abrasion and corrosion phenomena due to the lubricating effect of the suspension solids on the sliding surfaces does not occur or only occurs accordingly.
  • the end region 34 of the inlet pipe 31 is held on a bolt 35 in a similar manner as in the exemplary embodiment according to FIG. 1.
  • a hexagon is provided which allows the bearing shell 14 to be removed from the bolt.
  • a special lubricant supply is provided via a line 39 in the event that the suspension supply is interrupted.
  • the suspension entering the inlet space 32 through the outlet opening 33 forms the formation of the hydrodynamic lubricating film between the bearing shells 14 and 15 at the latest from the Ensures the end face facing away from the inlet, if the suspension supply is interrupted through line 39, a lubricant of whatever type is supplied which maintains the hydrodynamic lubricating film between the bearing shells 14 and 15.
  • one or more temperature sensors can be provided, by means of which the special lubricant supply to the plain bearing is automatically switched on when the temperature of the plain bearing rises.
  • the end region 34 of the inlet pipe 31 is supported via the slide bearing 12 or its bearing shells 14 and 15 in a similar manner as in the exemplary embodiment in FIG. 2, but the bolt on which the inner bearing shell 14 is, for example is held by a compensating body 16, formed as a hollow pin 38 which has an axially continuous bore.
  • the opening of this through hole facing the inlet side is directed towards an inlet which is similar to that of the emergency lubricating fluid according to FIG. 2, but in the present exemplary embodiment according to FIG.
  • washing liquid 3 serves to supply a washing liquid, which thus ensures the lubrication of the bearing 12 and at the same time ensures a Feeds washing liquid into the interior of the screw, which adjoins the wall 36 of the inlet space 32 facing away from the suspension inlet.
  • This space has small passage bores in the screw hub, through which the washing liquid enters the separating space of the centrifuge, specifically in its conical jacket area, in order to wash off solids.
  • the compensating body 16 serves to compensate for temperature-related dimensional changes; it is designed to be elastically flexible in the radial direction. This ensures that when the temperature increases, the more stretching jacket of the end region 34 of the inlet pipe 31 or - with respect to FIG. 1 - the diameter increase of the bolt 35 stresses the ceramic bearing shell, which expands much less at this temperature, while the ceramic material is sensitive.
  • the tubular compensating body has a corrugated jacket wall in itself, with the wave shape seen in the circumferential direction, or also with the wave shape seen in the axial direction, as indicated in the drawing.
  • the radially outer bearing shell is - depending on the embodiment on the inner jacket wall of the end portion 34 of the inlet pipe 31 or the wall 36 or 43 ( Figure 5) of the screw body - fixed in that it is heated before inserting the bearing shell 15.
  • the different coefficients of thermal expansion of the inlet pipe or the screw body wall - for example steel - on the one hand and the ceramic body on the other hand mean that the bearing shell is fixed in position by shrinking and thus compressed, whereas the ceramic material is insensitive.
  • the supply of washing liquid is made with the aid of a washing liquid supply pipe 40 which is rigid in itself and serves as a connection between the slide bearing 12 and the end region 34 of the inlet pipe 31 insofar as the inner wall of the end region 34 of the inlet pipe 31 over radial webs 42 is supported on the outer jacket wall of the washing liquid supply pipe 40.
  • This support takes place in the vicinity of the slide bearing 12, which is in the passage area of the washing liquid supply pipe 40 is arranged through the end wall 36 of the inlet space 32 facing away from the inlet side.
  • the outer bearing shell 15 is supported on the inner wall of a corresponding hole in the partition, while the inner bearing shell 14 is supported on the outer jacket wall of the washing liquid supply pipe 40. Accordingly, the slide bearing 12 forms a seal between the space into which the washing liquid is introduced and the inlet space 32, into which the inlet pipe 31 opens at the end.
  • the sliding bearing 12 is arranged in the passage area of the inlet pipe 31 through that end partition 43 of the inlet chamber 32 of the screw 2 which faces the suspension inlet.
  • the outer shell of the slide bearing 12 is supported on the inner wall of a corresponding bore in the end partition 43, while the inner bearing shell 14 engages on the outer circumferential surface of the inlet pipe 31.

Landscapes

  • Centrifugal Separators (AREA)
  • Sliding-Contact Bearings (AREA)

Claims (9)

  1. Centrifugeuse à vis à bol plein, notamment centrifugeuse à contre-courant, pour le fractionnement d'une suspension, pour son introduction on prévoit depuis une zone fixe d'alimentation à l'extérieur de la centrifugeuse dans la chambre de séparation (3) de la centrifugeuse formée entre la vis (2) et le bol (1), un tube d'alimentation (31) fixe, qui s'étend jusqu'à une chambre d'alimentation (32) de la vis (2) et qui s'appuie via un palier dans sa zone terminale (34) sur une pièce solidaire de la vis (36, 35 ; 36, 38 ; 36, 43), caractérisée en ce que le palier est réalisé en palier lisse (12) dont les deux garnitures (14, 15) sont constituées dans le domaine de glissement mutuel d'un matériau céramique, qui entre les faces de garnitures de palier en glissement l'une sur l'autre, se constitue un film lubrifiant hydrodynamique, qui est injecté au moyen de la suspension introduite dans la chambre de séparation (3) par le tube (31) d'alimentation et/ou au moyen d'un liquide de remplacement introduit par une conduite particulière (39, 40) et que la garniture de palier (14) disposée radialement à l'intérieur est fixée par l'intermédiaire d'un corps de compensation (16) de contrainte de température sur une partie de la paroi externe de l'élément constitutif maintenant la garniture de palier.
  2. Centrifugeuse selon la revendication 1, caractérisée en ce que le matériau céramique du palier lisse (12) est une céramique exempte d'oxyde, notamment constituée à partir de carbure de silicium pur.
  3. Centrifugeuse selon la revendication 1 ou 2, caractérisée en ce que la garniture (15) placée radialement à l'extérieur, est fixée par sa face externe en contrainte de compression par retrait.
  4. Centrifugeuse selon l'une des revendications 1 à 3, caractérisée en ce que le corps de compensation de température (16) est en forme de bague radialement élastique ou en élément de tube notamment avec une paroi d'enveloppe ondulée.
  5. Centrifugeuse selon l'une des revendications 1 à 4, caractérisée en ce que le liquide de remplacement pour lubrifier le palier lisse en cas d'interruption d'arrivée de suspension, est introduit automatiquement.
  6. Centrifugeuse selon l'une des revendications 1 à 5, caractérisée en ce que dans la zone du palier lisse (12) on prévoit un ou plusieurs capteurs de température qui, en cas d'augmentation de température du palier lisse au-delà d'une valeur déterminée, déclenchent automatiquement l'alimentation en lubrifiant du palier lisse on arrête la centrifugeuse.
  7. Centrifugeuse selon l'une des revendications 1 à 6, caractérisée en ce que le corps de vis dans la zone conique de la centrifugeuse est muni d'une chambre vide pour introduire du liquide de rinçage et que dans la zone de traversée du tube fixe d'introduction de liquide de rinçage sur le corps de la vis, le palier lisse (12) sert en même temps de joint.
  8. Centrifugeuse selon l'une des revendications 1 à 7, caractérisée en ce que le tube d'amenée de liquide de rinçage (40) en tant que tube stationnaire, est logé via le palier lisse (12) dans des garnitures céramiques (14, 15) dans la vis et que le tube (31) d'alimentation servant à l'introduction de la suspension s'appuie (42) sur le tube (40) d'amenée de liquide de rinçage.
  9. Centrifugeuse selon l'une des revendications 1 à 4, caractérisée en ce que le tube d'alimentation (31) s'appuie via le palier lisse (12) dans la paroi de séparation frontale (43) de la chambre d'alimentation (32) de la centrifugeuse, paroi tournée vers l'alimentation de la suspension.
EP89106271A 1988-05-11 1989-04-10 Centrifugeuse à vis à bol plein Expired - Lifetime EP0341433B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883816210 DE3816210A1 (de) 1986-11-12 1988-05-11 Vollmantel-schneckenzentrifuge
DE3816210 1988-05-11

Publications (3)

Publication Number Publication Date
EP0341433A2 EP0341433A2 (fr) 1989-11-15
EP0341433A3 EP0341433A3 (en) 1990-04-25
EP0341433B1 true EP0341433B1 (fr) 1993-08-04

Family

ID=6354231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89106271A Expired - Lifetime EP0341433B1 (fr) 1988-05-11 1989-04-10 Centrifugeuse à vis à bol plein

Country Status (4)

Country Link
US (1) US4957475A (fr)
EP (1) EP0341433B1 (fr)
JP (1) JPH01317560A (fr)
DK (1) DK228589A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012018241A1 (de) * 2012-09-17 2014-03-20 Gea Mechanical Equipment Gmbh Separator

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4002066A1 (de) * 1990-01-25 1991-08-01 Basf Ag Verfahren zur abtrennung von riboflavin aus fermentationssuspensionen
US5156751A (en) * 1991-03-29 1992-10-20 Miller Neal J Three stage centrifuge and method for separating water and solids from petroleum products
US5403486A (en) * 1991-12-31 1995-04-04 Baker Hughes Incorporated Accelerator system in a centrifuge
US5364335A (en) * 1993-12-07 1994-11-15 Dorr-Oliver Incorporated Disc-decanter centrifuge
EP0868215B1 (fr) * 1995-12-01 2002-01-30 Baker Hughes Incorporated Procede de commande et de surveillance d'une centrifugeuse a alimentation en continu et appareil correspondant
US8328877B2 (en) 2002-03-19 2012-12-11 Boston Scientific Scimed, Inc. Stent retention element and related methods
DK200970026A (en) * 2009-06-12 2010-12-13 Alfa Laval Corp Ab A centrifugal separator
US8651240B1 (en) 2012-12-24 2014-02-18 United Technologies Corporation Pressurized reserve lubrication system for a gas turbine engine
EP2913112B1 (fr) * 2014-02-26 2020-06-17 Ferrum AG Centrifugeuse et procédé de chargement d'une centrifugeuse
JP2017189752A (ja) * 2016-04-15 2017-10-19 日本フローサーブ株式会社 立型固液分離装置
DE202017104036U1 (de) * 2017-07-06 2018-10-09 Gea Mechanical Equipment Gmbh Vollmantel-Schneckenzentrifuge
DE102018119279A1 (de) * 2018-08-08 2020-02-13 Gea Mechanical Equipment Gmbh Vollmantel-Schneckenzentrifuge
EP4295957A1 (fr) * 2022-06-24 2023-12-27 Hermeler, Jürgen Centrifugeuse décanteuse

Citations (6)

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Publication number Priority date Publication date Assignee Title
DE1442497A1 (de) * 1964-02-14 1968-11-14 United States Steel Corp Verfahren und Vorrichtung zur Wasserabscheidung durch Zentrifugalwirkung unter Einwirkung von Dampf
FR2016986A1 (fr) * 1968-08-20 1970-05-15 Bird Machine Co
DE2160493A1 (de) * 1971-12-07 1973-06-14 Erich Rosenthal Verteilerring fuer pneumatische medien zum schmieren und kuehlen von rotierenden reibungsflaechen
DE3435821A1 (de) * 1983-09-30 1985-05-02 Ebara Corp Kombination mit gleitgliedern
EP0195205A2 (fr) * 1985-03-16 1986-09-24 CERASIV GmbH INNOVATIVES KERAMIK-ENGINEERING Elément de glissement couvert d'une couche de matériaux céramiques et l'utilisation de celui-ci
DE8706954U1 (de) * 1987-05-14 1987-07-02 Hermetic-Pumpen Gmbh, 7803 Gundelfingen Gleitlager für Pumpen

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FR1251684A (fr) * 1960-03-18 1961-01-20 Krupp Dolberg Gmbh Machine centrifuge à vis sans fin
US3172851A (en) * 1962-08-31 1965-03-09 Centrifuging liquid-solids mixtures
US3379368A (en) * 1965-12-06 1968-04-23 Gilreath Hydraulies Inc Centrifugal separator
US3568919A (en) * 1968-01-10 1971-03-09 Titan Separator As Screw centrifuge
US3854658A (en) * 1973-05-07 1974-12-17 Dorr Oliver Inc Solid bowl conveyer type centrifuge
US4334647A (en) * 1980-12-03 1982-06-15 Bird Machine Company, Inc. Centrifuges
DE3326310C2 (de) * 1983-07-21 1986-02-20 Westfalia Separator Ag, 4740 Oelde Vollmantelzentrifuge mit einer Förderschnecke
DE3638652A1 (de) * 1986-11-12 1988-06-01 Flottweg Bird Mach Gmbh Vollmantel-schneckenzentrifuge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1442497A1 (de) * 1964-02-14 1968-11-14 United States Steel Corp Verfahren und Vorrichtung zur Wasserabscheidung durch Zentrifugalwirkung unter Einwirkung von Dampf
FR2016986A1 (fr) * 1968-08-20 1970-05-15 Bird Machine Co
DE2160493A1 (de) * 1971-12-07 1973-06-14 Erich Rosenthal Verteilerring fuer pneumatische medien zum schmieren und kuehlen von rotierenden reibungsflaechen
DE3435821A1 (de) * 1983-09-30 1985-05-02 Ebara Corp Kombination mit gleitgliedern
EP0195205A2 (fr) * 1985-03-16 1986-09-24 CERASIV GmbH INNOVATIVES KERAMIK-ENGINEERING Elément de glissement couvert d'une couche de matériaux céramiques et l'utilisation de celui-ci
DE8706954U1 (de) * 1987-05-14 1987-07-02 Hermetic-Pumpen Gmbh, 7803 Gundelfingen Gleitlager für Pumpen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012018241A1 (de) * 2012-09-17 2014-03-20 Gea Mechanical Equipment Gmbh Separator
DE102012018241B4 (de) * 2012-09-17 2014-12-18 Gea Mechanical Equipment Gmbh Separator

Also Published As

Publication number Publication date
DK228589A (da) 1989-11-12
US4957475A (en) 1990-09-18
EP0341433A3 (en) 1990-04-25
EP0341433A2 (fr) 1989-11-15
DK228589D0 (da) 1989-05-10
JPH01317560A (ja) 1989-12-22

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