US3677402A - Centrifugal classifier - Google Patents

Centrifugal classifier Download PDF

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Publication number
US3677402A
US3677402A US73021A US3677402DA US3677402A US 3677402 A US3677402 A US 3677402A US 73021 A US73021 A US 73021A US 3677402D A US3677402D A US 3677402DA US 3677402 A US3677402 A US 3677402A
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US
United States
Prior art keywords
perforations
basket
rotatable
stationary
housing
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
US73021A
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English (en)
Inventor
Emil Holz
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.)
Finckh Hermann Metalltuch und Maschinenfabrik
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Finckh Hermann Metalltuch und Maschinenfabrik
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Publication of US3677402A publication Critical patent/US3677402A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • D21D5/06—Rotary screen-drums

Definitions

  • a centrifugal classifier for sorting suspensions of fibrous materials has a housing with an intake defined in the upper region thereof.
  • a stationary sieve basket is arranged with its axis vertically oriented in the housing and defines a plurality of perforations of a predetermined size.
  • a rotatable sieve basket is mounted adjacent and coaxial with respect to the stationary basket and extends beyond the upper edge of the stationary basket to the vicinity of the intake.
  • a plurality of perforations are also defined in the rotatable basket, the perforations in the lower region being of a predetermined size larger than the perforations in the stationary basket and the perforations in the upper end being of a predetermined size larger than the perforations in the lower region of the rotatable basket.
  • the suspension flows from the largest to the smallest perforations.
  • the present invention relates to a centrifugal device for suspensions of fibrous materials having a perpendicularly disposed sieve basket and a concentric drum which rotates closely therearound and which is provided with perforations,
  • the present invention provides a drum designed as a sieve basket revolving with respect to a pedestal and extending over a stationary sieve basket by an amount which permits it to extend into the area of an intake.
  • the perforations in this upper portion of the drum are larger than those in the lower portion through which the material subsequently flows out of the drum, and the perforations in the sieve baskets through which the material flows thereafter are again smaller than the last mentioned perforations.
  • the housing of the device below the upper portion of the rotating sieve basket and outside of the range of the sieve baskets is provided with a coarse material trough and an associated discharge pipe.
  • annular baffle member is inserted into the intake stream between the upper portion of the rotating sieve basket and the intake.
  • This baffle leaves free at its upper end a passage to the upper portion of the rotating sieve basket, and its lower portion extends into a course material trough.
  • the thus twice preclassified suspension is then sorted a third time in the coarse perforations of the upper portion of the rotating sieve basket through which it flows. Then the suspension reaches the lower region of the rotating sieve basket and is sorted a fourth time when it flows in the opposite direction through the finer perforations in this lower portion and finally, when it flows through the finest perforations in the stationary sieve basket directly enclosing the rotating sieve basket, it is sorted a fifth time.
  • FIG. 1 is a front elevation, cross-sectional view of a centrifugal classifier according to the present invention.
  • FIG. 2 is a cross-sectional view taken generally along the line 2- 2 of FIG. 1.
  • An annular chamber 14 is defined by a wall 42 in a housing 13 which stands on a base 11 and is closed off by an upper cover 12.
  • a tangentially directed intake pipe 15 is also provided, as well as a conical chamber 16 which is defined by a wall 43, and joins with a radially disposed outlet pipe 17.
  • This conical chamber 16 is covered toward its center axis by a stationary sieve basket 18.
  • a second sieve basket 19 Within the stationary sieve basket 18, a second sieve basket 19 with an upper region 19' and a lower region 19" is arranged to rotate in a close relationship with respect to the stationary sieve basket.
  • a support plate 21 is provided for basket 19, which plate 21 is fastened to a driven shaft 20 and covers the basket 19 at the top of its upper region 19'.
  • the shaft 20 is mounted on an inner base, or pedestal, 22 of housing 13 and can be driven by a suitable drive disc, e. g. a pulley 42, rotatably mounted in the lower base 11. Any suitable, known means, such as a motor driven belt (not shown), may be used to rotate pulley 42.
  • the rotating sieve basket 19 preferably rotates with very little clearance between it and the stationary sieve basket 18.
  • a plurality of clearing vanes 23 are firmly connected in a know manner to the base 22 and extend to the vicinity of the inside of the rotating sieve basket. For simplicity, only one of these clearing vanes 23 is shown in the drawings, but it is to be understood that others are arranged about base 22 in a similar manner.
  • At the bottom of the annular chamber 14 is a coarse material trough 24 is provided, and at the foot of the base 22 that is, below basket 19 a slop material trough 25 is arranged.
  • Each trough 24, 25 has an associated outlet pipe 26 (FIG. 2) or 27, respectively, for periodically discharging the collected materials.
  • conical portion of the annular bafile 28 extends to the vicinity of cover 12 of housing 13, where it also leaves a passage through which the incoming suspension reaches the upper portion of the rotating sieve basket 19 after it has been downwardly deflected.
  • This upper portion of the rotating sieve basket 19 is an extended portion which extends beyond the upper edge of the stationary sieve basket 18, and its supporting plate 21 is arranged adjacent to cover 12 of housing 13.
  • the direction of rotation of sieve basket 19 is indicated by arrow A (FIG. 2).
  • the direction of flow of the suspension and its components within the classifier is indicated by smaller arrows which will be explained later, while the locations of the different sorting, or classification, stages are marked 1 through V.
  • Arrows 30 indicate the tangential influx direction of a suitable, known suspension which is passed under pressure through intake 15.
  • the suspension is supplied to intake 15 from any suitable, known source (not shown).
  • the heavy components of the suspension are disposed in the lower region of the flowthrough cross section of intake 15 and, therefore, brush along the cylindrical lower portion of baffle 28. Due to their weight, they sink lower and lower and finally reach trough 24.
  • This is shown in FIG. 1 by arrow 31 in sorting stage I.
  • the tangentially inflowing suspension is forced away in an upward direction, as indicated in FIG. 1 by arrows 32. It finally passes over the upper edge of the baffle 28 and through the gap remaining between baffle 28 and cover 12 and reaches the inner region of the bafile 28, because it is deflected in a through pipe 26 (arrow 39 in FIG. 2).
  • the particles held back from the sieve perforations of basket 19 also reach trough 24.
  • the completely classified suspension leaves the housing 13 through outlet pipe 17 (arrow 38).
  • the respective sieve perforations are shown only schematically by white spaces of varying sizes, which should not be considered as being to scale, particularly since the perforations may be, for example, either round or slitted and could possibly also have a cross section which varies over their fiowthrough length.
  • Centrifugal classifier for sorting suspensions of fibrous materials, comprising, in combination:
  • a housing having an upper region with a periphery
  • a stationary sieve basket arranged in said housing to have a vertically oriented axis and defining an upper edge and a plurality of perforations of a predetermined size
  • a rotatable sieve basket mounted adjacent, inside and coaxially with respect to said stationary basket and having an upper region with an extended portion extending beyond the upper edge of said stationary basket to the vicinity of said intake and a lower region, said rotatable sieve basket defining a plurality of perforations, the perforations in the lower region of said rotatable basket being of a predetermined size and larger than the perforations in said stationary basket and the perforations in the upper region of said rotatable basket being of a predetermined size and larger than the perforations in the lower region of said rotatable basket so that a suspension may flow from the largest perforations to the smallest perforations, and material outlet means in said housing.
  • centrifugal classifier defined in claim 1, further including a coarse material trough and an associated discharge pipe arranged outside of said sieve basket and below the extended portion of said rotating sieve basket to receive coarse material to large to pass through the perforations in said extended portion.
  • centrifugal classifier defined in claim 4, further including a slop material trough and an associated discharge pipe arranged below said rotatable sieve basket for receiving material too large to pass through the perforations in the lower region of said rotatable sieve basket and the perforations in said stationary sieve basket.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Centrifugal Separators (AREA)
  • Filtration Of Liquid (AREA)
  • Combined Means For Separation Of Solids (AREA)
US73021A 1969-09-17 1970-09-17 Centrifugal classifier Expired - Lifetime US3677402A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1946948 1969-09-17

Publications (1)

Publication Number Publication Date
US3677402A true US3677402A (en) 1972-07-18

Family

ID=5745675

Family Applications (1)

Application Number Title Priority Date Filing Date
US73021A Expired - Lifetime US3677402A (en) 1969-09-17 1970-09-17 Centrifugal classifier

Country Status (10)

Country Link
US (1) US3677402A (enrdf_load_stackoverflow)
JP (1) JPS5027913B1 (enrdf_load_stackoverflow)
AT (1) AT300538B (enrdf_load_stackoverflow)
CA (1) CA937895A (enrdf_load_stackoverflow)
DE (1) DE1946948B1 (enrdf_load_stackoverflow)
FI (1) FI53858C (enrdf_load_stackoverflow)
FR (1) FR2061260A5 (enrdf_load_stackoverflow)
GB (1) GB1258846A (enrdf_load_stackoverflow)
NO (1) NO136418C (enrdf_load_stackoverflow)
SE (1) SE371225B (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785495A (en) * 1971-08-16 1974-01-15 Finckh H Metalltuch Maschfab Pressure filter for fibrous suspensions
US3898157A (en) * 1973-03-23 1975-08-05 Hooper & Co Ltd S W Two stage pressure pulp screen device with stationary cylindrical screen
US4188286A (en) * 1977-03-23 1980-02-12 Hermann Finckh Maschinenfabrik Screening apparatus for fiber suspensions
US4202761A (en) * 1977-03-23 1980-05-13 Hermann Finckh Maschinenfabrik Sorting apparatus for sorting fiber suspensions
DE3121855A1 (de) * 1981-06-02 1982-12-16 J.M. Voith Gmbh, 7920 Heidenheim "rotationssortierer fuer faserstoffsuspensionen"
US4729837A (en) * 1985-05-20 1988-03-08 A. Ahlstrom Corporation Method and apparatus for thickening a suspension
US5271503A (en) * 1990-05-25 1993-12-21 Sunds Defibrator Industries Aktiebolag Screening device
US5575395A (en) * 1994-07-15 1996-11-19 A. Ahlstrom Corporation Method and apparatus for screening fibrous suspensions
US5580446A (en) * 1994-10-20 1996-12-03 International Paper Company Screen, vortex apparatus for cleaning recycled pulp and related process
US5622267A (en) * 1993-08-20 1997-04-22 Valmet Corporation Method and pressure screen for screening fibre suspension
US20040035761A1 (en) * 2002-07-23 2004-02-26 Voith Paper Patent Gmbh Pressurized screen for screening a fibrous suspension
US7735655B2 (en) 2004-12-10 2010-06-15 Metso Paper, Inc. Screen and method for screening pulp

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698284B1 (fr) * 1992-11-24 1995-03-03 Fluides Automation Dispositif de filtration à filtre auto-nettoyant.
DE19821447A1 (de) * 1998-05-13 1999-11-18 Fiedler Heinrich Gmbh Vorrichtung zum Sortieren von faserstoffhaltiger Suspension

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE588116C (de) * 1931-09-06 1933-11-13 Andreas Biffar Liegender Schleudersichter mit axialer Einfuehrung von Stoff und Verduennungswasser
DE945317C (de) * 1954-07-24 1956-07-05 Krauss Maffei Ag Vibrationszentrifuge mit kegelfoermig zum Austragende erweiterten Siebtrommeln

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE588116C (de) * 1931-09-06 1933-11-13 Andreas Biffar Liegender Schleudersichter mit axialer Einfuehrung von Stoff und Verduennungswasser
DE945317C (de) * 1954-07-24 1956-07-05 Krauss Maffei Ag Vibrationszentrifuge mit kegelfoermig zum Austragende erweiterten Siebtrommeln

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785495A (en) * 1971-08-16 1974-01-15 Finckh H Metalltuch Maschfab Pressure filter for fibrous suspensions
US3898157A (en) * 1973-03-23 1975-08-05 Hooper & Co Ltd S W Two stage pressure pulp screen device with stationary cylindrical screen
US4188286A (en) * 1977-03-23 1980-02-12 Hermann Finckh Maschinenfabrik Screening apparatus for fiber suspensions
US4202761A (en) * 1977-03-23 1980-05-13 Hermann Finckh Maschinenfabrik Sorting apparatus for sorting fiber suspensions
DE3121855A1 (de) * 1981-06-02 1982-12-16 J.M. Voith Gmbh, 7920 Heidenheim "rotationssortierer fuer faserstoffsuspensionen"
US4729837A (en) * 1985-05-20 1988-03-08 A. Ahlstrom Corporation Method and apparatus for thickening a suspension
US5271503A (en) * 1990-05-25 1993-12-21 Sunds Defibrator Industries Aktiebolag Screening device
US5622267A (en) * 1993-08-20 1997-04-22 Valmet Corporation Method and pressure screen for screening fibre suspension
US5575395A (en) * 1994-07-15 1996-11-19 A. Ahlstrom Corporation Method and apparatus for screening fibrous suspensions
US5580446A (en) * 1994-10-20 1996-12-03 International Paper Company Screen, vortex apparatus for cleaning recycled pulp and related process
US5707488A (en) * 1994-10-20 1998-01-13 International Paper Company Screen/vortex apparatus for cleaning recycled pulp related process
US20040035761A1 (en) * 2002-07-23 2004-02-26 Voith Paper Patent Gmbh Pressurized screen for screening a fibrous suspension
US7735655B2 (en) 2004-12-10 2010-06-15 Metso Paper, Inc. Screen and method for screening pulp

Also Published As

Publication number Publication date
FI53858C (fi) 1978-08-10
DE1946948B1 (de) 1971-02-04
SE371225B (enrdf_load_stackoverflow) 1974-11-11
FI53858B (fi) 1978-05-02
JPS5027913B1 (enrdf_load_stackoverflow) 1975-09-11
FR2061260A5 (enrdf_load_stackoverflow) 1971-06-18
GB1258846A (enrdf_load_stackoverflow) 1971-12-30
NO136418B (enrdf_load_stackoverflow) 1977-05-23
NO136418C (no) 1977-08-31
CA937895A (en) 1973-12-04
AT300538B (de) 1972-07-25

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