EP2732094B1 - Pressure screen - Google Patents

Pressure screen Download PDF

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Publication number
EP2732094B1
EP2732094B1 EP12729158.1A EP12729158A EP2732094B1 EP 2732094 B1 EP2732094 B1 EP 2732094B1 EP 12729158 A EP12729158 A EP 12729158A EP 2732094 B1 EP2732094 B1 EP 2732094B1
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EP
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Prior art keywords
suspension
screen
rotor
inlet
flow direction
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EP12729158.1A
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German (de)
French (fr)
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EP2732094A1 (en
Inventor
Martin Störzer
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Voith Patent GmbH
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Voith Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the invention relates to a pressure sorter for cleaning a pulp suspension with a Siebense rotationally symmetrical trained sieve element, which divides the pressure sorter in a Zulaufraum and a Acceptance space, the Zulaufraum with a suspension inlet and a Rejektauslauf and the Gutstoffraum with a Gutstoffablauf in connection and is in Zulaufraum a rotor is located with rotor blades whose axis of rotation corresponds to the Siebachse and rotates relative to the screen element.
  • Pressure screens are used in the processing of paper pulp suspensions, in order to process the pulp suspension in a wet sieving.
  • the fibers contained in the suspension are to pass through the openings as accept, while the unwanted solid constituents are rejected thereon and discharged as a reject again from the sorter. It is also conceivable to use for the separation of different fiber components, so the shorter of the longer fibers.
  • sorting holes round holes or slots are usually used.
  • pressure sorters of the type considered here are provided with screen scrapers having reaming surfaces moved past the screen. As a result, clogging of the screen openings is prevented in a manner known per se.
  • a Sieb thriftr become known, which is provided with wing elements for the clearance of the screen.
  • These wing elements have a hydrodynamic profile which extends over the entire length of the screen element of a screen basket. Due to the relative movement to the surrounding suspension, the wing element at the front gives a pressure and, behind it, a suction pulse clearing sieve. Thereby, a part of the suspension, which was rejected on the screen or has already passed through the screen as accepts, sucked back, whereby the screen openings are kept free or cleared.
  • the rotor blades are for example in the DE-OS 3701669 formed by surveys.
  • the object of the invention is therefore to reduce energy consumption and pulsations.
  • this object is achieved in that the distance between the axis of rotation and in the flow direction through the centroid of the perpendicular to the flow direction extending cross-sectional area of the suspension inlet going straight line is less than 1.0 times, preferably less than 0.7 times the radius of the screen element.
  • the suspension Since the suspension is not injected tangentially, it also has no or at least a reduced rotational flow when entering the inlet space. Consequently, exclusively or predominantly the rotor is responsible for generating the rotational flow in the inlet space.
  • the flow direction forms an angle of at least 10 °, preferably at least 20 ° and in particular at least 35 ° with all tangents on the screen element in the region of the suspension feed.
  • the suspension inlet In order to change the position of the centroid of the perpendicular to the flow direction extending cross-sectional area of the suspension inlet, the suspension inlet should have a flow cross section influencing, preferably adjustable aperture.
  • the flow direction in the suspension feed runs horizontally or inclined from above directly in front of the feed space, wherein the flow direction with the horizontal forms an angle between 0 and 90 °, preferably between 0 and 60 °.
  • the distance between the axis of rotation and the straight line passing in the flow direction through the centroid of the cross-sectional area of the suspension feed running perpendicular to the flow direction can be zero or greater than zero.
  • the axis of rotation should stand vertically.
  • other orientations, for example, lying arrangements are possible.
  • FIG. 1 can be seen a pressure sorter according to the invention with a screen element 2, here in the form of a cylindrical screen basket with vertical Siebachse 10, which divides the interior of the pressure sorter in an inlet space 3 and an accepts space 4.
  • a screen element 2 here in the form of a cylindrical screen basket with vertical Siebachse 10, which divides the interior of the pressure sorter in an inlet space 3 and an accepts space 4.
  • the pulp suspension 1 is fed via a suspension feed 11.
  • the rejected from the screening element 2 part of the pulp suspension 1 is conveyed as a reject 18 via the Rejektauslauf 12 from the inlet space 3.
  • this sieve scraper is formed by a rotor 5 rotating in the screen element 2 with rotor blades attached thereto.
  • the rotor 5 here has the form of a cylindrical drum, the axis of rotation 7 coincides with the Siebachse 10.
  • the rotor blades are arranged distributed over a plurality of perpendicular to the rotation axis 7 extending circumferential planes of the rotor 5.
  • the rotor blades are formed as elevations on the rotor 5, which accordingly have no radial distance to the rotor 5.
  • the running in the direction of rotation 16 of the rotor 5 cross-sectional area of the rotor blades is formed as a rectangle.
  • the rotor blades can also be designed differently, for example with a wing profile.
  • the pulp suspension 1 receives no or only a reduced angular momentum. This makes it possible to operate the rotor 5 at a lower speed, so that on the one hand less energy is required and on the other hand, lower pulsations emanate from the rotor 5.
  • the flow direction 14 forms on the suspension feed 11 with each tangent on the screen element 2 an angle 19 of at least 10 °, preferably at least 20 ° and in particular at least 35 °.
  • the suspension feed 11 can accordingly FIG. 4 have a flow cross-section changing, preferably adjustable aperture 8.

Description

Die Erfindung betrifft einen Drucksortierer zum Reinigen einer Faserstoffsuspension mit einem um eine Siebachse rotationssymmetrisch ausgebildeten Siebelement, welches den Drucksortierer in einen Zulaufraum und einen Gutstoffraum aufteilt, wobei der Zulaufraum mit einem Suspensionszulauf sowie einem Rejektauslauf und der Gutstoffraum mit einem Gutstoffablauf in Verbindung steht und sich im Zulaufraum ein Rotor mit Rotorflügeln befindet, dessen Rotationsachse der Siebachse entspricht und der relativ zum Siebelement rotiert.The invention relates to a pressure sorter for cleaning a pulp suspension with a Siebense rotationally symmetrical trained sieve element, which divides the pressure sorter in a Zulaufraum and a Acceptance space, the Zulaufraum with a suspension inlet and a Rejektauslauf and the Gutstoffraum with a Gutstoffablauf in connection and is in Zulaufraum a rotor is located with rotor blades whose axis of rotation corresponds to the Siebachse and rotates relative to the screen element.

Drucksortierer werden bei der Aufbereitung von Papierfaserstoffsuspensionen eingesetzt, und zwar um die Faserstoffsuspension in einer Nasssiebung zu bearbeiten. Dazu enthält ein solcher, beispielsweise in der EP 1 124 003 A2 beschriebener und den Oberbegriff des Anspruchs 1 bildender Drucksortierer ein Siebelement, das mit einer Vielzahl von Öffnungen versehen ist. Die in der Suspension enthaltenen Fasern sollen als Gutstoff durch die Öffnungen hindurchtreten, während die nicht gewünschten festen Bestandteile daran abgewiesen und als Rejekt aus dem Sortierer wieder herausgeleitet werden. Denkbar ist auch der Einsatz zur Trennung unterschiedlicher Faserbestandteile, also der kürzeren von den längeren Fasern. Als Sortieröffnungen werden in der Regel runde Löcher oder Schlitze verwendet. In den meisten Fällen werden Drucksortierer der hier betrachteten Art mit Siebräumern versehen, die an dem Sieb vorbeibewegte Räumflächen aufweisen. Dadurch wird in an sich bekannter Weise das Zusetzen der Sieböffnungen verhindert.Pressure screens are used in the processing of paper pulp suspensions, in order to process the pulp suspension in a wet sieving. This includes such, for example in the EP 1 124 003 A2 described and forming the preamble of claim 1 pressure sorter a sieve element which is provided with a plurality of openings. The fibers contained in the suspension are to pass through the openings as accept, while the unwanted solid constituents are rejected thereon and discharged as a reject again from the sorter. It is also conceivable to use for the separation of different fiber components, so the shorter of the longer fibers. As sorting holes round holes or slots are usually used. In most cases, pressure sorters of the type considered here are provided with screen scrapers having reaming surfaces moved past the screen. As a result, clogging of the screen openings is prevented in a manner known per se.

Aus der WO 98/53135 ist ein Siebräumer bekannt geworden, der mit Flügelelementen für die Räumung des Siebes versehen ist. Diese Flügelelemente haben ein hydrodynamisches Profil, das sich über die ganze Länge des Siebelementes eines Siebkorbes erstreckt. Durch die Relativbewegung zur umgebenden Suspension gibt das Flügelelement vorne einen Druck- und dahinter einen Saugimpuls auf das zu räumende Sieb ab. Dadurch wird ein Teil der Suspension, die am Sieb abgewiesen wurde oder bereits das Sieb als Gutstoff passiert hat, zurückgesaugt, wodurch die Sieböffnungen freigehalten bzw. freigemacht werden.From the WO 98/53135 is a Siebräumer become known, which is provided with wing elements for the clearance of the screen. These wing elements have a hydrodynamic profile which extends over the entire length of the screen element of a screen basket. Due to the relative movement to the surrounding suspension, the wing element at the front gives a pressure and, behind it, a suction pulse clearing sieve. Thereby, a part of the suspension, which was rejected on the screen or has already passed through the screen as accepts, sucked back, whereby the screen openings are kept free or cleared.

Im Unterschied hierzu werden die Rotorflügel beispielsweise in der DE-OS 3701669 von Erhebungen gebildet.In contrast, the rotor blades are for example in the DE-OS 3701669 formed by surveys.

Unabhängig von der Gestaltung der Rotorflügel wird in der Praxis eine umfassende Wirkung der Rotorflügel durch ein Überlappen derselben in Umfangsrichtung angestrebt. Dabei sorgt die gleiche Gestaltung der Rotorflügel für eine Vergleichmäßigung der Wirkung.Irrespective of the design of the rotor blades, in practice a comprehensive effect of the rotor blades is sought by overlapping them in the circumferential direction. The same design of the rotor blades ensures a homogenization of the effect.

Nachteilig sind bei den bekannten Drucksortierern jedoch neben der hohen Energieaufnahme auch Pulsationen, die bei Sortierern im Konstantteil zu Schwankungen beim Flächengewicht der Faserstoffbahn führen können. Die Pulsationen gehen dabei im Wesentlichen vom Rotor aus.Disadvantages of the known pressure sorters, however, are not only the high energy absorption but also pulsations, which in the case of sorters in the constant part can lead to fluctuations in the basis weight of the fibrous web. The pulsations essentially start from the rotor.

Die Dämpfung dieser Pulsationen ist mit erheblichem Aufwand verbunden und erfolgt bisher entweder über einen Pulsationsdämpfertank vor dem Stoffauflauf oder über eine spezielle Gestaltung des Gutstoffablaufs.The attenuation of these pulsations is associated with considerable effort and is done either via a Pulsationsdämpfertank before the headbox or a special design of Gutstoffablaufs.

Die Aufgabe der Erfindung ist es daher den Energieverbrauch sowie die Pulsationen zu vermindern.The object of the invention is therefore to reduce energy consumption and pulsations.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass der Abstand zwischen der Rotationsachse und der in Strömungsrichtung durch den Flächenschwerpunkt der senkrecht zur Strömungsrichtung verlaufenden Querschnittsfläche des Suspensionszulaufes gehenden Geraden kleiner als das 1,0fache, vorzugsweise kleiner als das 0,7fache des Radius des Siebelementes ist.According to the invention, this object is achieved in that the distance between the axis of rotation and in the flow direction through the centroid of the perpendicular to the flow direction extending cross-sectional area of the suspension inlet going straight line is less than 1.0 times, preferably less than 0.7 times the radius of the screen element.

Da die Suspension nicht tangential eingedüst wird, besitzt sie auch keine oder zumindest eine verminderte Rotationsströmung beim Eintritt in den Zulaufraum. Für die Erzeugung der Rotationsströmung im Zulaufraum ist folglich ausschließlich oder überwiegend der Rotor zuständig.Since the suspension is not injected tangentially, it also has no or at least a reduced rotational flow when entering the inlet space. Consequently, exclusively or predominantly the rotor is responsible for generating the rotational flow in the inlet space.

Dies wiederum erlaubt es, die Drehzahl des Rotors zu vermindern, was sich entsprechend positiv auf den Energieverbrauch sowie die Pulsationen auswirkt.This in turn makes it possible to reduce the speed of the rotor, which has a correspondingly positive effect on energy consumption and pulsations.

Die Maschine wird hierdurch einfacher. Außerdem wird die Wirkung des Rotors optimiert.This makes the machine easier. In addition, the effect of the rotor is optimized.

Dabei hat es sich als vorteilhaft erwiesen, wenn die Strömungsrichtung mit allen Tangenten am Siebelement im Bereich des Suspensionszulaufs einen Winkel von mindestens 10° bildet, vorzugsweise von mindestens 20° und insbesondere zumindest 35° bildet.It has proved to be advantageous if the flow direction forms an angle of at least 10 °, preferably at least 20 ° and in particular at least 35 ° with all tangents on the screen element in the region of the suspension feed.

Um die Lage des Flächenschwerpunktes der senkrecht zur Strömungsrichtung verlaufenden Querschnittsfläche des Suspensionszulaufes verändern zu können, sollte der Suspensionszulauf eine den Strömungsquerschnitt beeinflussende, vorzugsweise verstellbare Blende besitzen.In order to change the position of the centroid of the perpendicular to the flow direction extending cross-sectional area of the suspension inlet, the suspension inlet should have a flow cross section influencing, preferably adjustable aperture.

Für eine optimale Einmischung der Suspension ist es von Vorteil, wenn die Strömungsrichtung im Suspensionszulauf unmittelbar vor dem Zulaufraum horizontal oder von oben geneigt verläuft, wobei die Strömungsrichtung mit der Horizontalen einen Winkel zwischen 0 und 90°, vorzugsweise zwischen 0 und 60° bildet. Des Weiteren kann der Abstand zwischen der Rotationsachse und der in Strömungsrichtung durch den Flächenschwerpunkt der senkrecht zur Strömungsrichtung verlaufenden Querschnittsfläche des Suspensionszulaufes gehenden Geraden Null oder aber größer als Null sein.For optimum mixing of the suspension, it is advantageous if the flow direction in the suspension feed runs horizontally or inclined from above directly in front of the feed space, wherein the flow direction with the horizontal forms an angle between 0 and 90 °, preferably between 0 and 60 °. Furthermore, the distance between the axis of rotation and the straight line passing in the flow direction through the centroid of the cross-sectional area of the suspension feed running perpendicular to the flow direction can be zero or greater than zero.

Im Interesse einer gleichmäßigen Wirkungsverteilung sollte die Rotationsachse senkrecht stehen. Allerdings sind auch andere Ausrichtungen, beispielsweise liegende Anordnungen möglich.In the interest of a uniform distribution of effects, the axis of rotation should stand vertically. However, other orientations, for example, lying arrangements are possible.

Vorteile hinsichtlich Gestaltung und Funktion des Drucksortierers ergeben sich des Weiteren, wenn sich der Rotor innerhalb des Siebelementes befindet und das Siebelement zylindrisch ausgebildet ist.Further advantages with regard to the design and function of the pressure sorter arise when the rotor is located inside the sieve element and the sieve element is cylindrical.

Nachfolgend soll die Erfindung an mehreren Ausführungsbeispielen näher erläutert werden.The invention will be explained in more detail below with reference to several exemplary embodiments.

In der beigefügten Zeichnung zeigt:

  • Figur 1: einen schematischen Längsschnitt durch einen Drucksortierer;
  • Figur 2: einen Teil-Längsschnitt mit geneigtem Suspensionszulauf 11;
  • Figur 3: einen Querschnitt mit versetztem Suspensionszulauf 11 und
  • Figur 4: einen Suspensionszulauf 11 mit Blende 8.
In the attached drawing shows:
  • FIG. 1 a schematic longitudinal section through a pressure sorter;
  • FIG. 2 a partial longitudinal section with inclined suspension inlet 11;
  • FIG. 3 a cross section with added suspension feed 11 and
  • FIG. 4 : a suspension feed 11 with aperture 8.

In Figur 1 erkennt man einen erfindungsgemäßen Drucksortierer mit einem Siebelement 2, hier in Form eines zylindrischen Siebkorbes mit senkrechter Siebachse 10, welches den Innenraum des Drucksortierers in einen Zulaufraum 3 und einen Gutstoffraum 4 aufteilt.In FIG. 1 can be seen a pressure sorter according to the invention with a screen element 2, here in the form of a cylindrical screen basket with vertical Siebachse 10, which divides the interior of the pressure sorter in an inlet space 3 and an accepts space 4.

In den Zulaufraum 3 wird über einen Suspensionszulauf 11 die Faserstoffsuspension 1 zugeführt.In the inlet space 3, the pulp suspension 1 is fed via a suspension feed 11.

In Folge des anliegenden Druckgefälles zwischen dem oben gezeichneten Suspensionszulauf 11 und dem unten liegenden Rejektauslauf 12 des Zulaufraumes 3 wird jedoch eine Transportströmung erzeugt.As a result of the applied pressure gradient between the above drawn suspension inlet 11 and the underlying Rejektauslauf 12 of the feed chamber 3, however, a transport flow is generated.

Auf dem Weg dieser Transportströmung wird ein großer Teil der Faserstoffsuspension 1 bestimmungsgemäß durch das Siebelement 2 als Gutstoff 17 in den Gutstoffraum 4 abgeleitet und von dort über den Gutstoffablauf 13 abgeführt. Dabei tritt auch zumindest ein großer Teil der in der Faserstoffsuspension 1 enthaltenen Fasern in den Gutstoffraum 4 über.On the way of this transport flow, a large part of the pulp suspension 1 is intended derived by the sieve 2 as accepts 17 in the accepts space 4 and discharged from there via the accepts drain 13. At the same time, at least a large part of the fibers contained in the pulp suspension 1 also passes into the accept chamber 4.

Der vom Siebelement 2 abgewiesene Teil der Faserstoffsuspension 1 wird als Rejekt 18 über den Rejektauslauf 12 aus dem Zulaufraum 3 gefördert.The rejected from the screening element 2 part of the pulp suspension 1 is conveyed as a reject 18 via the Rejektauslauf 12 from the inlet space 3.

Um zu verhindern, dass die Öffnungen des Siebelementes 2 verstopft werden, ist ein an sich bekannter Siebräumer eingesetzt, der sich relativ zum Siebelement 2 bewegt.In order to prevent that the openings of the screen element 2 are clogged, a known Siebräumer is used, which moves relative to the screen element 2.

Erfindungsgemäß wird dieser Siebräumer von einem im Siebelement 2 rotierenden Rotor 5 mit daran befestigten Rotorflügeln gebildet. Dabei hat der Rotor 5 hier die Form einer zylindrischen Trommel, wobei die Rotationsachse 7 mit der Siebachse 10 übereinstimmt.According to the invention, this sieve scraper is formed by a rotor 5 rotating in the screen element 2 with rotor blades attached thereto. Here, the rotor 5 here has the form of a cylindrical drum, the axis of rotation 7 coincides with the Siebachse 10.

Alle Rotorflügel haben hierbei die gleiche Form, was zu einer gleichmäßigen Wirkung auf die Faserstoffsuspension 1 und das Siebelement 2 führt.All rotor blades here have the same shape, which leads to a uniform effect on the pulp suspension 1 and the filter element 2.

Außerdem sind die Rotorflügel über mehrere senkrecht zur Rotationsachse 7 verlaufende Umfangsebenen des Rotors 5 verteilt angeordnet.In addition, the rotor blades are arranged distributed over a plurality of perpendicular to the rotation axis 7 extending circumferential planes of the rotor 5.

In Figur 1 sind die Rotorflügel als Erhebungen auf dem Rotor 5 ausgebildet, die dementsprechend keinen radialen Abstand zum Rotor 5 haben. Dabei ist die in Rotationsrichtung 16 des Rotors 5 verlaufende Querschnittsfläche der Rotorflügel als Rechteck ausgebildet.In FIG. 1 the rotor blades are formed as elevations on the rotor 5, which accordingly have no radial distance to the rotor 5. In this case, the running in the direction of rotation 16 of the rotor 5 cross-sectional area of the rotor blades is formed as a rectangle.

Die Rotorflügel können jedoch auch anders, beispielsweise mit Tragflügelprofil ausgestaltet sein.However, the rotor blades can also be designed differently, for example with a wing profile.

Bei dem hier verwendeten Drucksortierer erhält die Faserstoffsuspension 1 keinen oder lediglich einen verminderten Drehimpuls. Dies erlaubt es, den Rotor 5 mit geringerer Drehzahl zu betreiben, so dass einerseits weniger Energie erforderlich ist und andererseits auch geringere Pulsationen von dem Rotor 5 ausgehen.In the pressure sorter used here, the pulp suspension 1 receives no or only a reduced angular momentum. This makes it possible to operate the rotor 5 at a lower speed, so that on the one hand less energy is required and on the other hand, lower pulsations emanate from the rotor 5.

Daher ist es wichtig, dass wie in Figur 3 zu erkennen, der Abstand 15 zwischen der Rotationsachse 10 und der in Strömungsrichtung 14 durch den Flächenschwerpunkt 6 der senkrecht zur Strömungsrichtung 14 verlaufenden Querschnittsfläche des Suspensionszulaufes 11 gehenden Geraden Null oder wie hier größer als Null und kleiner als das 1,0fache vorzugsweise kleiner als das 0,7fache des Radius des Siebelementes 2 ist. Dabei bildet die Strömungsrichtung 14 am Suspensionszulauf 11 mit jeder Tangente am Siebelement 2 einen Winkel 19 von mindestens 10°, vorzugsweise zumindest 20° und insbesondere wenigstens 35°.Therefore, it is important that as in FIG. 3 to recognize the distance 15 between the Rotation axis 10 and in the flow direction 14 through the centroid 6 of the perpendicular to the flow direction 14 extending cross-sectional area of the suspension feed 11 going straight zero or as here greater than zero and less than 1.0 times, preferably less than 0.7 times the radius of the screen element 2 , In this case, the flow direction 14 forms on the suspension feed 11 with each tangent on the screen element 2 an angle 19 of at least 10 °, preferably at least 20 ° and in particular at least 35 °.

Um den Aufbau des Suspensionszulaufes 11 einfach gestalten zu können, aber dennoch die Lage des Flächenschwerpunktes 6 der senkrecht zur Strömungsrichtung 14 verlaufenden Querschnittsfläche des Suspensionszulaufes 11 verändern zu können, kann der Suspensionszulauf 11 entsprechend Figur 4 eine den Strömungsquerschnitt verändernde, vorzugsweise verstellbare Blende 8 besitzen.In order to be able to design the structure of the suspension feed 11 in a simple manner, but nevertheless to be able to change the position of the centroid 6 of the cross-sectional area of the suspension feed 11 running perpendicular to the flow direction 14, the suspension feed 11 can accordingly FIG. 4 have a flow cross-section changing, preferably adjustable aperture 8.

Zur Unterstützung der Transportströmung kann die Strömungsrichtung 14 im Suspensionszulauf 11 unmittelbar vor dem Zulaufraum 3 mit der Horizontalen einen Winkel 9 zwischen 0 und 60° bilden, d.h. gemäß Figur 2 nach unten geneigt sein.To support the transport flow, the flow direction 14 in the suspension feed 11 immediately before the inlet space 3 with the horizontal angle 9 between 0 and 60 ° form, ie according to FIG. 2 be inclined downwards.

Claims (8)

  1. Pressure screen for cleaning a fibrous suspension (1) by way of a screen element (2) which is configured in a rotationally symmetrical manner about a screen axis (7) and which divides the pressure screen into an inlet space (3) and an accepted stock space (4), wherein the inlet space (3) is connected to a suspension inlet (11) and to a reject outlet (12), and the accepted stock space (4) is connected to an accepted stock outlet (13), and a rotor (5) having rotor wings is located in the inlet space (3), the rotation axis (10) of said rotor (5) corresponding to the screen axis (7), and said rotor (5) rotating relative to the screen element (2), characterized in that the spacing (15) between the rotation axis (10) and the straight line that in the flow direction (14) runs through the centre of area (6) of the cross-sectional area of the suspension inlet (11) that runs perpendicularly to the flow direction (14) is more than zero and less than 1.0 times, preferably less than 0.7 times, the radius of the screen element (2).
  2. Pressure screen according to Claim 1, characterized in that the flow direction (14) at the suspension inlet (11) forms an angle (19) of at least 10° with a tangent on the screen element (2) .
  3. Pressure screen according to either of Claims 1 and 2, characterized in that the flow direction (14) at the suspension outlet (11) forms an angle (19) of at least 20°, preferably at least 35°, with a tangent on the screen element (2).
  4. Pressure screen according to one of the preceding claims, characterized in that the flow direction (14) in the suspension inlet (11) directly in front of the inlet space (3) forms an angle (9) between 0 and 90°, preferably between 0 and 60°, with the horizontal.
  5. Pressure screen according to one of the preceding claims, characterized in that the suspension inlet (11) has a preferably adjustable aperture (8) that influences the flow cross-section.
  6. Pressure screen according to one of the preceding claims, characterized in that the rotation axis (10) is vertical.
  7. Pressure screen according to one of the preceding claims, characterized in that the rotor (5) is located within the screen element (2).
  8. Pressure screen according to one of the preceding claims, characterized in that the screen element (2) is configured so as to be cylindrical.
EP12729158.1A 2011-07-15 2012-06-26 Pressure screen Active EP2732094B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011079230A DE102011079230A1 (en) 2011-07-15 2011-07-15 pressure screens
PCT/EP2012/062287 WO2013010755A1 (en) 2011-07-15 2012-06-26 Pressure screen

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EP2732094A1 EP2732094A1 (en) 2014-05-21
EP2732094B1 true EP2732094B1 (en) 2018-02-28

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EP (1) EP2732094B1 (en)
CN (1) CN103687991B (en)
DE (1) DE102011079230A1 (en)
WO (1) WO2013010755A1 (en)

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Publication number Priority date Publication date Assignee Title
CN108203890A (en) * 2017-12-21 2018-06-26 黄蒋元 Pulp screen
CN210104435U (en) * 2018-09-28 2020-02-21 江门欧佩德晶华轻工机械有限公司 Intelligent pressure screen
DE102018127914A1 (en) * 2018-11-08 2020-05-14 Voith Patent Gmbh Rotor for a heating unit

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FI102980B1 (en) 1997-05-21 1999-03-31 Valmet Corp Wing assembly for pulp sorting machine
SE9901148L (en) * 1999-03-29 2000-06-12 Valmet Fibertech Ab Screening device with a rotatable and stationary screen means
AT408772B (en) * 2000-02-03 2002-03-25 Andritz Ag Maschf SORTER FOR CLEANING A FIBER SUSPENSION

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DE102011079230A1 (en) 2013-01-17
WO2013010755A1 (en) 2013-01-24
CN103687991A (en) 2014-03-26
CN103687991B (en) 2016-08-17
EP2732094A1 (en) 2014-05-21

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