Centrifugal pulp-screen.

Application filed September 3, 1909. Serial No. 616,124

To dll whom, it may concern: I

Be it known that I, Charles AV. Thomas, I a citizen of the United .States, and a 1'esi- ! dent of Edgewater, in the comity of Bergen j r> arid State of New Jersey, ha ve invented certain new and useful Improvements-in Centrifugal Pulp-Screens, of which the following is a specification.

The invention relates to improvements 10 in centrifugal screens for ground-wood pulp, sulfite, and other materials, and it consists in the novel features, arrangements, and combinations of parts hereinafter described, and particularly pointed out in the claims. 15 The present invention comprises improvements on machines of the class indicated in Letters Patent No. 809,642 granted January 9, 1900 to Charles AV. Thomas, and its object is to produce a machine of greatly increased 20 capacity and efficiency and of improved mechanical· construction.

The invention will, lie fully understood from the. detailed description hereinafter presented, reference being had to the aecom25 panying drawings, in which:

Figure 1 is a side elevation, partly broken away and partly in section, of a machine embodying my invention, and Fig. 2 is a horizontal section, _:on the dotted line 2—2 30 of Fig. 1, of the same.

In the drawings, 10 designates :i suitable supporting base frame for .the operativeparts of tne. machine. .

I prefer to make the body -of the machine ³⁵ of'a series of castings mounted and secured one upon another, the lower one of said castings which is. directly supported upon the base-frame 10 being designated by the numeral 11, the adjacent higher casting by .the. ⁴⁰ numeral 12, the’next higher casting by (he numeral- 13 and tlie top casting by the. numeral 14. 'These, eastings form the. stationary inclosing shell or casing of the machine and in addition are constructed to perform ⁴⁵ certain duties hereinjifter specified. Within the casing of the machine -are mounted a series of vertical cylindrical screens or baskets 15 into which the st ock to* be screened is delivered from a, central ro³⁰ tary feed hopper 16 through* nozzles. 17 leading therefrom, aiid intosaid screens and which screens or baskets in the usual operation of the machine have imparted to them a rotary motion on their own independent axes and at the same time a planetary or 55 revolving motion around the central vertical axis of the machine in a direction reversely to. that of their rotary motion. The good stock passing through the screens enters an annular chamber 18 and is conducted away, 60 while the slivers and ref use descend through the open bottoms of the screens and enter a, trough 19, whence they are conducted away by any suitable piping, not shown, connected with the discharge 20 from said trough. 65

The bottom casting 11 is of cylindrical or ring outline, being open at its central vertical portion, and in it is formed the trough 19. The casting, 11 at its outer sides extends upwardly beyond the horizontal· plane of 70 the trough 19 and is flanged at its upper edges, as at 21,, to receive the lower flanged edges of the outer sides of the casting 12. The casting 11 is formed integrally with the discharge 20 from the trough 19 and with 75· the discharge 22 from the annular chamber 18.

The casting 12 is of annular shell formation and within its outer portions and the outer vertical portions of the casting 11 is 80 formed the chamber 18. The .casting 12 is seated mi the casting H and is formed with ; an inner annular vertical partition:23 which’ defines the inner side of the lower portion of the chamber 18 and extends upwardly to 85 about the horizontal plane of the lower ends of the screens or baskets 15. At its upper -end the casting 12 extends inwardly on a horizontal plane, as at 24, and thence flares upwardly and. inwardly, as at .25, to about 90 the horizontal plane of,the upper ends of the, screens or. baskets 15. ' ..

_?The casting 13 is seated on the upper horizontal portion 24 of the casting-12 and has a top portion 26 which is open at its ver- 95 tical center and formed around the opening with a flange 27, upon which is seated a casting comprising a disk-portion 28 open at its center and a depending tubular portion 29 having gear teeth formed around its lower 100 edge to constitute a stationary gear wheel 30.

The casting 14 is seated on the outer portions of the disk 28 and comprises an integral elbow 31 which leads to the hopper 16 and to which will be connected the piping. 105 not shown, for directing the ground wood and water, or other materials to be treated, to the machine. The elbow 31 is formed

875,178 fil with a vertical bearing-sleeve 32 for the upper end of the vertical actuating shaft 33 and with a bracket 34 as a support for the bearing for the inner end of the driving 5 shaft 35.

The shaft 35 may be driven from a beltwheel 36 thereon, and is provided with a beveled gear-wheel 37'in mesh with a bev10 qq mi^ai i“j¹ oo °^{n llie u}PPer ^{end of shil}ft ¹⁰ « ^Tl^{le 33 ls} driven from the shaft o , and said shaft 33 extends downwardly through the . vertical center of the machine ?^{nd at} its lower end is stepped in a bear“ Ate*;*-!” ..

casting, lhe central portion 42 of the cast 20 ing 40 is in the form of a vertical cylinder concentric with the shaft 33. and forms the rotary hopper 16 for the material to lie: screened. i »_R , The casting yo below each basket 15 is ί formed with a bottom cup-section 43 having upper enus oy the 'iim-Je-i' at its outer portion a discharge opening 44 bands46,53.respectivefv ’ and along its upper edges an annular flange end of each basket or scr or shoulder 45 to snugly encompass, withott .< ’ ¹ °* n ¹ ί Λ’ ^ie '.'^i,rti^cal P^ortlou of the angular I i

A” ίί ΛΚίΑώ* 4,¾ ft; ·Κ“«* «•«u.jg ,i„„_u„aiv _K. the lowej- e.,ds <,J U.e vertieTl 1 1₈7 i . “·^r V™ »4 l»to« SnUdS «hid. the ™_s „_r I -“‘,» .‘I'!?'· ORtWC ·<> .«.™ th. sh.K he lower ends of the screens or baskets 15 i screens io to p are open and the material, to be treated is I desirable stock fed upwardly into the baskets through their ’ open lower ends by nozzles 17 which connect witli the hopper 16 and are carried by the·

4« ^castmg 40. Tile nozzles.17 incline iiniviii-rlltr affords vertical tubular bearings 50 for the upper portions of the shafts 48. Upon the upper ends of the shafts 48 are secured the gear-wheels ol m mesh with idlers 52 which .lie earned by the plate 49 and engage the 70 | stationary gear wheel 30. During thc^rotation of the casting 40 carrying the baskets or screens 15, (lie idlers 52 are carried against the stationary gear wheel 30 and tliereoy caused to rotate and impart rotary 75 movement to the gear wheels 51, shafts 48 and baskets or screens 15, with the result that while the. baskets or screens are revolv^{axis of the shaft 33 the}.V have .........t ¹¹ ,. ; .--------------d. ^,χ „j own axes m a direction reversely to that of time the parts ot the machine that with each planetary movement or revolution of tlie ^S(Teens or baskets 15. said, screens or baskets 85 will lime one rotation on their own axes.

he baskets or screens 15 are preferably formed of perforated sheet metal and sustained and strengthened at their lower and upper ends by the angle-iron encompassing 90 ^,,!,n‘^k4“ ^M -.......-Within the upper

---... ...,,. MUMX.VJ ur screen is secured a cover-plate· ;>4, which is .preferably in the form ot a casting of inverted eotie shape the apex of the cone ·· '· -*· -1 close the upper ends of the baskets or ^to Pⁿ’^vent the unscreened or un• or slivers from working up JOO . · -- of. the screens and pas ^: I ^)nl° the chamber IS for. screened stock.

H ^XV^{nCline u}P^war^y ^toP^s oLthe* baskets honn2r\ft f^{3 7} from the ower end of the in the present instan ' t n£?ui¹⁶ n “ ?^,utabIe distance and then closed at their- ui turn laterally amt upwardly and outwardly cone-shape of the a^opg δη®,,side of the. shafts 48 and terminate the bearings 5 0to'e JendJLvn w,S “J reasonably close relation to the inner face &lt; : . . Γ\· · ^lo . down»aidh of the screens. I also, preferably form the nozzles 17 witli discharge portions of grad!i^al^ ⁱⁿ?^ieas?^{ni? cros}S-section so as to spread the discharging material oyer a reasonably eo S^{e urea} °f the screens. The nozzles IT incline upwardly, and this is a feature of advantage since by reason thereof the material will be discharged upwardly against the screens and have a more over , the sarnie than would be the case if the njateiial were projected on a direct horizontal line against the screens; When the

.. *£. j‘^h»,r f~ had passed beyond the field of greatest cen- ^{11U 1(} tnfugal action.;

_e«. Upon the central tubular portion 42 of the casting 40 is secured a plate '49 which or imo\ ei the sides ot the screens and passing . χ_νν11νΛ, siutk. Tn ? my qtoresaid Letters j’ateiit 809.642 the .-, --------> ore partly closed, while m the present instance the baskets are wholly 105 ^A,~ 'r- upper ends. .The inverted • coyer plates 54 enables .

considerable distance along the shafts 48 and effectually maintain said sh. ft's against eeip H'¹tufugal action tending to force them outwardly. 'fhe lower ends of the shafts 48 ^ar&lt;f ^he*d · f^he bearings 47, and the', lower ends.of rhe baskets are within the· annular flanges or shoulders 45 which materially aid ¹¹⁵¹in resisting centrifugal action tending to force the baskets outwardly. The aiTaiigedly against the force the baskets outwardly. The amTiee®^XthPiffh¹ ’“’l* °^{f the 40 a}nd plate 49 enables e the. case if the me to very effectually secure the baskets and

K Λ *41 η'Λή 1.. — .J.1. _ 1 ». „ . . .. . · ** , ·.—,, uvvuic ure uasisets and to place the gear wheels 51, ’52 above the ¹²⁰baskets instead of below theiii. · weter) js fed through the elbow’31 to ¹²⁵

----x-r-A- — x7, which direct the same upwanlly against the inner surface &lt;if the screens 15, the latter at the same time being m rotation and also carried on a path around the central a_fxis of the machine. ¹³⁰ »70,170

The stock which passes: through the side of the screens or baskets and is thereby relieved of slivers and the like, enters the annular chamber 18 and thence escapes or is led 5 away through the discharge 22. The stock which fails to pass through the sides of the screens descends through the open lower ends of the screens and enters the cup-sections 43, whence it escapes through the open’9 ings 44 in said sections and descends into the annular trough 19 and finally passes through the discharge 20. The rotary and planetary movements of the baskets or screens 15 are the same as the movements described for the 15 baskets or screen’s in my aforesaid Letters Patent and'therefore require no further detailed description.

The present, invention comprises a new construction of machine employing the ro20 tary and revolving baskets or screens whereby greater durability, convenience, efficiency and capacity are attained. A further novel feature of the present machine resides in connecting to the discharge 22 a pipe 55 25 whose lower end enters a receptacle 56 which receives the screened stock and from which said stock flows away through a pipe 57, which is above the level of the lower end of the pipe 55. The screened stock forms a ³⁰ seal within tbe receptacle 5G for the lower end of the pipe 55. and the purpose of this seal is to deaden, as far as possible, the air within the main chamber of the machine, so that there may be as little interference as ³⁵ possible from air currents and eddies, to the passage of the stock through .the screens, and also so that the casting 40 and parts carried by it may during their movement be enabled to travel in a dead air-chamber or ⁴⁰ a chamber in which tbe air will simply be churned up by said parts during their movement. When the casting 40 and parts carried by it move in a dead air-chamber much less power is required to rotate them, their ⁴⁵ movement is smoother and there is less wearing on the machine and the screens with less air interference are enabled to screen the stock with greater efficiency and capacity. The sealing of the pipe 55 prevents tbe crea⁶⁰ tion of strong air currents within and through the main chamber of the machine, \the ail’ ordinarily heretofore having been driven with great force into the discharge for screened stock, as an outlet.

⁵⁵ What I claim as my invention and desire to