EP0633416B1 - Dispositif et procédé pour l'étranglement d'un écoulement d'une suspension fluide sans obstruction - Google Patents

Dispositif et procédé pour l'étranglement d'un écoulement d'une suspension fluide sans obstruction Download PDF

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Publication number
EP0633416B1
EP0633416B1 EP94109147A EP94109147A EP0633416B1 EP 0633416 B1 EP0633416 B1 EP 0633416B1 EP 94109147 A EP94109147 A EP 94109147A EP 94109147 A EP94109147 A EP 94109147A EP 0633416 B1 EP0633416 B1 EP 0633416B1
Authority
EP
European Patent Office
Prior art keywords
valve
main flow
liquid
flow direction
hollow member
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
EP94109147A
Other languages
German (de)
English (en)
Other versions
EP0633416A1 (fr
Inventor
Ulrich Begemann
Helmut Heinzmann
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 DE4402516A external-priority patent/DE4402516C2/de
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Priority to EP96118580A priority Critical patent/EP0766031B1/fr
Publication of EP0633416A1 publication Critical patent/EP0633416A1/fr
Application granted granted Critical
Publication of EP0633416B1 publication Critical patent/EP0633416B1/fr
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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/022—Means for injecting material into flow within the headbox
    • 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
    • D21F1/06—Regulating pulp flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/02—Influencing flow of fluids in pipes or conduits

Definitions

  • the invention relates to a valve or throttle device according to the preamble of claim 1 and a method for reducing the tendency to blockage of a valve or a throttle device according to the preamble of claim 4.
  • Valves in a wide variety of designs are state of the art for throttling fluid flows.
  • Significant disadvantages of these valves, e.g. Ball valves, flap valves, needle valves and the like is that they produce relatively narrow cross sections to set a desired flow rate. It is known with such valves that cross-sections of this size tend to clog undesirably when flowing through stock suspension and produce fiber wipes - local fiber accumulations - and deposits when operated in paper machines.
  • the invention is based on the object of describing a valve or at least one throttle device in which the formation of fibers or the risk of clogging is avoided by suitable design.
  • the inventors have recognized that the tendency for clogging in a valve, in particular in the case of a valve type which corresponds to a needle valve, can be decisively reduced if a rotation component is added to the flow in the region of the narrowest point of the valve.
  • the rotation component dissolves any turbulence that may be present, and the resulting fiber wiping or fiber accumulation, which can then lead to blockages.
  • FIG. 1 shows a throttle device 1 according to the invention in cross section.
  • the throttle device consists of an essentially rotationally symmetrical cylindrical cavity with a constriction 3.
  • a fluid flow perpendicular to the axis of the cylindrical cavity is fed to the cavity via an eccentrically arranged radius-parallel feed 4.
  • the fluid flow S thus enters the cavity tangentially and is thereby deflected to the axial direction of the cavity. In this way, the flow S receives a spiral course within the cylindrical cavity.
  • a plunger 2 is axially mounted in this cavity, which in the present case is provided with an extension on the lower side, that is to say the side facing the throttling.
  • the plunger 2 is slidably provided in the axial direction, so that by axially moving this plunger a cross-sectional constriction similar to one Needle valve is effected.
  • the tangentially introduced flow causes sufficient flushing around the constriction, so that at this point no blockages can occur due to solids carried in the flow. This is particularly advantageous in the case of stock suspension flows in paper machines, in which such blockages, that is to say fiber wiping, can have very unfavorable effects on the quality of the paper produced.
  • FIG. 2 shows the section A-A through the throttle device from FIG. 1.
  • the above-described tangential feed of the flow S into the cylindrical interior of the throttle device is clearly shown.
  • the invention is of course not limited to a purely tangential supply of the flow into the throttling space of a throttling device.
  • FIG. 3 shows the application of the valve shown in FIGS. 1 and 2 using the example of the regulated supply of dilution water into the main flow of the stock suspension in a headbox.
  • Two cross distributors Q1 and Q2 are shown, the stock suspension being fed from the cross distributor Q1 in a slightly increased concentration via a main line H to the headbox STA.
  • a supply of dilution water into the main stream H is shown on the main line H at an angle unequal to 90 °.
  • the feed consists essentially of the throttle element 1 itself, the throttle element having the same design as the element shown in FIG. 1 and with its feed line being connected directly to the second cross distributor Q2, which carries the dilution water.
  • the correct choice of the angle between the main flow H and the secondary flow N supplied by the throttle device ensures that the sum of the suspension quantity led to the headbox remains constant irrespective of the flow quantity of the secondary flow N supplied.
  • the design of the throttling device 1 avoids any fiber wiping in the throttling device, so that there is no fear of quality losses in the paper produced.
  • the throttle device 1 is operated in such a way that an average amount of stock suspension is passed through the throttle device 1 at the normal operating point, as a result of which no settling processes of solids in the throttle device are possible.
  • the regulation of the consistency that is to say the concentration of the total suspension from the streams N and H, then takes place around this middle operating point, the sum of the total stream remaining constant and a very carefully metered control of the concentration being achieved by the design of the throttle device 1.

Claims (4)

  1. Dispositif de valve ou d'étranglement (1), dans une conduite d'acheminement d'une suspension de pâte à la caisse de tête d'une machine à papier, comportant les particularités suivantes :
    1.1 il est prévu un corps creux essentiellement à symétrie de révolution et traversé par un fluide,
    1.2 le corps creux comporte une surface de passage, essentiellement à symétrie de révolution, qui peut être modifiée,
    1.3 dans le corps creux, il est prévu une direction d'écoulement principal qui s'étend d'une manière essentiellement axiale vis-à-vis de l'axe longitudinal du corps creux,
    caractérisé par la particularité suivante :
       1.4 il est prévu une amenée de fluide à la surface de passage d'une façon telle que, rapporté à la direction d'écoulements principal, il est appliqué d'une manière superposée au fluide une composante de rotation autour de la direction d'écoulement principale.
  2. Dispositif selon la revendication 1, caractérisé en ce que l'acheminement au dispositif de valve est prévu tangentiellement dans l'espace cylindrique.
  3. Dispositif selon l'une des revendications 1 et 2, caractérisé en ce que les surfaces de la valve qui sont mouillées par le fluide sont pourvues, au moins partiellement, d'une structure qui provoque une rotation du fluide.
  4. Procédé permettant de réduire la tendance à se boucher d'une valve ou d'un dispositif d'étranglement, présentant une section transversale d'étranglement à symétrie de révolution, caractérisé en ce que, dans la zone de la section transversale d'étranglement, une composante de rotation vis-à-vis de la direction d'écoulement principal est appliquée d'une manière superposée au fluide.
EP94109147A 1993-07-05 1994-06-15 Dispositif et procédé pour l'étranglement d'un écoulement d'une suspension fluide sans obstruction Expired - Lifetime EP0633416B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96118580A EP0766031B1 (fr) 1993-07-05 1994-06-15 Dispositif et procédé pour l'étranglement d'un écoulement d'une suspension fluide sans obstruction

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4322321 1993-07-05
DE4322321 1993-07-05
DE4402516A DE4402516C2 (de) 1993-07-05 1994-01-28 Vorrichtung und Verfahren zur verstopfungsfreien Drosselung einer fluiden Suspensionsströmung
DE4402516 1994-01-28

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP96118580A Division EP0766031B1 (fr) 1993-07-05 1994-06-15 Dispositif et procédé pour l'étranglement d'un écoulement d'une suspension fluide sans obstruction
EP96118580.8 Division-Into 1996-11-20

Publications (2)

Publication Number Publication Date
EP0633416A1 EP0633416A1 (fr) 1995-01-11
EP0633416B1 true EP0633416B1 (fr) 1997-08-27

Family

ID=25927393

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94109147A Expired - Lifetime EP0633416B1 (fr) 1993-07-05 1994-06-15 Dispositif et procédé pour l'étranglement d'un écoulement d'une suspension fluide sans obstruction

Country Status (6)

Country Link
EP (1) EP0633416B1 (fr)
JP (1) JP2995712B2 (fr)
AT (2) ATE191266T1 (fr)
CA (1) CA2127408C (fr)
DE (1) DE9421889U1 (fr)
FI (1) FI102779B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009002792U1 (de) 2009-02-27 2009-04-30 Voith Patent Gmbh Ventilanordnung und Verteilereinheit zur Verteilung von Volumenströmen

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29811054U1 (de) * 1998-06-23 1998-09-17 Bellmer Geb Kg Maschf Suspensionsegalisator
DE102004039712B4 (de) * 2004-08-17 2006-06-14 Voith Paper Patent Gmbh Verfahren zum dosierten Transport einer störstoffhaltigen Suspension durch einen einstellbaren Drosselschieber
DE102009014268B3 (de) * 2009-03-20 2010-04-08 Andritz Küsters Gmbh Anordnung an Papiermaschinen zur Einstellung eines Flächengewichts-Querprofils
DE102010001555A1 (de) 2010-02-03 2011-08-04 Voith Patent GmbH, 89522 Ventil zum Regulieren eines Fluidstroms
DE102010001557A1 (de) 2010-02-03 2011-08-04 Voith Patent GmbH, 89522 Ventil zum Regulieren eines Fluidstroms
DE102010028404A1 (de) 2010-04-30 2011-11-03 Voith Patent Gmbh Ventil zum Regulieren eines Fluidstroms
DE102010028403A1 (de) 2010-04-30 2011-11-03 Voith Patent Gmbh Ventil zum Regulieren eines Fluidstroms
DE102010028408A1 (de) 2010-04-30 2011-11-03 Voith Patent Gmbh Ventil zum Regulieren eines Fluidstroms
DE102010038891A1 (de) 2010-08-04 2012-02-09 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
CN103836206A (zh) * 2014-02-20 2014-06-04 武汉汽轮发电机有限公司 新型汽轮发电机轴承用流量调节阀

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998244A (en) * 1975-08-08 1976-12-21 Clarence Bentley Drip irrigation valve with helical flow path
JPS6469869A (en) * 1987-09-10 1989-03-15 Nippon Brown Coal Liquefaction Valve for slurry
JPH07111035B2 (ja) * 1988-06-28 1995-11-29 日本製紙株式会社 抄紙機用ヘッドボックス

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009002792U1 (de) 2009-02-27 2009-04-30 Voith Patent Gmbh Ventilanordnung und Verteilereinheit zur Verteilung von Volumenströmen

Also Published As

Publication number Publication date
CA2127408C (fr) 2001-09-18
EP0633416A1 (fr) 1995-01-11
FI102779B1 (fi) 1999-02-15
FI943199A (fi) 1995-01-06
ATE191266T1 (de) 2000-04-15
JPH0881891A (ja) 1996-03-26
FI943199A0 (fi) 1994-07-04
FI102779B (fi) 1999-02-15
ATE157434T1 (de) 1997-09-15
CA2127408A1 (fr) 1995-01-06
DE9421889U1 (de) 1997-02-27
JP2995712B2 (ja) 1999-12-27

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