EP2580391B1 - Saugvorrichtung für einen pressfilz - Google Patents

Saugvorrichtung für einen pressfilz Download PDF

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Publication number
EP2580391B1
EP2580391B1 EP11774065.4A EP11774065A EP2580391B1 EP 2580391 B1 EP2580391 B1 EP 2580391B1 EP 11774065 A EP11774065 A EP 11774065A EP 2580391 B1 EP2580391 B1 EP 2580391B1
Authority
EP
European Patent Office
Prior art keywords
tubular body
suction
felt
suction device
press felt
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.)
Not-in-force
Application number
EP11774065.4A
Other languages
English (en)
French (fr)
Other versions
EP2580391A1 (de
Inventor
Aki Valtonen
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.)
Valmet Technologies Oy
Original Assignee
Valmet Technologies Oy
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
Application filed by Valmet Technologies Oy filed Critical Valmet Technologies Oy
Publication of EP2580391A1 publication Critical patent/EP2580391A1/de
Application granted granted Critical
Publication of EP2580391B1 publication Critical patent/EP2580391B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • D21F1/52—Suction boxes without rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/12—Drying
    • 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
    • D21F1/32—Washing wire-cloths or felts
    • 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

Definitions

  • the present invention is directed to a so called felt suction device that is used for removing water from a press felt of a pulp dryer machine, paper machine and cardboard machine, and for cleaning the felt.
  • a felt suction device is usually a tubular construction located in a suitable place in the felt circulation, in transversal direction across the felt.
  • the inside of the hollow tube construction is connected to a vacuum system, which keeps the inside of the tube under a vacuum.
  • a slot construction Through a slot construction, the vacuum effects on the felt that travels over the felt suction device, said slot construction extending over the total length of the suction device. Slot constructions equipped with different wear strip arrangements and adjusting devices are known. A significant amount of air and water travels through the felt to the suction device, taking along impurities gathered in the felt.
  • An object of the present invention is to simplify the construction of the felt suction equipment to be less space-taking. With a simplified construction, it can operate without needing any devices to be located between the felt suction device and the vacuum device, in addition to the necessary pipe fittings.
  • the basic object of the invention can be achieved with a felt suction device comprising, as known, a tubular body extending in transversal direction of the felt web and being equipped with a suction slot arrangement extending over the length of the body in contact with the felt, having the inside connected with a exhaust suction apparatus.
  • the suction device further comprises deflection plates for deflecting the direction of the suction flow at the points of the air exhaust connections of the tubular body.
  • the felt suction device of Figure 1 comprises a basic body 1, which is in a usual way, a hollow tubular or corresponding construction.
  • the inside of the tube is in connection with a vacuum producing device in a way described in further detail later.
  • a suction slot construction 2 is located onto the upper surface of the tube extending over the total length thereof, a press felt 3 travelling over it and being exposed to vacuum maintained in the tube 1.
  • Suction slot arrangements are known having many different implementations and being equipped with different wear strip solutions.
  • the inside of the tubular body is in connection with the vacuum producing device through an exhaust tube, having an outlet located at the end of the tube body.
  • the tube body has two exhaust connections 4 located at a distance from each other over the length of the tubular body, and in addition, a drainage connection 5.
  • the outlet of the drainage connection 5 is located in the tubular body1 below the exhaust connections 4.
  • a target of this construction is to cause the flow that is sucked from the felt 3 and containing water and air, to separate in the tubular body, so that only water is removed from the drainage connection 5 and mainly air is removed from the exhaust connections 4.
  • the locating of the exhaust connections 4 is essential, in other words, their distribution over the length of the felt suction tube 1 so that the volume flow coming through the suction slot 2 and growing towards the exhaust connections 4 is limited so that the flow rate in the suction tube will be limited to an area, where water is separated from the air during the time, when the flow travels inside the suction tube.
  • a target value has been discovered to be a flow rate of abt. 2 - 4 m/s or less.
  • the felt suction tube implemented with usual operation values in a pulp drying machine having a machine width of 10 m, can be dimensioned to have a diameter of 500 mm, in the case that, in addition to a water draining connection, there are two air exhaust connections connected to the vacuum producing device, evenly distributed over the length of the felt suction tube and located having the outlet above the draining connection. With three air exhaust connections 4 correspondingly arranged and connected to the vacuum producing device, the tubular body 1 of the felt suction device can be implemented with a diameter of about 400 mm.
  • the tubular body 1 can have deflection plates 6 for facilitating the separating of the air and water.
  • the deflection plates must not have an increasing influence on the general flow rate prevailing in the tube.
  • the air removed through the exhaust connections 4 from the tubular body 1 can be led outside the paper machine with a discharge pipe located beside the tubular body 1, in the felt circulation. Some water separation from the air flow can still be effected in this discharge pipe, and the separated water can be drained for example through a connection located in the lower part of the pipe, or by leading the pipe so that the possibly separated water flows back to the suction device.

Claims (3)

  1. Saugvorrichtung für einen Pressfilz, wobei die Saugvorrichtung einen rohrförmigen Körper (1) aufweist, der sich in transversaler Richtung bezüglich einer Filzgewebebahn (3) erstreckt und mit einer Saugschlitzanordnung (2) versehen ist, die sich entlang der gesamten Länge des Körpers erstreckt und in Kontakt mit dem Filz ist, wobei das Innere des rohrförmigen Körpers über zwei oder mehr ins Innere des rohrförmigen Körpers führende Rohranschlüsse (4), die entlang der Länge des rohrförmigen Körpers und in einem Abstand voneinander angeordnet sind, mit einer Absaugvorrichtung verbunden ist, so dass die Absaugung ins Innere des rohrförmigen Körpers (1) gerichtet ist, wobei der rohrförmige Körper mindestens einen Drainageanschluss (5) aufweist, der tiefer als die zwei oder mehr Rohranschlüsse (4) angeordnet ist, wobei die Saugvorrichtung ferner Ablenkplatten (6) zum Ablenken der Richtung des Saugstroms aufweist, dadurch gekennzeichnet, dass die Stromablenkplatten (6) im Inneren des rohrförmigen Körpers (1) im Auslassbereich der Rohranschlüsse (4) angeordnet sind.
  2. Saugvorrichtung für einen Pressfilz nach Anspruch 1, dadurch gekennzeichnet, dass die Rohranschlüsse (4) entlang der Länge des rohrförmigen Körpers (1) in einem gleichmäßigen Abstand voneinander angeordnet sind.
  3. Saugvorrichtung für einen Pressfilz nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Absaugung zum Inneren des rohrförmigen Körpers (1) gerichtet ist, um die lokale maximale Strömungsrate in dem Innenraum des rohrförmigen Körpers auf einen Wert von ungefähr 2 bis 4m/s zu begrenzen.
EP11774065.4A 2010-06-08 2011-06-06 Saugvorrichtung für einen pressfilz Not-in-force EP2580391B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20105652A FI122422B (fi) 2010-06-08 2010-06-08 Puristinhuovan imuri
PCT/FI2011/050524 WO2011154598A1 (en) 2010-06-08 2011-06-06 Suction device of a press felt

Publications (2)

Publication Number Publication Date
EP2580391A1 EP2580391A1 (de) 2013-04-17
EP2580391B1 true EP2580391B1 (de) 2015-10-07

Family

ID=42308108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11774065.4A Not-in-force EP2580391B1 (de) 2010-06-08 2011-06-06 Saugvorrichtung für einen pressfilz

Country Status (4)

Country Link
EP (1) EP2580391B1 (de)
CN (1) CN102933766A (de)
FI (1) FI122422B (de)
WO (1) WO2011154598A1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL288330A (de) * 1962-06-13
US4329201A (en) * 1979-12-06 1982-05-11 Albany International Corp. Constant vacuum felt dewatering system
US4308077A (en) * 1979-12-06 1981-12-29 Albany International Corp. Constant flow felt dewatering system
GB8305098D0 (en) * 1983-02-24 1983-03-30 Beloit Walmsley Ltd Doctoring mechanisms
US5851358A (en) * 1997-04-08 1998-12-22 Voith Sulzer Paper Technology North America, Inc. Paper making machine with an integral suction chamber and air/water separator for a doctor element
DE19940980A1 (de) * 1999-08-28 2001-03-01 Voith Paper Patent Gmbh Vorrichtung zum Reinigen eines maschinenbreiten Ablaufzwickels in einer Papier- oder Kartonherstellungsmaschine

Also Published As

Publication number Publication date
FI122422B (fi) 2012-01-13
EP2580391A1 (de) 2013-04-17
FI20105652A (fi) 2011-12-09
WO2011154598A1 (en) 2011-12-15
FI20105652A0 (fi) 2010-06-08
CN102933766A (zh) 2013-02-13

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