EP0544263A1 - Solid bowl screw centrifuge with a structured inner bowl surface - Google Patents
Solid bowl screw centrifuge with a structured inner bowl surface Download PDFInfo
- Publication number
- EP0544263A1 EP0544263A1 EP92120108A EP92120108A EP0544263A1 EP 0544263 A1 EP0544263 A1 EP 0544263A1 EP 92120108 A EP92120108 A EP 92120108A EP 92120108 A EP92120108 A EP 92120108A EP 0544263 A1 EP0544263 A1 EP 0544263A1
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- European Patent Office
- Prior art keywords
- drum
- adhesive coating
- centrifuge according
- solid
- bowl
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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
Definitions
- the invention relates to a solid-bowl screw centrifuge for separating suspension into at least one liquid phase and solid, which settles under centrifugal force on the inside of the drum facing the screw and from the screw rotating at a relatively low speed of rotation to the drum along the inside of the drum to the one in the in particular, conically constricting, axial end region of the drum located solid discharge is promoted, the inner drum surface being provided with a structuring which hinders movement of the solid in the drum circumferential direction.
- the solid that settles on the inner surface of the drum due to the centrifugal force during operation of the centrifuge should be conveyed by the screw as quickly as possible to the solid ejection (ejection openings in the jacket), in particular in order to keep friction and wear low.
- the solid that occurs between the inner surface of the drum and the spiral of the screw tends, due to the differential movement between the screw and the drum, to have an in Movement component pointing circumferentially to be displaced along the inside wall of the drum, so that an approximately spiral path is established toward the discharge of solids.
- the inner surface of the drum has already been provided with grooves or strips or knurling has been applied in order to improve the adhesion of the solid against movements in the drum circumferential direction on the inner surface of the drum.
- the frictional stress of the screw is countered by armoring the outer areas of the screw, for example by coating with ceramic powder, tungsten carbide or the like, which coating is smoothed with regard to its surface after application in order to keep the frictional resistance of the solid on the screw as low as possible.
- Such armor coatings have also been provided in the area of the aforementioned groove or bar designs on the inner surface of the drum.
- the invention is based on the object of making the preparation of the drum inner surface as simple as possible in order to prevent wear-promoting and increasing the drive power requirement in the circumferential direction of the drum.
- this object is achieved according to the invention in that the surface structuring is formed by an adhesive coating thinly sprayed onto the inner surface of the drum, the coating of which faces the screw Surface is rough.
- the adhesive coating extends over the entire circumference of the drum, covering the entire surface, that is to say without interruption.
- the adhesive coating can also be restricted to partial areas, that is to say it is only designed to cover part of the area.
- the strip-like adhesive coating can, however, also extend in the form of a screw or helix, namely under any possible incline with the exception of the helical pitch.
- the streak can So be directed in the same direction as the helix course, right-handed or left-handed in adaptation to the snail used in each case, or also in such a way that the helical or helical stripe formation of the adhesive coating opposes the sense of pitch of the helix of the snail used.
- the adhesive coating is carried out until the solids are discharged, which basically applies to each selected coating pattern.
- the adhesive layer itself can be relatively thin, in particular less than 0.5 mm in the radial direction.
- the adhesive layer can consist of plastic, ceramic, tungsten carbide, natural and / or synthetic granular materials, mixtures of these substances can be provided, in particular granular materials will be used in binding materials, as is known per se from grinding tools, in particular grinding wheels . It is only necessary that these substances or mixtures are sprayable in order to be applied. Subsequent hardening can take place depending on time and / or temperature. The rough surface towards the separation area results from the spraying on of the adhesive layer of its own accord, so this does not require any post-treatment after the spraying.
- the solid-bowl screw centrifuge shown in the drawing has a drum 1 in a generally conventional design and a screw 2 which is arranged coaxially with it and rotates with the drum at a differential speed, the radially outer peripheral spiral regions of which extend into the vicinity of the inner drum surface, so that through the inlet pipe 4 into the separation space 3 formed between drum 1 and screw 2 in the direction of the arrows, when the drum rotates at high spin speed under the influence of centrifugal force, it separates into a liquid phase and a solid phase.
- the liquid flows over a weir at 6 on one axial end face of the drum, while the solids, which settle under centrifugal force on the inside of the drum, are conveyed from the helix of the screw 2 to the solids discharge 5 at the other axial end of the drum, specifically in such a way that the solid grinds against the screw spiral and the inner wall of the drum.
- the inner drum surface is provided with an adhesive coating 7, which is thin and is sprayed onto the inner drum surface.
- the adhesive layer which can consist of granular hard material held in a plastic bond and has a rough surface facing the screw, opposes the circumferential movement of the solid with a correspondingly high frictional resistance, so that the smooth helical screw conveys the solid mainly in the axial direction. This keeps the drive power and wear on the centrifuge parts low.
- the inside of the drum which can be seen in FIG. 1 on the basis of the sectional view there, shows that the adhesive coating 7 extends over the entire inside surface of the drum in the circumferential direction and until the solid is discharged throughout.
- the adhesive coating 7 ' is divided into a number - for example six pieces, each about 50 mm wide - i.e. the adhesive coating composition is only sprayed onto the inner surface of the drum at appropriate intervals and otherwise distributed in a rotationally symmetrical manner.
- FIG. 3 shows an adhesive coating 7 ′′ of the inner surface of the drum, which is formed from a helically extending strip.
- Several of such helices can be nested in the axial direction.
- the strip-shaped helix according to FIG. 3 runs in the same circumferential direction as the worm helix, but with an incline that deviates from that of the worm helix, so that there is a sweeping movement of the outer periphery of the worm helix relative to the strip-shaped coating.
- the order of magnitude is wide Limits selectable.
- FIG. 4 shows an adhesive coating 7 ′′ ′′ in the form of a helical strip which runs in the direction opposite to that of the screw spiral in its circumferential direction, so that it is inevitable that the screw spiral is swept over the spiral strip.
- a plurality of spiral courses of strip-shaped adhesive coatings can be nested one inside the other like a multi-flight screw.
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Abstract
Description
Die Erfindung betrifft eine Vollmantel-Schneckenzentrifuge zur Trennung von Suspension in wenigstens eine Flüssigphase und Feststoff, der sich unter Fliehkrafteinfluß an der der Schnecke zugewandten Trommelinnenfläche absetzt und von der mit verhältnismäßig geringer Differenzdrehzahl zu der Trommel umlaufenden Schnecke entlang der Trommelinnenfläche zu dem in dem einen, insbesondere sich konisch verengend ausgebildeten, axialen Endbereich der Trommel gelegenen Feststoffaustrag gefördert wird, wobei die Trommelinnenfläche mit einer eine Bewegung des Feststoffes in Trommelumfangsrichtung behindernden Strukturierung versehen ist.The invention relates to a solid-bowl screw centrifuge for separating suspension into at least one liquid phase and solid, which settles under centrifugal force on the inside of the drum facing the screw and from the screw rotating at a relatively low speed of rotation to the drum along the inside of the drum to the one in the in particular, conically constricting, axial end region of the drum located solid discharge is promoted, the inner drum surface being provided with a structuring which hinders movement of the solid in the drum circumferential direction.
Der sich aufgrund der Fliehkrafteinwirkung bei Betrieb der Zentrifuge an der Trommelinnenfläche absetzende Feststoff soll von der Schnecke auf möglichst kurzem Wege zu dem Feststoffauswurf (Auswurföffnungen im Mantel) gefördert werden, dies insbesondere deshalb, um Reibung und Verschleiß gering zu halten. Der zwischen Trommelinnenfläche und Schneckenwendel auftretende Feststoff tendiert aufgrund der Differenzbewegung zwischen Schnecke und Trommel dazu, mit einer in Umfangsrichtung weisenden Bewegungskomponente an der Trommelinnenwandung entlang verschoben zu werden, so daß sich zum Feststoffaustrag hin ein etwa spiraliger Weg einstellt. Um dies zu verhindern und den Feststoff möglichst in Achsrichtung der Zentrifugentrommel zu fördern, hat man bereits die Trommelinnenfläche mit Nuten oder Leisten versehen oder auch eine Rändelung angebracht, um die Haftung des Feststoffes gegen Bewegungen in Trommelumfangsrichtung an der Trommelinnenfläche zu verbessern. Der Reibbeanspruchung der Schnecke begegnet man durch Panzerung der äußeren Schneckenwendelbereiche, beispielsweise durch Beschichtung mit Keramikpulver, Wolframkarbid oder dergleichen, welche Beschichtung hinsichtlich ihrer Oberfläche nach dem Aufbringen geglättet wird, um den Reibwiderstand des Feststoffes an der Schneckenwendel so gering wie möglich zu halten. Solche Panzerbeschichtungen hat man auch im Bereich der vorerwähnten Nut- bzw. Leistenausbildungen an der Trommelinnenfläche vorgesehen. Durch diese Profilierungen der Mantelinnenfläche in Achsrichtung hat man bereits versucht, durch Aufnahme einer Sedimentschicht als Vorlage den Verschleiß der hochbeanspruchten Trommelmantelinnenfläche bei Verschieben des Feststoffes durch die Schnecke entgegen zu wirken.The solid that settles on the inner surface of the drum due to the centrifugal force during operation of the centrifuge should be conveyed by the screw as quickly as possible to the solid ejection (ejection openings in the jacket), in particular in order to keep friction and wear low. The solid that occurs between the inner surface of the drum and the spiral of the screw tends, due to the differential movement between the screw and the drum, to have an in Movement component pointing circumferentially to be displaced along the inside wall of the drum, so that an approximately spiral path is established toward the discharge of solids. In order to prevent this and to convey the solid as far as possible in the axial direction of the centrifuge drum, the inner surface of the drum has already been provided with grooves or strips or knurling has been applied in order to improve the adhesion of the solid against movements in the drum circumferential direction on the inner surface of the drum. The frictional stress of the screw is countered by armoring the outer areas of the screw, for example by coating with ceramic powder, tungsten carbide or the like, which coating is smoothed with regard to its surface after application in order to keep the frictional resistance of the solid on the screw as low as possible. Such armor coatings have also been provided in the area of the aforementioned groove or bar designs on the inner surface of the drum. By profiling the inner surface of the shell in the axial direction, attempts have already been made to counteract the wear of the highly stressed inner surface of the drum when the solid is moved by the screw by incorporating a sediment layer as a template.
Die Ausbildung von Nuten, Leisten oder Rändelungen an der Trommelinnenwand verlangt eine ziemlich aufwendige Herstellung.The formation of grooves, strips or knurls on the inside of the drum requires a fairly complex production.
Der Erfindung liegt die Aufgabe zugrunde, die Aufbereitung der Trommelinnenfläche zur Behinderung einer den Verschleiß begünstigenden und den Antriebsleistungsbedarf erhöhenden Feststoffbewegung in Umfangsrichtung der Trommel möglichst einfach zu gestalten.The invention is based on the object of making the preparation of the drum inner surface as simple as possible in order to prevent wear-promoting and increasing the drive power requirement in the circumferential direction of the drum.
Ausgehend von einer Zentrifuge mit den eingangs genannten Merkmalen wird diese Aufgabe erfindungsgemäß dadurch gelöst, daß die Oberflächenstrukturierung durch eine auf die Trommelinnenfläche dünn aufgespritzte Haftbeschichtung gebildet ist, deren der Schnecke zugewandte Oberfläche rauh ist.Starting from a centrifuge with the features mentioned in the introduction, this object is achieved according to the invention in that the surface structuring is formed by an adhesive coating thinly sprayed onto the inner surface of the drum, the coating of which faces the screw Surface is rough.
Mit einer solchen Haftschicht gelingt es in überraschender Weise, den Feststoff weitestgehend in axialer Richtung und damit auf kürzestem Wege zum Feststoffaustrag zu befördern, so daß bereits aus diesem Grunde der Antriebsleistungsbedarf zu verringern und die Trommelinnenfläche vor Verschleiß zu schützen. Die Rauhigkeit der der Schnecke zugewandten Oberfläche der Haftschicht hält zwischen sich und der radial äußeren Schneckenwendelbegrenzung eine Sedimentschicht fest, die ebenfalls verschleißschützend wirkt. Der besondere Vorteil dieser Aufbereitung der Trommelinnenfläche gegen Umfangsbewegungen des Feststoffes besteht darin, daß lediglich das Aufspritzen einer dünnen und flächendeckenden Haftschicht als Herstellungsprozess erforderlich ist. Ein solches Aufspritzen vermeidet eine spanende oder pressende Bearbeitung des Trommelmantels und ist selbst problemlos und in der erforderlichen Gleichmäßigkeit durchzuführen. Die Haftschicht bedarf keiner wie auch immer gearteten unmittelbaren Behandlung der Trommelinnenfläche, um an dieser rutschsicher mit der erforderlichen Festigkeit gehalten zu werden.With such an adhesive layer, it is surprisingly possible to convey the solid as much as possible in the axial direction and thus by the shortest route to the solid discharge, so that for this reason alone the drive power requirement is reduced and the inner surface of the drum is protected from wear. The roughness of the surface of the adhesive layer facing the screw holds a sediment layer between itself and the radially outer screw helix boundary, which also acts to protect against wear. The particular advantage of this preparation of the inner surface of the drum against circumferential movements of the solid material is that only a thin, surface-covering adhesive layer is required as a manufacturing process. Such spraying avoids machining or pressing processing of the drum shell and can be carried out without problems and with the required uniformity. The adhesive layer does not require any kind of direct treatment of the inner surface of the drum in order to be held there with the required strength in a non-slip manner.
In bevorzugter Ausführung erstreckt sich die Haftbeschichtung über die Trommelinnenfläche vollumfänglich herum, und zwar flächendeckend, also ohne Unterbrechung. In weiterer bevorzugter Ausführung kann die Haftbeschichtung aber auch auf Teilbereiche beschränkt sein, also nur teilflächendeckend ausgebildet. Dabei kann man so vorgehen, daß man die Haftbeschichtung in Form von in Trommelumfangsrichtung beabstandeten Streifen gestaltet, die ihrerseits verschiedenen Verlauf haben können, so in bevorzugter Ausführung jeweils parallel zur Rotationsachse der Trommel verlaufend oder aber leicht geneigt dazu der Transportrichtung des Feststoffes hin zum Feststoffaustrag folgend Die streifenförmige Haftbeschichtung kann sich aber auch schrauben- oder wendelförmig erstrecken, und zwar unter jeder möglichen Steigungen mit Ausnahme der Schneckenwendelsteigung. Der Streifenverlauf kann also gleichsinnig wie der Schneckenwendelverlauf gerichtet sein, rechts- oder linksgängig in Anpassung an die jeweils verwendete Schnecke oder aber auch derart, daß die schrauben- oder wendelförmige Streifenausbildung der Haftbeschichtung dem Steigungssinn der Wendel der verwendeten Schnecke entgegengerichtet ist.In a preferred embodiment, the adhesive coating extends over the entire circumference of the drum, covering the entire surface, that is to say without interruption. In a further preferred embodiment, the adhesive coating can also be restricted to partial areas, that is to say it is only designed to cover part of the area. One can proceed in such a way that the adhesive coating is designed in the form of strips spaced apart in the circumferential direction of the drum, which in turn can have different courses, in a preferred embodiment running parallel to the axis of rotation of the drum or slightly inclined to the direction of transport of the solid towards the solid discharge The strip-like adhesive coating can, however, also extend in the form of a screw or helix, namely under any possible incline with the exception of the helical pitch. The streak can So be directed in the same direction as the helix course, right-handed or left-handed in adaptation to the snail used in each case, or also in such a way that the helical or helical stripe formation of the adhesive coating opposes the sense of pitch of the helix of the snail used.
Desweiteren ist es möglich, die Haftschicht auf bestimmte Bereiche derart zu beschränken, daß sich eine gewisse Fleckenstruktur ergibt. Diese muß nicht regelmäßig sein. Desweiteren ist es denkbar, eine Art Kreuzmusterstruktur vorzusehen, in einfachster Weise also derart, daß streifenförmige Haftbeschichtungsbereiche einander kreuzend angeordnet sind.Furthermore, it is possible to limit the adhesive layer to certain areas in such a way that a certain stain structure results. This does not have to be regular. Furthermore, it is conceivable to provide a type of cross pattern structure, in the simplest way, in such a way that strip-shaped adhesive coating areas are arranged crossing one another.
Schließlich ist in bevorzugter Ausführung die Haftbeschichtung bis zum Feststoffaustrag hin geführt, was grundsätzlich für jedes gewählte Beschichtungsmuster gilt.Finally, in a preferred embodiment, the adhesive coating is carried out until the solids are discharged, which basically applies to each selected coating pattern.
Die Haftschicht selbst kann verhältnismäßig dünn sein, so insbesondere weniger als 0,5 mm in radialer Richtung gesehen.The adhesive layer itself can be relatively thin, in particular less than 0.5 mm in the radial direction.
Die Haftschicht kann unter Verwendung von Kunststoff, Keramik, Wolframkarbid, natürlichen und/oder synthetischen körnigen Materialien bestehen, es können Mischungen dieser Stoffe vorgesehen sein, insbesondere wird man körnige Materialien in Bindematerialien einsetzen, wie dies von Schleifwerkzeugen, insbesondere Schleifscheiben, an sich bekannt ist. Es ist lediglich erforderlich, daß diese Stoffe bzw. Mischungen spritzfähig sind, um aufgebracht zu werden. Ein nachfolgendes Härten kann zeit- und/oder temperaturabhängig erfolgen. Die rauhe Oberfläche zum Trennraum hin gesehen ergibt sich durch das Aufspritzen der Haftschicht von selbst, diese bedarf also nach dem Aufspritzen insoweit keiner Nachbehandlung.The adhesive layer can consist of plastic, ceramic, tungsten carbide, natural and / or synthetic granular materials, mixtures of these substances can be provided, in particular granular materials will be used in binding materials, as is known per se from grinding tools, in particular grinding wheels . It is only necessary that these substances or mixtures are sprayable in order to be applied. Subsequent hardening can take place depending on time and / or temperature. The rough surface towards the separation area results from the spraying on of the adhesive layer of its own accord, so this does not require any post-treatment after the spraying.
Bevorzugte Ausführungen der Erfindung ergeben sich aus den Unteransprüchen.Preferred embodiments of the invention result from the subclaims.
Die Erfindung wird anhand der in der Zeichnung wiedergegebenen Ausführungsbeispiele nachstehend näher erläutert. Es zeigen:
Figur 1- eine Vollmantelschneckenzentrifuge in einer skizzenhaften Längsschnittdarstellung;
Figuren 2 bis 4- verschiedene Ausführungsformen von Haftbeschichtungen in unterschiedlicher Streifenform anhand von Teilbereichen der Trommelinnenfläche und des an diese angrenzenden Schneckenwendel-Peripheriebereiches in Abwicklung auf eine Ebene.
- Figure 1
- a solid bowl screw centrifuge in a sketchy longitudinal section;
- Figures 2 to 4
- Different embodiments of adhesive coatings in different strip shapes based on partial areas of the inner drum surface and the peripheral helix peripheral area adjacent to it, developed on one level.
Die aus der Zeichnung ersichtliche Vollmantel-Schneckenzentrifuge weist in grundsätzlich üblicher Bauart eine Trommel 1 und eine koaxial zu dieser angeordnete und zur Trommel mit Differenzdrehzahl umlaufende Schnecke 2 auf, deren radial äußeren peripheren Wendelbereiche bis in die Nähe der Trommelinnenfläche reichen, so daß durch das Zulaufrohr 4 in den zwischen Trommel 1 und Schnecke 2 gebildeten Trennraum 3 in Richtung der Pfeile eingegebene Suspension bei Drehung der Trommel mit hoher Schleuderdrehzahl unter Fliehkrafteinfluß sich in eine Flüssigphase und eine Feststoffphase trennt. Die Flüssigkeit fließt über ein Wehr bei 6 an der einen axialen Stirnseite der Trommel ab, während der Feststoff, der sich unter Fliehkrafteinfluß an der Trommelinnenfläche absetzt, von der Wendel der Schnecke 2 zum Feststoffaustrag 5 am anderen axialen Ende der Trommel gefördert wird, und zwar derart, daß der Feststoff an der Schneckenwendel und der Trommelinnenmantelwandung schleifend angreift. Um den Weg des Feststoffes klein zu halten, also möglichst ohne Umfangskomponente geradlinig in Achsrichtung der Trommel, ist die Trommelinnenfläche mit einer Haftbeschichtung 7 versehen, die dünn ausgebildet und flächendeckend auf die Trommelinnenfläche aufgespritzt ist. Die Haftschicht, die aus in einer Kunststoffbindung gehaltenem körnigem hartem Material bestehen kann und eine der Schnecke zugewandt rauhe Oberfläche aufweist, setzt der Umfangsbewegung des Feststoffes einen entsprechend hohen Reibwiderstand entgegen, so daß die glatt ausgebildete Schneckenwendel den Feststoff hauptsächlich in axialer Richtung fördert. Dadurch wird die Antriebsleistung und der Verschleiß der Zentrifugenteile gering gehalten.The solid-bowl screw centrifuge shown in the drawing has a
Die in Figur 1 anhand des dortigen Schnittbildes ersichtliche Trommelinnenteilfläche zeigt, daß die Haftbeschichtung 7 sich über die gesamte Trommelinnenfläche in Umfangsrichtung und bis zum Feststoffaustrag durchgehend flächendeckend erstreckt. In Figur 2 ist die Haftbeschichtung 7' auf eine Anzahl - beispielsweise sechs Stück jeweils ca. 50 mm breit - unterteilt, d.h. die Haftbeschichtungsmasse wird nur in dieser Streifenform auf die Trommelinnenfläche in entsprechenden Abständen und ansonsten rotationssymetrisch verteilt aufgespritzt. Die Streifen 7' erstrecken sich dabei parallel zur Trommellängsachse; in etwas geänderter Ausführung können sie leicht geneigt zu dieser Achsrichtung sein, und zwar in Anpassung an den tatsächlichen Weg, den der von den Wendeln zum Feststoffaustrag hin geförderte Feststoff nimmt.The inside of the drum, which can be seen in FIG. 1 on the basis of the sectional view there, shows that the
Figur 3 zeigt eine Haftbeschichtung 7'' der Trommelinnenfläche, die aus einem wendelförmig verlaufenden Streifen geformt ist. Von solchen Wendeln können mehrere in Achsrichtung ineinander geschachtelt vorgesehen sein. Der streifenförmige Wendel nach Figur 3 verläuft hinsichtlich seiner Steigung in der gleichen Umlaufrichtung wie die Schneckenwendel, jedoch mit einer Steigung, die von derjenigen der Schneckenwendel abweicht, so daß eine Überstreichbewegung der äußeren Peripherie der Schneckenwendel gegenüber der streifenförmigen Beschichtung gegeben ist. Die Größenordnung ist dabei in weiten Grenzen wählbar.FIG. 3 shows an
Figur 4 zeigt eine Haftbeschichtung 7''' in Form eines wendelförmigen Streifens, der in seiner Umlaufrichtung zu derjenigen der Schneckenwendel konträr verläuft, so daß ein Überstreichen der Schneckenwendel gegenüber dem spiraligen Streifen zwangsläufig gegeben ist. Auch hier können natürlich mehrere Wendelgänge streifenförmiger Haftbeschichtungen ähnlich einer mehrgängigen Schnecke ineinander geschachtelt vorgesehen sein.FIG. 4 shows an
Claims (17)
dadurch gekennzeichnet,
daß die Oberflächenstrukturierung durch eine auf die Trommelinnenfläche dünn aufgespritzte Haftbeschichtung (7; 7'; 7''; 7''') gebildet ist, deren der Schnecke (2) zugewandte Oberfläche rauh ist.Solid-bowl screw centrifuge for separating suspension into at least one liquid phase and solid which settles under centrifugal force on the inside of the drum facing the screw and from the screw rotating at a relatively low speed of rotation to the drum along the inside of the drum to the one in the one, in particular conically narrowing The solid discharge located in the axial end region of the drum is conveyed, the inner surface of the drum being provided with a structuring which hinders movement of the solid in the drum circumferential direction.
characterized,
that the surface structuring is formed by an adhesive coating (7; 7 ';7'';7''') thinly sprayed onto the inner surface of the drum, the surface of which facing the screw (2) is rough.
dadurch gekennzeichnet,
daß die Haftbeschichtung (7) auf die Trommelinnenfläche in Umfangsrichtung durchgehend flächendeckend aufgebracht ist.Centrifuge according to claim 1,
characterized,
that the adhesive coating (7) is applied to the drum inner surface in the circumferential direction throughout.
dadurch gekennzeichnet,
daß die Haftbeschichtung (7'; 7''; 7''') auf die Trommelinnenfläche in unterbrochenen Teilbereichen aufgebracht ist.Centrifuge according to claim 1,
characterized,
that the adhesive coating (7 ';7'';7''') on the inner surface of the drum interrupted sections is applied.
dadurch gekennzeichnet,
daß die Haftbeschichtung (7'; 7''; 7''') die Form in Trommelumfangsrichtung beabstandeter Streifen aufweist.Centrifuge according to claim 3,
characterized,
that the adhesive coating (7 ';7'';7''') has the shape of strips spaced in the circumferential direction of the drum.
dadurch gekennzeichnet,
daß die Streifen (7') parallel zur Rotationsachse der Trommel (1) verlaufend angeordnet sind.Centrifuge according to claim 4,
characterized,
that the strips (7 ') are arranged parallel to the axis of rotation of the drum (1).
dadurch gekennzeichnet,
daß die Streifen (7'') in Längsachsrichtung der Trommel (1) schraubenförmig um deren Rotationsachse herum gleichsinnig zum Wendelverlauf der Schnecke (2) aber in der Steigung abweichend verlaufend angeordnet sind.Centrifuge according to claim 4,
characterized,
that the strips (7 '') in the longitudinal axis direction of the drum (1) are arranged helically around their axis of rotation in the same direction as the helical course of the screw (2) but with a different gradient.
dadurch gekennzeichnet,
daß die Streifen (7''') in Längsrichtung der Trommel (1) schraubenförmig um deren Rotationsachse herum gegensinnig zum Wendelverlauf der Schnecke (2) verlaufend angeordnet sind.Centrifuge according to claim 4,
characterized,
that the strips (7 ''') are arranged in the longitudinal direction of the drum (1) helically around its axis of rotation in the opposite direction to the spiral course of the screw (2).
dadurch gekennzeichnet,
daß die Streifen parallel zur Transportrichtung des Feststoffes, also mit einer Winkelneigung zur Trommellängsachse, angeordnet sind.Centrifuge according to claim 4,
characterized,
that the strips are arranged parallel to the direction of transport of the solid, that is, at an angle to the longitudinal axis of the drum.
dadurch gekennzeichnet,
daß die Haftbeschichtung eine Fleckenstruktur oder eine Kreuzmusterstruktur aufweist.Centrifuge according to claim 3,
characterized,
that the adhesive coating has a stain structure or a cross pattern structure.
dadurch gekennzeichnet,
daß die Haftbeschichtung (7; 7'; 7''; 7''') bis zum Feststoffaustrag (5) reichend angeordnet ist.Centrifuge according to one of claims 1 to 9,
characterized,
that the adhesive coating (7; 7 ';7'';7''') is arranged to reach the solid discharge (5).
dadurch gekennzeichnet,
daß die Haftbeschichtung (7; 7'; 7''; 7''') einen Kunststoff aufweist.Centrifuge according to one of claims 1 to 10,
characterized,
that the adhesive coating (7; 7 ';7'';7''') has a plastic.
dadurch gekennzeichnet,
daß die Haftbeschichtung (7; 7'; 7''; 7''') ein Keramikmaterial aufweist.Centrifuge according to one of claims 1 to 11,
characterized,
that the adhesive coating (7; 7 ';7'';7''') has a ceramic material.
dadurch gekennzeichnet,
daß die Haftbeschichtung (7; 7'; 7''; 7''') Wolframkarbid aufweist.Centrifuge according to one of claims 1 to 12,
characterized,
that the adhesive coating (7; 7 ';7'';7''') has tungsten carbide.
dadurch gekennzeichnet,
daß die Haftbeschichtung (7; 7'; 7''; 7''') natürliche und/oder synthetische körnige Materialien, wie Korund, Siliziumkarbid oder dergleichen, aufweist.Centrifuge according to one of claims 1 to 13,
characterized,
that the adhesive coating (7; 7 ';7'';7''') has natural and / or synthetic granular materials such as corundum, silicon carbide or the like.
dadurch gekennzeichnet,
daß die Haftbeschichtung (7; 7'; 7''; 7''') keramische, mineralische, organische oder metallische Bindemittel aufweist.Centrifuge according to one of claims 1 to 14,
characterized,
that the adhesive coating (7; 7 ';7'';7''') has ceramic, mineral, organic or metallic binders.
dadurch gekennzeichnet,
daß die Haftbeschichtung (7; 7'; 7''; 7''') synthetische Bindemittel, wie Phenolformaldehyd-Kondensat, Alkylharze oder dergleichen, aufweist.Centrifuge according to one of claims 1 to 14,
characterized,
that the adhesive coating (7; 7 ';7'';7''') has synthetic binders such as phenol formaldehyde condensate, alkyl resins or the like.
dadurch gekennzeichnet,
daß die Haftbeschichtung (7; 7'; 7''; 7''') dünner als 0,5 mm ist.Centrifuge according to one of claims 1 to 16,
characterized,
that the adhesive coating (7; 7 ';7'';7''') is thinner than 0.5 mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4138855 | 1991-11-26 | ||
| DE4138855 | 1991-11-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0544263A1 true EP0544263A1 (en) | 1993-06-02 |
| EP0544263B1 EP0544263B1 (en) | 1999-04-07 |
Family
ID=6445616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92120108A Expired - Lifetime EP0544263B1 (en) | 1991-11-26 | 1992-11-25 | Solid bowl screw centrifuge with a structured inner bowl surface |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5372260A (en) |
| EP (1) | EP0544263B1 (en) |
| JP (1) | JPH05237416A (en) |
| DE (2) | DE59209674D1 (en) |
| DK (1) | DK0544263T3 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD790298S1 (en) * | 2015-11-18 | 2017-06-27 | Carole Andrews | Stapler for irrigation pipe and landscape fabric |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1117498B (en) * | 1958-12-24 | 1961-11-16 | Cham Ag Maschf | Screw centrifuge |
| US3096282A (en) * | 1957-12-30 | 1963-07-02 | Sharples Corp | Improvement in centrifuges |
| DE2746877A1 (en) * | 1977-10-19 | 1979-04-26 | Messerschmitt Boelkow Blohm | Centrifuge bowl with compacted powder lining - which is resistant to stress and provides thermal insulation |
| WO1981002853A1 (en) * | 1980-03-31 | 1981-10-15 | Pennwalt Corp | Hard surfacing for a centrifuge conveyor |
| EP0076476A2 (en) * | 1981-10-02 | 1983-04-13 | Werner Dr. Stahl | Decanter centrifuge |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2101572A (en) * | 1934-12-20 | 1937-12-07 | Broatch John | Mineral separator |
| US2806599A (en) * | 1954-07-26 | 1957-09-17 | Irene Cottrell | Vacuum control for gravity separators |
| US3092582A (en) * | 1959-03-20 | 1963-06-04 | Black Clawson Co | Centrifuge |
| NL272134A (en) * | 1961-01-11 | |||
| IT954381B (en) * | 1972-03-18 | 1973-08-30 | E Fonderie A Bosco Spa Off Mec | BASKET FOR SUGAR CENTRIFUGE |
| DE3503896A1 (en) * | 1985-02-06 | 1986-08-07 | Draiswerke Gmbh, 6800 Mannheim | LINING FOR A CONTAINER OF A MIXER |
-
1992
- 1992-11-25 JP JP4315025A patent/JPH05237416A/en active Pending
- 1992-11-25 EP EP92120108A patent/EP0544263B1/en not_active Expired - Lifetime
- 1992-11-25 DE DE59209674T patent/DE59209674D1/en not_active Expired - Fee Related
- 1992-11-25 DK DK92120108T patent/DK0544263T3/en active
- 1992-11-26 DE DE4239790A patent/DE4239790C2/en not_active Expired - Fee Related
- 1992-11-27 US US07/983,081 patent/US5372260A/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3096282A (en) * | 1957-12-30 | 1963-07-02 | Sharples Corp | Improvement in centrifuges |
| DE1117498B (en) * | 1958-12-24 | 1961-11-16 | Cham Ag Maschf | Screw centrifuge |
| DE2746877A1 (en) * | 1977-10-19 | 1979-04-26 | Messerschmitt Boelkow Blohm | Centrifuge bowl with compacted powder lining - which is resistant to stress and provides thermal insulation |
| WO1981002853A1 (en) * | 1980-03-31 | 1981-10-15 | Pennwalt Corp | Hard surfacing for a centrifuge conveyor |
| EP0076476A2 (en) * | 1981-10-02 | 1983-04-13 | Werner Dr. Stahl | Decanter centrifuge |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59209674D1 (en) | 1999-05-12 |
| DE4239790A1 (en) | 1993-06-03 |
| EP0544263B1 (en) | 1999-04-07 |
| DK0544263T3 (en) | 2000-07-03 |
| JPH05237416A (en) | 1993-09-17 |
| US5372260A (en) | 1994-12-13 |
| DE4239790C2 (en) | 1998-09-03 |
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