US1134304A - Pulp-screen. - Google Patents

Description

P. P. WESTBYE. PULP SCREEN.

MFPLICATION FILED MAY IT, l8l2- 1,3184 Patented Apr. 6,1915.

5 SHBETS-SHEET 1.

P. P. WESTBYE.

PULP SCREEN.

APPLICATION nuzn MAY 17, 1912.

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Patented Apr. 6, 1915.

5 SHEETS-SHEET Z.

P. P. WESTBYL PULP SCREEN.

APPLICATION FILED MAY 17. 19I2. 1, 1L 3%,8WL O Patented Apr. 6, 1915.

5 SHEETS-SHEET 3. E 4r W WHIHIH" |||||||||H \IH P. P. WESTBYE.

PULP SCREEN.

APPLICATION FILED ram/17.1912.

Patented Apr. 6, 1915 5 SHEETSSHEBT 4.

@582? 3% am I v v m w 1,18%SUQO P. P. WESTBYE.

PULP SCREEN. I APPLICATION FILED MAY. 19I2.

Patented Apr. 6, 1915.

5 SHEETS-SHEBT 5.

aH'o z/neq Ll8304n l Vi ma P. OF EE TERBOROUGH, ONTARIO, CANADA.

ULP-sonnets.

man a Specification of Letters Patent.

Patented A r. a, rats.

Application filed may 17, 1.91.2 Serial No. 698,070.

T all whom it may concern Be it known that I, Pnorm P. WET BY1E, a subject of the King of Norway, residing at Peter-borough, in the county of Peterborough and Province of Ontario, Canada, have invented certain new and useful Improvements in Pulp-Screens, of which the following is a specification My invention relates to paper making machinery and particularly to pulp screens of the vertical type adapted to separate fine fibrous or usable portions of the pulp from the coarse or unusable portions thereof.

The pulp screen, forming the sub eot matter hereof, is of that type employing an annular perforated screen within which is mounted a revoluble distributer operating to discharge the pulp by centrifugal tendency against said annular screen.

The object of the invention is to simplify the structure as well as the means and mode of operation of such machines, whereby they will not only be cheapened in construct on, but will be more eflicient in use, economical in operation, easily operated and unlikely to get out of repair.

A further object of the invention is to provide improved pulp feeding means whereby the rotary distributer Wlll be supplied with pulp equally throughout 1ts circle of operation.

It has been found in practice that in screens of this type as usually constructed the pulp is not delivered equally throughout the height of the screen but that the greater portion of the pulp is discharged at the top of the screen, while the lower portions thereof receive but a small part of the supply.

A further object of the present invention is to provide an improved form of sectional rotary distributer whereby the entire screen surface may be utilized,thereby increasing the efficiency and capacity of the machine.

It has likewise been found in practice that a considerable amount of fine fibrous or usable material adheres to the knots and slivers or other coarse material and is lost by being discharged with the tailings.

A further object of the present invention is to provide means for subjecting the coarse tailings to a supplemental separating operation whereby the adhering usable material will be saved. Inasmuch as a high speed of rotation is desirable in' order that the pulp may be forcibly projected against the annular screen, a furt er object of the invention is to provide an auxiliary accelerating means for the revoluble distributer.

Wlth the above primary and other incidental objects in view as will more fully appear in the specification, the invention consists of the features of construction, the parts and combinations thereof and the mode of operation, or their equivalents, as heremafter described and set forth in the claims.

Referring to the drawings, Figure 1 is a vertical sectional View of the assembled machine. Fig. 2 is a plan view of the assembled machine partly in section, such sections being taken at difierent heights on line m m of Fig. 1. Fig. 3 is a detail sectional V ew on line y-y of Fig. 2. Fig. 4 is a plan view of the rotary distributer removed from the machine. Fig. 5 is a side elevation thereof. Fig. 6 is a plan view partly in sections of the auxiliary distributer for reworking the tailings. Fig. 7 is a side elevation thereof. Fig. 8 is a vertical sectional view of said auxiliary distributer showing the water power accelerator. Fig. 9 is a bottom plan view of the auxiliary distributer. Fig. 10 is a side elevation of the modified form of distributer.

Like parts are indicated by similar characters of reference throughout the several views.

In constructing the machine there is provided an annular main casing or housing Within which is concentrically located a perforated plate or screen 2 separating the main chamber or housing into a central distributer chamber 3 and an annular receiving chamber 4 surrounding said screen. In order to give to the main casing or housing the necessary strength and rigidity pilasters or columns 5 are provided at different points throughout the periphery thereof. Intermediate the pilasters or columns 5 the side walls of the main housing or casing comprise removable doors or sections 6 by which access may be had to the interior of the housing. At its lower extremity the annular receiving chamber 4 terminates in a gutter or conduit 7 extending throughout the circumference of the housing and having a discharge orifice 8 through which the screened material is discharged from the machine. The inner central or distributer chamber 3 is also provided with an ofl' take conduit 9 for the discharge of the tailings comprising the knots, slivers and foreign material tto coarse to pass through the perforated plate or screen. The concentric screen 2 is divided into sections each of which'is carried upon a segmental supporting frame 11 composed of angle irons as shown in Figs. 1 and 2. At their lower extremities the screen supporting frames are grooved or recessed and engage the top edge of the inner wall of the concentric gutter or conduit 7 as shown at 12 of Fig. 1. These segmental screen frames rest upon the said inner concentric walls of the conduit '7 which walls project within the groove or recess of the segmental frame. Ad acent to their tops the segmental screen sections are supported by bifurcated arms 13 which are pivoted to lugs 14 projecting inward from the wall of the main housing. The bifurcated extremity of the arm 13 engages on opposite sides,

of the marginal flanges of a jacent screen sections as shown at 15 of Fig. 2. A clamp bolt 16 is provided in the bifurcated portion of the arms 13 by which the arms 13 are made to clamp the screen sections one to the other. By removing the door or section 6 of the main housing access may be had to the screen plate, the sections of which may be removed for examination or repairs by releasing the clamp screws 16 and turning the tions with the lugs arms 13 upward about their pivotal connec- 14, out of engagement with the supporting frame of the screen.

A portion of the main housing located above the central or distributer chamber 3 is extended upward as at 17 and provided with internal annular flanges 18 and 19 upon which rest transverse diaphragms 20 and 21 dividing such extension 17 of the main housing into two equalizing feed chambers 22 and 23. Projecting from the top surface of the diaphragm is a concentric annular flange 24 extending an equal distance above the diaphragm throughout. Projecting from the under side of the diaphragm 20 and coincident with the flange 24 is a concentric pendant sleeve 25 projecting within the distributer chamber 3 for the purpose hereinafter mentioned. The diaphragm 21 is provided with a central opening surrounded by a concentric flange 26 projecting upward from the top surface of the diaphragm. The central opening of the diaphragm 21 is of greater diameter than the sleeve 25. To provide for inspection of the equalizing feed chambers openings are provided in the diaphragm 20 and in the head 27 of the portion 17 of the main housing which openings are normally closed by covers or valves 28 and 29. For convenience the valves or covers 28 and 29 have been connected one with the other by a stem 30. A pulp supply conduit 31 discharges simultaneously into both the equalizing feed chambers 22 and 23. The diaphragm 20 is provided with an upward projecting semiannular sleeve 32 which registers with one half of the discharge orifice of the inlet conduit 31 as shown particularly in Figs. 2 and 3. This semi-annular sleeve 32 serves to conduct a portion of the supply pulp to the lower feeding chamber 23 while the remainder of the .pulp supply is discharged directly onto the diaphragm 20 which forms thebottom of the uppermost feeding chamber 22. The pulp discharged thrdugh the semi-annular sleeve 32 collects in the feeding chamber 23 until itrises to the level of the top of the concentric flanged opening whereupon it overflows the' flange 26 equally throughout its entire periphery supplying the upper section of the rotary distributer located within the distributing chamber 3 as hereinafter described. At the same time the remainder of the supply of pulp collects within the feeding chamber 22 until it overflows the upward projecting flange 24 and passes downward through the sleeve 25 to supply the lower section of said rotary distributer. The rotary distributer which serves to project the pulp forcibly against a perforated plate or screen in a lateral direction by centrifugal tendency is carried upon ed in bearings 34 and 35 and carrying at its upper extremity-a drive pulley 36.

In order that the perforated screen plate may be utilized equally throughout its full height the rotary distributer comprises two sets of radially disposed wings or vanes, the uppermost set being supplied with pulp from the feeding or equalizing chamber 23 while the lowermost set is supplied from the upper feed chamber 22. Each of the distributer sections of the rotor comprises a central conical portion 37 and 38 respectively which gradually merges at its lower extremity into a horizontal shelving portion as at 39 and 40. From these central conical bodies extend radial distributer wings or vanes 41 preferably slightly offset in relation to the axis of the distributer as clearly shown in Fig. 4. The wings or vanes ofv the upper and lower sections of the distributer are further offset in relation with each other or arranged in alternate relation as shown in Figs. 4 and 5. The wings or vanes are preferably inclined slightly in an advanced direction whereby the top of the vanes extend slightly forward of the bottom thereof. The base of-the central conical portions 39 and 40 is extended diagonally outward to meet the wings or vanes thus forming at the base of the wings a projecting lip or ledge 42. In order to further equalize the distribution of the pulp the wings or vanes may be provided with inclined ribs 43 located on the advance side of the vane or wing and inclined to the axis of rotation in a direction substantially parallel with the central conical body 37 or 38 and a centrally disposed vertical shaft 33 mountmeannealso inclinbd in relation to the wings or vanes whereby the upper portion at said rib will project a greater distance in advance at the wing or vane than the bottom These ribs are shown particularly in Figs 1 and 5. It is to be understood however that these ribs 43 may or may not be used according to the character of the material to be operated upon. The ribs 43 are not essential but for certain character of material they will be found dwirableL While the rotor has been herein shdwn described as comprising two distributer sections, it is to be understood that for a machine of small capacity a single'sst of wings may be employed, in which case but one equalizing feed chamber would be required. Likewise for a large capacity machine three or more sets of wings might be utilized, each with its corresponding feed chamber.

As before said, the supply of pulp entering through the inlet conduit 31 is divided substantially equally between the feeding chamber 22 and the feeding chamber23 substantially half of the pulp supply being discharged into the latter chamber through the inlet sleeve 32 while the remainder is discharged directly upon the diaphragm 2b. The material overflowing the concentric flange 26 from the feed chamber 23 supplies the upper section of therotary distributer equally throughout its circle of operation. At the same time the pulp from the feed chamber 22 overflowing the concentric flange 24 passes downward through the pendant sleeve 25 which projects within the central conical bodies 37 of the rotor and discharges into the lower section of the rotor causing the pulp to be supplied equally throughout the periphery thereof. The rotor which travels at a high rate of speed causes the pulp to be discharged laterally against the screen plate 2 with great force through the centrifugal tendency. This causes the finer fibrous portions of the pulp to be carried through the screen plate into the annular chamber 4 where they fall into the conduit-7 and are discharged from the machine through the outlet 8. The tailings comprising the knots, slivers and foreign material too coarse to pass through the screen plate fall through gravity and collect upon an inner projecting annular shelf or ledge 44 which comprises a portion of the screen supporting frame 11. It has been found in practice that considerable usable material adheres to the tailings and so is lost. By subjecting such tailings to a rewashing operation by forcibly discharging a jet of clear water thereon such adhering usable portions of pulp may be detached from the coarse unusable portions and by a subsequent rescreening operation such usable portions may be separated therefrom and recovered. In order to save such adhering the lower portion of the portions of the pulp there is provided in the present construction rewashing and screening means comprising an auxiliary rotary distributer 45 located beneath the main distributer before described and carried upon the same shaft. The auxiliary distributor 45 rotates in unison with the main distributer and comprises a central annular body from which projects radial wings or values 46extending beneath the inward projecting shelf or ledge 44. At its bottom the annular portion 45 merges into a horizontal shelving portion as at 47 similar to the construction of the main distributor as before described. This auxiliary distributor is best shown in Figs. 1, 6, 7 and 8. Located about the inner periphery of the auxiliary distributor and adjacent-to the top thereof is an annular gutter or channel 48 divided by radial Walls 49 into segmental sections. Extending radially from the gutter or channel 48 are a plurality of discharge nozzles 50 overhanging the annular ledge or shelf 44. Projecting upward from the bottom of the main housing is a sleeve 51 having about its periphery a Water passage or conduit 52 provided with discharge orifices 53 adapted to discharge into the annular gutter or channel 48 of the auxiliary distributer.

A water supply pipe 54 leads to the annular conduit 52. The construction is such that water supplied through the inlet pipe 52 is discharged through the orifices 53 throughout the periphery of the conduit 52 into the adjacent gutter or channel 48 of the auxiliary distributer. Tnasmuch as the auxiliary distributor is being rotated at a high rate of speed the contrifugal tendency will cause the water collected in the channel or gutter 48 to be forcibly discharged radially through the discharge nozzles 50 upon the shelf or ledge 44 where by mixing with the tailings which have collected upon such shelf or ledge it loosens the attached portions of usable fiber from the coarse or unusable tailings and washes the mass of tailings and fiber off said ledge or shelf 44, whereupon it is engaged by the wings or vanes 46 of the rapidly revolving auxiliary distributor and forcibly projected against screen plate. By this means the usable pulp which may adhere to the tailings is discharged through the screen plate into the annular chamber 4 while the distributor chamber and is finally discharged through the outlet 9.

Inasmuch as considerable power is required to rotate the distributors at their necessarily high rate of speed it is desirable, although not essential, that auxiliary actuating means he provided for the distributers.

I To this end there are provided upon the interior of the auxiliary distributor 45 and beneath the annular channel 48 a series of refuse falls to the bottom of the vanes or buckets 55 upon which are distributer 45 as a water wheel afi'ording a source of power supplemental to the drive pulley 36. This auxiliary driving feature is best shown in Figs. 1, 8 and 9. \Vhile the vanes or wings of the upper and lower distributer sections of the main rotary distributer are preferably off set or alternately arranged as shown in Fig. 5, this construction is not essential, but the wings of the two sections may be arranged one above the other as shown in Fig. 10. In Fig. 3 the course of the inflowing supply of.' pulp, whereby the pulp is supplied equally throughout the entire circle of operation to both the upper and lower sections of the main distributer, is fully shown by the darts or arrows.

i From the above description it will be apparent that there is thus provided a machine of the character described, possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in its form, proportion, detail construction and arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

While in order to comply with the statute, the invention has been herein described in language more or less specific as to certain structural features, it is to be understood that the invention is not limited to any details but that the construction described comprises but one mode of putting the invention into effect and the invention is therefore claimed broadly in any of its possible forms or modification within the scope of the appended claims.

Having thus described my invention, I claim;

1. In a pulp screening machine, a screen member, a revoluble distributer, an annular equalizing chamber into which the supply of pulp is received, the bottom of said equalizing chamber having a centrally disposed flanged opening'thereimthe flange of which is overfiowed by the pulp in its passage to the rotor, substantially as specified.

2. In a pulp screening machine, a screen member, a revoluble distributer, an equalizing chamber into which the supply of pulp is received, the said equalizing chamber having a flanged feeding orifice located coincident with the axis of the revoluble distributer, the said flange being equal in height throughout whereby the pulp will overflow said flange equally throughout its periphery thereby supplying the distributer equally throughout its circle of operation, Substantially as specified.

specific herein shown and 4. In a pulp screening machine, a screen member, a rotary distributer, a plurality of equalizing chambers each independent of the other into which the supply of pulp is received, each chamber being adapted to independently discharge its supply of pulp into the distributer at a different height, substantially as specified.

5. In a pulp screening machine, a screen member, a rotary distributer, a plurality of equalizing chambers into which the supply of pulp is received, concentric flanged openings in the bottoms of said chambers, the flanges about said openings projecting upward above the bottoms of the chambers, the said flanged openings being of difierent di ameters and each adapted to discharge pulp from its corresponding chamber into the distributer, substantially as specified.

6. In a pulp screening machine, a screen member, a rotary distributer, a plurality of equalizing chambers into which the supply of pulp is received, a pulp supply conduit leading to the said chambers and a division wall separating the chambers and registering with the discharge orifice of the conduit whereby the pulp supply will be apportioned to the difi'erent chambers, and pulp discharge orifices from each of the chamlpiefis to the distributer, substantially as speci- 7 In a pulp screening machine, a screen member, a traveling distributer, a plurality of equalizing chambers located one above the other, a common pulp supply conduit discharging simultaneously into said chambers, and discharge concentric orifices from all of said chambers through which the pulp is discharged to the distributer, substantially as specified.

8. In a pulp screening machine, a screen member, a rotary distributer comprising a plurality of series of radial vanes the several series being arranged one above the other, a pulp receiving chamber divided into compartments, one for each series of vanes and an independent conduit leading from each compartment to the corresponding series of vanes, and means for supplying pulp separately to each series, substantially as specified.

9. In a pulp screening machine, a screen member, a rotary distributer comprising a plurality of series of radial vanes the several series being arranged one above the other, and a plurality of independent conrotary distributor,

centric pul supply conduits, there being one such in ependent conduit for each series of vanes.

10. In a pulp screening machine, a screen member, a rotary distributer, a pulp supply chamber located above the distributer, and a flanged discharge orifice for said chamber located concentric with the rotary distributer, the flange of which projects equidistant above the bottom of the chamber throu hout its entire extent.

I 11. In a pulp screening machine, a screen member, a rotar distributor, an equalizing chamber into w ich the'supply of pulp is received, having a flanged outlet located in the bottom thereof, said flange terminat ing in a horizontal plane above the bottom of the chamber.

12. In a pulp screening machine, a screen member, a rotary distributer, an equalizing chamber into which the-supply of pulp is received, and an outlet conduit projecting within the chamber in axial alinement with the distributor.

13. In a pulp screening machine, a screen member, a rotary distributor, an equalizing chamber into which the supply of pulp is received, and an outlet conduit discharging into the rotor in a position coincident with the center of the rotor and walls of the intake extremity of said conduit terminating within the chamber in a horizontal plane removed from the bottom of the chamber 14:. In a pulp screen, a screen member, a rotary distributer, an annular channel carried by said distributer, radially disposed discharge nozzles leading from said channel, a water supply discharging into said' channel, the water collected in said channel being discharged in a radial direction by Eenfltrifugal tendency, substantially as speci- 15. In a pulp screen, a screen member, a an annular channel car ried by said distributer, division walls in said channel dividing into segmental sections, radial discharge nozzles leading from the channel coincident with the advance side of said walls, and -means for supplying water to said channel to be discharged through said nozzles by centrifugal tendency, substantially as specified.

16. In a pulp screening machine, a screen member, a rotary distributer, a series of buckets carried by the distributor and a menace water supply nozzle adapted to direct a jet of water upon the said buckets to accelerate the rotation of the distributer, substantially as specified.

the inner side of the main housing wall and v extending inward in a radial direction and engaging the said segmental sections to maintain said sections in their adjusted positions substantially as specified.

I8. In a pulp screening machine, a main housing, a rotary distributer, an annular screen member within the housing but spaced away from the walls thereof to form an intermediate annular chamber, said screen member being divided into a plurality of segmental sections, arms pivotally supported on the inner side of said main housing and extending radially inward, said arms being bifurcated at their inner extremities and adapted to engage the adjacent edges of succeeding sections, to maintain such sections in adjusted positions, substantially as specified.

19. In a pulp screening machine, a screen member, a rotary distributor, a pulp charge orifice concentric with the distributer, and a marginal flange surrounding the discharge orifice and projecting in a direction away from the distributer.

20. In a pulp screening machine, a screen member, a distributor rotating on a vertical axis, a,pulp supply chamber located above the distributer having in its bottom a pulp discharge orifice concentric with the dis tributer, and a marginal flange surrounding the discharge orifice and projecting above the bottom of the chamber, and terminating in a horizontal plane, the construction and arrangement being such that the pulp overflows-the flange from the chamber in passing to the distributer. v 0.

In testimony whereof, I have hereunto set my hand this 9th day of May A. D. 1912.

PEDER P. SIBYE.

Witnesses:

J. M. BENNET, J. E. L. Goon dis

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