US3387708A - Paper machine screen - Google Patents

Paper machine screen Download PDF

Info

Publication number
US3387708A
US3387708A US522638A US52263866A US3387708A US 3387708 A US3387708 A US 3387708A US 522638 A US522638 A US 522638A US 52263866 A US52263866 A US 52263866A US 3387708 A US3387708 A US 3387708A
Authority
US
United States
Prior art keywords
screen
housing
chamber
outlet
foils
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
US522638A
Inventor
Salomon M Salomon
Robert W Schroeder
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.)
Beloit Corp
Original Assignee
Beloit Corp
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 Beloit Corp filed Critical Beloit Corp
Priority to US522638A priority Critical patent/US3387708A/en
Priority to US583639A priority patent/US3456793A/en
Priority to GB55036/66A priority patent/GB1161079A/en
Priority to ES0335032A priority patent/ES335032A1/en
Priority to FR91682A priority patent/FR1508609A/en
Priority to DEB90868A priority patent/DE1257546B/en
Priority to GB40698/67A priority patent/GB1188726A/en
Priority to ES345591A priority patent/ES345591A1/en
Priority to DEB94748A priority patent/DE1298868B/en
Priority to FR8712A priority patent/FR93277E/en
Application granted granted Critical
Publication of US3387708A publication Critical patent/US3387708A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • D21D5/06—Rotary screen-drums
    • 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
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • 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
    • B01D29/13—Supported filter elements
    • B01D29/23—Supported filter elements arranged for outward flow filtration
    • 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
    • B01D29/50—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 multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—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 multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B01D29/54—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 multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
    • 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
    • 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
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B01D29/908—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding provoking a tangential stream
    • 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
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
    • B01D29/945—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes for continuously discharging concentrated liquid

Definitions

  • PAPER MACHINE SCREEN Filed Jan. 24. 1966 Sheets-Sheet 2 p/zar/o/v 17 I l/47258 IN VEN T0135 Ajb lofizozz Mfiqlorzzozz fiolzer WJa/zzveal er B Y M m M, $96 A M ATTORNEYS United States Patent ()fifice 3,3873% Patented June 11, 1968 3,387,708 PAFER MACHENE SCREEN Salomon M. Salomon, Madison, and Robert W. Schroeder, Beloit, Wis., assignors to Beloit Corporation, Beloit, Wis., a corporation of Wisconsin Filed Jan. 24, 1966, Ser. No. 522,638 7 Claims.
  • a screening apparatus for screening fibrous material in liquid suspension which includes a housing having an inlet and a plurality of outlets.
  • a cylindrical screen which is constructed of inner and outer screen members spaced radially apart from one another is positioned substantially centrally within the housing. The space between the inner and outer screens forms a liquid chamber.
  • Two groups of foils are provided, one group radially outwardly of the outward screen and the other group radially inward of the inner screen for causing the desired constituent of material to pass through the inner and outer screens into the liquid chamber.
  • the liquid chamber between the screens is in fluid communication with an involute-shaped outlet port.
  • This invention relates to apparatus for screening fibrous materials suspended in liquid such as paper making stock and the like.
  • the invention has special relation to screening ap paratus embodying a vertically extending cylindrical screen having respective inner and outer screen members spaced radially apart to form a chamber therebetween for receiving material of desired consistency and delivering the material to an outlet of the screening apparatus. Furthermore, the invention has special relation to screening apparatus provided with an outlet for receiving the desired material separated from the stock and having further outlets for receiving this undesired material separated from the stock.
  • Another object of the present invention is to provide a screening apparatus for separating fibrous material and ents of material of different characteristics to different outlets of the apparatus.
  • Yet another object of the present invention is to provide a screening apparatus of the character described which provides means for supporting a perforated screen against the pressures of incoming material.
  • a feature object of the present invention is to provide screening apparatus incorporating rotating foil members radially inwardly and radially outwardly of an annular screen assembly.
  • FIGURE 1 is an elevational view which is partly broken away in vertical section to show the screening apparatus constructed in accordance with this invention.
  • FIGURE 2 is a planned view of the apparatus shown in FIGURE 1, with a portion of the top cover broken away.
  • the screening apparatus 10 includes a base 11 supporting a main body 12 of substantially cylindrical configuration.
  • An inlet 14 is provided near the upper portion of the body 12 for receiving a supply of fibrous material suspended in liquid such as paper stock.
  • the material is delivered to a chamber 15 within the housing 12 whereupon the desired constituent of the material passes through a screen member 16 and is collected by an outlet receiving chamber 17.
  • the annular screen member 16, an annular screen member 18, a support member 19 disposed between the screen members 16 and 18 and a ring assembly 24 are constructed to form a cylindrical screen assembly 22 as seen in FIG- URES 1 and 2.
  • the cylindical screen assembly 22 has the form of a tube having a hollow space between the inner and outer walls of the tube. That is, the cylindrical screen member 16 is placed concentrically about the cylindrical screen member 18 and spaced radially therefrom by the ring 20.
  • the support member 19 serves to support the screen members 16 and 18 against the pressure exerted thereon by the incoming material. Material will fill the chamber 15 and flow over the cylindrical screen assembly 22 to fill a chamber 25 located radially inwardly of the screen assembly 22. Therefore, the desired constituent of material, which is carried over into chamber 25, will pass through the screen 18 and is collected in the receiving chamber 17, as seen in FIGURE 1. The desired constituent of material collected in the receiving chamber 17 is then delivered to a main outlet 27.
  • the heaviest undesired constituent of the material is separated by a plurality of actions but chieiiy by centrifugal force and is collected in a receiving chamber 28 whereupon this undesired constituent of the material is delivered to an outlet 29. Still a further undesired constituent of the material, which is heavier than the desired constituent of material, is separated by gravitational means and falls to the bottom of chamber 15.
  • the bottom of chamber 15 forms a trough 39.
  • An outlet 31 communicates with the trough 30 for receiving the undesired material collected thereby.
  • Another trough 33 is located at the bottom of chamber 25 for collecting the constituent of material unacceptable to the process and which is carried over the top of the screen assembly 22.
  • An outlet 34 communicates with the trough 33 for receiving the undesired constituent of material collected thereby.
  • One or more rotatable foils 35 extend axially of the screen assembly 22 and radially outwardly thereof and immediately adjacent thereto as indicated by the dotted lines shown in FIGURE 1.
  • a plurality of foils 35 are spaced equally apart around the periphery of the screen assembly 22.
  • the foils 35 are rotated to clean the surface of the screen member 16 of materials which would otherwise clog the screen.
  • Some of the undesired constituents of the material which are removed from the screen members 16 will fall to the bottom of the chamber 15 into trough 30' and be removed by outlet 31, and some of the undesired member 18 which would otherwise clog the screen. This undesired constituent of material is ultimately collected within the trough 33 and removed via outlet 34.
  • FIGURES 1 and 2 A better understanding of the detailed construction of the screening apparatus shown in FIGURES 1 and 2 can be had by reference to the following description.
  • the housing 12 consists of an upper portion 43 and a lower portion 41' which are fastened together by a plurality of screws 42 engaging flanges 43 and 44 of the upper and lower portions 46 and 41 respectively.
  • the receiving chamber 17, which communicates with the main outlet 27, is formed by an involute 45 which has the major diameter thereof at the outlet 27, as seen in FIGURE 1.
  • An opening 46 is provided in one side of the involute 45 in a plane perpendicular to the axis thereof and concentric therewith. The opening 46 is in direct communication with the space between the screen members 16 and 18 of the screen assembly 22.
  • a support member 48 is formed concentrically and integrally within the lower portion 41 and extends upwardly within the upper portion 4i). Located concentrically within the support member 53 is a sleeve 4-9. A shaft '56 is journalled by bearin s 51, 52, 53 and 54 which are carried within the sleeve 49. Retainer caps 56 and 57 are secured respectively to the upper and lower ends of the sleeve 49 for retaining the bearings 51, 52, 53 and 54 and the shaft therein. A cover 6'3 is secured to the upper end of the support member 48, and a seal 61 is carried between the shaft 5%) and the cover 68.
  • a hub 54 is removably connected to the upper end of a the shaft 50 and is prevented from rotating relative thereto by a key 65.
  • a contoured nut 66 threadably engages the shaft 50 to retain the hub 64.
  • One or more arms 68 extend outwardly from a ring 69 which is secured to the hub 64.
  • Each of the arms 68 serves to carry one of the foils 35, as seen in FIGURE 1.
  • Also connected to the ring 69 are one or more arms '76, and each of the arms 7% serves to carry one or" the foils '37. It will be understood that each of the foils 35 or 37 may be fixedly connected to their associated arm or may be removably connected thereto.
  • the foils 35 have bosses 72 which engage a stiffener ring '73 located radially outwardly of the foils.
  • the ring 73 is connected to all of the foils 35 and serves to prevent the foils 35 from flexing axially thereby causing a gap beween the foil 35 and the bottom portion of the screen member 1%.
  • the foils 37 have bosses 75 which are connected to a stiffener ring 76 radially inwardly of the foils 37.
  • the ring 77 has substantially the same function as the ring 73.
  • the top portion 46 of the housing 12 is provided with an inlet passage 80 which is formed as an involute as best seen in FIGURE 2.
  • the involute St has an opening on the inside arcuate portion thereof communicating with the interior of the housing 12 for delivering the material to be screened to the interior of the housing 12.
  • a cover 82 is secured to the upper portion 49 of the housing 12 by a plurality of studs 83 and nuts 84-.
  • a threaded fitting 85 is provided on the cover 82 and may be connected to suitable piping means.
  • the lower end of the shaft 50 extends into a space within the base 11 and is connected to a multiple V-belt pulley 89.
  • the pulley S9 is rotated by a plurality of belts 93 which are connected to a suitable power source.
  • the housing '12 may have a plurality of outlets for receiving undesired constituents of material that is delivered to the outlet 2. Furthermore, the housing 12 may have a plurality of outlets around the housing to receive the undesired constituent of material which is received by the outlet Sl. Similarly, the housing 12 may have a plurality of outlets in communication with the chamber 25 for receiving the undesired constituents of material therefrom.
  • the housing 12 may be provided with water dilution means as indicated by arrow 95.
  • the water dilution is introduced into the chamber 15 in a direction substantially tangential to the direction of rotation of the foils 35 and 37.
  • the Water dilution means indicated by arrow 95 is provided with a valve 6 for controlling the quantity of water which is to be added to the chamber 15.
  • Water dilution means may be connected to the chamber 25 as indicated by the arrow 97.
  • a valve $8 is connected to the water dilution means for controlling the quantity of water delivered to the chamber 25.
  • the size of the apertures in screen 16 may be different than the size of the apertures in the screen 18.
  • the constituents of the material can flow inward or outward of the screen assembly 22.
  • the preferred embodiment of the present invention provides means, for separating the desired constituent of a material and delivering the desired constituent to a main outlet and which delivers the undesired constituent of the material to one or more different outlets.
  • the invention shows an improved screening apparatus whereby the material to be screened passes through screen members which are disposed concentric one within the other to form an annularly shaped cylindrical chamber between the inner and outer screened members.
  • the inner and outer screened members are spaced radially apart by means of a support spacer which, in conjunction with the inner and outer screen members, forms the screen assembly.
  • a screening apparatus of the character described for screening fibrous material in liquid suspensions to deliver the desired constituent of the materials at an outlet of the apparatus and to remove the undesired constituent of material comprising,
  • a housing having a plurality of openings defining a single inlet and a multiplicity of outlets
  • a cylindrical screen having respective inner and outer screen members spaced radial y apart to form a chamber therebetween which is disposed concentrically within said housing,
  • first and second foil means concentrically rotatably carried within said housing adjacent said inner and outer screen menroers respectively for preventing clogging of said screen members
  • a screening apparatus of the character described for screening fibrous material in liquid suspensions to deliver the desired constituent of the material at an outlet of the apparatus and to reject the undesired constituents of the material according to different characteristics at respective different outlets of the apparatus comprising,
  • a housing having a plurality of openings defining a single imet and first, second, third and fourth outlets
  • said involute having a portion extending outwardly from said housing to form said first outlet
  • trough means disposed within said housing radially outwardly of said cylindrical screen and communicating with said second outlet for removing undesired constituents which are collected in said trough means
  • receiving means formed within said housing outwardly of said cylindrical screen for receiving the material to be separated
  • said receiving means communicating with said third outlet
  • trough means disposed within said housing radially inwardly of said cylindrical screen for communicating with said fourth outlet.
  • a screening apparatus of the character described for screening fibrous material in liquid suspensions to deliver the desired constituent of material at an outlet of the apparatus and to remove the undesired constituents of material according to different characteristics at respective different outlets of the apparatus comprising,
  • a housing having a plurality of openings defining a single inlet and first, second, third and fourth outlets,
  • a cylindrical screen having respective inner and outer screen members separated radially apart to form a chamber therebetween which is disposed concentrically within said housing
  • a first involute formed within said housing and substantially concentric therewith having an opening on one side thereof in a plane perpendicular to its axis for communication with the chamber formed by said cylindrical screen
  • said involute havin a portion extending outwardly from said housing to form said first outlet
  • a trough disposed concentrically within said housing radially outwardly of said cylindrical screen for communication with said inlet at an upper axial extent of said housing and for communicating with said second outlet at a lower axial extent of said housing,
  • a trough disposed within said housing radially inwardly of said cylindrical screen for communicating with said fourth outlet
  • first and second foil means concentrically rotatably carried within said housing adjacent said inner and outer screen members respectively
  • a screening device comprising,
  • a first involute for-med within said housing and substantially concentric therewith having an opening on one side thereof in a plane perpendicular to its axes for communicating with the chamber formed by said cylindrical screen
  • inner and outer foils positioned radially inwardly of the inner screen and radially outwardly of the outer screen for rotating past the screens
  • a housing defining a first chamber radially outwardly of the outer screen and a second chamber radially inwardly of the inner screen with the chambers communicating over the top of the screens
  • reject outlet means at the lower portion of said first and second chambers for removing particles screened from the stock.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Description

June 11, 1968 s SALOMON ET AL 3,387,708
PAPER MACHINE SCREEN 2 Sheets$heet 1 Filed Jan. 24, 1966 I N VEN TORS fia lomozz Mfiajomozz Wfiamoe r 44 Y MORNEYS EOberZ June 11, 1968 s SALOMON ET AL 3,387,708
PAPER MACHINE SCREEN Filed Jan. 24. 1966 2 Sheets-Sheet 2 p/zar/o/v 17 I l/47258 IN VEN T0135 Ajb lofizozz Mfiqlorzzozz fiolzer WJa/zzveal er B Y M m M, $96 A M ATTORNEYS United States Patent ()fifice 3,3873% Patented June 11, 1968 3,387,708 PAFER MACHENE SCREEN Salomon M. Salomon, Madison, and Robert W. Schroeder, Beloit, Wis., assignors to Beloit Corporation, Beloit, Wis., a corporation of Wisconsin Filed Jan. 24, 1966, Ser. No. 522,638 7 Claims. (Cl. 209-273) ABSTRACT OF THE DESCLOSURE A screening apparatus for screening fibrous material in liquid suspension which includes a housing having an inlet and a plurality of outlets. A cylindrical screen which is constructed of inner and outer screen members spaced radially apart from one another is positioned substantially centrally within the housing. The space between the inner and outer screens forms a liquid chamber. Two groups of foils are provided, one group radially outwardly of the outward screen and the other group radially inward of the inner screen for causing the desired constituent of material to pass through the inner and outer screens into the liquid chamber. The liquid chamber between the screens is in fluid communication with an involute-shaped outlet port.
This invention relates to apparatus for screening fibrous materials suspended in liquid such as paper making stock and the like.
The invention has special relation to screening ap paratus embodying a vertically extending cylindrical screen having respective inner and outer screen members spaced radially apart to form a chamber therebetween for receiving material of desired consistency and delivering the material to an outlet of the screening apparatus. Furthermore, the invention has special relation to screening apparatus provided with an outlet for receiving the desired material separated from the stock and having further outlets for receiving this undesired material separated from the stock.
It is a primary object of the present invention to provide a screening apparatus of the above type which will effectively and efficiently screen fibrous material suspended in liquid and which is particularly useful in screening paper stock of dirt particles, bark, slivers and other undesirable material.
Another object of the present invention is to provide a screening apparatus for separating fibrous material and ents of material of different characteristics to different outlets of the apparatus.
Yet another object of the present invention is to provide a screening apparatus of the character described which provides means for supporting a perforated screen against the pressures of incoming material.
A feature object of the present invention is to provide screening apparatus incorporating rotating foil members radially inwardly and radially outwardly of an annular screen assembly.
Other objects and added features and advantages will become manifest to those versed in the art upon making reference to the description and drawings which follow in which an embodiment of this invention is shown by way of illustrative example.
FIGURE 1 is an elevational view which is partly broken away in vertical section to show the screening apparatus constructed in accordance with this invention; and
FIGURE 2 is a planned view of the apparatus shown in FIGURE 1, with a portion of the top cover broken away.
Referring to the drawings, which illustrate a preferred embodiment of the invention, the screening apparatus shown in FIGURES 1 and 2 is designated generally by a reference numeral 10. The screening apparatus 10 includes a base 11 supporting a main body 12 of substantially cylindrical configuration. An inlet 14 is provided near the upper portion of the body 12 for receiving a supply of fibrous material suspended in liquid such as paper stock. The material is delivered to a chamber 15 within the housing 12 whereupon the desired constituent of the material passes through a screen member 16 and is collected by an outlet receiving chamber 17. The annular screen member 16, an annular screen member 18, a support member 19 disposed between the screen members 16 and 18 and a ring assembly 24 are constructed to form a cylindrical screen assembly 22 as seen in FIG- URES 1 and 2. The cylindical screen assembly 22 has the form of a tube having a hollow space between the inner and outer walls of the tube. That is, the cylindrical screen member 16 is placed concentrically about the cylindrical screen member 18 and spaced radially therefrom by the ring 20.
The support member 19 serves to support the screen members 16 and 18 against the pressure exerted thereon by the incoming material. Material will fill the chamber 15 and flow over the cylindrical screen assembly 22 to fill a chamber 25 located radially inwardly of the screen assembly 22. Therefore, the desired constituent of material, which is carried over into chamber 25, will pass through the screen 18 and is collected in the receiving chamber 17, as seen in FIGURE 1. The desired constituent of material collected in the receiving chamber 17 is then delivered to a main outlet 27.
The heaviest undesired constituent of the material is separated by a plurality of actions but chieiiy by centrifugal force and is collected in a receiving chamber 28 whereupon this undesired constituent of the material is delivered to an outlet 29. Still a further undesired constituent of the material, which is heavier than the desired constituent of material, is separated by gravitational means and falls to the bottom of chamber 15. The bottom of chamber 15 forms a trough 39. An outlet 31 communicates with the trough 30 for receiving the undesired material collected thereby. Another trough 33 is located at the bottom of chamber 25 for collecting the constituent of material unacceptable to the process and which is carried over the top of the screen assembly 22. An outlet 34 communicates with the trough 33 for receiving the undesired constituent of material collected thereby.
One or more rotatable foils 35 extend axially of the screen assembly 22 and radially outwardly thereof and immediately adjacent thereto as indicated by the dotted lines shown in FIGURE 1. In the preferred embodiment of the present invention a plurality of foils 35 are spaced equally apart around the periphery of the screen assembly 22. The foils 35 are rotated to clean the surface of the screen member 16 of materials which would otherwise clog the screen. Some of the undesired constituents of the material which are removed from the screen members 16 will fall to the bottom of the chamber 15 into trough 30' and be removed by outlet 31, and some of the undesired member 18 which would otherwise clog the screen. This undesired constituent of material is ultimately collected within the trough 33 and removed via outlet 34.
A better understanding of the detailed construction of the screening apparatus shown in FIGURES 1 and 2 can be had by reference to the following description.
The housing 12 consists of an upper portion 43 and a lower portion 41' which are fastened together by a plurality of screws 42 engaging flanges 43 and 44 of the upper and lower portions 46 and 41 respectively. The receiving chamber 17, which communicates with the main outlet 27, is formed by an involute 45 which has the major diameter thereof at the outlet 27, as seen in FIGURE 1. An opening 46 is provided in one side of the involute 45 in a plane perpendicular to the axis thereof and concentric therewith. The opening 46 is in direct communication with the space between the screen members 16 and 18 of the screen assembly 22.
A support member 48 is formed concentrically and integrally within the lower portion 41 and extends upwardly within the upper portion 4i). Located concentrically within the support member 53 is a sleeve 4-9. A shaft '56 is journalled by bearin s 51, 52, 53 and 54 which are carried within the sleeve 49. Retainer caps 56 and 57 are secured respectively to the upper and lower ends of the sleeve 49 for retaining the bearings 51, 52, 53 and 54 and the shaft therein. A cover 6'3 is secured to the upper end of the support member 48, and a seal 61 is carried between the shaft 5%) and the cover 68.
A hub 54 is removably connected to the upper end of a the shaft 50 and is prevented from rotating relative thereto by a key 65. A contoured nut 66 threadably engages the shaft 50 to retain the hub 64. One or more arms 68, indicated by dotted lines in FIGURE 1, extend outwardly from a ring 69 which is secured to the hub 64. Each of the arms 68 serves to carry one of the foils 35, as seen in FIGURE 1. Also connected to the ring 69 are one or more arms '76, and each of the arms 7% serves to carry one or" the foils '37. It will be understood that each of the foils 35 or 37 may be fixedly connected to their associated arm or may be removably connected thereto.
The foils 35 have bosses 72 which engage a stiffener ring '73 located radially outwardly of the foils. The ring 73 is connected to all of the foils 35 and serves to prevent the foils 35 from flexing axially thereby causing a gap beween the foil 35 and the bottom portion of the screen member 1%. The foils 37 have bosses 75 which are connected to a stiffener ring 76 radially inwardly of the foils 37. The ring 77 has substantially the same function as the ring 73.
The top portion 46 of the housing 12 is provided with an inlet passage 80 which is formed as an involute as best seen in FIGURE 2. The involute St) has an opening on the inside arcuate portion thereof communicating with the interior of the housing 12 for delivering the material to be screened to the interior of the housing 12.
A cover 82 is secured to the upper portion 49 of the housing 12 by a plurality of studs 83 and nuts 84-. A threaded fitting 85 is provided on the cover 82 and may be connected to suitable piping means.
The lower end of the shaft 50 extends into a space within the base 11 and is connected to a multiple V-belt pulley 89. The pulley S9 is rotated by a plurality of belts 93 which are connected to a suitable power source.
Although the specific embodiment of the present invention shows single outlets 29, 31 and 34, it is not to be construed in the limiting sense. The housing '12 may have a plurality of outlets for receiving undesired constituents of material that is delivered to the outlet 2. Furthermore, the housing 12 may have a plurality of outlets around the housing to receive the undesired constituent of material which is received by the outlet Sl. Similarly, the housing 12 may have a plurality of outlets in communication with the chamber 25 for receiving the undesired constituents of material therefrom.
As seen in FIGURE 2, the housing 12 may be provided with water dilution means as indicated by arrow 95. The water dilution is introduced into the chamber 15 in a direction substantially tangential to the direction of rotation of the foils 35 and 37. The Water dilution means indicated by arrow 95 is provided with a valve 6 for controlling the quantity of water which is to be added to the chamber 15. Water dilution means may be connected to the chamber 25 as indicated by the arrow 97. A valve $8 is connected to the water dilution means for controlling the quantity of water delivered to the chamber 25.
Furthermore, the size of the apertures in screen 16 may be different than the size of the apertures in the screen 18. By using screens having different sized apertures one from the other, the constituents of the material can flow inward or outward of the screen assembly 22.
It will be noted that the rotating foils 35 and 37 at no time pass over the outlet openings of the housing 12. Also, the rotating foils 35 and 37 at no time pass over the inlet opening 14 of the housing 12. This will allow the inlet opening 14 to be moved upwardly as seen-in PIG- URE 1 if necessary. Furthermore, this feature decreases the amplitude of pulsations of the material delivered to the inlet l4.
It can be seen, therefore, that the preferred embodiment of the present invention provides means, for separating the desired constituent of a material and delivering the desired constituent to a main outlet and which delivers the undesired constituent of the material to one or more different outlets. Specifically, the invention shows an improved screening apparatus whereby the material to be screened passes through screen members which are disposed concentric one within the other to form an annularly shaped cylindrical chamber between the inner and outer screened members. The inner and outer screened members are spaced radially apart by means of a support spacer which, in conjunction with the inner and outer screen members, forms the screen assembly.
Although a specific embodiment of the invention has been described herein, it is not intended to limit the invention solely thereto, but to include all of the obvious variations and modifications within the spirit and scope of the appended claims.
We claim as our invention:
1. In a screening apparatus of the character described for screening fibrous material in liquid suspensions to deliver the desired constituent of the materials at an outlet of the apparatus and to remove the undesired constituent of material comprising,
a housing having a plurality of openings defining a single inlet and a multiplicity of outlets,
a cylindrical screen having respective inner and outer screen members spaced radial y apart to form a chamber therebetween which is disposed concentrically within said housing,
means connecting said chamber formed by said cylindrical screen to one of said outlets for passing the desired constituent of material,
the other of said outlets communicating with the area radially inside and outside of said screen,
first and second foil means concentrically rotatably carried within said housing adjacent said inner and outer screen menroers respectively for preventing clogging of said screen members, and
drive means for driving said first and second foils within said housing.
2. In a screening apparatus of the character described for screening fibrous material in liquid suspensions to deliver the desired constituent of the material at an outlet of the apparatus and to reject the undesired constituents of the material according to different characteristics at respective different outlets of the apparatus comprising,
a housing having a plurality of openings defining a single imet and first, second, third and fourth outlets,
a cylindrical screen having respective inner and outer screen members spaced radially apart to form a chamber therebetween which is disposed concentrically within said housing,
an involute formed Within said housing and substantially concentric therewith having an opening on one side thereof in a plane perpendicular to its axes for communication with the chamber formed by said cylindrical screen,
said involute having a portion extending outwardly from said housing to form said first outlet,
trough means disposed within said housing radially outwardly of said cylindrical screen and communicating with said second outlet for removing undesired constituents which are collected in said trough means,
receiving means formed within said housing outwardly of said cylindrical screen for receiving the material to be separated,
said receiving means communicating with said third outlet, and
trough means disposed within said housing radially inwardly of said cylindrical screen for communicating with said fourth outlet.
3. In a screening apparatus of the character described for screening fibrous material in liquid suspensions to deliver the desired constituent of material at an outlet of the apparatus and to remove the undesired constituents of material according to different characteristics at respective different outlets of the apparatus comprising,
a housing having a plurality of openings defining a single inlet and first, second, third and fourth outlets,
a cylindrical screen having respective inner and outer screen members separated radially apart to form a chamber therebetween which is disposed concentrically within said housing,
a first involute formed within said housing and substantially concentric therewith having an opening on one side thereof in a plane perpendicular to its axis for communication with the chamber formed by said cylindrical screen,
said involute havin a portion extending outwardly from said housing to form said first outlet,
a trough disposed concentrically within said housing radially outwardly of said cylindrical screen for communication with said inlet at an upper axial extent of said housing and for communicating with said second outlet at a lower axial extent of said housing,
a second involute formed within said housing radially outwardly of said cylindrical screen and substantially concentric therewith having a portion of said involute extending outwardly of said housing to form said inlet,
a portion of said second involute communicating with said third outlet for receiving particles which are centrifugally separated from the material,
a trough disposed within said housing radially inwardly of said cylindrical screen for communicating with said fourth outlet,
first and second foil means concentrically rotatably carried within said housing adjacent said inner and outer screen members respectively, and
drive means for driving said first and second foil means within said housing 4. A screening device comprising,
a housing,
an inlet connected to said housing for receiving material in liquid suspension to be separated,
a cylindrical screen having respective inner and outer screen members spaced radially apart to form a chamber therebetween which is disposed concentrically within said housing,
a first involute for-med within said housing and substantially concentric therewith having an opening on one side thereof in a plane perpendicular to its axes for communicating with the chamber formed by said cylindrical screen,
said first involute communicating with a first outlet,
at second outlet connected to said housing for receiving undesired particles of the material which settles to the bottom of said housing radially outwardly of said cylindrical screen,
a third outlet connected to said housing for receiving particles which are centrifugally separated from said material,
comprising in combination,
an outer vertical annular screen,
an inner vertical annular screen of smaller diameter defining a stock receiving chamber therebetween,
an outlet conduit means communicating with said stock receiving chamber and receiving screened stock,
inner and outer foils positioned radially inwardly of the inner screen and radially outwardly of the outer screen for rotating past the screens,
a housing defining a first chamber radially outwardly of the outer screen and a second chamber radially inwardly of the inner screen with the chambers communicating over the top of the screens,
a stock inlet communicating with the first chamber with heavier particles dropping down beside the outer screen and a portion of the stock flowing through the outer screen into the chamber between the screens with the remainder of the stock flowing over the top of the screens into the second chamber, and
reject outlet means at the lower portion of said first and second chambers for removing particles screened from the stock.
6. A stock screening mechanism in accordance with claim 5 wherein said foils are mounted on a common central rotor coaxial with the screens for moving the foils in rotation.
7. The screening apparatus of claim 5 wherein said reject outlet means comprises a plurality of individual outlets.
References Cited UNITED STATES PATENTS 1,647,799 11/1927 Hammer 210342 2,276,118 3/1942 Taylor 2103 15 3,029,951 4/1962 Cannon 209-273 X 3,149,067 9/1964 Cannon et al 210-415 X 3,159,572 12/1964 Ranhagen 209 273 3,174,622 3/1965 :lamort 209 273 3,211,292 10/1965 Bull 210-342 3,223,239 12/1965 Dick 209-273 X 3,232,436 2/1966 Nilsson 210 414 X 3,261,468 7/1966 Dick 209273 X HARRY B. THORNTON, Primary Examiner.
TIM R. MILES, Examiner.
US522638A 1966-01-24 1966-01-24 Paper machine screen Expired - Lifetime US3387708A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US522638A US3387708A (en) 1966-01-24 1966-01-24 Paper machine screen
US583639A US3456793A (en) 1966-01-24 1966-10-03 Dual pressure stock screen
GB55036/66A GB1161079A (en) 1966-01-24 1966-12-08 Screening Apparatus for Screening Fibrous Material in Liquid Suspension.
ES0335032A ES335032A1 (en) 1966-01-24 1966-12-28 Make paper machine. (Machine-translation by Google Translate, not legally binding)
FR91682A FR1508609A (en) 1966-01-24 1967-01-18 scrubber for paper machine
DEB90868A DE1257546B (en) 1966-01-24 1967-01-24 Sieving machine for slurries, especially pulp suspensions
GB40698/67A GB1188726A (en) 1966-01-24 1967-09-06 Screening Apparatus
ES345591A ES345591A1 (en) 1966-01-24 1967-09-29 Dual pressure stock screen
DEB94748A DE1298868B (en) 1966-01-24 1967-09-30 Sieving machine for slurries, especially pulp suspensions
FR8712A FR93277E (en) 1966-01-24 1967-10-03 Scrubber for paper machine.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US522638A US3387708A (en) 1966-01-24 1966-01-24 Paper machine screen

Publications (1)

Publication Number Publication Date
US3387708A true US3387708A (en) 1968-06-11

Family

ID=24081687

Family Applications (1)

Application Number Title Priority Date Filing Date
US522638A Expired - Lifetime US3387708A (en) 1966-01-24 1966-01-24 Paper machine screen

Country Status (5)

Country Link
US (1) US3387708A (en)
DE (1) DE1257546B (en)
ES (1) ES335032A1 (en)
FR (1) FR1508609A (en)
GB (1) GB1161079A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3456793A (en) * 1966-01-24 1969-07-22 Beloit Corp Dual pressure stock screen
US3471022A (en) * 1967-07-19 1969-10-07 Robert Conrad Swimming pool filter
US3497060A (en) * 1968-02-22 1970-02-24 Voith Gmbh J M Separator for fiber suspension
US3499528A (en) * 1968-05-21 1970-03-10 Beloit Corp Pressurized knotter screen
US3672506A (en) * 1970-05-06 1972-06-27 Jylhavaara Osakeyhtio Pressure strainer device
US3785495A (en) * 1971-08-16 1974-01-15 Finckh H Metalltuch Maschfab Pressure filter for fibrous suspensions
US4043919A (en) * 1975-06-14 1977-08-23 Hermann Finckh Maschinenfabrik Pressure screen with turbulence chamber means
US4126513A (en) * 1977-06-30 1978-11-21 Beloit Corporation Air dome attenuator
US4324820A (en) * 1980-07-18 1982-04-13 St. Regis Paper Company Method and apparatus for coating a paper web
US4842722A (en) * 1986-07-15 1989-06-27 Hermann Finckh Maschinenfabrik Gmbh & Co. Pressure sorter
US4971694A (en) * 1989-01-05 1990-11-20 Kamyr Ab Double diffuser with backflush pistons
US5954956A (en) * 1997-07-22 1999-09-21 J&L Fiber Services Modular screen cylinder and a method for its manufacture
US6138838A (en) * 1998-05-29 2000-10-31 J&L Fiber Services, Inc. Screen media and a screening passage therefore
WO2014084788A1 (en) 2012-11-28 2014-06-05 Metso Paper Sweden Ab Screening apparatus, rotor, wing package and method for manufacture

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3424919A1 (en) * 1984-07-06 1986-01-16 J.M. Voith Gmbh, 7920 Heidenheim METHOD FOR RECYCLING PAPER

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647799A (en) * 1926-03-05 1927-11-01 Forrester L Hammer Strainer
US2276118A (en) * 1939-05-10 1942-03-10 Peninsular Lurton Company Filter apparatus
US3029951A (en) * 1958-09-24 1962-04-17 Bird Machine Co Screening device
US3149067A (en) * 1962-08-23 1964-09-15 Bird Machine Co Screening device
US3159572A (en) * 1961-05-24 1964-12-01 Ranhagen Ernst Gustaf Rane Means for the straining, fractionation and concentration of solids, e. g., cellulosefibres, suspended in a liquid
US3174522A (en) * 1961-08-21 1965-03-23 Larentis Albano Nut locking device
US3211292A (en) * 1963-10-21 1965-10-12 Michigan Dynamics Inc Strainer with concentric filter elements
US3223239A (en) * 1962-05-11 1965-12-14 Bird Machine Co Pressure type screening devices
US3232436A (en) * 1961-02-09 1966-02-01 Nilsson Nils Gunnar Holger Straining apparatuses
US3261468A (en) * 1963-05-17 1966-07-19 Bird Machine Co Screen cleaning device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647799A (en) * 1926-03-05 1927-11-01 Forrester L Hammer Strainer
US2276118A (en) * 1939-05-10 1942-03-10 Peninsular Lurton Company Filter apparatus
US3029951A (en) * 1958-09-24 1962-04-17 Bird Machine Co Screening device
US3232436A (en) * 1961-02-09 1966-02-01 Nilsson Nils Gunnar Holger Straining apparatuses
US3159572A (en) * 1961-05-24 1964-12-01 Ranhagen Ernst Gustaf Rane Means for the straining, fractionation and concentration of solids, e. g., cellulosefibres, suspended in a liquid
US3174522A (en) * 1961-08-21 1965-03-23 Larentis Albano Nut locking device
US3223239A (en) * 1962-05-11 1965-12-14 Bird Machine Co Pressure type screening devices
US3149067A (en) * 1962-08-23 1964-09-15 Bird Machine Co Screening device
US3261468A (en) * 1963-05-17 1966-07-19 Bird Machine Co Screen cleaning device
US3211292A (en) * 1963-10-21 1965-10-12 Michigan Dynamics Inc Strainer with concentric filter elements

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3456793A (en) * 1966-01-24 1969-07-22 Beloit Corp Dual pressure stock screen
US3471022A (en) * 1967-07-19 1969-10-07 Robert Conrad Swimming pool filter
US3497060A (en) * 1968-02-22 1970-02-24 Voith Gmbh J M Separator for fiber suspension
US3499528A (en) * 1968-05-21 1970-03-10 Beloit Corp Pressurized knotter screen
US3672506A (en) * 1970-05-06 1972-06-27 Jylhavaara Osakeyhtio Pressure strainer device
US3785495A (en) * 1971-08-16 1974-01-15 Finckh H Metalltuch Maschfab Pressure filter for fibrous suspensions
US4043919A (en) * 1975-06-14 1977-08-23 Hermann Finckh Maschinenfabrik Pressure screen with turbulence chamber means
US4126513A (en) * 1977-06-30 1978-11-21 Beloit Corporation Air dome attenuator
US4324820A (en) * 1980-07-18 1982-04-13 St. Regis Paper Company Method and apparatus for coating a paper web
US4842722A (en) * 1986-07-15 1989-06-27 Hermann Finckh Maschinenfabrik Gmbh & Co. Pressure sorter
US4971694A (en) * 1989-01-05 1990-11-20 Kamyr Ab Double diffuser with backflush pistons
US5954956A (en) * 1997-07-22 1999-09-21 J&L Fiber Services Modular screen cylinder and a method for its manufacture
US6138838A (en) * 1998-05-29 2000-10-31 J&L Fiber Services, Inc. Screen media and a screening passage therefore
US6745469B1 (en) 1998-05-29 2004-06-08 J&L Fiber Services, Inc. Method of making screen media and a screening passage therefore
WO2014084788A1 (en) 2012-11-28 2014-06-05 Metso Paper Sweden Ab Screening apparatus, rotor, wing package and method for manufacture
CN104769181A (en) * 2012-11-28 2015-07-08 维美德公司 Screening apparatus, rotor, wing package and method for manufacture
EP2925927A4 (en) * 2012-11-28 2016-07-06 Valmet Oy Screening apparatus, rotor, wing package and method for manufacture
US9410286B2 (en) 2012-11-28 2016-08-09 Valnet AB Screening apparatus, rotor, wing package and method for manufacture
CN104769181B (en) * 2012-11-28 2016-08-24 维美德公司 The encapsulation of screening installation, rotor, aerofoil profile and manufacture method

Also Published As

Publication number Publication date
ES335032A1 (en) 1967-11-16
GB1161079A (en) 1969-08-13
FR1508609A (en) 1968-01-05
DE1257546B (en) 1967-12-28

Similar Documents

Publication Publication Date Title
US3387708A (en) Paper machine screen
US3437204A (en) Screening apparatus
US3223239A (en) Pressure type screening devices
US3713536A (en) Pressure pulp screen
US4107033A (en) Apparatus for cleaning fibrous suspensions of low stock consistency
FI70058B (en) FOERFARANDE FOER SORTERING AV FIBERSUSPENSIONER SAMT TRYCKSORTERARE FOER UTFOERANDE AV FOERFARANDET
US4634521A (en) Screening apparatus with light reject removal
US5009774A (en) Pulseless screen
US3456793A (en) Dual pressure stock screen
US4067800A (en) Screening apparatus
US4085776A (en) Flow divider
US4328096A (en) Dual flow screening apparatus
US5443737A (en) Rotary drum with radial spray jets
US5119953A (en) Pulp suspension screening and fractionation apparatus
US2808201A (en) Centrifugal machine for separating and clarifying liquids
US3247965A (en) Vertical centrifugal screen for pulp stock
US3399772A (en) Duplex pulp screen
US3874509A (en) Pressure screen and surge tank
CA1163236A (en) Dual flow screening apparatus
US2293398A (en) Apparatus for separating materials
US3616904A (en) Apparatus for treating discrete materials
KR840000020B1 (en) Screening apparatus
US3499528A (en) Pressurized knotter screen
EP0020145B1 (en) Multiple hydrocyclone separator
NO145665B (en) PRESSURE FOR CELLULOSE AND TREMASS.