EP3302952B1 - Screw press - Google Patents

Screw press Download PDF

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Publication number
EP3302952B1
EP3302952B1 EP16715500.1A EP16715500A EP3302952B1 EP 3302952 B1 EP3302952 B1 EP 3302952B1 EP 16715500 A EP16715500 A EP 16715500A EP 3302952 B1 EP3302952 B1 EP 3302952B1
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EP
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Prior art keywords
screw
apertures
press according
screw press
helix
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EP16715500.1A
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German (de)
French (fr)
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EP3302952A1 (en
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Torbjorn HAUGER
Terje BREINES
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Voith Patent GmbH
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Voith Patent GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/121—Screw constructions

Definitions

  • the invention relates to a screw press for separating liquids from a suspension, in particular a sludge or pulp suspension with a conical or cylindrical and perforated jacket mounted in a housing and at least one cylindrical or conical screw shaft rotating in the jacket with at least one screw helix, whereby the suspension is pressed from an inlet to an outlet opening through an annular gap formed between the jacket and the screw shaft.
  • dewatering devices have been known for a long time and are used with success in particular for thickening fiber suspensions in machines for producing a fiber web.
  • a driven screw conveyor is arranged within an essentially concentrically cylindrical or conical, perforated sheet metal jacket or the like.
  • the radially added suspension is dewatered in cooperation with a damming device, the water being able to escape through the perforated sheet metal jacket or the like, while the rejects are retained.
  • the compression and drainage of the reject is improved if a conical shape is chosen for the sheet metal jacket, the diameter of which decreases in the reject running direction, whereby the outer screw diameter can of course also be adapted to these geometrical relationships.
  • the known drainage screws are designed as described, they are exposed to particularly high levels of wear as a result of the intense friction between the reject and the components of the machine. There is a considerable relative movement with enormous axial and radial forces at the same time between the already heavily thickened material and the components.
  • the perforation of the jacket can become clogged relatively easily, especially in the inlet area, which greatly impairs drainage. Therefore, an even distribution of the suspension is important there to ensure effective pre-drainage.
  • the object of the invention is therefore to improve the efficiency of the drainage with the least possible wear.
  • At least one worm screw has at least one axially extending opening. Differences in pressure in the suspension can be balanced out axially along the screw shaft via the openings, so that the screw press is evenly loaded at the inlet.
  • At least one worm helix has several axial openings.
  • each turn of the screw spiral has at least one, preferably several, axial openings.
  • At least one, preferably several, in particular all axial openings should have a circular or an elongated, preferably oval cross-section. This enables a large open area of the screw spiral with sufficient stability.
  • the worm helix is designed as a double helix. This means that the worm shaft carries two worm helixes running around one another.
  • At least one, preferably several, in particular all of the axial openings can be designed as recesses that are radially outwardly open. This leads to a loosening of the material in the sieve area and thus increases the dewatering performance.
  • the perforation in the area of the inlet opening often tends to become blocked at high pressures at the inlet.
  • the axial openings are therefore predominantly, preferably exclusively, arranged in the half of the worm shaft facing the inlet opening.
  • the risk of backflows against the conveying direction increases.
  • the openings should also only be present in an axially relatively limited area, which is preferably outside the area of the inlet opening, in particular begins immediately after the inlet opening in the conveying direction.
  • the axial openings are only present in an area which extends axially over a maximum of 1/3, in particular a maximum of 1 ⁇ 4 of the worm shaft and / or which extends axially over a maximum of 1.2 m, in particular a maximum of 1 m of the worm shaft (3) extends and / or the screw spiral has a maximum of 8, preferably a maximum of 5 openings.
  • a backflow counter to the conveying direction is effectively countered in that the cross-sectional area of the openings in the conveying direction tends to decrease, preferably from opening to opening.
  • At least some of the, preferably all, openings should extend to the worm shaft.
  • the distance between two adjacent, axial openings is approximately the same in the circumferential direction.
  • the screw press shown is used for dewatering a pulp suspension formed at least partially from waste paper, as is required for the production of a fibrous web.
  • the screw press has a screw shaft 3 arranged concentrically and rotatably mounted in a cylindrical shell 2, the suspension from the screw spirals 4 of the screw shaft 3 through an annular gap 5 formed between the shell 2 and the screw shaft 3 from at least one inlet 7 to one Outlet opening 8 is pressed.
  • the suspension As it passes through the annular gap 5, the suspension is dewatered both by gravity and by compression taking place during transport.
  • the water runs through the sieve openings of the jacket 2 into a drainage box with an outlet 9.
  • This drainage box collects the collected water and is integrated here, for example, into the housing 1 surrounding the jacket 2.
  • the screw shaft 3 and / or the jacket 2 can be designed and arranged conically in such a way that the annular gap 5 gradually decreases in size in the conveying direction 10.
  • the thickened suspension After passing through the annular gap 5, the thickened suspension reaches the area of the outlet opening 8.
  • the worm shaft 3 is driven by a motor 11, it being possible for a gear, a belt or the like to be connected in between.
  • the construction is particularly simple if, as shown here, the cylinder axis 12 of the jacket 2 runs horizontally.
  • the perforation of the jacket 2 can become clogged, which significantly impairs the drainage performance.
  • the worm helix 4 therefore has a plurality of axially extending openings 6.
  • openings 6 allow axial pressure equalization within the Suspension and thus counteract local overloads.
  • these axial openings 6 are oval with a longitudinal extension in the circumferential direction of the helical screw 4 formed, which reduces the loading capacity of the helical screw 4 only relatively slightly and yet allows a large open area for the helical screw 4.
  • the axial and here circular openings 6 are at Figure 1 also arranged only in the half of the screw shaft 3 facing the inlet opening 7.
  • the area with the openings 6 directly adjoins the inlet opening 7 in the conveying direction 10 and extends over a relatively short, axial section of the screw shaft 3, which is shorter than 1 ⁇ 4 of the total length of the screw shaft 3, in particular shorter than 1 m.
  • the screw helix 4 is designed as a double helix in this example. Of the two coils of the screw coil 4 that run around one another, only one coil has axial openings 6.
  • the cross-sectional area of the openings 6 in the conveying direction 10 from opening 6 to opening 6 becomes smaller.
  • the openings 6 extend to the worm shaft 3, which can have a positive effect on the stability of the worm helix 4.
  • the distance between two adjacent, axial openings 6 in the circumferential direction is approximately the same size, whereby it is usually sufficient if the helix 4 has a total of only 5 openings 6.
  • the openings 6 are at Figure 2 35 to 65% of the cross-sectional area of the screw spiral 4 running perpendicular to the screw shaft 3 in relation to the section of the screw spiral 4 having openings 6 is perforated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Sludge (AREA)
  • Paper (AREA)

Description

Die Erfindung betrifft eine Schneckenpresse zum Abtrennen von Flüssigkeiten aus einer Suspension, insbesondere einer Schlamm- oder Faserstoffsuspension mit einem, in einem Gehäuse gelagerten, konischen oder zylindrischen und perforierten Mantel und wenigstens einer im Mantel rotierenden, zylindrischen oder konischen Schneckenwelle mit zumindest einer Schneckenwendel, wobei die Suspension durch einen zwischen dem Mantel und der Schneckenwelle gebildeten Ringspalt von einer Einlass- zu einer Auslassöffnung gepresst wird.The invention relates to a screw press for separating liquids from a suspension, in particular a sludge or pulp suspension with a conical or cylindrical and perforated jacket mounted in a housing and at least one cylindrical or conical screw shaft rotating in the jacket with at least one screw helix, whereby the suspension is pressed from an inlet to an outlet opening through an annular gap formed between the jacket and the screw shaft.

Derartige Entwässerungsvorrichtungen sind seit langer Zeit bekannt und werden mit Erfolg insbesondere bei der Eindickung von Faserstoffsuspensionen in Maschinen zur Herstellung einer Faserstoffbahn verwendet.Such dewatering devices have been known for a long time and are used with success in particular for thickening fiber suspensions in machines for producing a fiber web.

Dabei ist in der Regel eine angetriebene Förderschnecke innerhalb eines im Wesentlichen konzentrisch zylindrischen oder konischen, gelochten Blechmantels oder dergl. angeordnet. Die radial zugegebene Suspension wird im Zusammenwirken mit einer Staueinrichtung entwässert, wobei das Wasser durch den gelochten Blechmantel oder dergl. entweichen kann, während die Rejecte zurückgehalten werden.
Die Verdichtung und Entwässerung des Rejects wird verbessert, wenn für den Blechmantel eine konische Form gewählt wird, deren Durchmesser sich in Rejectlaufrichtung verkleinert, wobei selbstverständlich auch der äußere Schneckendurchmesser an diese geometrischen Verhältnisse angepasst werden kann.
Werden die bekannten Entwässerungsschnecken wie beschrieben ausgeführt, so sind sie infolge der intensiven Reibung zwischen Reject und den Bauteilen der Maschine einem besonders großen Verschleiß ausgesetzt. Es findet nämlich eine beträchtliche Relativbewegung bei gleichzeitig enormen Axial- und Radialkräften zwischen dem bereits stark eingedickten Stoff und den Bauteilen statt.As a rule, a driven screw conveyor is arranged within an essentially concentrically cylindrical or conical, perforated sheet metal jacket or the like. The radially added suspension is dewatered in cooperation with a damming device, the water being able to escape through the perforated sheet metal jacket or the like, while the rejects are retained.
The compression and drainage of the reject is improved if a conical shape is chosen for the sheet metal jacket, the diameter of which decreases in the reject running direction, whereby the outer screw diameter can of course also be adapted to these geometrical relationships.
If the known drainage screws are designed as described, they are exposed to particularly high levels of wear as a result of the intense friction between the reject and the components of the machine. There is a considerable relative movement with enormous axial and radial forces at the same time between the already heavily thickened material and the components.

Zudem kann die Perforation des Mantels vor allem im Einlaufbereich relativ leicht verstopfen, was die Entwässerung sehr beeinträchtigt. Daher ist dort eine gleichmäßige Verteilung der Suspension zur Gewährleistung einer effektiven Vorentwässerung wichtig.In addition, the perforation of the jacket can become clogged relatively easily, especially in the inlet area, which greatly impairs drainage. Therefore, an even distribution of the suspension is important there to ensure effective pre-drainage.

Dokument EP 1 990 181 A2 offenbart eine Schneckenpresse gemäss dem Oberbegriff des Anspruchs 1.document EP 1 990 181 A2 discloses a screw press according to the preamble of claim 1.

Die Aufgabe der Erfindung ist es daher die Effizienz der Entwässerung bei möglichst geringem Verschleiß zu verbessern.The object of the invention is therefore to improve the efficiency of the drainage with the least possible wear.

Erfindungsgemäß wurde die Aufgabe durch eine Schneckenpresse mit den Merkmalen des Anspruchs 1 gelöst.According to the invention, the object was achieved by a screw press with the features of claim 1.

Gemäss der Erfindung besitzt wenigstens eine Schneckenwendel zumindest einen axial verlaufenden Durchbruch. Über die Durchbrüche können sich Druckunterschiede in der Suspension axial entlang der Schneckenwelle ausgleichen, wodurch die Schneckenpresse am Einlauf gleichmäßig beaufschlagt wird.According to the invention, at least one worm screw has at least one axially extending opening. Differences in pressure in the suspension can be balanced out axially along the screw shaft via the openings, so that the screw press is evenly loaded at the inlet.

Um dies umfassend zu nutzen, weist wenigstens eine Schneckenwendel mehrere axiale Durchbrüche auf. Besonders vorteilhaft ist es jedoch, wenn jede Windung der Schneckenwendel mindestens einen, vorzugsweise mehrere axiale Durchbrüche besitzt.In order to make full use of this, at least one worm helix has several axial openings. However, it is particularly advantageous if each turn of the screw spiral has at least one, preferably several, axial openings.

Im Interesse einer einfachen Herstellbarkeit der axialen Durchbrüche sowie einer möglichst stabilen Schneckenwendel sollte zumindest ein, vorzugsweise mehrere, insbesondere alle axialen Durchbrüche einen kreisrunden oder einen länglichen, vorzugsweise ovalen Querschnitt aufweisen. Dies ermöglicht eine große offene Fläche der Schneckenwendel bei dennoch ausreichender Stabilität.In the interest of simple production of the axial openings and the most stable possible screw helix, at least one, preferably several, in particular all axial openings should have a circular or an elongated, preferably oval cross-section. This enables a large open area of the screw spiral with sufficient stability.

Hinsichtlich der Anordnung und Ausgestaltung von axialen Durchbrüchen ergeben sich vielfältige Möglichkeiten, wenn die Schneckenwendel als Doppelwendel ausgebildet ist. Dies bedeutet, dass die Schneckenwelle zwei umeinanderlaufende Schneckenwendel trägt.With regard to the arrangement and configuration of axial openings, there are many possibilities if the worm helix is designed as a double helix. This means that the worm shaft carries two worm helixes running around one another.

So kann es beispielsweise hierbei vorteilhaft sein, dass nur eine Schneckenwendel axiale Durchbrüche oder aber beide Schneckenwendel unterschiedlich gestaltete axiale Durchbrüche besitzen.For example, it can be advantageous here that only one worm helix has axial openings or that both worm helixes have differently designed axial openings.

Sollte nur abschnittsweise eine Doppelwendel vorhanden sein, so ist es von Vorteil, wenn die Durchbrüche nicht im Bereich der Doppelwendel liegen.If a double helix is only present in sections, it is advantageous if the openings are not in the area of the double helix.

Vor allem bei Schneckenwellen mit Doppelwendel können zumindest ein, vorzugsweise mehrere, insbesondere alle axialen Durchbrüche als radial nach außen offene Aussparungen ausgebildet sein. Dies führt zu einer Auflockerung des Stoffs im Siebbereich und erhöht so die Entwässerungsleistung.Particularly in the case of worm shafts with a double helix, at least one, preferably several, in particular all of the axial openings can be designed as recesses that are radially outwardly open. This leads to a loosening of the material in the sieve area and thus increases the dewatering performance.

Unabhängig von der Art der Durchbrüche hat es sich als optimal erwiesen, wenn 25 bis 75 %, insbesondere 35 bis 65% der senkrecht zur Schneckenwelle verlaufenden Querschnittsfläche des Durchbrüche aufweisenden Bereichs der Schneckenwendel durchbrochen sind.Regardless of the type of openings, it has proven to be optimal if 25 to 75%, in particular 35 to 65%, of the cross-sectional area of the area of the screw helix that has openings and that runs perpendicular to the screw shaft are perforated.

Des Weiteren wurde erkannt, dass häufig die Perforation im Bereich der Einlassöffnung bei hohen Drücken am Einlass zur Verstopfung neigt. Daher werden die axialen Durchbrüche vorwiegend, vorzugsweise ausschließlich in der zur Einlassöffnung weisenden Hälfte der Schneckenwelle angeordnet. Darüber hinaus steigt mit zunehmender Entfernung von der Einlassöffnung und damit auch zunehmender Verdichtung die Gefahr von Rückströmungen entgegen der Förderrichtung.Furthermore, it was recognized that the perforation in the area of the inlet opening often tends to become blocked at high pressures at the inlet. The axial openings are therefore predominantly, preferably exclusively, arranged in the half of the worm shaft facing the inlet opening. In addition, with increasing distance from the inlet opening and thus also increasing compression, the risk of backflows against the conveying direction increases.

Aus diesem Grund sollten die Durchbrüche auch nur in einem axial relativ begrenzten Bereich vorhanden sein, der vorzugsweise außerhalb des Bereichs der Einlassöffnung liegt, insbesondere in Förderrichtung unmittelbar nach der Einlassöffnung beginnt.For this reason, the openings should also only be present in an axially relatively limited area, which is preferably outside the area of the inlet opening, in particular begins immediately after the inlet opening in the conveying direction.

Je nach Größe, Konstruktion und Einsatz kann es daher vorteilhaft sein, wenn die axialen Durchbrüche nur in einem Bereich vorhanden sind, der sich axial maximal über 1/3, insbesondere höchstens ¼ der Schneckenwelle erstreckt und/oder der sich axial maximal über 1,2 m, insbesondere höchstens 1 m der Schneckenwelle (3) erstreckt und/oder die Schneckenwendel maximal 8, vorzugsweise maximal 5 Durchbrüche besitzt.Depending on the size, construction and use, it can therefore be advantageous if the axial openings are only present in an area which extends axially over a maximum of 1/3, in particular a maximum of ¼ of the worm shaft and / or which extends axially over a maximum of 1.2 m, in particular a maximum of 1 m of the worm shaft (3) extends and / or the screw spiral has a maximum of 8, preferably a maximum of 5 openings.

Unabhängig davon in welchem Abschnitt der Schneckenwendel Durchbrüche vorhanden sind, wird einer Rückströmung entgegen der Förderrichtung wirksam dadurch begegnet, dass die Querschnittsfläche der Durchbrüche in Förderrichtung tendenziell, vorzugsweise von Durchbruch zu Durchbruch abnimmt.Regardless of the section of the screw spiral in which openings are present, a backflow counter to the conveying direction is effectively countered in that the cross-sectional area of the openings in the conveying direction tends to decrease, preferably from opening to opening.

Im Interesse einer hohen Stabilität bei möglichst großer offener Fläche sollte zumindest ein Teil der, vorzugsweise alle Durchbrüche bis zur Schneckenwelle reichen.In the interests of high stability with the largest possible open area, at least some of the, preferably all, openings should extend to the worm shaft.

Außerdem kann es ebenso von Vorteil sein, wenn der Abstand jeweils zwischen zwei benachbarten, axialen Durchbrüchen in Umfangsrichtung etwa gleichgroß ist.In addition, it can also be advantageous if the distance between two adjacent, axial openings is approximately the same in the circumferential direction.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt:

  • Figur 1: einen schematischen Längsschnitt durch eine Schneckenpresse und
  • Figur 2 bis 4: einen Teilquerschnitt einer Schneckenwelle 3 mit unterschiedlich gestalteten Schneckenwendeln 4.
The invention will be explained in more detail below using an exemplary embodiment. In the attached drawing shows:
  • Figure 1 : a schematic longitudinal section through a screw press and
  • Figures 2 to 4 : a partial cross-section of a worm shaft 3 with differently designed worm helices 4.

Die in Figur 1 gezeigte Schneckenpresse dient zur Entwässerung einer zumindest teilweise von Altpapier gebildeten Faserstoffsuspension, wie sie zur Herstellung einer Faserstoffbahn benötigt wird.In the Figure 1 The screw press shown is used for dewatering a pulp suspension formed at least partially from waste paper, as is required for the production of a fibrous web.

Hierzu besitzt die Schneckenpresse eine, in einem zylindrischen Mantel 2 konzentrisch angeordnete und rotierbar gelagerte Schneckenwelle 3, wobei die Suspension von den Schneckenwendeln 4 der Schneckenwelle 3 durch einen zwischen dem Mantel 2 und der Schneckenwelle 3 gebildeten Ringspalt 5 von wenigstens einer Einlass 7- zu einer Auslassöffnung 8 gepresst wird.For this purpose, the screw press has a screw shaft 3 arranged concentrically and rotatably mounted in a cylindrical shell 2, the suspension from the screw spirals 4 of the screw shaft 3 through an annular gap 5 formed between the shell 2 and the screw shaft 3 from at least one inlet 7 to one Outlet opening 8 is pressed.

Die Suspension wird beim Durchlaufen des Ringspaltes 5 sowohl durch die Schwerkraft als auch durch eine beim Transport stattfindende Komprimierung entwässert. Dabei läuft das Wasser durch die Sieböffnungen des Mantels 2 in einen Entwässerungskasten mit einem Ablauf 9. Dieser Entwässerungskasten sammelt das aufgefangene Wasser und wird hier beispielhaft in das den Mantel 2 umgebende Gehäuse 1 integriert.As it passes through the annular gap 5, the suspension is dewatered both by gravity and by compression taking place during transport. The water runs through the sieve openings of the jacket 2 into a drainage box with an outlet 9. This drainage box collects the collected water and is integrated here, for example, into the housing 1 surrounding the jacket 2.

Um die Entwässerung zu intensivieren, kann die Schneckenwelle 3 und/oder der Mantel 2 derart konisch ausgebildet und angeordnet sein, dass sich der Ringspalt 5 in Förderrichtung 10 allmählich verkleinert.In order to intensify the dewatering, the screw shaft 3 and / or the jacket 2 can be designed and arranged conically in such a way that the annular gap 5 gradually decreases in size in the conveying direction 10.

Nach dem Durchlaufen des Ringspalts 5 gelangt die eingedickte Suspension in den Bereich der Auslassöffnung 8.After passing through the annular gap 5, the thickened suspension reaches the area of the outlet opening 8.

Die Schneckenwelle 3 wird von einem Motor 11 angetrieben, wobei ein Getriebe, ein Riemen o.ä. dazwischen geschaltet sein kann.The worm shaft 3 is driven by a motor 11, it being possible for a gear, a belt or the like to be connected in between.

Besonders einfach gestaltet sich die Konstruktion, wenn wie hier dargestellt, die Zylinderachse 12 des Mantels 2 horizontal verläuft.The construction is particularly simple if, as shown here, the cylinder axis 12 of the jacket 2 runs horizontally.

Insbesondere bei hohen Drücken im Bereich der Einlassöffnung 7 kann es zum Verstopfen der Perforation des Mantels 2 kommen, was die Entwässerungsleistung wesentlich beeinträchtigt.Particularly at high pressures in the area of the inlet opening 7, the perforation of the jacket 2 can become clogged, which significantly impairs the drainage performance.

Daher besitzen die Schneckenwendel 4 mehrere axial verlaufende Durchbrüche 6.The worm helix 4 therefore has a plurality of axially extending openings 6.

Diese Durchbrüche 6 ermöglichen einen axialen Druckausgleich innerhalb der
Suspension und wirken so lokalen Überlastungen entgegen.These openings 6 allow axial pressure equalization within the
Suspension and thus counteract local overloads.

Im Ergebnis kann über die Betriebszeit eine hohe Entwässerungskapazität bei möglichst geringem Einlaufdruck gewährleistet werden.As a result, a high drainage capacity with the lowest possible inlet pressure can be guaranteed over the operating time.

Gemäß Figur 2 sind diese axialen Durchbrüche 6 oval mit Längserstreckung in Umfangsrichtung der Schneckenwendel 4
ausgebildet, was die Belastbarkeit der Schneckenwendel 4 nur relativ gering vermindert und dennoch eine große offene Fläche bei der Schneckenwendel 4 erlaubt.According to Figure 2 these axial openings 6 are oval with a longitudinal extension in the circumferential direction of the helical screw 4
formed, which reduces the loading capacity of the helical screw 4 only relatively slightly and yet allows a large open area for the helical screw 4.

Da insbesondere im Bereich der Einlassöffnung 7 mit einem Verschluss der Perforation gerechnet wird, sind die axialen und hier kreisrunden Durchbrüche 6 bei Figur 1 auch nur in der zur Einlassöffnung 7 weisenden Hälfte der Schneckenwelle 3 angeordnet.Since a closure of the perforation is expected in the area of the inlet opening 7 in particular, the axial and here circular openings 6 are at Figure 1 also arranged only in the half of the screw shaft 3 facing the inlet opening 7.

Konkret schließt sich der Bereich mit den Durchbrüchen 6 unmittelbar an die Einlassöffnung 7 in Förderrichtung 10 an und erstreckt sich dabei über einen relativ kurzen, axialen Abschnitt der Schneckenwelle 3, der kürzer als ¼ der Gesamtlänge der Schneckenwelle 3, insbesondere kürzer als 1 m ist.Specifically, the area with the openings 6 directly adjoins the inlet opening 7 in the conveying direction 10 and extends over a relatively short, axial section of the screw shaft 3, which is shorter than ¼ of the total length of the screw shaft 3, in particular shorter than 1 m.

Durch die Anordnung der Durchbrüche 6 nahe der Einlassöffnung 7 besteht kaum die Gefahr einer Rückströmung von Suspension infolge starker Verdichtung derselben.Due to the arrangement of the openings 6 near the inlet opening 7, there is hardly any risk of a backflow of suspension as a result of strong compression of the same.

Im Gegensatz hierzu werden die axialen Durchbrüche 6 in Figur 3 von radial nach außen offene Aussparungen gebildet.In contrast, the axial openings 6 in Figure 3 formed by radially outwardly open recesses.

Außerdem ist die Schneckenwendel 4 in diesem Beispiel als Doppelwendel ausgeführt. Von den zwei umeinanderlaufenden Wendeln der Schneckenwendel 4 besitzt nur eine Wendel axiale Durchbrüche 6.In addition, the screw helix 4 is designed as a double helix in this example. Of the two coils of the screw coil 4 that run around one another, only one coil has axial openings 6.

Zwecks Vermeidung einer Rückströmung wird die Querschnittsfläche der Durchbrüche 6 in Förderrichtung 10 von Durchbruch 6 zu Durchbruch 6 kleiner.In order to avoid a backflow, the cross-sectional area of the openings 6 in the conveying direction 10 from opening 6 to opening 6 becomes smaller.

Bei der Ausführung gemäß Figur 4 reichen die Durchbrüche 6 bis zur Schneckenwelle 3 hin, was sich positiv auf die Stabilität der Schneckenwendel 4 auswirken kann.When executing according to Figure 4 the openings 6 extend to the worm shaft 3, which can have a positive effect on the stability of the worm helix 4.

Unabhängig von der Art der Durchbrüche 6 ist der Abstand jeweils zwischen zwei benachbarten, axialen Durchbrüchen 6 in Umfangsrichtung etwa gleichgroß, wobei es meist genügt, wenn die Schneckenwendel 4 insgesamt nur 5 Durchbrüche 6 hat.Regardless of the type of openings 6, the distance between two adjacent, axial openings 6 in the circumferential direction is approximately the same size, whereby it is usually sufficient if the helix 4 has a total of only 5 openings 6.

Im Interesse einer hohen Effizienz der Durchbrüche 6 sind bei Figur 2 35 bis 65 % der senkrecht zur Schneckenwelle 3 verlaufenden Querschnittsfläche der Schneckenwendel 4 bezogen auf den Durchbrüche 6 aufweisenden Abschnitt der Schneckenwendel 4 durchbrochen.In the interests of high efficiency, the openings 6 are at Figure 2 35 to 65% of the cross-sectional area of the screw spiral 4 running perpendicular to the screw shaft 3 in relation to the section of the screw spiral 4 having openings 6 is perforated.

Claims (14)

  1. Screw press for separating liquids from a suspension, in particular a sludge or fibrous material suspension, having a conical or cylindrical and perforated casing (2) supported in a housing (1), and at least one cylindrical or conical screw shaft (3) rotating in the casing (2) and having at least one screw helix (4), wherein the suspension is pressed from an inlet opening (7) to an outlet opening (8) through an annular gap (5) formed between the casing (2) and the screw shaft (3), wherein at least one screw helix (4) has a plurality of apertures (6) running axially, the axial apertures (6) are arranged predominantly in the half of the screw shaft (3) that points towards the inlet opening (7), characterized in that the cross-sectional area of the apertures (6) decreases in the conveying direction (10).
  2. Screw press according to Claim 1, characterized in that each turn of the screw helix (4) has at least one, preferably a plurality of axial apertures (6).
  3. Screw press according to one of the preceding claims, characterized in that at least one, preferably a plurality, in particular all of the axial apertures (6) have a circular or elongated, preferably oval, cross section.
  4. Screw press according to one of the preceding claims, characterized in that the screw helix (4) is not formed as a double helix in the region of the apertures (6) .
  5. Screw press according to one of the preceding claims, characterized in that at least one, preferably a plurality, in particular all of the axial apertures (6) are formed as recesses open radially to the outside.
  6. Screw press according to one of the preceding claims, characterized in that 25 to 75%, in particular 35 to 65% of the cross-sectional area, extending perpendicular to the screw helix (3), of the region of the screw helix (4) that has apertures (6) is perforated.
  7. Screw press according to one of the preceding claims, characterized in that the axial apertures (6) are arranged only in the half of the screw shaft (3) that points towards the inlet opening (7).
  8. Screw press according to one of the preceding claims, characterized in that the axial apertures (6) are present only in a region which extends axially at most over 1/3, in particular at most 1/4 of the screw shaft (3) and preferably begins immediately after the inlet opening in the conveying direction.
  9. Screw press according to one of the preceding claims, characterized in that the axial apertures (6) are present only in a region which extends axially at most over 1.2 m, in particular at most 1 m of the screw shaft (3) .
  10. Screw press according to one of the preceding claims, characterized in that there are no apertures (6) in the region of the inlet opening (7).
  11. Screw press according to one of the preceding claims, characterized in that the screw helix (4) has a maximum of 8, preferably a maximum of 5 apertures (6).
  12. Screw press according to one of the preceding claims, characterized in that at least some, preferably all of the apertures (6) reach as far as the screw shaft (3) .
  13. Screw press according to one of the preceding claims, characterized in that the cross-sectional area of the apertures (6) decreases from aperture (6) to aperture (6) in the conveying direction (10).
  14. Screw press according to one of the preceding claims, characterized in that the respective distance between two adjacent axial apertures (6) is approximately the same in the circumferential direction.
EP16715500.1A 2015-06-03 2016-04-07 Screw press Active EP3302952B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015210265.3A DE102015210265A1 (en) 2015-06-03 2015-06-03 screw Press
PCT/EP2016/057564 WO2016192873A1 (en) 2015-06-03 2016-04-07 Screw press

Publications (2)

Publication Number Publication Date
EP3302952A1 EP3302952A1 (en) 2018-04-11
EP3302952B1 true EP3302952B1 (en) 2021-11-03

Family

ID=55701947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16715500.1A Active EP3302952B1 (en) 2015-06-03 2016-04-07 Screw press

Country Status (3)

Country Link
EP (1) EP3302952B1 (en)
DE (1) DE102015210265A1 (en)
WO (1) WO2016192873A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021126120B4 (en) 2021-10-08 2024-10-24 Voith Patent Gmbh screw press

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4152179B2 (en) * 2002-12-06 2008-09-17 株式会社クボタ Screw press and dewatering method
DE10315587A1 (en) * 2003-04-05 2004-10-14 Fan Separator Gmbh Separating apparatus for separating solids from highly viscous fluids, includes sieve having separating ranges that separate solids from highly viscous fluids supplied by double barreled auger which is driven by motor
DE202006000583U1 (en) * 2006-01-13 2006-04-13 Andreas Kufferath Gmbh & Co Kg Worm shaft for worm extruder comprising inlet opening
DE102006002016A1 (en) * 2006-01-13 2007-07-19 Andreas Kufferath Gmbh & Co. Kg Screw shaft for suspension dewatering screw press, with wire basket enclosing screw spiral, includes peripheral surface irregularities on spiral to collect solid components tufts for cleaning basket surface
ITBO20070342A1 (en) * 2007-05-10 2008-11-11 Babbini S P A PRESS FOR MECHANICAL DEHYDRATION
NL2008502C2 (en) * 2012-03-19 2013-09-23 Smicon B V SCREW PRESS.

Also Published As

Publication number Publication date
DE102015210265A1 (en) 2016-12-08
EP3302952A1 (en) 2018-04-11
WO2016192873A1 (en) 2016-12-08

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