EP0341433B1 - Solid bowl screw conveyor centrifuge - Google Patents

Solid bowl screw conveyor centrifuge 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
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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
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EP89106271A
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German (de)
French (fr)
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EP0341433A2 (en
EP0341433A3 (en
Inventor
Walter Dipl.-Ing. Kreill (Fh)
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Flottweg GmbH
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Flottweg GmbH
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Priority claimed from DE19883816210 external-priority patent/DE3816210A1/en
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Publication of EP0341433A3 publication Critical patent/EP0341433A3/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
    • B04B1/20—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)

Description

Die Erfindung bezieht sich auf eine Vollmantel-Schneckenzentrifuge, insbesondere Gegenstromzentrifuge, für die Trennung einer Suspension, für deren Zuführung von einer ortsfesten Eingabestelle außerhalb der Zentrifuge in den zwischen der Schnecke und dem Mantel gebildeten Trennraum der Zentrifuge ein ortsfest gehaltenes Einlaufrohr vorgesehen ist, das sich bis in einem Einlaufraum der Schnecke erstreckt und in seinem dortigen Endbereich an einem schneckenfesten Teil über ein Lager abgestützt ist.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.

In solchen Zentrifugen werden unter Fliehkraft Suspensionen in eine feste und wenigstens eine flüssige Phase getrennt. Solche Suspensionen können aus vielerlei Zusammensetzungen bestehen, sie können chemisch agressive Stoffe und/oder hohen Abrieb verursachende Partikel, wie beispielsweise Sand, enthalten. Man ist daher bestrebt, im Rahmen der Zuführung solcher Suspensionen möglichst durchgehende Leitungen bis hin zum Trennraum der Zentrifuge bzw. einen in den Trennraum mündenden Verteilerraum innerhalb der Schneckennabe zu verwenden. Dabei treten vielfach große Rohrlängen auf, die hinsichtlich ihrer Halterung bzw. ihrer Gefahr, starke radiale Schwingungen auszuführen, Probleme bereiten. Dies ist vor allem bei Zentrifugen der hier in Rede stehenden Art der Fall, die im sogenannten Gegenstromprinzip arbeiten, d.h. bei denen der Suspensionseinlauf in den Trennraum weit im Inneren der Zentrifuge vorgesehen ist. Eine Lagerung eines solchen langen ortsfesten Einlaufrohres in dessen Endbereich innerhalb der Schneckennabe könnte zwar diese Problematik beseitigen, doch ist ein solches Lager innerhalb der Schneckennabe stärker der Verschmutzung ausgesetzt und für Wartungsarbeiten nur sehr schwer zugänglich. Eine derartige Lagerung ist aus der GB-A-2088255 bekannt, und zwar in Form eines mit einer Dichtung geschützten Wälzlagers innerhalb eines Gehäuses. Aufgrund der starken Beanspruchung eines solchen Lagers durch zu trennende Suspensionen sind zeit-und kostenintensive Reparaturen bzw. Wartungsarbeiten zu befürchten, ganz abgesehen vom verhältnismäßig komplizierten mehrteiligen Aufbau.In centrifuges of this type, 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. This is particularly the case with centrifuges of the type in question here, which operate in the so-called countercurrent principle, ie in which the suspension inlet into the separation space is provided far inside the centrifuge. Storage of such a long, stationary inlet pipe in its end region within the worm hub could indeed eliminate this problem, but such a bearing is within the Worm hub more exposed to dirt and difficult to access for maintenance work. Such storage is known from GB-A-2088255, in the form of a roller bearing protected with a seal within a housing. Due to the heavy stress on such a bearing due to suspensions to be separated, time-consuming and costly repairs and maintenance work are to be feared, quite apart from the relatively complicated multi-part construction.

Aus der DE-U-8706954 sind Gleitlager für Pumpen bekannt, deren eine Lagerschale aus Siliziumkarbid und deren andere Lagerschale aus einem mit diesem keramischen Werkstoff gut als Lager zusammenarbeitenden Werkstoff besteht. Zwischen der Lagerschale aus keramischem Werkstoff (Siliziumkarbid) und dem Träger für diese Laufbuchse ist eine Zwischenbuchse aus Metall angeordnet, die sich axial überschneidende, ringspaltförmige Freiräume zur Aufnahme der unterschiedlichen Wärmedehnungen zur Verfügung stellt. Desweiteren ist bekannt - DE-A-3435821 - Gleitlager zur Verfügung zu stellen, deren eine Lagerschale aus Keramikmaterial und deren andere Lagerschale aus Hartmetall besteht, wodurch ein Betrieb sowohl in trockenem als auch im "nassem" Zustand ermöglicht werden soll. Zur Aufnahme von Schwingungen kann im Bereich des Lagers eine elastische Zwischenschicht vorgesehen sein. Im Zusammenhang damit ist weiterhin bekannt, die eine Lagerschale durch Schrumpfpassung in einem Gehäuseglied festzulegen. Schließlich ist es bekannt - EP-A-0195205 - besonders oberflächenbehandelte Gleitelemente zur Verfügung zu stellen, die insbesondere als Dichtscheiben in Mischbatterien und Gleitringe von Gleitringdichtungen Verwendung finden sollen.From DE-U-8706954 plain bearings for pumps are known, the one bearing shell made of silicon carbide and the other bearing shell made of a material which cooperates well with this ceramic material as a bearing. An intermediate bush made of metal is arranged between the bearing shell made of ceramic material (silicon carbide) and the carrier for this bushing, which provides axially overlapping, annular-gap-shaped free spaces for absorbing the different thermal expansions. Furthermore, it is known - DE-A-3435821 - to provide plain bearings, one bearing shell of which is made of ceramic material and the other of which is made of hard metal, whereby operation in both dry and "wet" condition is to be made possible. To absorb vibrations, an elastic intermediate layer can be provided in the area of the bearing. In connection with this, it is also known to fix a bearing shell in a housing member by a shrink fit. Finally, it is known - EP-A-0195205 - to provide especially surface-treated sliding elements which are to be used in particular as sealing disks in mixer taps and sliding rings of mechanical seals.

Der Erfindung liegt die Aufgabe zugrunde, eine Zentrifuge der eingangs genannten Art zur Verfügung zu stellen, bei der die Suspension möglichst weitgehend bis zum Eintritt in den Trennraum der Zentrifuge über ein feststehendes Einlaufrohr zugeführt wird, auch wenn sich der Trennraum sehr weit von der Zuführstirnseite des Zentrifugenmantels aus gesehen im Längsmittelbereich und darüber hinaus der Zentrifuge befindet, wie dies bei Gegenstrom-Zentrifugen der Fall ist, ohne daß das derart lang ausgebildete, feststehende Einlaufrohr Betriebsstörungen durch entsprechend große radiale Schwingungen verursachen kann und ohne daß zeit- und kostenintensive Reparatur- und/oder Wartungsarbeiten auftreten.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.

Ausgehend von einer Vollmantel-Schneckenzentrifuge mit den eingangs genannten Merkmalen wird diese Aufgabe erfindungsgemäß dadurch gelöst, daß das Lager als Gleitlager ausgebildet ist, dessen beide Lagerschalen im Gleitangriffsbereich aus einem keramischen Werkstoff bestehen, zwischen deren aneinander gleitenden Lagerschalenflächen sich ein hydrodynamischer Schmierfilm aufbaut, der mittels der durch das Einlaufrohr in den Trennraum eingeleiteten Suspension und/oder mittels einer durch eine separate Leitung zugeführten Ersatzflüssigkeit gespeist ist, und daß die radial innen angeordnete Lagerschale mit ihrer Innenmantelfläche über einen zwischengeschalteten Temperaturspannungs-Ausgleichskörper an einem Abschnitt der Außenwandung des die Lagerschale haltenden Bauelementes festgelegt ist.Starting from a solid-bowl screw centrifuge with the features mentioned above, this object is achieved according to the invention in that 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.

Erfindungsgemäß ist das entsprechend weit im Inneren der Schnecke der Zentrifuge angeordnete Gleitlager derart ausgebildet, daß die beiden Lagerschalen im Gleitangriffsbereich aus einem keramischen Werkstoff bestehen. Im Gleitangriffsbereich werden die beiden keramischen Lagerschalen durch die Suspension beaufschlagt, was jedoch hinsichtlich des Verschleißes und/oder der Wartung keine Probleme bereitet, weil solche keramischen Werkstoffe äußerst widerstandsfähig gegen Abrasionen und Korrisionen sind, so daß sich ein solches mit im Gleitangriffsbereich keramisch ausgebildeten Gleitlager auch bei Suspensionen entsprechender Abriebs- und Korrisionseigenschaften sicher und dauerhaft einsetzen läßt. Solche Gleitlager vertragen hohe Drehzahlen und halten auch einem Druckaufbau stand, wie er vom Trennraum her bei bestimmter Lageranordnung auftreten kann. Darüber hinaus sind solche keramischen Werkstoffe hoch hitzebeständig und vertragen starke Temperaturwechsel.According to the invention, 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. In the sliding attack area, 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. In addition, such ceramic materials are highly heat-resistant and tolerate strong temperature changes.

Es kommt eine Reihe von Keramik-Materialien in Frage, wobei dieser oder jener Keramik-Werkstoff je nach Einsatzzweck bzw. Suspension zu bevorzugen sein wird, so beispielsweise auch Si₃N₄, Al₂O₃, MgO, ZrO₂; vorzugsweise werden jedoch oxidfreie Keramiken verwendet und bevorzugt SiC, und zwar in gesinterter Form, so daß man reines Siliziumkarbit ohne freien Siliziumanteil enthält.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.

Grundsätzlich ist es möglich, die radial außen angeordnete Lagerschale des Gleitlagers an einer der Stirnbegrenzungswandungen des Einlaufraumes der Schneckennabe festzulegen, während die radial innen angeordnete Lagerschale des Gleitlagers an der Außenwandung des feststehenden bzw. ortsfest gehaltenen Einlaufrohres festgelegt ist. Eine andere Möglichkeit besteht darin, die radial innen angeordnete Lagerschale des Gleitlagers auf einem an der Stirnbegrenzungswandung des Einlaufraumes festgelegten Bolzen, auch Hohlbolzen, zu halten und die radial außenliegende Lagerschale des Gleitlagers am Endrand des Endbereiches des ortsfesten Einlaufrohres oder einer Erweiterung dieses Endbereiches festzulegen. Der Endbereich des Einlaufrohres kann auch mittelbar, beispielsweise über ein weiteres konzentrisch innenliegendes Rohr an einer Trennwand des Schneckenkörpers abgestützt sein.Basically, it is possible to fix the radially outer bearing shell of the slide bearing on one of the end boundary walls of the inlet space of the worm hub, while the radially inner bearing shell of the sliding bearing is fixed on the outer wall of the fixed or stationary inlet pipe. Another possibility is to hold the bearing shell of the slide bearing arranged radially on the inside on a bolt, also hollow bolt, fixed to the end wall of the inlet space and to fix the bearing shell of the slide bearing radially on the outside at the end edge of the end region of the stationary inlet pipe or an extension of this end region. The end region of the inlet pipe can also be supported indirectly, for example via a further concentrically inner pipe, on a partition of the screw body.

Erfindungsgemäß ist dafür Sorge getragen, daß sich zwischen den aneinander gleitenden Lagerschalenflächen des Gleitlagers durch Anwesenheit eines flüssigen Mediums ein hydrodynamischer Schmierfilm aufbaut. Dies geschicht dadurch, daß das Gleitlager mit dem Innenraum des Einlaufrohres in Verbindung steht und durch das über das Einlaufrohr in den Trennraum der Zentrifuge eingeleitete Schleudermedium geschmiert wird. Es kann aber auch eine Ersatzflüssigkeit zur Schmierung des Gleitlagers vorgesehen sein, die bei Unterbrechung der Zugabe des Schleudermediums selbsttätig zugeführt wird. Dabei ist für die Zuführung der Schmierflüssigkeit zum Gleitlager eine separate Leitung vorgesehen. Weiterhin kann die Temperatur des Gleitlagers mit Hilfe von Temperaturfühlern abgetastet werden, so daß bei Anstieg der Temperatur des Gleitlagers über einen bestimmten Wert die Schmiermittelversorgung des Gleitlagers selbsttätig eingeschaltet oder die Zentrifuge abgeschaltet wird.According to the invention, care is taken to ensure that a hydrodynamic lubricating film is present between the sliding bearing shell surfaces of the slide bearing due to the presence of a liquid medium builds up. This is due to the fact that 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. However, 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. Furthermore, 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.

In einem konischen Bereich der Zentrifuge, der der Abführung des Feststoffes aus dem Sumpf des Trennraumes dient, kann im Schneckenkörper ein Hohlraum zur Einleitung von Waschflüssigkeit vorgesehen sein, wobei im Übertrittsbereich einer stationären Zuleitung für die Waschflüssigkeit auf den umlaufenden Schneckenkörper das Gleitlager zugleich als Dichtung eingesetzt ist. In einem solchen Falle, indem ein Waschflüssigkeitszuführrohr über das Lager an dem Schneckennabenkörper abgestützt ist, kann das Einlaufrohr an dem Waschflüssigkeitszuführrohr abgestützt sein, so daß der Endbereich des Einlaufrohres mittelbar über das Gleitlager an der Schneckennabe abgestützt ist.In a conical area of the centrifuge, which is used to discharge the solid from the sump of the separation space, 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. In such a case, 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.

In besonders bevorzugter Ausführung kann Sorge dafür getragen werden, daß eine Inspektion dieses im Inneren der Schnecke, d.h. im Bereich des Einlaufraumes der Schnecke, gelegenen keramischen Lagers in einfacher Weise ohne Demontage der Zentrifuge erfolgen kann.In a particularly preferred embodiment, 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.

Diese und weitere bevorzugte Ausführungen der Erfindung ergeben sich aus den Unteransprüchen, insbesondere im Zusammenhang mit den in der Zeichnung wiedergegebenen Ausführungsbeispielen der Erfindung, deren nachfolgende Beschreibung die Erfindung näher erläutert. Es zeigen

Figur 1
einen schematischen Schnitt durch eine Vollmantel-Schneckenzentrifuge nach einem ersten Ausführungsbeispiel;
Figur 2
eine vergrößerte Teilschnittdarstellung des Schneckenbereiches im Gebiet des Einlaufraumes nach einem weiteren Ausführungsbeispiel;
Figur 3
einen der Darstellung gemäß Figur 2 vergleichbaren Schnitt eines dritten Ausführungsbeispieles;
Figur 4
einen der Darstellung gemäß Figur 2 vergleichbaren Schnitt eines vierten Ausführungsbeispieles;
Figur 5
einen der Darstellung gemäß Figur 2 vergleichbaren Schnitt eines letzten Ausführungsbeispieles.
These and other preferred embodiments of the invention result from the subclaims, in particular in connection with the exemplary embodiments of the invention shown in the drawing, the following description of which explains the invention in more detail. Show it
Figure 1
a schematic section through a solid bowl screw centrifuge according to a first embodiment;
Figure 2
an enlarged partial sectional view of the screw area in the area of the inlet space according to a further embodiment;
Figure 3
a section comparable to the illustration of Figure 2 of a third embodiment;
Figure 4
a section of the fourth embodiment comparable to the illustration in FIG. 2;
Figure 5
one of the representation of Figure 2 section comparable to a last embodiment.

Die mit einem Mantel 1 und einer Schnecke 2 ausgerüstete Vollmantel-Schneckenzentrifuge gemäß Ausführungsbeispiel ist lediglich hinsichtlich der an der Zuführseite der Suspension befindlichen Stirnseite bzw. Lagerung und in dem Einlaufbereich in den zwischen dem Mantel 1 und der Schnecke 2 gebildeten Trennraum 3 wiedergegeben. Die Schnecke 2 ist bei 4 an dem Mantel gelagert, dieser wiederum bei 5 an einem ortsfesten Bauteil 6, das hier als Lagerbock angesehen wird. Diese in Figur 1 wiedergegebene Ausführung ist in den übrigen Figuren lediglich hinsichtlich des Einlaufraumbereiches innerhalb der Zentrifuge vergrößert wiedergegeben.The solid-bowl screw centrifuge equipped with a jacket 1 and a screw 2 according to the exemplary embodiment 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.

Das Einlaufrohr 31 für die Zuführung der Suspension ist von der nicht dargestellten ortsfesten Eingabestelle der Suspension im rechten Anschlußbereich der Figur 1 als ortsfest stehendes Rohr bis in den Einlaufraum 32 der Schnecke 2 hineingeführt und mit seinem dortigen Endbereich 34 an einem Bolzen 35 abgestützt, der seinerseits in eine in der der Einlaufseite abgewandten Stirnbegrenzungswandung 36 des Einlaufraumes 32 vorgesehene Bohrung 37 eingreift. Radial zwischen dem Bolzen 35 und der inneren Endwandung des Endbereiches 34 des lang ausgebildeten ortsfesten Einlaufrohres 31 ist ein Gleitlager 12 mit den beiden Lagerschalen 14 und 15 angeordnet, so daß eine Abstützung zwischen dem Bolzen 35 und dem Endbereich 34 des Einlaufrohres 31 gegen radiale Schwingungsbewegungen gegeben ist. Die Suspension tritt in Richtung des Pfeiles rechts in das lang ausgebildete Einlaufrohr 31 ein und verläßt dieses durch die Austrittsöffnung 33, die in den Einlaufraum 32 der Schnecke 2 führt, von wo aus die Suspension in üblicher Weise durch Öffnungen in der Schneckennabe in den Trennraum 3 gelangt. Aufgrund der durch das Einlaufrohr 31 aufgegebenen Suspension und deren Aufenthalt in dem Einlaufraum 32 der Schnecke 2 ist das Gleitlager 12 von beiden Stirnseiten her der Suspension ausgesetzt. Die Suspension dient der Bildung eines hydrodynamischen Schmierfilmes für das Gleitlager 12, andererseits sind dessen Laufflächen der von der Suspension ausgehenden Beanspruchung ausgesetzt. Die beiden aneinander gleitend angreifenden Lagerschalen 14 und 15 des Gleitlagers 12 sind aus einem keramischen Werkstoff, hier insbesondere Siliziumkarbit, hergestellt, so daß Abrasions- und Korrisionserscheinungen durch die schmiergelnde Wirkung der Suspensionsfeststoffe an den Gleitflächen nicht oder nur entsprechend geringfügig auftritt.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. Radially between the bolt 35 and the inner end wall of the end region 34 of the long, fixed inlet pipe 31, 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.

Bei dem Ausführungsbeispiel gemäß Figur 1 kann man davon ausgehen, daß das mit dem Gleitlager 12 und dem Bolzen 35 vormontierte Einlaufrohr 31 in die gezeigte Lage von außerhalb der insoweit vormontierten Maschine in Längsrichtung des Einlaufrohres 31 eingeführt wird, wobei der Bolzen 35 über eine beliebige Ausbildung verdrehfest in die Bohrung 37 eingreift. Durch den umgekehrten Montagevorgang läßt sich das Lager leicht inspizieren bzw. auswechseln, ohne daß die Zentrifuge als solche demontiert werden muß.In the embodiment according to FIG. 1, it can be assumed that the inlet pipe 31 preassembled with the slide bearing 12 and the pin 35 is inserted into the position shown from outside the machine, which has been preassembled in this respect, in the longitudinal direction of the inlet pipe 31, the pin 35 having any configuration engages torsionally in the bore 37. The reverse assembly process makes it easy to inspect or replace the bearing without having to dismantle the centrifuge as such.

Bei dem Ausführungsbeispiel gemäß Figur 2 ist die Halterung des Endbereiches 34 des Einlaufrohres 31 an einem Bolzen 35 in ähnlicher Weise getroffen wie bei dem Ausführungsbeispiel gemäß Figur 1. Hier ist allerdings ein Sechskant vorgesehen, der es erlaubt, die Lagerschale 14 von dem Bolzen abzuziehen.In the exemplary embodiment according to FIG. 2, 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. Here, however, a hexagon is provided which allows the bearing shell 14 to be removed from the bolt.

Beim Ausführungsbeispiel gemäß Figur 2 ist nämlich eine besondere Schmiermittelzufuhr über eine Leitung 39 für den Fall vorgesehen, daß die Suspensionszufuhr unterbrochen wird. Während also die durch die Austrittsöffnung 33 in den Einlaufraum 32 eintretende Suspension die Bildung des hydrodynamischen Schmierfilmes zwischen den Lagerschalen 14 und 15 spätestens von der dem Einlauf abgewandten Stirnseite sicherstellt, wird bei Unterbrechung der Suspensionszufuhr durch die Leitung 39 ein wie auch immer geartetes Schmiermittel zugeführt, das den hydrodynamischen Schmierfilm zwischen den Lagerschalen 14 und 15 aufrechterhält.In the exemplary embodiment according to FIG. 2, a special lubricant supply is provided via a line 39 in the event that the suspension supply is interrupted. Thus, while 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.

Im Bereich des Gleitlagers können dabei ein oder mehrere Temperaturfühler vorgesehen sein, durch welche bei Anstieg der Temperatur des Gleitlagers die besondere Schmiermittelzufuhr zu dem Gleitlager selbsttätig eingeschaltet wird. Natürlich kann man hier auch eine Notabschaltung der Zentrifuge vorsehen.In the area of the plain bearing, 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. Of course, you can also provide an emergency shutdown of the centrifuge here.

Bei dem Ausführungsbeispiel gemäß Figur 3 ist die Abstützung des Endbereiches 34 des Einlaufrohres 31 über das Gleitlager 12 bzw. dessen Lagerschalen 14 und 15 in ähnlicher Weise wie bei dem Ausführungsbeispiel in Figur 2 getroffen, jedoch ist der Bolzen, an dem die innere Lagerschale 14 beispielsweise über einen Ausgleichskörper 16 gehalten ist, als Hohlbolzen 38 ausgebildet, der eine axial durchgehende Bohrung aufweist. Die der Einlaufseite zugewandte Öffnung dieser durchgehenden Bohrung ist auf einen Einlauf zu gerichtet, der ähnlich demjenigen der Notlaufschmierflüssigkeit gemäß Figur 2 ausgebildet ist, im vorliegenden Ausführungsbeispiel gemäß Figur 3 jedoch der Zuführung einer Waschflüssigkeit dient, die somit die Schmierung des Lagers 12 sicherstellt und gleichzeitig eine Waschflüssigkeit in den Innenraum der Schnecke zuführt, der sich an die dem Suspensionseinlauf abgewandte Wandung 36 des Einlaufraumes 32 anschließt. Dieser Raum weist in der Schneckennabe kleine Durchtrittsbohrungen auf, durch welche die Waschflüssigkeit in den Trennraum der Zentrifuge gelangt, und zwar in dessen konischen Mantelbereich, um Feststoffe abzuspülen.In the exemplary embodiment according to FIG. 3, 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. 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.

Der Ausgleichskörper 16 dient der Kompensation von temperaturbedingten Maßänderungen, er ist in radialer Richtung elastisch nachgiebig ausgebildet. Damit wird erreicht, daß bei Temperaturerhöhung der sich stärker dehnende Mantel des Endbereiches 34 des Einlaufrohres 31 bzw. - im Hinblick auf Figur 1 - die Durchmessererhöhung des Bolzens 35 die sich bei dieser Temperatur weit weniger ausdehnende keramische Lagerschale auf Zug belastet, wogegen der keramische Werkstoff empfindlich ist. Der rohrförmige Ausgleichskörper weist eine in sich wellige Mantelwandung auf, und zwar mit dem Wellenverlauf in Umfangsrichtung gesehen, oder auch mit dem Wellenverlauf in Achsrichtung gesehen, wie dies in der Zeichnung angedeutet ist. Die radial äußere Lagerschale ist - je nach Ausführungsbeispiel an der Innenmantelwandung des Endbereiches 34 des Einlaufrohres 31 oder der Wandung 36 bzw. 43 (Figur 5) des Schneckenkörpers - dadurch befestigt, daß dieser vor Einsetzen der Lagerschale 15 aufgeheizt wird. Bei Abkühlung führen die unterschiedlichen Wärmeausdehnungskoeffizienten des Einlaufrohres bzw. der Schneckenkörperwandung - beispielsweise Stahl - einerseits und des Keramikörpers andererseits dazu, daß die Lagerschale durch Schrumpfen in ihrer Position festgelegt und somit zusammengedrückt wird, wogegen der Keramikwerkstoff unempfindlich ist.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. When cooling, 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.

Bei dem Ausführungsbeispiel gemäß Figur 4 ist die Zuführung von Waschflüssigkeit mit Hilfe eines Waschflüssigkeitszuführrohres 40 getroffen, das in sich starr ist und als Verbindung zwischen dem Gleitlager 12 und dem Endbereich 34 des Einlaufrohres 31 insoweit dient, als die Innenwandung des Endbereiches 34 des Einlaufrohres 31 über radiale Stege 42 an der Außenmantelwandung des Waschflüssigkeitszuführrohres 40 abgestützt ist. Diese Abstützung erfolgt im Nahbereich des Gleitlagers 12, welches im Durchtrittsbereich des Waschflüssigkeitszuführrohres 40 durch die der Einlaufseite abgewandte stirnseitige Wandung 36 des Einlaufraumes 32 angeordnet ist. Dabei ist die äußere Lagerschale 15 an der Innenwandung einer entsprechenden Bohrung in der Trennwand abgestützt, während die innere Lagerschale 14 an der Außenmantelwandung des Waschflüssigkeitszuführrohres 40 abgestützt ist. Hier bildet demnach das Gleitlager 12 eine Dichtung zwischen dem Raum, in den die Waschflüssigkeit eingeleitet wird, und dem Einlaufraum 32, in den das Einlaufrohr 31 stirnseitig mündet.In the exemplary embodiment according to FIG. 4, 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.

Bei dem Ausführungsbeispiel gemäß Figur 5 dagegen ist wieder ein sehr einfacher Fall der Suspensionszuführung gezeigt, bei welchem Notlaufschmierung und Waschflüssigkeitszufuhr nicht vorgesehen sind. In diesem Falle ist das Gleitlager 12 im Durchtrittsbereich des Einlaufrohres 31 durch diejenige stirnseitige Trennwandung 43 des Einlaufraumes 32 der Schnecke 2 angeordnet, die dem Suspensionseinlauf zugewandt liegt. Die Außenschale des Gleitlagers 12 ist an der Innenwand einer entsprechenden Bohrung in der Stirntrennwandung 43 abgestützt, während die innere Lagerschale 14 an der äußeren Mantelfläche des Einlaufrohres 31 angreift.In the exemplary embodiment according to FIG. 5, on the other hand, a very simple case of the suspension supply is again shown, in which emergency lubrication and washing liquid supply are not provided. In this case, 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.

Claims (9)

  1. A fully encased screw centrifuge, more particularly a counterflow centrifuge, for separating a suspension, for the supply thereof from a stationary delivery point outside the centrifuge into the separation area (3) of the centrifuge, formed between the screw (2) and the casing (1), there is provided a fixedly held inlet pipe (31) which extends into an inlet area (32) of the screw (2) and is supported, in its end region (34) there, via a bearing, on a part (36,35; 36,38; 36; 43) secured to the screw, characterised in that the bearing is constructed as a slide bearing (12) whose two bearing bushes (14, 15) are made of a ceramic material in the region of the sliding engagement, a hydrodynamic lubrication film being built up between the faces of the bearing bushes sliding against each other, which is supplied by means of the suspension passed through the inlet pipe (31) into the separation area (3) and/or by means of a substitute liquid delivered through a separate pipe (39; 40), and that the bearing bush (14) arranged radially inside is secured, by means of its inner wall face, via an interposed thermal stress compensating member (16), to a portion of the outer wall of the structural element retaining the bearing bush.
  2. A centrifuge according to claim 1, characterised in that the ceramic material of the slide bearing (12) is oxide-free ceramics, more particularly made of or based on pure silicon carbide.
  3. A centrifuge according to either claim 1 or 2, characterised in that the bearing bush (15) arranged radially outside is secured on its outer side so as to be acted upon by shrinkage pressure.
  4. A centrifuge according to any one of claims 1 to 3, characterised in that the temperature-compensating member (16) is in the form of a radially resilient ring or tube section, in particular having a circumferential wall which, itself, is corrugated.
  5. A centrifuge according to any one of claims 1 to 4, characterised in that the substitute liquid for lubricating the slide bearing is supplied automatically in the event of the delivery of the suspension being interrupted.
  6. A centrifuge according to any one of claims 1 to 5, characterised in that one or a plurality of temperature sensors are provided within the region of the slide bearing (12) which automatically switch on the lubrication supply of the slide bearing or switch the centrifuge off, when the temperature of the slide bearing increases above a specific value.
  7. A centrifuge according to any one of claims 1 to 6, characterised in that the screw member is provided, in the conical region of the centrifuge, with a cavity for introducing washing liquid, and that in the region, in which the stationary inlet pipe for the washing liquid passes over into the rotating screw member, the slide bearing (12) is arranged as a seal.
  8. A centrifuge according to any one of claims 1 to 7, characterised in that the washing liquid inlet pipe (40) is mounted as a stationary pipe in the screw, via the slide bearing (12) with the ceramic bearing bushes (14, 15), and that the inlet pipe (31) which serves to supply the suspension is supported (42) on the washing liquid inlet pipe (40).
  9. A centrifuge according to any one of claims 1 to 4, characterised in that the inlet pipe (31) is supported, via the slide bearing (12), in the separation end wall (43) of the inlet area (32) of the centrifuge.
EP89106271A 1988-05-11 1989-04-10 Solid bowl screw conveyor centrifuge Expired - Lifetime EP0341433B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883816210 DE3816210A1 (en) 1986-11-12 1988-05-11 Solid-bowl worm centrifuge
DE3816210 1988-05-11

Publications (3)

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

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EP (1) EP0341433B1 (en)
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Also Published As

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

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