US3865243A - Pressure strainer device - Google Patents

Pressure strainer device Download PDF

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Publication number
US3865243A
US3865243A US284867A US28486772A US3865243A US 3865243 A US3865243 A US 3865243A US 284867 A US284867 A US 284867A US 28486772 A US28486772 A US 28486772A US 3865243 A US3865243 A US 3865243A
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US
United States
Prior art keywords
vane
pulp
straining
cavity
cylinder
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
US284867A
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English (en)
Inventor
Rauno Salminen
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.)
Yhtyneet Paperitehtaat Oy
Original Assignee
Yhtyneet Paperitehtaat 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 Yhtyneet Paperitehtaat Oy filed Critical Yhtyneet Paperitehtaat Oy
Application granted granted Critical
Publication of US3865243A publication Critical patent/US3865243A/en
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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
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2230/00—Specific aspects relating to the whole B07B subclass
    • B07B2230/01—Wet separation

Definitions

  • Salminen 1 PRESSURE STRAINER DEVICE Rauno Salminen, Valkeakoski, Finland
  • the reject space is separated from the entry space of the pulp to be strained by a secondary straining cylinder, through which the acceptable pulp still travelling along with the rejected pulp is strained and in connection with which there is provided at least one secondary vane revolving about its axis and moving at a small distance from it, which secondary vane cleans the face of the secondary straining cylinder facing the reject space.
  • An object of the present invention is to improve the first-mentioned pressure straining device so that no second pressure straining device is needed at all, whereby considerable savings are achieved in initial costs, operating costs and maintenance costs.
  • a pressure straining device according to the invention is characterized in that a reject space is separated from the entry space ofthe pulp to be strained by means of a secondary straining cylinder, through which acceptable pulp travelling along with the rejected pulp is strained and in connection with which there is provided at least one secondary vane revolving about its axis and moving at a small distance from it, this vane cleaning the face.
  • the vane and secondary vane are integrally attached to one and the same rotor.
  • FIG. 1 shows a pressure straining device in longitudinal section taken along line ll in FIG. 2;
  • FIG. 2 is a section taken along line ll'lI inFlG. 1.
  • Pulp suspension is supplied under pressure through the pipe 1 into an entry space or inlet chamber 2 for the pulp to be strained, this space being confined on the outside by a jacket 3 and on the inside by a straining cylinder 4.
  • a straining cylinder 4 Associated with the straining cylinder 4 are two vanes 5 revolving about its axis and moving at a small distance from it and which clean the outer surface of the straining cylinder.
  • the vanes 5 are attached to the ends of a transversal arm 6 rotating along with the shaft 7.
  • the lower ends of the vanes 5 are connected by a continuous bracing ring 8, which prevents the downward travel of the pulp to be strained in the entry space.
  • the accepted pulp flows through the straining cylinder 4 from the entry space 2 into the annular space 9 and thence through the exit pipe 10 for further treatment. Simultaneously with the passage of the accepted 2 pulp through thestraining cylinder 4, a pulp layer enriched with rejected particles forms on its outer surface.
  • the vanes 5 remove this layer as it is formed.
  • the vanes 5 have a cavity 11 extending longitudinally therealong and opening through a slot 12 towards the straining cylinder 4. At the .lower end the cavity 11 opens through the bracing ring 8 into a reject space or collection chamber 13. At its upper end the cavity 11 is closed.
  • the rejected pulp is detached from the outer surface of the straining cylinder 4 by the suction produced by the vane 5 and passes through the slot 12 in I the vane, under the effect of dynamic pressure and centrifugal force, into the cavity 11 and then into the reject space 13.
  • the reject space 13 is externally bounded by a secondary straining cylinder 14 which communicates with the entry space 2 so that acceptable pulp still accompanying the rejected pulp is strained by cylinder 14 and passed into entry space 2.
  • a secondary straining cylinder 14 which communicates with the entry space 2 so that acceptable pulp still accompanying the rejected pulp is strained by cylinder 14 and passed into entry space 2.
  • two downwardly projecting secondary vanes 15 are attached to the bracing ring 8, which move at a small distance from the inner surface of the secondary straining cylinder 14.
  • the lower ends of the secondary vanes 15 are connected by a continuous closing ring 16, which prevents the downward flow of the rejected pulp.
  • the accepted pulp flows through the secondary straining cylinder 14 from the reject space 13 back into the entry space 2, where it rises upward and is once more exposed to the effect of the vanes-5.
  • the secondary vanes remove this layer as it is formed.
  • the secondary vanes have a cavity 17 extending longitudinally thereof and opening through a slot 18 towards the secondary straining cylinder.
  • the cavity 17 opens through the closing ring 16 into the secondary reject space or collection chamber 19 and further into the discharge pipe 20.
  • straining cylinders 4 may be two .or more,
  • the reject spaces 13 and 19 are located in the I lower part of the pressure straining device, but they may be equally well provided in the upper part of the straining device.
  • the vane 5 moves onthe outside of the straining cylinder 4 and the secondary vane 15 moves on the inside of the secondary straining cylinder 14.
  • their locations may be reversed if the pulp to be strained is introduced into the central part of the pressure straining device.
  • a pressure straining device for a pulp suspension comprising an inlet chamber for pulp to be strained, at least one straining cylinder bounding said inlet chamber and through which acceptable pulp is strained, at least one rotatable vane movable in said inlet chamber proximate the surface of said straining cylinder, said vane having a cavity extending therein, one end of which is closed, said cavity extending along the vane longitudinally and saidvane having a slot leading into said cavity and facing said surface of the straining cylinder to admit unstrained pulp collected on said surface into said cavity, a collection chamber having means for isolating itself from said inlet chamber, said cavity of said vane communicating at the other end thereof with said collection chamber for introducing said unstrained pulp thereinto, a secondary straining cylinder concentric with said first screening cylinder, extending outwardly and below said first straining cylinder and forming a separating screen between said collection chamber and said inlet chamber to strain said pulp received from the cavity of said vane, acceptable pulp passing thru said secondary straining cylinder and
  • a pressure straining device comprising a common rotor to which the first and secondary vane are integrally attached.
  • a pressure straining device according to. claim 1 wherein the surface of the first said straining cylinder on which the vane moves is the outer surface thereof whereas the surface of the secondary straining cylinder on which the secondary vane moves is the inner surface thereof.
  • a pressure straining device according to claim 1 wherein said secondary vane has a cavity therein one end of which is closed, said cavity, extending along the vane longitudinally, a slot leading into said cavity and facing said secondary straining cylinder to admit collected pulp thereon into said cavity, said cavity in said secondary vane leading into a secondary collection chamber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Filtration Of Liquid (AREA)
US284867A 1972-06-21 1972-08-30 Pressure strainer device Expired - Lifetime US3865243A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI721773A FI51221C (fi) 1972-06-21 1972-06-21 Painesihtilaite.

Publications (1)

Publication Number Publication Date
US3865243A true US3865243A (en) 1975-02-11

Family

ID=8506152

Family Applications (1)

Application Number Title Priority Date Filing Date
US284867A Expired - Lifetime US3865243A (en) 1972-06-21 1972-08-30 Pressure strainer device

Country Status (8)

Country Link
US (1) US3865243A (enrdf_load_stackoverflow)
JP (1) JPS4935959A (enrdf_load_stackoverflow)
CA (1) CA967513A (enrdf_load_stackoverflow)
DE (1) DE2241756A1 (enrdf_load_stackoverflow)
FI (1) FI51221C (enrdf_load_stackoverflow)
FR (1) FR2189127B3 (enrdf_load_stackoverflow)
GB (1) GB1384414A (enrdf_load_stackoverflow)
SE (1) SE370736B (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4309284A (en) * 1979-08-30 1982-01-05 Mitsubishi Jukogyo Kabushiki Kaisha Screen device for paper material
US4911828A (en) * 1987-02-07 1990-03-27 J.M. Voith Gmbh Rejects sorting apparatus
US4919797A (en) * 1989-02-09 1990-04-24 The Black Clawson Company Screening apparatus for paper making stock
US5009774A (en) * 1989-10-30 1991-04-23 Beloit Corporation Pulseless screen
US5071543A (en) * 1989-02-16 1991-12-10 Oy Tampella Ab Method of screening pulp and a screening apparatus
WO1994025183A1 (en) * 1993-04-30 1994-11-10 The Black Clawson Company Screening apparatus with adjustable hydrofoil portion
WO1995006159A1 (en) * 1993-08-20 1995-03-02 Valmet Corporation Method and pressure screen for screening fibre suspension
US5509536A (en) * 1993-03-16 1996-04-23 Sulzer-Escher Wyss Gmbh Method and apparatus for the sorting of fiber suspensions
US5575395A (en) * 1994-07-15 1996-11-19 A. Ahlstrom Corporation Method and apparatus for screening fibrous suspensions
US6193073B1 (en) * 1997-08-06 2001-02-27 Thermo Black Clawson Inc. Paper stock screening apparatus and method
US20140124431A1 (en) * 2010-09-03 2014-05-08 Johnny Leon LOVE Filtration method with self-cleaning filter assembly
CN111957565A (zh) * 2020-08-19 2020-11-20 安徽东方果园生物科技有限公司 一种基于超高压的果蔬脆片的速冻前处理系统
CN114438811A (zh) * 2022-02-11 2022-05-06 平湖荣成环保科技有限公司 一种牛皮卡纸生产用浆料除杂装置
US20240173655A1 (en) * 2022-11-25 2024-05-30 Samsung Electronics Co., Ltd. Microplastic filter for washing machines or other appliances

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE420331B (sv) * 1978-03-08 1981-09-28 Svenska Traeforskningsinst Forfarande vid en silanordning for rensning av oppningarna i en silplat i form av en trumma samt anordning for utforande av forfarandet
SE458037C (sv) * 1987-07-03 1990-09-10 Kamyr Ab Apparat foer uppdelning av en suspension av fiberhaltig cellulosamassa
FI77280C (fi) * 1987-10-13 1989-02-10 Ahlstroem Oy Foerfarande och anordning foer behandling av fibersuspension.
FI80735B (fi) * 1988-08-04 1990-03-30 Tampella Oy Ab Foerfarande och anordning foer sortering och behandling av massa.
FR2743505B1 (fr) * 1996-01-15 1998-02-13 Cellier Groupe Sa Dispositif de filtration autodecolmatant

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1134304A (en) * 1912-05-17 1915-04-06 Peder P Westbye Pulp-screen.
US1537691A (en) * 1923-08-16 1925-05-12 American Voith Contact Co Centrifugal screen
US3168467A (en) * 1962-07-20 1965-02-02 George W Dreyer Self-cleaning strainers
US3232436A (en) * 1961-02-09 1966-02-01 Nilsson Nils Gunnar Holger Straining apparatuses
US3394809A (en) * 1965-01-25 1968-07-30 Hunter Allen Bruce Pulp screens
US3399772A (en) * 1966-02-14 1968-09-03 Beloit Corp Duplex pulp screen
US3726401A (en) * 1970-12-16 1973-04-10 Bird Machine Co Screening machine
US3759392A (en) * 1972-02-03 1973-09-18 Yhtyneet Paperitehtaat Oy Pressure straining device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1134304A (en) * 1912-05-17 1915-04-06 Peder P Westbye Pulp-screen.
US1537691A (en) * 1923-08-16 1925-05-12 American Voith Contact Co Centrifugal screen
US3232436A (en) * 1961-02-09 1966-02-01 Nilsson Nils Gunnar Holger Straining apparatuses
US3168467A (en) * 1962-07-20 1965-02-02 George W Dreyer Self-cleaning strainers
US3394809A (en) * 1965-01-25 1968-07-30 Hunter Allen Bruce Pulp screens
US3399772A (en) * 1966-02-14 1968-09-03 Beloit Corp Duplex pulp screen
US3726401A (en) * 1970-12-16 1973-04-10 Bird Machine Co Screening machine
US3759392A (en) * 1972-02-03 1973-09-18 Yhtyneet Paperitehtaat Oy Pressure straining device

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4309284A (en) * 1979-08-30 1982-01-05 Mitsubishi Jukogyo Kabushiki Kaisha Screen device for paper material
US4911828A (en) * 1987-02-07 1990-03-27 J.M. Voith Gmbh Rejects sorting apparatus
US4919797A (en) * 1989-02-09 1990-04-24 The Black Clawson Company Screening apparatus for paper making stock
US5071543A (en) * 1989-02-16 1991-12-10 Oy Tampella Ab Method of screening pulp and a screening apparatus
US5009774A (en) * 1989-10-30 1991-04-23 Beloit Corporation Pulseless screen
US5509536A (en) * 1993-03-16 1996-04-23 Sulzer-Escher Wyss Gmbh Method and apparatus for the sorting of fiber suspensions
WO1994025183A1 (en) * 1993-04-30 1994-11-10 The Black Clawson Company Screening apparatus with adjustable hydrofoil portion
US5622267A (en) * 1993-08-20 1997-04-22 Valmet Corporation Method and pressure screen for screening fibre suspension
WO1995006159A1 (en) * 1993-08-20 1995-03-02 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
US6193073B1 (en) * 1997-08-06 2001-02-27 Thermo Black Clawson Inc. Paper stock screening apparatus and method
US20140124431A1 (en) * 2010-09-03 2014-05-08 Johnny Leon LOVE Filtration method with self-cleaning filter assembly
US9061226B2 (en) * 2010-09-03 2015-06-23 Johnny Leon LOVE Filtration method with self-cleaning filter assembly
CN111957565A (zh) * 2020-08-19 2020-11-20 安徽东方果园生物科技有限公司 一种基于超高压的果蔬脆片的速冻前处理系统
CN114438811A (zh) * 2022-02-11 2022-05-06 平湖荣成环保科技有限公司 一种牛皮卡纸生产用浆料除杂装置
CN114438811B (zh) * 2022-02-11 2024-03-01 平湖荣成环保科技有限公司 一种牛皮卡纸生产用浆料除杂装置
US20240173655A1 (en) * 2022-11-25 2024-05-30 Samsung Electronics Co., Ltd. Microplastic filter for washing machines or other appliances

Also Published As

Publication number Publication date
CA967513A (en) 1975-05-13
DE2241756A1 (de) 1974-01-17
JPS4935959A (enrdf_load_stackoverflow) 1974-04-03
GB1384414A (en) 1975-02-19
FI51221B (enrdf_load_stackoverflow) 1976-08-02
SE370736B (enrdf_load_stackoverflow) 1974-10-28
FR2189127A1 (enrdf_load_stackoverflow) 1974-01-25
FR2189127B3 (enrdf_load_stackoverflow) 1979-01-12
FI51221C (fi) 1976-11-10

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