EP1116822B1 - Device for discharging water - Google Patents

Device for discharging water Download PDF

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Publication number
EP1116822B1
EP1116822B1 EP00128157A EP00128157A EP1116822B1 EP 1116822 B1 EP1116822 B1 EP 1116822B1 EP 00128157 A EP00128157 A EP 00128157A EP 00128157 A EP00128157 A EP 00128157A EP 1116822 B1 EP1116822 B1 EP 1116822B1
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EP
European Patent Office
Prior art keywords
chamber
water
discharging water
machine width
press
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.)
Expired - Lifetime
Application number
EP00128157A
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German (de)
French (fr)
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EP1116822A2 (en
EP1116822A3 (en
Inventor
Karl Dr. Steiner
Robert Wolf
Hans Prinzing
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Voith Patent GmbH
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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
Priority claimed from DE20000599U external-priority patent/DE20000599U1/en
Priority claimed from DE10014873A external-priority patent/DE10014873A1/en
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Priority to EP05108375A priority Critical patent/EP1619300B1/en
Publication of EP1116822A2 publication Critical patent/EP1116822A2/en
Publication of EP1116822A3 publication Critical patent/EP1116822A3/en
Application granted granted Critical
Publication of EP1116822B1 publication Critical patent/EP1116822B1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0272—Wet presses in combination with suction or blowing devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/07—Water collectors, e.g. save-alls

Definitions

  • the invention relates to a water discharge device for a paper machine or the like, in particular for a felted press of such a paper machine, with a collecting trough extending at least substantially over the machine width according to the preamble of claim 1.
  • Such a drainage device is for example off US-A-3355350 known.
  • a suction box for sucking water passing through a sieve has already become known, which is subdivided into a water suction chamber and an air suction chamber by a dividing wall provided with passages.
  • An object of the invention is to provide an improved water drainage device of the type mentioned, in which a reduction of the outflow cross section of the trough accompanied by a corresponding saving in space is possible without problems.
  • the two chambers are preferably connected to each other via a plurality of openings which are distributed over the machine width.
  • the water is discharged from the second chamber on at least one of the two sides of the machine.
  • the tubes suitably have a diameter of about 10 to about 100 mm.
  • the vacuum of the second chamber is advantageously less than about 0.2 bar, preferably less than or equal to about 0.05 bar.
  • the drip pan can be divided into segments across the machine width. However, it can also be carried out continuously over the machine width.
  • the water can, for example, be sucked out of the trough or gutter in a manner similar to that in drying cylinders or as the oil in NFP presses.
  • a small amount of air can be sucked with, for example, some 1 / s.
  • a pressure difference Dp 5000 N / m 2
  • a volume flow of V-air of substantially less than 0.5 m 3 / min can result.
  • FIGS. 1 to 9 each show in a purely schematic representation of a water discharge device 10 for a paper machine and the like, which can be used in particular for a felted press 12.
  • a water discharge device 10 for a paper machine and the like, which can be used in particular for a felted press 12.
  • a double-felted press cf. FIGS. 1 and 3
  • such a water discharge device 10 can be used in particular for the top felt.
  • Each of these drip pans 14 has a first chamber 18 which is under ambient pressure and which receives the incoming water 16 and a second chamber 20, which is acted upon by a vacuum and connected to the first chamber 20 which sucked the accumulating in the first chamber 18 water 16 and from which the water 16 is finally discharged.
  • At least one of the two chambers 18, 20 may extend at least substantially over the machine width.
  • the Wasserab fossil fuel 10 is associated with the upper felt 24 of a double-felted shoe press 12.
  • the connection openings 22 are provided in a lower area adjacent to the screen 24. Between the two chambers 18, 20, a partition wall 26 is provided, in which the openings 22 are left. Through these openings 22, the accumulating in the first chamber 18 water 16 enters the second chamber 20 acted upon with vacuum.
  • FIGS. 3 and 4 show a schematic representation of another embodiment of the water discharge device 10, in which the two chambers are connected to each other via a plurality of distributed over the machine width tubes 28.
  • These tubes 28 open at one end in each case in a respective connection opening 22 of the partition wall 26 and at its other end in the second chamber 20.
  • Wie in particular with reference to the FIG. 3 can be seen, the pipes in the region of the openings 22 are first led a little way into the second chamber 20 and then bent generally upward.
  • the upper pipe mouths are acted upon by the prevailing in the second chamber 20 vacuum, so that water is first sucked through the tubes 28 upwards and then flows in this chamber 20 down.
  • the water can be discharged laterally from the second chamber 20.
  • FIGS. 5 and 6 is shown in a schematic representation of another embodiment of a water discharge device 10 which is provided with the water 16 to the edge of the paper machine laxative pipes 30.
  • the second chamber 20 is bounded by a transversely extending, vacuum-loaded tube 32 in whose jacket the Openings 22 are provided, via which the first chamber 18 is connected to the second chamber 20 formed by the tube interior.
  • the speed of the spray water 16 is used similar to a Saugschnabelsiphon for water removal.
  • the water is sucked here again in the second chamber 20 and discharged via this.
  • the removal of water takes place via a suction pipe 34 through which the second chamber 20 is limited in the present case.
  • the jacket of the suction tube 34 is again provided with openings 22 through which the interior of the tube forming the second chamber 20 is connected to the first chamber 18.
  • the accumulating in the first chamber 18 water 16 is thus sucked through the openings 22 in the tube 20 and discharged via this.
  • the water discharge device 10 is assigned to a simply felted shoe press 12.
  • the Wasserabcultivated driving 10 is disposed in the outlet gusset between the felt 36 and the upper roller.

Abstract

The water disposal system (10) at a papermaking machine, and especially at the roller press section (12) with a press blanket where water is extracted from the wet web, has a catch trough (14) with an inner pressure which is lower than the ambient pressure. The extracted water (16) is held in an initial chamber (18), which is linked to a second vacuum chamber (20) so that the caught water is drawn out by suction, and led off for disposal. At least one of the two chambers (18,20) extends across the machine width, and they are linked together by throttled openings (22) which are distributed across the machine width. The water is removed from the vacuum chamber at one of the two machine sides. The mean water flow into the first catch chamber, which is the effective main flow, is free of lateral flow components. The mean water flow from the first chamber into the second, which is the effective main flow, has a lateral flow component across the machine width. The two water catch chambers can be linked together by a tube, with one end at a connecting opening in a dividing wall (26), and the other end opening into the second chamber, with a number of connecting tubes across the machine width and pref. 0.5-5.0 tubes with a dia. of 10-100 mm. The vacuum in the second chamber is ≤ 0.2 bar and pref. ≤ 0.05 bar. The vacuum is generated by a volumetric pump. The second chamber is defined by a lateral vacuum tube, with openings in its mantle to link its interior with the first chamber. The catch trough (14) is divided into segments across the machine width. An Independent claim is included for the press section of a papermaking/cardboard prodn. machine, with a water trap in the triangular gap between the upper press roller and the press blanket, to form a suction channel across the line of the web. The suction channel is linked to a vacuum supply. Preferred Features: The suction channel has a gap width, at least into the holding zone, of 1-50 mm and pref. 2-7 mm, with an under pressure of 50-80000 N/m<2> and pref. 10000-30000 N/m<2>. The suction channel leads to a collection vessel to hold the extracted water for disposal. The outlet opening from the suction channel lies over the max. water level in the collection vessel. The collection vessel has a connection for an underpressure supply, over the max. water level. The suction channel has an upper and a lower channel wall which taper at an acute angle towards the water extraction blanket. The edge of the lower channel wall is as close as possible to the water extraction blanket, with gap between them of ≤ 20 mm, or the edge of the lower channel wall is in contact with the blanket or presses into it slightly. The edge of the lower channel wall is formed by a low-wear bar pref. of a ceramic material, which forms an angle of 10-45 degrees with the blanket. The upper channel wall is part of the water catch assembly, for the water spun from the upper press roller at the suction channel. The upper surface of the upper channel wall, outside the suction channel, is aligned at an angle to the roller press gap, and the edge of the wall extends slightly less into the press gap than the lower channel wall. Or the upper channel wall edge has the same length into the press gap as the lower wall, or is slightly longer. The water collection vessel is divided into a number of chambers across the machine width, each with a connection to an underpressure supply.

Description

Die Erfindung betrifft eine Wasserabführeinrichtung für eine Papiermaschine oder dergleichen, insbesondere für eine befilzte Presse einer solchen Papiermaschine, mit einer sich zumindest im wesentlichen über die Maschinenbreite erstreckenden Auffangwanne nach dem Oberbegriff des Anspruchs 1.The invention relates to a water discharge device for a paper machine or the like, in particular for a felted press of such a paper machine, with a collecting trough extending at least substantially over the machine width according to the preamble of claim 1.

Eine derartige Wasserabführeinrichtung ist beispielsweise aus US-A-3355350 bekannt.Such a drainage device is for example off US-A-3355350 known.

Bei den bisher üblichen Wasserabführeinrichtungen der eingangs genannten Art wird das Presswasser in der Regel durch Schwerkraft abgeführt. Insbesondere bei einer Verwendung für einen Oberfilz kann die in die Wanne abgeschleuderte Wassermenge nicht in jedem Fall seitlich durch die Schwerkraft zum Wannenrand strömen. Insbesondere dann, wenn der Abflussquerschnitt der Wanne zu klein ist und/oder die Wanne keine ausreichende Neigung besitzt, kann Wasser auf den Filz zurückfließen.In the usual water drainage devices of the type mentioned, the press water is usually removed by gravity. In particular, when used for an upper felt, the amount of water thrown off into the tub can not in each case flow laterally by gravity to the edge of the tub. In particular, if the outflow cross section of the tub is too small and / or the tub does not have a sufficient inclination, water can flow back to the felt.

Aus der DE 25 09 057 C3 ist bereits ein Saugkasten zum Absaugen von durch ein Sieb hindurchtretendes Wasser bekannt geworden, der durch eine mit Durchtrittsöffnungen versehene Trennwand in eine Wassersaugkammer und eine Luftsaugkammer unterteilt ist.From the DE 25 09 057 C3 A suction box for sucking water passing through a sieve has already become known, which is subdivided into a water suction chamber and an air suction chamber by a dividing wall provided with passages.

Ein Ziel der Erfindung ist es, eine verbesserte Wasserabführeinrichtung der eingangs genannten Art zu schaffen, bei der problemlos eine mit einer entsprechenden Platzersparnis einhergehende Verringerung des Abflussquerschnitts der Wanne möglich ist. Zudem soll ausgeschlossen sein, dass Wasser auf den Filz zurückfließt. Weiterhin soll es auch möglich sein, bei einem nur sehr geringen Gefälle in Querrichtung die anfallende Wassermenge problemlos abzuführen.An object of the invention is to provide an improved water drainage device of the type mentioned, in which a reduction of the outflow cross section of the trough accompanied by a corresponding saving in space is possible without problems. In addition, it should be ruled out that water flows back to the felt. Furthermore, it should also be possible to easily dissipate the accumulating amount of water with only a very small slope in the transverse direction.

Diese Aufgabe wird nach der Erfindung durch die Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention by the features of claim 1.

Die erfindungsgemäße Wasserabführeinrichtung ist mit besonderem Vorteil für eine der Entwässerung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn, dienende, wenigstens einen in Bahnlaufrichtung verlängerten Preßspalt aufweisende Pressenanordnung verwendbar, nachdem bei einem verlängerten Pressspalt einem erhöhten Wasseranfall Rechnung getragen werden muß.The water removal device according to the invention is particularly advantageous for a dewatering of a fibrous web, in particular a paper or board web, serving, at least one extended in the web running direction press nip having press assembly usable after an extended nip an increased water supply must be taken into account.

Vorteilhafterweise erstreckt sich zumindest eine der beiden Kammern zumindest im wesentlichen über die ganze Maschinenbreite.Advantageously, at least one of the two chambers extends at least substantially over the entire machine width.

Die beiden Kammern sind vorzugsweise über mehrere Öffnungen miteinander verbunden, die über die Maschinenbreite verteilt sind.The two chambers are preferably connected to each other via a plurality of openings which are distributed over the machine width.

Von Vorteil ist auch, wenn das Wasser auf wenigstens einer der beiden Maschinenseiten aus der zweiten Kammer abgeführt wird.It is also advantageous if the water is discharged from the second chamber on at least one of the two sides of the machine.

Bei einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Wasserabführeinrichtung sind die beiden Kammern über drosselnde Öffnungen miteinander verbunden.In a preferred practical embodiment of the invention Wasserabführeinrichtung the two chambers are connected via throttling openings with each other.

Die mittlere Strömungsrichtung, d.h. die effektive Hauptströmungsrichtung der in der ersten Kammer vorherrschenden Wasserströmung kann zumindest im wesentlichen querströmungsfrei sein.The mean flow direction, i. the effective main flow direction of the water flow prevailing in the first chamber may be at least substantially transversal free.

Dagegen kann die mittlere Strömungsrichtung, d.h. die effektive Hauptströmungsrichtung der in der zweiten Kammer vorherrschenden Wasserströmung eine in Richtung der Maschinenbreite verlaufende Querkomponente besitzen.In contrast, the mean flow direction, i. the effective main flow direction of the water flow prevailing in the second chamber has a transverse component extending in the machine width direction.

Bei einer zweckmäßigen praktischen Ausführungsform sind die beiden Kammern über wenigstens ein Rohr miteinander verbunden, das mit einem Ende in einer jeweiligen Verbindungsöffnung in einer zwischen den Kammern vorgesehenen Trennwand und mit seinem anderen Ende in die zweite Kammer mündet. Dabei sind vorzugsweise mehrere über die Maschinenbreite verteilte Rohre vorgesehen. Es können beispielsweise 0,5 bis 5 Rohre je Meter vorgesehen sein.In an expedient practical embodiment, the two chambers are connected to each other via at least one tube having one end in a respective connection opening in a partition wall provided between the chambers and with his other end opens into the second chamber. In this case, a plurality of tubes distributed over the machine width are preferably provided. For example, 0.5 to 5 tubes per meter may be provided.

Die Rohre besitzen zweckmäßigerweise einen Durchmesser von etwa 10 bis etwa 100 mm.The tubes suitably have a diameter of about 10 to about 100 mm.

Das Vakuum der zweiten Kammer ist vorteilhafterweise kleiner als etwa 0,2 bar, wobei es vorzugsweise kleiner oder gleich etwa 0,05 bar ist.The vacuum of the second chamber is advantageously less than about 0.2 bar, preferably less than or equal to about 0.05 bar.

Bei einer weiteren praktischen Ausführungsform der erfindungsgemäßen Wasserabführeinrichtung ist die zweite Kammer durch ein sich in Querrichtung erstreckendes, mit Vakuum beaufschlagtes Rohr begrenzt, dessen Mantel mit Öffnungen versehen ist, über die die erste Kammer mit der durch den Rohrinnenraum gebildeten zweiten Kammer verbunden ist.In a further practical embodiment of the invention Wasserabführeinrichtung the second chamber is bounded by a transversely extending, vacuum-loaded tube whose jacket is provided with openings through which the first chamber is connected to the second chamber formed by the tube interior.

Die Auffangwanne kann über die Maschinenbreite in Segmente unterteilt sein. Sie kann jedoch auch über die Maschinenbreite durchgehend ausgeführt sein.The drip pan can be divided into segments across the machine width. However, it can also be carried out continuously over the machine width.

Das in der zweiten Kammer vorherrschende Vakuum ist vorzugsweise durch eine volumetrische Pumpe erzeugt.The prevailing vacuum in the second chamber is preferably generated by a volumetric pump.

Das Wasser kann beispielsweise ähnlich wie in Trockenzylindern oder wie das Öl in NFP-Pressen aus der Wanne oder Rinne abgesaugt werden.The water can, for example, be sucked out of the trough or gutter in a manner similar to that in drying cylinders or as the oil in NFP presses.

Durch die Absaugöffnungen kann eine geringe Luftmenge mit abgesaugt werden, z.B. einige 1/s. So kann sich beispielsweise bei einem Durchmesser der Absaugöffnungen D = 5 mm, einer Druckdifferenz Dp = 5000 N/m2 ein Volumenstrom V-Luft von wesentlich weniger als 0,5 m3/min ergeben.Through the suction, a small amount of air can be sucked with, for example, some 1 / s. Thus, for example, with a diameter of the suction openings D = 5 mm, a pressure difference Dp = 5000 N / m 2, a volume flow of V-air of substantially less than 0.5 m 3 / min can result.

Die erfindungsgemäße Wasserabführeinrichtung ist vorteilhafterweise bei einer befilzten, insbesondere einer einfach oder doppelt befilzten Presse und insbesondere für eine wenigstens einen Langspalt aufweisende Pressenanordnung anwendbar.The water discharge device according to the invention is advantageously applicable to a felted, in particular a single or double felted press and in particular for a press arrangement having at least one extended nip.

Der Einsatz der Wasseraufnahmevorrichtung ist bei den unterschiedlichsten Pressanordnungen möglich. Beispielsweise kann auch unter der Faserstoffbahn ein Entwässerungsband durch den Pressspalt verlaufen und der Pressspalt durch den Einsatz einer Schuhpresswalze verlängert ausgeführt werden.The use of the water collecting device is possible in a variety of pressing arrangements. For example, under the fibrous web, a dewatering belt run through the press nip and run the press nip extended by the use of a shoe press roll.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:

Figur 1
eine schematische Darstellung einer dem Oberfilz einer doppelt befilzten Presse zugeordneten Wasserabführeinrichtung,
Figur 2
eine vergrößerte Darstellung der in der Figur 1 gezeigten Wasserabführeinrichtung,
Figur 3
eine schematische Darstellung einer weiteren Ausführungsform einer Wasserabführeinrichtung mit die beiden Kammern miteinander verbindenden Rohren,
Figur 4
eine schematische Teilquerschnittsdarstellung der in der Figur 3 gezeigten Wasserabführeinrichtung, geschnitten entlang der Linie I-I der Figur 3,
Figur 5
eine schematische Darstellung einer weiteren Ausführungsform einer Wasserabführeinrichtung mit das Wasser zum Rand der Papiermaschine abführenden Rohren,
Figur 6
eine schematische Teilquerschnittsdarstellung der in der Figur 5 gezeigten Wasserabführeinrichtung, geschnitten entlang der Linie I-I der Figur 5,
Figur 7
eine schematische Darstellung einer weiteren Ausführungsform einer Wasserabführeinrichtung, bei der die zweite Kammer durch ein sich in Querrichtung erstreckendes Rohr begrenzt ist,
Figur 8
eine schematische Darstellung einer weiteren Ausführungsform einer Wasserabführeinrichtung, bei der die Geschwindigkeit des Spritzwassers ähnlich wie bei einem Saugschnabelsiphon zur Wasserabfuhr genutzt wird,
Figur 9
eine schematische Darstellung einer weiteren Ausführungsform einer Wasserabführeinrichtung, bei der die Wasserabfuhr über ein Saugrohr erfolgt, und
The invention is explained in more detail below with reference to embodiments with reference to the drawing; in this show:
FIG. 1
a schematic representation of a top felt of a double-felted press associated Wasserabführeinrichtung,
FIG. 2
an enlarged view of the in the FIG. 1 shown water drainage device,
FIG. 3
a schematic representation of another embodiment of a water discharge device with the two chambers interconnecting pipes,
FIG. 4
a schematic partial cross-sectional view of the in the FIG. 3 shown Wasserabführeinrichtung, taken along the line II of FIG. 3 .
FIG. 5
a schematic representation of another embodiment of a water discharge device with the water to the edge of the paper machine laxative pipes,
FIG. 6
a schematic partial cross-sectional view of the in the FIG. 5 shown Wasserabführeinrichtung, taken along the line II of FIG. 5 .
FIG. 7
a schematic representation of another embodiment of a water discharge device, wherein the second chamber is defined by a transversely extending tube,
FIG. 8
a schematic representation of another embodiment of a water discharge device, in which the speed of the spray water is used similar to a Saugschnabelsiphon for water removal,
FIG. 9
a schematic representation of another embodiment of a water discharge, in which the removal of water via a suction pipe, and

Die Figuren 1 bis 9 zeigen jeweils in rein schematischer Darstellung eine Wasserabführeinrichtung 10 für eine Papiermaschine und dergleichen, die insbesondere für eine befilzte Presse 12 eingesetzt werden kann. Im Fall einer doppelt befilzten Presse (vgl. z.B. die Figuren 1 und 3) ist eine solche Wasserabführeinrichtung 10 insbesondere für den Oberfilz einsetzbar.The FIGS. 1 to 9 each show in a purely schematic representation of a water discharge device 10 for a paper machine and the like, which can be used in particular for a felted press 12. In the case of a double-felted press (cf. FIGS. 1 and 3 ), such a water discharge device 10 can be used in particular for the top felt.

Die Wasserabführeinrichtung 10 umfasst jeweils eine sich zumindest im wesentlichen über die Maschinenbreite erstreckende Auffangwanne 14. Diese Auffangwanne 14 besitzt jeweils eine unter Umgebungsdruck stehende, das ankommende Wasser 16 aufnehmende erste Kammer 18 und eine mit Vakuum beaufschlagte, mit der ersten verbundene zweite Kammer 20, in die das sich in der ersten Kammer 18 ansammelnde Wasser 16 gesaugt und aus der das Wasser 16 schließlich abgeführt wird.Each of these drip pans 14 has a first chamber 18 which is under ambient pressure and which receives the incoming water 16 and a second chamber 20, which is acted upon by a vacuum and connected to the first chamber 20 which sucked the accumulating in the first chamber 18 water 16 and from which the water 16 is finally discharged.

Zumindest eine der beiden Kammern 18, 20 kann sich zumindest im wesentlichen über die Maschinenbreite erstrecken.At least one of the two chambers 18, 20 may extend at least substantially over the machine width.

Die beiden Kammern 18, 20 können über Öffnungen 22 miteinander verbunden sein, die über die Maschinenbreite verteilt sind. Das Wasser kann auf wenigstens einer der beiden Maschinenseiten aus der zweiten Kammer 20 abgeführt werden. Bei den Öffnungen 22 kann es sich beispielsweise um drosselnde Öffnungen handeln.The two chambers 18, 20 may be interconnected via openings 22 which are distributed over the machine width. The water can be removed from the second chamber 20 on at least one of the two sides of the machine. The openings 22 may be, for example, throttling openings.

Beispielsweise beim in den Figuren 1 und 2 dargestellten Ausführungsbeispiel ist die Wasserabführeinrichtung 10 dem oberen Filz 24 einer doppelt befilzten Schuhpresse 12 zugeordnet. Die Verbindungsöffnungen 22 sind in einem unteren, dem Sieb 24 benachbarten Bereich vorgesehen. Zwischen den beiden Kammern 18, 20 ist eine Trennwand 26 vorgesehen, in der die Öffnungen 22 belassen sind. Durch diese Öffnungen 22 gelangt das sich in der ersten Kammer 18 ansammelnde Wasser 16 in die mit Vakuum beaufschlagte zweite Kammer 20.For example, in the Figures 1 and 2 illustrated embodiment, the Wasserabführeinrichtung 10 is associated with the upper felt 24 of a double-felted shoe press 12. The connection openings 22 are provided in a lower area adjacent to the screen 24. Between the two chambers 18, 20, a partition wall 26 is provided, in which the openings 22 are left. Through these openings 22, the accumulating in the first chamber 18 water 16 enters the second chamber 20 acted upon with vacuum.

Die Figuren 3 und 4 zeigen in schematischer Darstellung eine weitere Ausführungsform der Wasserabführeinrichtung 10, bei der die beiden Kammern über mehrere über die Maschinenbreite verteilte Rohre 28 miteinander verbunden sind. Diese Rohre 28 münden mit einem Ende jeweils in einer jeweiligen Verbindungsöffnung 22 der Trennwand 26 und mit ihrem anderen Ende in der zweiten Kammer 20. Wie insbesondere anhand der Figur 3 zu erkennen ist, sind die Rohre im Bereich der Öffnungen 22 zunächst ein Stück weit in die zweite Kammer 20 geführt und anschließend allgemein nach oben abgebogen. Die oberen Rohrmündungen sind von dem in der zweiten Kammer 20 vorherrschenden Vakuum beaufschlagt, so dass Wasser durch die Rohre 28 hindurch zunächst nach oben gesaugt wird und anschließend in dieser Kammer 20 nach unten fließt.The FIGS. 3 and 4 show a schematic representation of another embodiment of the water discharge device 10, in which the two chambers are connected to each other via a plurality of distributed over the machine width tubes 28. These tubes 28 open at one end in each case in a respective connection opening 22 of the partition wall 26 and at its other end in the second chamber 20. Wie in particular with reference to the FIG. 3 can be seen, the pipes in the region of the openings 22 are first led a little way into the second chamber 20 and then bent generally upward. The upper pipe mouths are acted upon by the prevailing in the second chamber 20 vacuum, so that water is first sucked through the tubes 28 upwards and then flows in this chamber 20 down.

Wie insbesondere anhand der Figur 4 zu erkennen ist, kann das Wasser seitlich aus der zweiten Kammer 20 abgeführt werden.As in particular on the basis of FIG. 4 can be seen, the water can be discharged laterally from the second chamber 20.

In den Figuren 5 und 6 ist in schematischer Darstellung eine weitere Ausführungsform einer Wasserabführeinrichtung 10 gezeigt, die mit das Wasser 16 zum Rand der Papiermaschine abführenden Rohren 30 versehen ist.In the FIGS. 5 and 6 is shown in a schematic representation of another embodiment of a water discharge device 10 which is provided with the water 16 to the edge of the paper machine laxative pipes 30.

Bei der Ausführungsform gemäß Figur 7 ist die zweite Kammer 20 durch ein sich in Querrichtung erstreckendes, mit Vakuum beaufschlagtes Rohr 32 begrenzt, in dessen Mantel die Öffnungen 22 vorgesehen sind, über die die erste Kammer 18 mit der durch den Rohrinnenraum gebildeten zweiten Kammer 20 verbunden ist.In the embodiment according to FIG. 7 the second chamber 20 is bounded by a transversely extending, vacuum-loaded tube 32 in whose jacket the Openings 22 are provided, via which the first chamber 18 is connected to the second chamber 20 formed by the tube interior.

Bei der in der Figur 8 dargestellten Ausführungsform wird die Geschwindigkeit des Spritzwassers 16 ähnlich wie bei einem Saugschnabelsiphon zur Wasserabfuhr genutzt. Das Wasser wird auch hier wieder in die zweite Kammer 20 gesaugt und über diese abgeführt.When in the FIG. 8 illustrated embodiment, the speed of the spray water 16 is used similar to a Saugschnabelsiphon for water removal. The water is sucked here again in the second chamber 20 and discharged via this.

Im vorliegenden Fall ist die Wasserabführeinrichtung wieder dem oberen Filz 24 einer doppelt befilzten Presse zugeordnet.In the present case, the Wasserabführeinrichtung is again associated with the upper felt 24 of a double-felted press.

Bei der in der Figur 9 dargestellten Ausführungsform erfolgt die Wasserabfuhr über ein Saugrohr 34, durch das im vorliegenden Fall die zweite Kammer 20 begrenzt wird. Der Mantel des Saugrohres 34 ist wieder mit Öffnungen 22 versehen, über die der die zweite Kammer 20 bildende Innenraum des Rohres mit der ersten Kammer 18 verbunden ist. Das sich in der ersten Kammer 18 ansammelnde Wasser 16 wird somit über die Öffnungen 22 in das Rohr 20 gesaugt und über dieses abgeführt.When in the FIG. 9 illustrated embodiment, the removal of water takes place via a suction pipe 34 through which the second chamber 20 is limited in the present case. The jacket of the suction tube 34 is again provided with openings 22 through which the interior of the tube forming the second chamber 20 is connected to the first chamber 18. The accumulating in the first chamber 18 water 16 is thus sucked through the openings 22 in the tube 20 and discharged via this.

Im vorliegenden Fall ist die Wasserabführeinrichtung 10 einer einfach befilzten Schuhpresse 12 zugeordnet. Dabei ist die Wasserabführeinrichtung 10 im Auslaufzwickel zwischen dem Filz 36 und der oberen Walze angeordnet.In the present case, the water discharge device 10 is assigned to a simply felted shoe press 12. In this case, the Wasserabführeinrichtung 10 is disposed in the outlet gusset between the felt 36 and the upper roller.

Claims (17)

  1. Device (10) for discharging water for a papermaking machine or the like, in particular for a felted press (12) of such a papermaking machine, having a collecting trough (14) extending at least substantially over the machine width, the collecting trough (14) comprising a first chamber (18), which is at ambient pressure and picks up the incoming water (16), and a second chamber (20), to which vacuum can be applied, which is connected to the first and into which the water accumulating in the first chamber (18) is sucked and from which the water is finally discharged, characterized in that the water level in the second chamber (20) lies above the water level of the first chamber (18).
  2. Device for discharging water according to Claim 1, characterized in that at least one of the two chambers (18, 20) extends at least substantially over the machine width.
  3. Device for discharging water according to Claim 1 or 2, characterized in that the two chambers (18, 20) are connected to each other by openings (22) which are distributed across the machine width.
  4. Device for discharging water according to one of the preceding claims, characterized in that the water is discharged from the second chamber (20) on at least one of the two machine sides.
  5. Device for discharging water according to one of the preceding claims, characterized in that the two chambers (18, 20) are connected to each other via restricting openings (22).
  6. Device for discharging water according to one of the preceding claims, characterized in that the average flow direction, that is to say the effective main flow direction, of the water flow prevailing in the first chamber (18) is at least substantially free of transverse flows.
  7. Device for discharging water according to one of the preceding claims, characterized in that the average flow direction, that is to say the effective main flow direction, of the water flow prevailing in the second chamber (20) has a transverse component running in the direction of the machine width.
  8. Device for discharging water according to one of the preceding claims, characterized in that the two chambers (18, 20) are interconnected by at least one pipe (28), which at one end opens into a respective connecting opening (22) in a dividing wall (26) provided between the chambers (18, 20), and at its other end opens into the second chamber (20).
  9. Device for discharging water according to Claim 8, characterized in that a plurality of pipes (28) distributed over the machine width are provided.
  10. Device for discharging water according to Claim 9, characterized in that about 0.5 to 5 pipes (28) per metre are provided.
  11. Device for discharging water according to one of Claims 8 to 10, characterized in that the pipes (28) have a diameter of about 10 to about 100 mm.
  12. Device for discharging water according to one of the preceding claims, characterized in that the vacuum in the second chamber (20) is less than about 0.2 bar and preferably less than or equal to about 0.05 bar.
  13. Device for discharging water according to one of the preceding claims, characterized in that the second chamber (20) is delimited by a pipe (32) which extends in the transverse direction, to which vacuum can be applied and whose circumference is provided with openings (22), via which the first chamber (18) is connected to the second chamber (20) formed by the interior of the pipe.
  14. Device for discharging water as claimed in one of the preceding claims, characterized in that the collecting trough (14) is subdivided into segments over the machine width.
  15. Device for discharging water as claimed in one of Claims 1 to 13, characterized in that the collecting trough (14) is designed to be continuous over the machine width.
  16. Device for discharging water as claimed in one of the preceding claims, characterized in that the vacuum prevailing in the second chamber (20) is produced by a volumetric pump.
  17. Use of the device for discharging water according to one of the preceding claims for a press arrangement serving to dewater a fibrous web, in particular a paper or board web, and having at least one press nip extended in the web running direction.
EP00128157A 2000-01-14 2000-12-21 Device for discharging water Expired - Lifetime EP1116822B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05108375A EP1619300B1 (en) 2000-01-14 2000-12-21 Pressing arrangement

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE20000599U 2000-01-14
DE20000599U DE20000599U1 (en) 2000-01-14 2000-01-14 Water drainage device
DE10014873 2000-03-24
DE10014873A DE10014873A1 (en) 2000-01-14 2000-03-24 Web roller press station has a water extraction system with a suction channel aligned at the press blanket to pick up extracted water to be passed to a collection vessel for disposal

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP05108375A Division EP1619300B1 (en) 2000-01-14 2000-12-21 Pressing arrangement

Publications (3)

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EP1116822A2 EP1116822A2 (en) 2001-07-18
EP1116822A3 EP1116822A3 (en) 2002-07-31
EP1116822B1 true EP1116822B1 (en) 2008-02-13

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AT (2) ATE386153T1 (en)
DE (2) DE50014738D1 (en)

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Also Published As

Publication number Publication date
ATE376604T1 (en) 2007-11-15
US20010010259A1 (en) 2001-08-02
EP1116822A2 (en) 2001-07-18
ATE386153T1 (en) 2008-03-15
US20040173332A1 (en) 2004-09-09
US6716315B2 (en) 2004-04-06
US7189309B2 (en) 2007-03-13
DE50014962D1 (en) 2008-03-27
EP1116822A3 (en) 2002-07-31
DE50014738D1 (en) 2007-12-06

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