WO2002064884A1 - Filter for fibrous suspensions - Google Patents
Filter for fibrous suspensions Download PDFInfo
- Publication number
- WO2002064884A1 WO2002064884A1 PCT/EP2002/001548 EP0201548W WO02064884A1 WO 2002064884 A1 WO2002064884 A1 WO 2002064884A1 EP 0201548 W EP0201548 W EP 0201548W WO 02064884 A1 WO02064884 A1 WO 02064884A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- filter
- filtering basket
- profile
- wing
- Prior art date
Links
- 239000000725 suspension Substances 0.000 title claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 33
- 239000011796 hollow space material Substances 0.000 claims abstract description 18
- 238000005304 joining Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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
-
- 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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
- B01D29/356—Self-supporting filtering elements arranged for outward flow filtration open-ended, the arrival of the mixture to be filtered and the discharge of the concentrated mixture are situated on both opposite sides of the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
- B01D29/86—Retarding cake deposition on the filter during the filtration period, e.g. using stirrers
Definitions
- the present invention relates to a rotary filter for fibrous suspensions, particularly adapted to be used in separation of foreign matter and polluting contraries. It is well known that in order to separate contraries polluting aqueous suspensions of fibres such as the suspensions used in the paper industry, mechanical devices called strainers are used.
- Said strainers are generally rotary filters in which the separation of contraries from the suspension occurs through the so called high density screening process.
- the rotary filter consists of a central rotor around which a filtering basket is arranged, both being inserted in a holding housing.
- the suspension to be purified is conveyed from a feeding zone at the upper part of said housing, through a plurality of diffuser ducts, to the annular hollow space defined between the rotor and the filtering basket.
- the fibrous suspension is caused to rotate and is divided into two fractions by the centrifugal force, the first fraction being generally called "accepts" and is the filtered fraction used in the subsequent working stages for making paper.
- the second fraction generally called "rejects” consists of the contraries of the fibrous suspension left inside the hollow space and collected in a discharge chamber arranged at the bottom part of the housing to be subsequently ejected.
- Document EP-A-0206975 is for instance known, in which a filter provided with wing profiles is disclosed, whose surface facing the basket has a distance to the basket first increasing and then decreasing so as to generate first a positive pressure and then a negative pressure.
- wing profiles extend in the hollow space in an axial and circumferential direction and have a surface facing the filtering basket with a convex curved shape whose points have a distance relative to the rotation centre of the rotor steadily decreasing when said surface is being run in the direction opposite to the rotation direction of the rotor.
- the present invention aims at overcoming said limitation.
- the main object of the invention is to provide a rotary filter improving detachment of the polluting fibres deposited on the inner surface of the filtering basket in comparison with the conventional rotary filters. Further object of the invention is to provide a rotary filter allowing to handle a greater hourly quantity of fibrous suspension in comparison with the conventional rotary filters.
- a last but not least object of the invention is to provide a filter allowing also a greater degree of purification of the fibrous surface in comparison with the known filters. Said objects are attained by making a filter for fibrous suspensions that according to the contents of the main claim comprises:
- a feeding chamber for the fibrous suspension to be filtered defined at the upper part of said housing and communicating with the upper part of said rotor;
- wing profiles arranged on the outer lateral surface of said rotor in said annular hollow space with an axial development along said rotor, each profile having a curved outer surface with convexity facing said filtering basket, extending between a head end and a tail end, wherein said head end has a greater distance from said longitudinal axis relative to said tail end, and is characterised in that said outer surface of said wing profile is provided with one or more discontinuity zones whose points have an increasing distance from said longitudinal axis when running on said outer surface of the wing profile in a direction opposite to the rotation direction of said rotor.
- the filter of the invention has five wing profiles with an axial development for the whole length of the rotor and arranged symmetrically relative to the rotation axis of the rotor according to the vertices of a regular pentagon.
- Each profile has the outer surface with curved convex contour facing the filtering basket and defined by three steps connected to each other by discontinuity zones defined by radiused surfaces joining them two by two.
- the wing profiles and the steps made in the curved contour of each wing profile may be made in a different quantity such as five and three profiles respectively.
- said radiused surfaces are arranged radially relative to the rotor axis.
- the wing profiles are connected to the outer surface of the rotor through joining blocks arranged close to the upper and lower end of the rotor respectively.
- the rotary filter of the invention allows an increase of the filtering performance, a greater hourly production and less cleaning interventions in comparison with equivalent rotary filters of known type.
- Fig. 1 is a longitudinal sectional view of the rotary filter of the invention
- FIG. 2 is an isometric view of the rotor of the filter of the invention
- FIG. 3 is a cross sectional view of the filter of the invention.
- FIG. 4 shows an enlarged detail of the cross sectional view of Fig. 3;
- the rotary filter of the invention generally indicated with reference numeral 1 , comprises a rotor 2 of a generally cylindrical shape arranged with the longitudinal axis 3 in a generally vertical direction and connected to driving means not shown in the drawings, adapted to cause its rotation, and a filtering basket 4 arranged generally coaxially outside the rotor 2, provided with a plurality of openings 5 made in its lateral surface 6 and defining the filtering surface generally indicated with numeral 7.
- An outer housing 9 accommodates the filtering basket 4 and the rotor 2, a hollow space 8 being defined between the lateral surface 2a of the rotor 2 and the filtering surface 7 of the filtering basket 5. Inside the housing 9 one can see:
- a feeding chamber 10 for the fibrous suspension S to be filtered defined at the upper part of the housing 9 and communicating with the upper part 2b of said rotor 2;
- a plurality of ducts generally indicated with numeral 13 are provided, adapted to put the feeding chamber 10 in communication with the annular hollow space 8.
- Each of said ducts 13 is developed between an inlet section 2c at the upper base of rotor 2 defining the feeding chamber 9 and an outlet section 14 at the lateral surface 2a of said rotor 2 defining the hollow space 8.
- each wing profile 15 has a head end 15a which is arranged at a distance R1 relative to the longitudinal axis 3 of rotor 2 which is greater than the distance R2 of the tail end 15b.
- the outer surface 16 of said wing profile 15 is provided with two discontinuity zones 16b, 16d whose points have an increasing distance from said longitudinal axis 3 running on said outer surface 16 of said wing profile 15 in a direction opposite to the rotation direction of said rotor 2, indicated with arrow V.
- the convex curved outer surface 16 of the wing profile 15 comprises three steps 16a, 16c, 16e one after the other and mutually connected by said discontinuity zones 16b, 16d, each zone consisting of a generally flat surface 16f, 16g.
- first step 16a starts at the head end 15a ending at the first discontinuity zone 16b.
- the points of the step surface have a distance from the axis 3 of the rotor 2 decreasing from the maximum distance R1 to the minimum distance R3.
- the second step 16c it starts at the first discontinuity zone 16b ending at the second discontinuity zone 16d and like the first step the points of its surface have a distance relative to the axis 3 of rotor 2 decreasing from the maximum quantity R4 to the minimum quantity R5.
- the third step 16e starting at the second discontinuity zone 16d ending at the tail end 15b has the distance from the axis 3 of rotor 2 of the points of its surface decreasing from the maximum quantity R6 to the minimum quantity R2.
- discontinuity zones 16b and 16d are axially extending for the whole length of the wing profile so as to have the configuration shown more particularly in
- Each wing profile 15 is connected to the rotor 2 by the interposition of joining blocks 17a, 17b where the fastening means may be screws, welds and the like.
- the arrangement of said joining blocks is spacing the wing profile 15 from the rotor 2 and therefore said profile is fully surrounded by the suspension S filled in the hollow space 8.
- each wing profile 15 in view of the diminishing curved shape of the profile, generates a set of negative pulsating macropressures (macrowaves) each consisting of a set of pulsating negative micropressures
- microwaves the latter being produced by the particular stepwise configuration of each wing profile with the above described features.
- Said constructional versions may for instance consist of a different number of wing profiles, a different arrangement of the profiles along the lateral surface of the rotor or even a different structure and arrangements of the means fastening the wing profiles to the rotor. It is however to be understood that said not described and illustrated constructional modifications when falling within the scope of the appended claims, should be considered as covered by the present patent.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Centrifugal Separators (AREA)
- Filtering Materials (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Paper (AREA)
- Inorganic Fibers (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2003-7010755A KR20040010593A (en) | 2001-02-15 | 2002-02-14 | Filter for fibrous suspensions |
CA002435616A CA2435616A1 (en) | 2001-02-15 | 2002-02-14 | Filter for fibrous suspensions |
JP2002564186A JP2004522869A (en) | 2001-02-15 | 2002-02-14 | Filter for fibrous suspension |
EP02724167A EP1360371A1 (en) | 2001-02-15 | 2002-02-14 | Filter for fibrous suspensions |
US10/467,917 US20040065600A1 (en) | 2001-02-15 | 2002-02-14 | Filter for fibrous suspensions |
NO20033496A NO20033496L (en) | 2001-02-15 | 2003-08-07 | Filter for fibrous suspensions |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2001VI000039A ITVI20010039A1 (en) | 2001-02-15 | 2001-02-15 | ROTATING FILTER FOR FIBROUS SUSPENSIONS |
ITVI2001A000039 | 2001-02-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002064884A1 true WO2002064884A1 (en) | 2002-08-22 |
Family
ID=11461540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/001548 WO2002064884A1 (en) | 2001-02-15 | 2002-02-14 | Filter for fibrous suspensions |
Country Status (9)
Country | Link |
---|---|
US (1) | US20040065600A1 (en) |
EP (1) | EP1360371A1 (en) |
JP (1) | JP2004522869A (en) |
KR (1) | KR20040010593A (en) |
CN (1) | CN1491303A (en) |
CA (1) | CA2435616A1 (en) |
IT (1) | ITVI20010039A1 (en) |
NO (1) | NO20033496L (en) |
WO (1) | WO2002064884A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1512786A2 (en) * | 2003-09-02 | 2005-03-09 | GL & V Management Hungary KFT | Rotor for screening apparatus for screening papermaking pulp |
WO2007090933A1 (en) * | 2006-02-10 | 2007-08-16 | Metso Paper Inc | Screen blade and screen for screening pulp |
WO2009040464A1 (en) * | 2007-09-28 | 2009-04-02 | Andritz Oy | Apparatus for screening fibrous suspensions |
EP2816153A1 (en) * | 2013-06-20 | 2014-12-24 | Valmet Technologies, Inc. | Drum element and screen for screening pulp |
CN110170190A (en) * | 2019-07-12 | 2019-08-27 | 阜阳市金亮涂料有限公司 | Rapid filtering device is used in a kind of processing of indoor decorative paint |
EP3663462A1 (en) * | 2018-12-03 | 2020-06-10 | Valmet Technologies Oy | A screening device and a rotor |
US20230338990A1 (en) * | 2022-04-21 | 2023-10-26 | Kadant Black Clawson Llc | Rotor with forward-swept struts for pressure screen cylinders |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITVI20040230A1 (en) * | 2004-09-29 | 2004-12-29 | Comer Spa | CLEANER PERFECTED FOR THE PURIFICATION OF FIBROUS SUSPENSIONS |
FI120978B (en) * | 2007-03-30 | 2010-05-31 | Advanced Fiber Tech Aft Trust | Rotor element for a screen device and rotor |
FI121672B (en) * | 2008-10-15 | 2011-02-28 | Advanced Fiber Tech Aft Trust | A method for manufacturing a rotor of a screening apparatus and a rotor |
CN108031168B (en) * | 2017-12-15 | 2020-09-04 | 杭州新天元织造有限公司 | Automatic fiber separation system and method for old fibers |
CN108479158B (en) * | 2018-03-28 | 2021-06-04 | 南京溧水高新产业股权投资有限公司 | Ultrahigh pressure equipment capable of automatically replacing filter screen |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3400820A (en) * | 1965-03-30 | 1968-09-10 | Bird Machine Co | Screening apparatus with rotary pulsing member |
US3953325A (en) * | 1972-09-27 | 1976-04-27 | Nelson Douglas G | Pulp screen with rotating cleaning foil |
WO1994000634A1 (en) * | 1992-06-20 | 1994-01-06 | Hermann Finckh Maschinenfabrik Gmbh & Co. | Pressure sorter for fibre suspensions |
EP0931875A1 (en) * | 1998-01-22 | 1999-07-28 | COMER S.p.A. | Improved mechanical strainer for fibrous suspension |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4919797A (en) * | 1989-02-09 | 1990-04-24 | The Black Clawson Company | Screening apparatus for paper making stock |
JP2001513580A (en) * | 1997-08-06 | 2001-09-04 | サーモ・ブラック・クローソン・インコーポレーテッド | Paper raw material sieving apparatus and method |
-
2001
- 2001-02-15 IT IT2001VI000039A patent/ITVI20010039A1/en unknown
-
2002
- 2002-02-14 EP EP02724167A patent/EP1360371A1/en not_active Withdrawn
- 2002-02-14 KR KR10-2003-7010755A patent/KR20040010593A/en active IP Right Grant
- 2002-02-14 CN CNA028049519A patent/CN1491303A/en active Pending
- 2002-02-14 WO PCT/EP2002/001548 patent/WO2002064884A1/en active IP Right Grant
- 2002-02-14 JP JP2002564186A patent/JP2004522869A/en not_active Ceased
- 2002-02-14 US US10/467,917 patent/US20040065600A1/en not_active Abandoned
- 2002-02-14 CA CA002435616A patent/CA2435616A1/en not_active Abandoned
-
2003
- 2003-08-07 NO NO20033496A patent/NO20033496L/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3400820A (en) * | 1965-03-30 | 1968-09-10 | Bird Machine Co | Screening apparatus with rotary pulsing member |
US3953325A (en) * | 1972-09-27 | 1976-04-27 | Nelson Douglas G | Pulp screen with rotating cleaning foil |
WO1994000634A1 (en) * | 1992-06-20 | 1994-01-06 | Hermann Finckh Maschinenfabrik Gmbh & Co. | Pressure sorter for fibre suspensions |
EP0931875A1 (en) * | 1998-01-22 | 1999-07-28 | COMER S.p.A. | Improved mechanical strainer for fibrous suspension |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1512786A2 (en) * | 2003-09-02 | 2005-03-09 | GL & V Management Hungary KFT | Rotor for screening apparatus for screening papermaking pulp |
EP1512786A3 (en) * | 2003-09-02 | 2005-12-07 | GL & V Management Hungary KFT | Rotor for screening apparatus for screening papermaking pulp |
WO2007090933A1 (en) * | 2006-02-10 | 2007-08-16 | Metso Paper Inc | Screen blade and screen for screening pulp |
WO2009040464A1 (en) * | 2007-09-28 | 2009-04-02 | Andritz Oy | Apparatus for screening fibrous suspensions |
US8328021B2 (en) | 2007-09-28 | 2012-12-11 | Andritz Oy | Apparatus for screening fibrous suspensions |
US8950584B2 (en) | 2007-09-28 | 2015-02-10 | Andritz Oy | Apparatus for screening fibrous suspensions |
EP2816153A1 (en) * | 2013-06-20 | 2014-12-24 | Valmet Technologies, Inc. | Drum element and screen for screening pulp |
CN104233894A (en) * | 2013-06-20 | 2014-12-24 | 维美德技术有限公司 | Drum element and screen for screening pulp, and method |
EP3663462A1 (en) * | 2018-12-03 | 2020-06-10 | Valmet Technologies Oy | A screening device and a rotor |
CN110170190A (en) * | 2019-07-12 | 2019-08-27 | 阜阳市金亮涂料有限公司 | Rapid filtering device is used in a kind of processing of indoor decorative paint |
US20230338990A1 (en) * | 2022-04-21 | 2023-10-26 | Kadant Black Clawson Llc | Rotor with forward-swept struts for pressure screen cylinders |
Also Published As
Publication number | Publication date |
---|---|
US20040065600A1 (en) | 2004-04-08 |
NO20033496D0 (en) | 2003-08-07 |
EP1360371A1 (en) | 2003-11-12 |
CA2435616A1 (en) | 2002-08-22 |
KR20040010593A (en) | 2004-01-31 |
CN1491303A (en) | 2004-04-21 |
NO20033496L (en) | 2003-09-24 |
ITVI20010039A1 (en) | 2002-08-16 |
JP2004522869A (en) | 2004-07-29 |
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