EP3036371B1 - Pressure screen - Google Patents

Pressure screen Download PDF

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Publication number
EP3036371B1
EP3036371B1 EP14750229.8A EP14750229A EP3036371B1 EP 3036371 B1 EP3036371 B1 EP 3036371B1 EP 14750229 A EP14750229 A EP 14750229A EP 3036371 B1 EP3036371 B1 EP 3036371B1
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EP
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Prior art keywords
rotor
rotor blades
pressure screen
screen according
suspension
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German (de)
French (fr)
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EP3036371A1 (en
Inventor
Kiyoshi Kokubun
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Voith Patent GmbH
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Voith Patent GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18—Drum screens
    • B07B1/20—Stationary drums with moving interior agitators
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18—Drum screens
    • B07B1/22—Revolving drums
    • B07B1/24—Revolving drums with fixed or moving interior agitators
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18—Drum screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18—Drum screens
    • B07B1/22—Revolving drums

Definitions

  • the invention relates to a pressure sorter for cleaning a pulp suspension with a Siebachse rotationally symmetrical trained, cylindrical sieve, which divides the pressure sorter in a Zulaufraum and a Gutstoffraum, wherein the inlet lying in the sieve inlet chamber at one axial end with a suspension inlet and at the opposite axial end a Rejektauslauf and the Acceptance space with a Gutstoffablauf is in communication and is located in the Zulaufraum a rotor with rotor blades whose axis of rotation corresponds to the Siebachse and rotates relative to the screen element, wherein the rotor blades are arranged distributed over a plurality of perpendicular to the axis of rotation circumferential planes of the rotor, and wherein the expansion of the rotor vanes decreases from the suspension inlet to the reject outlet.
  • Such a pressure sorter is out of the FR 1448814 A known. Pressure screens are used in the processing of paper pulp suspensions, in order to process the pulp suspension in a wet sieving.
  • a pressure sorter includes 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.
  • 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, a screen basket. Due to the relative movement to the surrounding suspension there the wing element at the front a pressure and behind a suction pulse on the screen to be cleared. 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 the energy intake and the risk of clogging with the simplest possible means.
  • the object is achieved in that the width of the annular gap between the rotor and the screen element decreases from the suspension inlet to the reject outlet in stages.
  • the reduction in stages has been preferred. Since the pulp suspension is increasingly set in rotation by the rotor with increasing distance from the suspension feed, the radial expansion of the rotor vanes decreases from the suspension feed to the reject outflow, which has a correspondingly positive effect on the energy requirement.
  • the radial extent of the rotor blades can decrease in steps or continuously. While the step-like decrease is easier to produce, the continuous decrease gives a balanced effect.
  • the rotor In order to additionally counteract blockage, the rotor should have at least one recess in at least one circumferential plane between the rotor blades. Furthermore, it has proved to be optimal if the rotor has at least three circumferential planes with rotor blades and / or each circumferential plane has two rotor blades each and / or the rotor blades have the same shape.
  • the rotor blades adjacent circumferential planes should be arranged circumferentially offset from each other. This also counteracts clogging.
  • the axis of rotation should be inclined or perpendicular to the machine plane. Further advantages with regard to the design and function of the pressure sorter arise when the rotor is inside the sieve element, the sieve element is cylindrical and the rotor is designed as a cylindrical drum.
  • the suspension feed should be arranged below the reject outlet.
  • the pressure sorter has a screen 2, here in the form of a cylindrical screen basket with vertical Siebachse 1, which divides the interior of the pressure sorter in an inlet 3 and an accepts space 4.
  • the pulp suspension is fed via a suspension feed 5 at the lower end of the screen basket.
  • the pulp suspension receives an angular momentum which causes it to move circumferentially.
  • a transport flow is generated as a result of the applied pressure gradient between the lower suspension inlet 5 and located at the upper end of the screen basket Rejektauslauf 6 of the feed chamber 3.
  • this sieve clearer is formed by a rotor 8 rotating in the screen element 2 with rotor blades 9 fastened thereto.
  • the rotor 8 has the shape of a cylindrical drum, wherein the axis of rotation 10 coincides with the Siebachse 1.
  • All rotor blades 9 in this case have the same shape, which leads to a uniform effect on the pulp suspension and the screen element 2.
  • the rotor blades 9 are distributed over several, here three perpendicular to the axis of rotation 10 extending circumferential planes 11 of the rotor 8, wherein each circumferential plane 11 more, here two rotor blades 9 has.
  • the width of the annular gap 12 between the rotor 8 and the screening element 2 decreases from the suspension inlet 5 to the reject outlet 6 in stages.
  • the step-shaped transitions are each between two adjacent circumferential planes 11. Since the screen element 2 has a cylindrical shape, this means that the diameter of the rotor 8 increases discontinuously from bottom to top.
  • the radial extent of the rotor vanes 9 also decreases from the suspension feed 5 to the reject outflow 6.
  • the invention is also successful in other forms of rotor blades 9.
  • the production is particularly simple if the rotor blades 9 are formed by elevations on the rotor 8.
  • the radial extent of the rotor blades 9 decreases in stages, i. the height of the elevations on the rotor 8 decreases from the suspension inlet 5 to the reject outlet 6 in stages, whereby here too the steps lie between the circumferential planes 11.
  • the running in the direction of rotation of the rotor 8 cross-sectional area of the rotor blade 9 is formed as a rectangle.
  • the rotor blades cover 9 a circumferential plane 11 completely in the direction of rotation.
  • the rotor 8 in each circumferential plane 11 between the rotor blades 9 has at least one recess 13, which, however, extends only over part of the axial extent of the respective circumferential plane 11.
  • the rotor blades 9 of adjacent circumferential planes 11 are arranged offset from one another in the circumferential direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Combined Means For Separation Of Solids (AREA)

Description

Die Erfindung betrifft einen Drucksortierer zum Reinigen einer Faserstoffsuspension mit einem um eine Siebachse rotationssymmetrisch ausgebildeten, zylindrischen Siebelement, welches den Drucksortierer in einen Zulaufraum und einen Gutstoffraum aufteilt, wobei der im Siebelement liegende Zulaufraum an einem axialen Ende mit einem Suspensionszulauf sowie am gegenüberliegenden axialen Ende mit 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, wobei die Rotorflügel über mehrere senkrecht zur Rotationsachse verlaufenden Umfangsebenen des Rotors verteilt angeordnet sind, und wobei die Ausdehnung der Rotorflügel vom Suspensionszulauf zum Rejektauslauf abnimmt.The invention relates to a pressure sorter for cleaning a pulp suspension with a Siebachse rotationally symmetrical trained, cylindrical sieve, which divides the pressure sorter in a Zulaufraum and a Gutstoffraum, wherein the inlet lying in the sieve inlet chamber at one axial end with a suspension inlet and at the opposite axial end a Rejektauslauf and the Acceptance space with a Gutstoffablauf is in communication and is located in the Zulaufraum a rotor with rotor blades whose axis of rotation corresponds to the Siebachse and rotates relative to the screen element, wherein the rotor blades are arranged distributed over a plurality of perpendicular to the axis of rotation circumferential planes of the rotor, and wherein the expansion of the rotor vanes decreases from the suspension inlet to the reject outlet.

Ein derartiger Drucksortierer ist aus der FR 1448814 A bekannt. Drucksortierer werden bei der Aufbereitung von Papierfaserstoffsuspensionen eingesetzt, und zwar um die Faserstoffsuspension in einer Nasssiebung zu bearbeiten. Dazu enthält ein solcher 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.Such a pressure sorter is out of the FR 1448814 A known. Pressure screens are used in the processing of paper pulp suspensions, in order to process the pulp suspension in a wet sieving. For this purpose, such a pressure sorter includes 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.

Denkbar ist auch der Einsatz zur Trennung unterschiedlicher Faserbestandteile, also der kürzeren von den längeren Fasern.It is also conceivable to use for the separation of different fiber components, so the shorter of the longer fibers.

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.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, a screen basket. Due to the relative movement to the surrounding suspension there the wing element at the front a pressure and behind a suction pulse on the screen to be cleared. 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.

Nachteilig sind bei den bekannten Drucksortierern die hohe Energieaufnahme im Verhältnis zum Durchsatz des Siebelementes und die Verstopfungsgefahr.Disadvantages of the known pressure sorters are the high energy consumption in relation to the throughput of the sieve element and the risk of clogging.

Die Aufgabe der Erfindung ist es daher die Energieaufnahme und die Verstopfungsgefahr mit möglichst einfachen Mitteln zu vermindern.The object of the invention is therefore to reduce the energy intake and the risk of clogging with the simplest possible means.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass die Breite des Ringspaltes zwischen dem Rotor und dem Siebelement vom Suspensionszulauf zum Rejektauslauf in Stufen abnimmt.According to the invention, the object is achieved in that the width of the annular gap between the rotor and the screen element decreases from the suspension inlet to the reject outlet in stages.

Die mit dem kleineren Ringspalt zunehmende Durchströmung wirkt sehr effektiv einer Verstopfung entgegen.The increasing flow with the smaller annular gap counteracts constipation very effectively.

Im Hinblick auf eine einfache Herstellbarkeit wurde die Verminderung in Stufen vorgezogen. Da die Faserstoffsuspension mit zunehmender Entfernung vom Suspensionszulauf immer mehr vom Rotor in Rotation versetzt wird, nimmt die radiale Ausdehnung der Rotorflügel vom Suspensionszulauf zum Rejektauslauf ab, was sich entsprechend positiv auf den Energiebedarf auswirkt. Die radiale Ausdehnung der Rotorflügel kann in Stufen oder kontinuierlich abnehmen. Während die stufenförmige Abnahme einfacher herzustellen ist, ergibt die kontinuierliche Abnahme eine ausgeglichene Wirkung.In view of ease of manufacture, the reduction in stages has been preferred. Since the pulp suspension is increasingly set in rotation by the rotor with increasing distance from the suspension feed, the radial expansion of the rotor vanes decreases from the suspension feed to the reject outflow, which has a correspondingly positive effect on the energy requirement. The radial extent of the rotor blades can decrease in steps or continuously. While the step-like decrease is easier to produce, the continuous decrease gives a balanced effect.

Um einer Verstopfung zusätzlich zu begegnen, sollte der Rotor in wenigstens einer Umfangsebene zwischen den Rotorflügeln zumindest eine Aussparung aufweisen. Des Weiteren hat es sich als optimal erwiesen, wenn der Rotor zumindest drei Umfangsebenen mit Rotorflügeln aufweist und/oder jede Umfangsebene jeweils zwei Rotorflügel besitzt und/oder die Rotorflügel dieselbe Form haben.In order to additionally counteract blockage, the rotor should have at least one recess in at least one circumferential plane between the rotor blades. Furthermore, it has proved to be optimal if the rotor has at least three circumferential planes with rotor blades and / or each circumferential plane has two rotor blades each and / or the rotor blades have the same shape.

Außerdem sollten die Rotorflügel benachbarter Umfangsebenen in Umfangsrichtung versetzt zueinander angeordnet sein. Auch dies wirkt dem Verstopfen entgegen.In addition, the rotor blades adjacent circumferential planes should be arranged circumferentially offset from each other. This also counteracts clogging.

Um eine Querströmung in axialer Richtung über das Siebelement hinweg zu erreichen, sollte die Rotationsachse schräg oder senkrecht auf der Maschinenebene stehen.
Vorteile hinsichtlich Gestaltung und Funktion des Drucksortierers ergeben sich des Weiteren, wenn sich der Rotor innerhalb des Siebelementes befindet, das Siebelement zylindrisch und der Rotor als zylindrische Trommel ausgebildet sind.In order to achieve a transverse flow in the axial direction across the sieve element, the axis of rotation should be inclined or perpendicular to the machine plane.
Further advantages with regard to the design and function of the pressure sorter arise when the rotor is inside the sieve element, the sieve element is cylindrical and the rotor is designed as a cylindrical drum.

Dabei sollte der Suspensionszulauf unter dem Rejektauslauf angeordnet sein.The suspension feed should be arranged below the reject outlet.

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

  • Figur 1: einen schematischen Querschnitt durch einen Drucksortierer parallel zur Rotationsachse 10 und
  • Figur 2: einen Querschnitt durch den Rotor 8 senkrecht zur Rotationsachse 10.
The invention will be explained in more detail with reference to an exemplary embodiment. In the attached drawing shows:
  • FIG. 1 a schematic cross section through a pressure sorter parallel to the axis of rotation 10 and
  • FIG. 2 : a cross section through the rotor 8 perpendicular to the axis of rotation 10th

Wie in Figur 1 zu erkennen, besitzt der Drucksortierer ein Siebelement 2, hier in Form eines zylindrischen Siebkorbes mit senkrechter Siebachse 1, welches den Innenraum des Drucksortierers in einen Zulaufraum 3 und einen Gutstoffraum 4 aufteilt.As in FIG. 1 To recognize, the pressure sorter has a screen 2, here in the form of a cylindrical screen basket with vertical Siebachse 1, which divides the interior of the pressure sorter in an inlet 3 and an accepts space 4.

In den Zulaufraum 3 wird über einen Suspensionszulauf 5 am unteren Ende des Siebkorbes die Faserstoffsuspension zugeführt.In the inlet chamber 3, the pulp suspension is fed via a suspension feed 5 at the lower end of the screen basket.

Bei dem hier verwendeten Drucksortierer erhält die Faserstoffsuspension einen Drehimpuls, der sie in eine Umfangsbewegung versetzt. Zusätzlich hierzu wird in Folge des anliegenden Druckgefälles zwischen dem unteren Suspensionszulauf 5 und dem am oberen Ende des Siebkorbes befindlichen Rejektauslauf 6 des Zulaufraumes 3 eine Transportströmung erzeugt.In the pressure sorter used here, the pulp suspension receives an angular momentum which causes it to move circumferentially. In addition, a transport flow is generated as a result of the applied pressure gradient between the lower suspension inlet 5 and located at the upper end of the screen basket Rejektauslauf 6 of the feed chamber 3.

Auf dem Weg dieser Transportströmung wird ein großer Teil der Faserstoffsuspension bestimmungsgemäß durch das Siebelement 2 als Gutstoff in den Gutstoffraum 4 abgeleitet und von dort über den oberen Gutstoffablauf 7 abgeführt. Dabei tritt auch zumindest ein großer Teil der in der Faserstoffsuspension enthaltenen Fasern in den Gutstoffraum 4 über.
Der vom Siebelement 2 abgewiesene Teil der Faserstoffsuspension wird als Rejekt über den Rejektauslauf 6 aus dem Zulaufraum 3 gefördert.On the way of this transport flow, a large part of the pulp suspension is intended derived by the sieve 2 as accepts in the accepts space 4 and discharged from there via the upper Gutstoffablauf 7. In this case, at least a large part of the fibers contained in the pulp suspension passes into the accepts space 4.
The rejected from the screening element 2 part of the pulp suspension is conveyed as a reject over the Rejektauslauf 6 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 8 mit daran befestigten Rotorflügeln 9 gebildet. Dabei hat der Rotor 8 die Form einer zylindrischen Trommel, wobei die Rotationsachse 10 mit der Siebachse 1 übereinstimmt.According to the invention, this sieve clearer is formed by a rotor 8 rotating in the screen element 2 with rotor blades 9 fastened thereto. In this case, the rotor 8 has the shape of a cylindrical drum, wherein the axis of rotation 10 coincides with the Siebachse 1.

Alle Rotorflügel 9 haben hierbei die gleiche Form, was zu einer gleichmäßigen Wirkung auf die Faserstoffsuspension und das Siebelement 2 führt.All rotor blades 9 in this case have the same shape, which leads to a uniform effect on the pulp suspension and the screen element 2.

Außerdem sind die Rotorflügel 9 über mehrere, hier drei senkrecht zur Rotationsachse 10 verlaufende Umfangsebenen 11 des Rotors 8 verteilt angeordnet, wobei jede Umfangsebene 11 mehrere, hier zwei Rotorflügel 9 besitzt.In addition, the rotor blades 9 are distributed over several, here three perpendicular to the axis of rotation 10 extending circumferential planes 11 of the rotor 8, wherein each circumferential plane 11 more, here two rotor blades 9 has.

Wesentlich ist jedoch, dass die Breite des Ringspaltes 12 zwischen dem Rotor 8 und dem Siebelement 2 vom Suspensionszulauf 5 zum Rejektauslauf 6 in Stufen abnimmt. Zweckmäßigerweise befinden sich die stufenförmigen Übergänge jeweils zwischen zwei benachbarten Umfangsebenen 11. Da das Siebelement 2 eine zylindrische Form hat, bedeutet dies, dass sich der Durchmesser des Rotors 8 diskontinuierlich von unten nach oben vergrößert.It is essential, however, that the width of the annular gap 12 between the rotor 8 and the screening element 2 decreases from the suspension inlet 5 to the reject outlet 6 in stages. Conveniently, the step-shaped transitions are each between two adjacent circumferential planes 11. Since the screen element 2 has a cylindrical shape, this means that the diameter of the rotor 8 increases discontinuously from bottom to top.

Dies wirkt sich sehr positiv auf den Energiebedarf des Drucksortierers aus.This has a very positive effect on the energy requirements of the pressure sorter.

Um dies noch weiter zu unterstützen, nimmt auch die radiale Ausdehnung der Rotorflügel 9 vom Suspensionszulauf 5 zum Rejektauslauf 6 ab.To further support this, the radial extent of the rotor vanes 9 also decreases from the suspension feed 5 to the reject outflow 6.

Prinzipiell ist die Erfindung auch bei anderen Formen von Rotorflügeln 9 erfolgreich. Allerdings ist die Herstellung besonders einfach, wenn die Rotorflügel 9 von Erhebungen auf dem Rotor 8 gebildet werden.In principle, the invention is also successful in other forms of rotor blades 9. However, the production is particularly simple if the rotor blades 9 are formed by elevations on the rotor 8.

Aus gleichem Grund ist es vorteilhaft, wenn die radiale Ausdehnung der Rotorflügel 9 in Stufen abnimmt, d.h. die Höhe der Erhebungen auf dem Rotor 8 vom Suspensionszulauf 5 zum Rejektauslauf 6 in Stufen abnimmt, wobei auch hier die Stufen zwischen den Umfangsebenen 11 liegen.For the same reason, it is advantageous if the radial extent of the rotor blades 9 decreases in stages, i. the height of the elevations on the rotor 8 decreases from the suspension inlet 5 to the reject outlet 6 in stages, whereby here too the steps lie between the circumferential planes 11.

Dabei ist die in Rotationsrichtung des Rotors 8 verlaufende Querschnittsfläche der Rotorflügel 9 als Rechteck ausgebildet.In this case, the running in the direction of rotation of the rotor 8 cross-sectional area of the rotor blade 9 is formed as a rectangle.

Außerdem überdecken sich die Rotorflügel 9 einer Umfangsebene 11 in Rotationsrichtung vollständig.In addition, the rotor blades cover 9 a circumferential plane 11 completely in the direction of rotation.

Um die Verstopfungsgefahr noch weiter zu senken, hat der Rotor 8 in jeder Umfangsebene 11 zwischen den Rotorflügeln 9 zumindest eine Aussparung 13, die sich allerdings nur über einen Teil der axialen Ausdehnung der jeweiligen Umfangsebene 11 erstreckt.In order to further reduce the risk of clogging, the rotor 8 in each circumferential plane 11 between the rotor blades 9 has at least one recess 13, which, however, extends only over part of the axial extent of the respective circumferential plane 11.

Des Weiteren sind die Rotorflügel 9 benachbarter Umfangsebenen 11 in Umfangsrichtung versetzt zueinander angeordnet.Furthermore, the rotor blades 9 of adjacent circumferential planes 11 are arranged offset from one another in the circumferential direction.

Claims (10)

  1. Pressure screen for cleaning a fibrous stock suspension, having a cylindrical screen element (2) which is formed rotationally symmetrically about a screen axis (1) and divides the pressure screen into an inlet chamber (3) and an accepted stock chamber (4), the inlet chamber (3) located in the screen element (2) being connected at one axial end to a suspension inlet (5) and at the opposite axial end to a reject outlet (6), and the accepted stock chamber (4) being connected to an accepted stock outlet (7), and a rotor (8) with rotor blades (9) being located in the inlet chamber (3), the rotational axis (10) of which rotor (8) corresponds to the screen axis (1), and which rotor (8) rotates relative to the screen element (2), the rotor blades (9) being arranged in a distributed manner over a plurality of circumferential planes (11) of the rotor (8) which run perpendicularly with respect to the rotational axis (10), the radial extent of the rotor blades (9) decreasing from the suspension inlet (5) to the reject outlet (6),
    characterized in that
    the width of the annular gap (12) between the rotor (8) and the screen element (2) decreases in steps from the suspension inlet (5) to the reject outlet (6).
  2. Pressure screen according to Claim 1,
    characterized in that
    the radial extent of the rotor blades (9) decreases in steps.
  3. Pressure screen according to Claim 1,
    characterized in that
    the radial extent of the rotor blades (9) decreases continuously.
  4. Pressure screen according to one of the preceding claims,
    characterized in that
    the rotor (8) has at least one cut-out (13) between the rotor blades (9) in at least one circumferential plane (11).
  5. Pressure screen according to one of the preceding claims,
    characterized in that
    the rotor (8) has at least three circumferential planes (11) with rotor blades (9).
  6. Pressure screen according to one of the preceding claims,
    characterized in that
    each circumferential plane (11) has respectively two rotor blades (9).
  7. Pressure screen according to one of the preceding claims,
    characterized in that
    the rotor blades (9) of adjacent circumferential planes (11) are arranged to be offset from one another in the circumferential direction.
  8. Pressure screen according to one of the preceding claims,
    characterized in that
    the rotor blades (9) have the same shape.
  9. Pressure screen according to one of the preceding claims,
    characterized in that
    the axis of rotation (10) is vertical.
  10. Pressure screen according to one of the preceding claims,
    characterized in that
    the suspension inlet (5) is arranged underneath the reject outlet (6).
EP14750229.8A 2013-08-20 2014-08-12 Pressure screen Active EP3036371B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013216433.5A DE102013216433A1 (en) 2013-08-20 2013-08-20 pressure screens
PCT/EP2014/067209 WO2015024812A1 (en) 2013-08-20 2014-08-12 Pressure screen

Publications (2)

Publication Number Publication Date
EP3036371A1 EP3036371A1 (en) 2016-06-29
EP3036371B1 true EP3036371B1 (en) 2017-04-19

Family

ID=51301299

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14750229.8A Active EP3036371B1 (en) 2013-08-20 2014-08-12 Pressure screen

Country Status (6)

Country Link
US (1) US9855585B2 (en)
EP (1) EP3036371B1 (en)
JP (1) JP6377159B2 (en)
CN (1) CN105473783B (en)
DE (1) DE102013216433A1 (en)
WO (1) WO2015024812A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023178364A2 (en) * 2022-04-21 2023-09-21 Kadant Black Clawson Llc Rotor with forward-swept struts for pressure screen cylinders

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GB2222967A (en) 1988-09-19 1990-03-28 Voith Gmbh J M Appliance for screening fibrous suspensions
EP2602386A1 (en) 2010-07-09 2013-06-12 Voith Patent GmbH Screen device
GB2602386A (en) 2021-11-10 2022-06-29 Bluefin Trading Ltd Water sport board and anchor point for a water sport board

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EP2602386A1 (en) 2010-07-09 2013-06-12 Voith Patent GmbH Screen device
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Also Published As

Publication number Publication date
DE102013216433A1 (en) 2015-03-12
WO2015024812A1 (en) 2015-02-26
JP6377159B2 (en) 2018-08-22
CN105473783A (en) 2016-04-06
US20160158804A1 (en) 2016-06-09
CN105473783B (en) 2018-02-06
US9855585B2 (en) 2018-01-02
JP2016531215A (en) 2016-10-06
EP3036371A1 (en) 2016-06-29

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