EP0331883B1 - Epurateur sous pression trieur de noeuds - Google Patents

Epurateur sous pression trieur de noeuds Download PDF

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Publication number
EP0331883B1
EP0331883B1 EP89100830A EP89100830A EP0331883B1 EP 0331883 B1 EP0331883 B1 EP 0331883B1 EP 89100830 A EP89100830 A EP 89100830A EP 89100830 A EP89100830 A EP 89100830A EP 0331883 B1 EP0331883 B1 EP 0331883B1
Authority
EP
European Patent Office
Prior art keywords
section
rotor
sieve
sorting device
length
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
EP89100830A
Other languages
German (de)
English (en)
Other versions
EP0331883A2 (fr
EP0331883A3 (fr
Inventor
Ernest J. Charette
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.)
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss 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
Application filed by Sulzer Escher Wyss GmbH, Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Priority to AT89100830T priority Critical patent/ATE104002T1/de
Publication of EP0331883A2 publication Critical patent/EP0331883A2/fr
Publication of EP0331883A3 publication Critical patent/EP0331883A3/fr
Application granted granted Critical
Publication of EP0331883B1 publication Critical patent/EP0331883B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • This invention relates to a rotor in a pressure knot catcher.
  • knots and foreign bodies such as stones or pebbles have to be removed from the aqueous pulp suspension.
  • This removal is generally done this way; that the pulp suspension passes through a cylindrical sorter screen, the openings of which are dimensioned such that they remove undesirable solids.
  • the oversized solids such as knots and pebbles, clog the sorter openings.
  • periodic hydrodynamic pulses can be generated in a direction opposite to the flow of the suspension in order to clear the sorter.
  • Fig. 1 see e.g. also DE-C-543 259.
  • the hydrofoils 10 arranged on a rotor 12 sweep past the sorter screen 14 in order to clear it.
  • the hydrofoils 10 are subject to wear in the area near the screen, due in part to the action of the small solid particles that pass through the sorter. Since the hydrofoils 10 and the rotor 12 form a unitary construction in many commercially available sorters, the entire rotor / hydrofoil unit must be replaced when worn. In other sorting devices commercially available, the hydrofoil is replaced alone, even if only a portion of the hydrofoil is worn.
  • Other rotor blade configurations are in U.S. Patents 4,200,537; 3,363,759 and 3,680,696 and Canadian Patent No. 1,136,092.
  • the sorting apparatus comprises a cylindrical sorter and one Rotor, which is arranged concentrically within the sorter.
  • the rotor has a large number of blades for movement very close to the sieve.
  • the rotor blades are arranged on the surface of the rotor so that bands or rows of blades located on the circumference overlap one another. This arrangement ensures that the entire surface of the screen basket is covered by a rotor blade, so that the entire basket is kept free of blockages.
  • Each vane includes a first portion attached to the rotor, the first portion including an inclined surface, and a substantially radially expanding surface.
  • a second wing section is removably attached to the radially expanding surface of the first section, and a portion of the second section extends radially beyond the first wing section.
  • the thickness of the second wing section is equal to or greater than the diameter of the holes in the sorter screen.
  • the length of the second section that extends beyond the first section is greater than the diameter of the holes in the screen. It is also advantageous if the length of the projection of the inclined surface is greater than the length of the radially expanding surface of the first section. It is also advantageous if the liquid flowing between the rotor and sorter has an axial speed that is higher than or equal to 1.22 m / sec. is. The annular space between the sorter and the rotor is dimensioned so that this ratio is maintained.
  • the second wing section which directly reaches the sorter screen, is subject to the greatest wear. Since it is removably attached to the first wing section, it can either be removed or replaced without having to replace the entire rotor unit or the entire hydrofoil, as is previously known.
  • This invention therefore leads to lower operating costs of the sorting apparatus.
  • the fact that the thickness of the second section of the wing is equal to or greater than that The diameter of the holes in the sorter ensures effective hydrodynamic impulses to keep the openings unclogged. Since the length of the second wing section that extends beyond the first wing section is greater than the hole diameter, jamming is less likely to occur due to solid matter passing through the sorter.
  • the pressure knot sorting apparatus 20 shown in FIG. 2 comprises an inlet 22 for receiving cellulose suspension in a consistency range of 2-6%.
  • the pulp suspension moves upward and flows in through a sieve 24.
  • the suspension which passes through the sieve 24, flows out through the accept outlet 26.
  • Dilution water enters the apparatus 20 through the inlet 28. Knots, pebbles and other solids that are too large to pass through the holes in the sieve 24 emerge through the rejects outlet 30.
  • the rotor unit 32 is arranged concentrically with the sorter screen 24.
  • the rotor unit 32 generates outward hydrodynamic forces which serve to clear the screen 24.
  • the rotor unit 32 includes a plurality of vanes 34 that are directly over the screen Swipe past to create a hydrodynamic flow radially outward.
  • the vanes 34 are staggered on the rotor 32 so that circumferential bands or rows overlap. This arrangement ensures that the entire surface of the screen 24 is swept by the wings 34.
  • the wings 34 include a first portion 36 having an inclined surface 38 and a substantially radially expanding surface 40.
  • a second portion 42 of the wing 34 is removably attached to the radially expanding surface 40 of the first portion 36.
  • the second section 42 can be fastened to the first section 36 with screws 44. As the experts know, the second section 42 is subject to the greatest wear because it moves very close to the screen 24. Since the second section 42 is removable, it can be replaced after a period of use, if necessary.
  • the thickness W of the second section 42 is greater than or equal to the hole diameter in the sorter screen 24.
  • the fact that the thickness W of the pulse-generating second section 42 is larger than the hole diameter ensures that the maximum positive pulse is developed to clear the sieve 24. If the wing were narrower than the hole diameter, a negative impulse would develop on the downstream side of the wing while the wing passes over the hole diameter. It is also advantageous that the length X of the second section 42 of the wing 34, which extends beyond the first section 36, is greater than the hole diameter in the screen 24.
  • the length B is greater than or equal to the dimension A shown in FIG. 4. This ratio limits the steepness of the angle of the inclined surface 38. If length B were less than dimension A, the resulting angle would be quite steep. A steep angle would have a higher drag coefficient and would therefore be more force need to rotate the rotor unit 32. By keeping the angle less steep, the acceleration of the fluid is gradual, which in turn requires less power to operate. It is also desirable that the pulp suspension present in the space between the sieve 24 and drum 50 of the rotor unit 32 move up faster or equal to 1.22 m / sec. emotional.
  • Maintaining this speed will minimize the pulp deposition process in the area between the wings and the sorter. Such deposits would increase the force required to turn the rotor. In addition, maintaining the speeds will promote the axial movement toward the accept outlet 26 and reduce the possibility of settling to a minimum.
  • the vanes 34 are essentially aligned with the axis of rotation of the rotor unit 32.
  • the vanes 34 can also be arranged on the drum 50 so that an angle with the axis of rotation is created.
  • the rotor unit of the present invention is highly effective to clear the sorter screen 24. Since the second section 42 of the blade 34 is removable and the entire rotor unit 32 does not have to be replaced, substantial reductions in the operating costs can be achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Claims (7)

  1. Dispositif de triage, contenant un tamis cylindrique (24) et un rotor (32) disposé concentriquement à l'intérieur du tamis (24), le rotor (32) étant pourvu d'une pluralité d'ailettes (24), à proximité immédiate du tamis, caractérisé en ce que chaque ailette (34) comporte une première section (36), fixée sur le rotor (32), cette première section (36) présentant une surface inclinée (38) et une surface (40) à orientation radiale marquée, ainsi qu'une deuxième section (42), fixée amovible sur la surface (40), orientée radialement, de la première section (36), une partie de la deuxième section (42) s'étendant radialement vers le tamis (24), au-delà de la surface (40) orientée radialement, de la première section.
  2. Dispositif de triage selon la revendication 1, caractérisé en ce que le tamis (24) présente des orifices et en ce que l'épaisseur de la deuxième section (42) est égale ou supérieure au diamètre des orifices.
  3. Dispositif de triage selon la revendication 1, caractérisé en ce que le tamis présente des orifices et en ce que la longueur de la partie de la deuxième section (42), s'étendant au-delà de la surface (40) orientée radialement de la première section (36), est supérieure au diamètre des orifices.
  4. Dispositif de triage selon la revendication 1, caractérisé en ce que la longueur de la saillie de la surface inclinée (38) est supérieure ou égale à la longueur de la surface (40) s'étendant radialement de la première section (36).
  5. Dispositif de triage selon la revendication 1, caractérisé en ce que le rotor (32) et le tamis (24) forment un espace annulaire de taille telle qu'on atteint une vitesse axiale du liquide d'au moins 1,22 m/s.
  6. Dispositif de triage selon la revendication 1, caractérisé en ce que les ailettes (34) sont disposées obliquement, par rapport à l'axe de rotation du rotor (32),
  7. Dispositif de triage selon la revendication 1, caractérisé en ce que les ailettes (34) sont disposées sur le rotor (32) de telle façon qu'elles forment à la périphérie des bandes se chevauchant, recouvrant la totalite de la surface du tamis cylindrique (24).
EP89100830A 1988-03-07 1989-01-19 Epurateur sous pression trieur de noeuds Expired - Lifetime EP0331883B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89100830T ATE104002T1 (de) 1988-03-07 1989-01-19 Druck-knotenfaenger-sortierapparat.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16478788A 1988-03-07 1988-03-07
US164787 1988-03-07

Publications (3)

Publication Number Publication Date
EP0331883A2 EP0331883A2 (fr) 1989-09-13
EP0331883A3 EP0331883A3 (fr) 1991-06-12
EP0331883B1 true EP0331883B1 (fr) 1994-04-06

Family

ID=22596090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89100830A Expired - Lifetime EP0331883B1 (fr) 1988-03-07 1989-01-19 Epurateur sous pression trieur de noeuds

Country Status (5)

Country Link
EP (1) EP0331883B1 (fr)
AT (1) ATE104002T1 (fr)
CA (1) CA1321551C (fr)
DE (1) DE58907372D1 (fr)
FI (1) FI93870C (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE543259C (de) * 1929-05-09 1932-02-03 Kamyr Ab Liegender Schleudersichter fuer Zellstoff, Papierstoff o. dgl.
FR2410081A1 (fr) * 1977-11-23 1979-06-22 Lamort Ingenieurs Construc E E Appareil pour l'epuration des pates a papier
FI77481C (fi) * 1985-05-29 1989-03-10 Ahlstroem Oy Sil.

Also Published As

Publication number Publication date
ATE104002T1 (de) 1994-04-15
EP0331883A2 (fr) 1989-09-13
FI890811A7 (fi) 1989-09-08
CA1321551C (fr) 1993-08-24
DE58907372D1 (de) 1994-05-11
FI93870B (fi) 1995-02-28
FI890811A0 (fi) 1989-02-20
FI93870C (fi) 1995-06-12
EP0331883A3 (fr) 1991-06-12

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