US1559528A - Centrifugal screen - Google Patents

Description

Oct. 27, 1925- 1,559,528

H. STUB CENTRI FUGAL SCREEN Filed June 26, 1925 Patented Oct. 27, 1925.

UNITED STATES PATENT OFFICE.

HANS STUB, OF OSLO, NORXVAY.

Application filed June 26, 1925.

To all whom it may Concern:

e it known, that l, llANs S'rb'n, subjeft of the King ot Norway, residing; at Kirle- Veien 78, Oslo, Norway, have invente l certain new and useful l mprovements in tlentrituga] tereens; and I (lo hereby (leelare the following to be a full, elear, and exact. (le Seription o'i the invention, such as wiil enable others SllllCtl in the art to which it appertains to i ial e and use the same, reieronte being had to the accompanying' tlrawings, aml to letters or ligures ot reference marked thereon, Which form a part of this speeiliea tion.

ln Centril ugal sereens l or sorting wood pulp (paper pulp) into eoarse and fine libres it is important to obtain a substantially perl eetly Uniform supply ot the pulp water t-o the Screening eylimler preterably in a tangential tliret'tion, because in such case no listurbanees ol the hel tai movement ol the pulp water over the eylimler will ltllx'C plaee or same Will be retlueetl to a minimum. In the type of sereens, wlierein the pulp is supplied inside the (fentri'l ugal wheel or to the Wings, such a unitorm tangential supply is (liflieult to peri orm. lut it might bo ob tained by eausing the pulp to tale a rot'ating motion and in this state to supply itat: the end ot the sereenin (ylinder, bel ore it is eaught by the eentritugal Wheel proper. (hu) has trietl to obtain this result by supplyin; the pulp to the eylinler by a separate wheel construct-ed mproximately like the wheel of a centriugnl pump and mountel on the same shaft' as the eentritugal Wheel.

However, in order to obtain a quite uni- .torm outllow troni the pump wheel, it is neeessary :hat the wheel ehannels be eom pletely lilletl by pulp water, which in turu Pan bo ottet'tel only It the outlow lhere't rom takes pla'e in water liqui l) not in air and that the outtlow aperturi: ot the pump, Whieh l orms also the supply to the srreening eylinder, be a eireular aperture (oneentrie with the Said eylinder.

In the present nvention the Conditions above named are fulfilled by arranging on the blade shatt, adjarent the supply to the Screening eylinder, a dise Which is provided at the supply side with pnmp blades surrounded by a Curved tight detleetion wall, the largest inner (liameter of Which is larger Seral NO. 89,307.

than the tlltll1t`ti`l` :xi satl wall tormihg t to the sereeuing ey silo to the supply.

Preferably the punp blules on the l`* ply side of the rulial (lis may onstitut" eontinuous extension ot the tntril ng i blates which ro rotatin' lit i(l() the s I'(-(` ing eylintler proper.

[in embodiment ot the in ention is illus tratel in the areompanying drawing, show ing a longittnlinal section ol the eompete apparatus.

1 (lesignates -he pulp supply, the punp Wheel blades or wings, the hub (lise ol the pump wheel, l' the pump easing, 5 the screening eylinder, the eentritunal wlieei, i" the outlet .for the line lillered pulp alul 8 the out# let lor the (oarse pulp (mill pulp, reliuer pulp).

'l'he pump Wheel thus eomprises the lmb (lise i, being ol approximately the same (iiameter as the Screening (ylintler, and the Wingb extemling a (listanee l arther out. Thepump wheel l thereby will be larger in (liameter than the Screening (ylil'nler. AS a consequence thereol when the machine is in operation, a mueh larger quantity o' liquil must rotate in the exterior part ol' the pump easing. (won il the supply is very small.

Now, the hub (lista of the pump Wheel 'is made so large that its exterior edge in all vases projects somewhat down into the ro tating liquiil. 'thereby the air is preventel from passing` baok into the pmnp Channels, eohsequentty the Said Channels Will remain quite tilled with pulp Water. The Veloeity through the ehannels Will thereby be as Nearly as possible ol the same Value :ill over at the same (listam'e l rom the Centre alul may bo regulatod by a elosinr member arrmgetl in the supply pipe.

i ron the pulp water rotating within the exterior part of the pump Casing` a Uniform Current pusses on to the sereening eylimler, and the quantity may be regulated Within \Vide limits by the Said closing member in the supply pipe.

lt will be obvious that the rotation Velocity of the pulp water, when entering the cylinder, will be approximately the same one as that of the centrifugal member.

Therel lOSSeS due to shecks Will he avoidvd and a nlObt pessihly unitornl motion &long the screen is obtained.

ln the einbodiment described above, the wall 4 surrounding the puinp blades is btationary, but ohvieusiy nothing prevenir-1 being constructed as a rotating member. in the latter case 'the \Vall l is connected in Some suitable manner with the hlales :l Or With the rotating` Shat t as Ordii'Iarily uSed in centrifngal plnnps.

Claims:

l. 'l he coinhinatien with a 'entril ugal screen ceniprising` a herizuntally arranged Screening cylinder, retating hiades within Said cylinder and an axial supply, nl a rotating (lisc Spaced i ruin said cy inder at the supply end thereet, punlp l l2(l0$ at the Supply side of said disc, a housing enclosing said diSc, the Outer end of said houing being adaptecl te receive the material to be screened and the inner end et Said housing alnltting the supply end (it Said screen.

2. The inVentiOn as claimed in claim l, Wherein the dianleter Of said disc is net es than the (li nnetcr et' Said screen.

'lhe inrentiun as cainhd in claim l, wherein the lll l dic is ennted upon the Bhatt carrying Said rotating hlades.

'l he lnwntinn is claimed in claim l, \Vherein the pnnp hlades en Said disc extend (H'Ql' the edg e thereO and nlerge int) the re Specii-,e retating hlades.

'lhe invention as claimed in claim l, \Vherein the largcet inner diameter el Said housing S greater than the (lian eter ol Said screen.

ln tcstiinony that l claim the foregoing as my inventifln, 'l have signed ny name.

HANS STUE.

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