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EP3036371A1 - Pressure screen - Google Patents

Pressure screen

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Publication number
EP3036371A1
EP3036371A1 EP14750229.8A EP14750229A EP3036371A1 EP 3036371 A1 EP3036371 A1 EP 3036371A1 EP 14750229 A EP14750229 A EP 14750229A EP 3036371 A1 EP3036371 A1 EP 3036371A1
Authority
EP
European Patent Office
Prior art keywords
rotor
pressure sorter
sorter according
rotor blades
suspension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14750229.8A
Other languages
German (de)
French (fr)
Other versions
EP3036371B1 (en
Inventor
Kiyoshi Kokubun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP3036371A1 publication Critical patent/EP3036371A1/en
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Links

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
    • 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
    • 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
    • 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 Siebense rotationally symmetrical trained sieve element, which divides the pressure sorter into a Zulaufraum and a Gutstoffraum, the Zulaufraum at one axial end with a suspension inlet and at the opposite axial end with a Rejektauslauf and Gutgutraum is associated with a Gutstoffablauf in connection and in the Zulaufraum a rotor with rotor blades, the axis of rotation of the Siebachse corresponds and rotates relative to the screen element, wherein the rotor blades are arranged distributed over a plurality of perpendicular to the rotation axis circumferential planes of the rotor.
  • 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 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 formed for example in DE-OS 3701669 of surveys.
  • the object of the invention is therefore to reduce the energy intake and the risk of clogging with the simplest possible means.
  • this 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.
  • the width of the annular gap decreases in steps or continuously. In view of ease of manufacture, the reduction in stages is preferable.
  • 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 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.
  • the rotor is located 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.
  • Figure 1 a schematic cross section through a pressure sorter parallel to the axis of rotation 10 and
  • Figure 2 a cross section through the rotor 8 perpendicular to the axis of rotation 10.
  • the pressure sorter has a screen element 2, here in the form of a cylindrical screen basket with vertical Siebachse 1, which the interior of the pressure sorter in an inlet space 3 and a Acceptance space 4 divides.
  • 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 inlet chamber 3.
  • 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.
  • a known Sieblaker is used, which moves relative to the screen element 2.
  • 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 arranged distributed over several, here three perpendicular to the rotation axis 10 extending circumferential planes 1 1 of the rotor 8, wherein each circumferential plane 1 1 more, here two rotor blades 9 has. 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. Expediently, the stepped transitions are each between two adjacent circumferential planes 1 1. 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 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 between the circumferential planes 1 1 lie.
  • 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 blades 9 have not only the same shape but also the same dimensions, which reduces the cost.
  • the rotor blades cover 9 a circumferential plane 1 1 completely in the direction of rotation.
  • the rotor 8 has in each circumferential plane 1 1 between the rotor blades 9 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 adjacent circumferential planes 1 1 offset in the circumferential direction to each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

The invention relates to a pressure screen for cleaning a fibrous stock suspension having a screen element (2) which is of rotationally symmetrical configuration about a screen axis (1) and divides the pressure screen into an inlet chamber (3) and an accepted stock chamber (4), wherein the inlet chamber (3) is 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) is connected to an accepted stock outlet (7), and a rotor (8) with rotor vanes (9) is situated 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), wherein the rotor vanes (9) are arranged distributed over a plurality of circumferential planes (11) of the rotor (8) which run perpendicularly with respect to the rotational axis (10). Here, the energy consumption and the risk of clogging can be reduced by virtue of the fact that the width of the annular gap (12) between the rotor (8) and the screen element (2) decreases from the suspension inlet (5) to the reject outlet (6). (Figure 1)

Description

Drucksortierer  pressure screens

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 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. 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 into a Zulaufraum and a Gutstoffraum, the Zulaufraum at one axial end with a suspension inlet and at the opposite axial end with a Rejektauslauf and Gutgutraum is associated with a Gutstoffablauf in connection and in the Zulaufraum a rotor with rotor blades, the axis of rotation of the Siebachse corresponds and rotates relative to the screen element, wherein the rotor blades are arranged distributed over a plurality of perpendicular to the rotation axis circumferential planes of the rotor.

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. 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 WO 98/53135 a Siebräumer has 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 formed for example in DE-OS 3701669 of 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 abnimmt. According to the invention, this 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.

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.

In Abhängigkeit von der Art des Faserstoffs und/oder des Aufbaus des Drucksortierers kann es vorteilhaft sein, wenn die Breite des Ringspaltes in Stufen oder aber kontinuierlich abnimmt. Im Hinblick auf eine einfache Herstellbarkeit ist die Verminderung in Stufen vorzuziehen.  Depending on the type of pulp and / or the structure of the pressure sorter, it may be advantageous if the width of the annular gap decreases in steps or continuously. In view of ease of manufacture, the reduction in stages is preferable.

Da die Faserstoffsuspension mit zunehmender Entfernung vom Suspensionszulauf immer mehr vom Rotor in Rotation versetzt wird, sollte die radiale Ausdehnung der Rotorflügel vom Suspensionszulauf zum Rejektauslauf abnehmen, was sich entsprechend positiv auf den Energiebedarf auswirkt. Since the pulp suspension is increasingly rotated by the rotor with increasing distance from the suspension feed, the radial extent of the rotor blades should decrease from the suspension feed to the reject outlet, which has a correspondingly positive effect on the energy requirement.

Auch hier kann die radiale Ausdehnung der Rotorflügel in Stufen oder kontinuierlich abnehmen. Während die stufenförmige Abnahme einfacher herzustellen ist, ergibt die kontinuierliche Abnahme eine ausgeglichene Wirkung. 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. Again, the radial extent of the rotor blades in steps or continuously decrease. While the step-like decrease is easier to produce, the continuous decrease gives a balanced effect. 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. Um eine Querströmung in axialer Richtung über das Siebelement hinweg zu erreichen, sollte die Rotationsachse schräg oder senkrecht auf der Maschinenebene stehen. In addition, the rotor blades adjacent circumferential planes should be arranged circumferentially offset from each other. This also counteracts clogging. 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.

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.  Further advantages with regard to the design and function of the pressure sorter arise when the rotor is located 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: The invention will be explained in more detail with reference to an exemplary embodiment. In the attached drawing shows:

Figur 1 : einen schematischen Querschnitt durch einen Drucksortierer parallel zur Rotationsachse 10 und  Figure 1: a schematic cross section through a pressure sorter parallel to the axis of rotation 10 and

Figur 2: einen Querschnitt durch den Rotor 8 senkrecht zur Rotationsachse 10. 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.  Figure 2: a cross section through the rotor 8 perpendicular to the axis of rotation 10. As can be seen in Figure 1, the pressure sorter has a screen element 2, here in the form of a cylindrical screen basket with vertical Siebachse 1, which the interior of the pressure sorter in an inlet space 3 and a Acceptance space 4 divides.

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

Der vom Siebelement 2 abgewiesene Teil der Faserstoffsuspension wird als Rejekt über den Rejektauslauf 6 aus dem Zulaufraum 3 gefördert. 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.  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. 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 1 1 des Rotors 8 verteilt angeordnet, wobei jede Umfangsebene 1 1 mehrere, hier zwei Rotorflügel 9 besitzt. 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 1 1 . Da das Siebelement 2 eine zylindrische Form hat, bedeutet dies, dass sich der Durchmesser des Rotors 8 diskontinuierlich von unten nach oben vergrößert. In addition, the rotor blades 9 are arranged distributed over several, here three perpendicular to the rotation axis 10 extending circumferential planes 1 1 of the rotor 8, wherein each circumferential plane 1 1 more, here two rotor blades 9 has. 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. Expediently, the stepped transitions are each between two adjacent circumferential planes 1 1. 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 To further support this, the radial extent of the

Rotorflügel 9 vom Suspensionszulauf 5 zum Rejektauslauf 6 ab. 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. Rotor blade 9 from the suspension inlet 5 to the reject outlet 6 from. 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 1 1 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 between the circumferential planes 1 1 lie.

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.

Die Rotorflügel 9 haben hierbei nicht nur die gleiche Form sondern auch die gleichen Abmessungen, was die Herstellungskosten senkt. Außerdem überdecken sich die Rotorflügel 9 einer Umfangsebene 1 1 in Rotationsrichtung vollständig. The blades 9 have not only the same shape but also the same dimensions, which reduces the cost. In addition, the rotor blades cover 9 a circumferential plane 1 1 completely in the direction of rotation.

Um die Verstopfungsgefahr noch weiter zu senken, hat der Rotor 8 in jeder Umfangsebene 1 1 zwischen den Rotorflügeln 9 zumindest eine Aussparung 13, die sich allerdings nur über einen Teil der axialen Ausdehnung der jeweiligen Umfangsebene 1 1 erstreckt. In order to reduce the risk of clogging even further, the rotor 8 has in each circumferential plane 1 1 between the rotor blades 9 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 1 1 in Umfangsrichtung versetzt zueinander angeordnet. Furthermore, the rotor blades 9 adjacent circumferential planes 1 1 offset in the circumferential direction to each other.

Claims

Patentansprüche 1 . Drucksortierer zum Reinigen einer Faserstoffsuspension mit einem um eine  Claims 1. Pressure sorter for cleaning a pulp suspension with one around a Siebachse (1 ) rotationssymmetrisch ausgebildeten Siebelement (2), welches den Drucksortierer in einen Zulaufraum (3) und einen Gutstoffraum (4) aufteilt, wobei der Zulaufraum (3) an einem axialen Ende mit einem Suspensionszulauf (5) sowie am gegenüberliegenden axialen Ende mit einem Rejektauslauf (6) und der Gutstoffraum (4) mit einem Gutstoffablauf (7) in Verbindung steht und sich im Siebachse (1) rotationally symmetrical screen element (2), which divides the pressure sorter into an inlet space (3) and an accepts space (4), wherein the inlet space (3) at one axial end with a suspension inlet (5) and at the opposite axial end with a Rejektauslauf (6) and the accepts space (4) with a Gutstoffablauf (7) is in communication and in the Zulaufraum (3) ein Rotor (8) mit Rotorflügeln (9) befindet, dessen Rotationsachse (10) der Siebachse (1 ) entspricht und der relativ zum Siebelement (2) rotiert, wobei die Rotorflügel (9) über mehrere senkrecht zur Rotationsachse (10) verlaufenden Umfangsebenen (1 1 ) des Rotors (8) verteilt angeordnet sind, dadurch gekennzeichnet, dass die Breite des Ringspaltes (12) zwischen demInlet chamber (3) is a rotor (8) with rotor blades (9), the axis of rotation (10) of the Siebachse (1) corresponds and rotates relative to the screen element (2), wherein the rotor blades (9) over a plurality of perpendicular to the axis of rotation (10 ) extending circumferential planes (1 1) of the rotor (8) are arranged distributed, characterized in that the width of the annular gap (12) between the Rotor (8) und dem Siebelement (2) vom Suspensionszulauf (5) zum Rejektauslauf (6) abnimmt. Rotor (8) and the screen element (2) from the suspension inlet (5) to the reject outlet (6) decreases. 2. Drucksortierer nach Anspruch 1 , dadurch gekennzeichnet, dass die Breite des Ringspaltes (12) in Stufen abnimmt. 2. pressure sorter according to claim 1, characterized in that the width of the annular gap (12) decreases in stages. 3. Drucksortierer nach Anspruch 1 , dadurch gekennzeichnet, dass die Breite des Ringspaltes (12) kontinuierlich abnimmt. 3. pressure sorter according to claim 1, characterized in that the width of the annular gap (12) decreases continuously. 4. Drucksortierer nach einem der vorhergehenden Ansprüche, dadurch 4. pressure sorter according to one of the preceding claims, characterized gekennzeichnet, dass die radiale Ausdehnung der Rotorflügel (9) vom  characterized in that the radial extent of the rotor blades (9) from Suspensionszulauf (5) zum Rejektauslauf (6) abnimmt.  Suspension feed (5) to Rejektauslauf (6) decreases. 5. Drucksortierer nach Anspruch 4, dadurch gekennzeichnet, dass die radiale 5. pressure sorter according to claim 4, characterized in that the radial Ausdehnung der Rotorflügel (9) in Stufen abnimmt. Expansion of the rotor blades (9) decreases in stages. 6. Drucksortierer nach Anspruch 4, dadurch gekennzeichnet, dass die radiale Ausdehnung der Rotorflügel (9) kontinuierlich abnimmt. 6. pressure sorter according to claim 4, characterized in that the radial extent of the rotor blades (9) decreases continuously. 7. Drucksortierer nach einem der vorhergehenden Ansprüche, dadurch 7. pressure sorter according to one of the preceding claims, characterized gekennzeichnet, dass der Rotor (8) in wenigstens einer Umfangsebene (1 1 ) zwischen den Rotorflügeln (9) zumindest eine Aussparung (13) aufweist.  characterized in that the rotor (8) in at least one circumferential plane (1 1) between the rotor blades (9) has at least one recess (13). 8. Drucksortierer nach einem der vorhergehenden Ansprüche, dadurch 8. pressure sorter according to one of the preceding claims, characterized gekennzeichnet, dass der Rotor (8) zumindest drei Umfangsebenen (1 1 ) mit Rotorflügeln (9) aufweist.  in that the rotor (8) has at least three circumferential planes (1 1) with rotor blades (9). 9. Drucksortierer nach einem der vorhergehenden Ansprüche, dadurch 9. pressure sorter according to one of the preceding claims, characterized gekennzeichnet, dass jede Umfangsebene (1 1 ) jeweils zwei Rotorflügel (9) besitzt.  characterized in that each circumferential plane (1 1) each has two rotor blades (9). 10. Drucksortierer nach einem der vorhergehenden Ansprüche, dadurch 10. pressure sorter according to one of the preceding claims, characterized gekennzeichnet, dass die Rotorflügel (9) benachbarter Umfangsebenen (1 1 ) in Umfangsrichtung versetzt zueinander angeordnet sind.  characterized in that the rotor blades (9) adjacent circumferential planes (1 1) are arranged offset in the circumferential direction to each other. 1 1 . Drucksortierer nach einem der vorhergehenden Ansprüche, dadurch 1 1. Pressure sorter according to one of the preceding claims, characterized gekennzeichnet, dass die Rotorflügel (9) die gleiche Form haben.  characterized in that the rotor blades (9) have the same shape. 12. Drucksortierer nach einem der vorhergehenden Ansprüche, dadurch 12. pressure sorter according to one of the preceding claims, characterized gekennzeichnet, dass die Rotationsachse (10) senkrecht steht.  characterized in that the axis of rotation (10) is vertical. 13. Drucksortierer nach einem der vorhergehenden Ansprüche, dadurch 13. pressure sorter according to one of the preceding claims, characterized gekennzeichnet, dass sich der Rotor (8) innerhalb des Siebelementes (2) befindet. characterized in that the rotor (8) is located within the sieve element (2). 14. Drucksortierer nach Anspruch 13, dadurch gekennzeichnet, dass das14. pressure sorter according to claim 13, characterized in that the Siebelement (2) zylindrisch und der Rotor (8) als zylindrische Trommel ausgebildet sind. Screen element (2) cylindrical and the rotor (8) are formed as a cylindrical drum. 15. Drucksortierer nach einem der vorhergehenden Ansprüche, dadurch 15. pressure sorter according to one of the preceding claims, characterized gekennzeichnet, dass der Suspensionszulauf (5) unter dem Rejektauslauf (6) angeordnet ist.  in that the suspension inlet (5) is arranged below 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

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

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

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DE102019125317A1 (en) * 2019-09-20 2021-03-25 Voith Patent Gmbh Cleaning process
CN117425530B (en) * 2022-04-21 2025-03-25 凯登百利可乐生有限公司 Rotor with forward-swept struts for pressure screen drums

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US9855585B2 (en) 2018-01-02
CN105473783A (en) 2016-04-06
US20160158804A1 (en) 2016-06-09
CN105473783B (en) 2018-02-06
EP3036371B1 (en) 2017-04-19
JP2016531215A (en) 2016-10-06
JP6377159B2 (en) 2018-08-22
WO2015024812A1 (en) 2015-02-26
DE102013216433A1 (en) 2015-03-12

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