US2905379A - Solid jacket centrifugal separator - Google Patents

Description

Sep't. 22, 1959. w. STICKER soun JACKET CENTRIFUGAL SEP ARATOR Filed A1ig. s, 1956 Inventar WILHELM S77CKF/i 4ttorneys Patented Sept. 22, 1959 SOLID JACKET CENTRIFUGAL SEPARATOR Wilhelm Sticker, Kettwig (Ruhr), Germany, ssigner t Seciety les Censtructions Guinard, Courbeveie, France, a corperatien et France Applicatien August 3, 1956, Serial N0. 601,941

1 Claim. (C1. 233-'14) The present inventien relates te a centrifugal separater intended te separate the solid particles in a liquid-solid mixture intreduced in said separater and te discharge these particles.

Separaters ef this type, werking in centinuous service, are already known in which the discharge ef the solid matters is carried out by means ef an Arehimedean screw, mounted en the euter wall ef a drum ending at one end in a cone over which the solid matters are discharged, said drum being retatably meunted in an euter drum which ferms also a cone towards the same end and threugh which the liquid, after separatien, is discharged at a distance from the axis et the separater greater than the distance at which the solid matters are discharged.

In the known centrifugal separators, of the type above mentioned, the matter te be treated enters inte the outer settling reern threugh apertures previded in the wall of the wenn drum and divides inte two parts, on the ene band, the liquid flewing towards the wider end ef the centrifugal separater and the overflow-sheet located at that place and en the ether band, the solid matters couveyed by the wenn tewards the di'scharge epening at the ether end ef the separater. Thereby, in the centrifugal reem preper, two axially eppesed flews are generated, en the one hand the flow ef the liquid, and en the ether band the flow et the solid matters.

This mede ef supply ef the matters to be treated is prejudicial as the solid matters already separated are anew mixed by the whirling with the liquid, especially when the supply ef matters te be treatedthat is te say the mixture ef the liquid and the solid particles-is carried out in the immediate vicinity ef the spet where the centrifugally separated solid particles are lifted by the Archimedean screw above the level of the liquid in the centrifugal separater.

In order te suppress the whirls resulting frorn the supply ef matters te be treated, a centrifugal separater ef the type above mentioned has been designed, in which the direction ef the flow et the whole ef the matters te be treated, frem its admissien taking place at the wider end et the outer drum up te the everflew ef the liquid, is the same as the direction et the feed motien preduced by the werm and in which the solid particles meving in this direction, after the overflow of the liquid, pass en the surface ef the euter drum ending in a cene in the direction ef the feed up to the discharge epening previded fer these particles. In the known centrifugal separater, particularly designed to separate liquids frem matters, pasty er prevailingly liquid, such as the pulp et potatoes er a suspensien of starch, the liquid is con veyed out ef the depositien clramber by means ef discharge tubes radially projecting in this chamber threugh the outer drum. These tubes have shewn te be detrimental as they cause a disturbance in the phase ef depositien already started, by hindering the metion ef the solid particles tewards the discharge epening and, if the solid particles are eventually in the granular shape,

by bringing about a sleping accurnulatien in freut ef each discharge tube.

According te the invention, these drawbacks are niet in a centrifugal separater of the type above mentioned in the fellowing manner:

The mixture ef liquid and solid matters is introdutzed, in a known way, threugh the wider end section of the outer drum, but cennectien apertures are previded in the Wall of the werm drum, lecated at suitable distances from the end sectiens ef said werm-drum, threugh which the liquid enters into the inside ef the werm-drum to be later discharged by known means, preferably in the direction epposite te the flow in the separatien reom.

Preferably, the liquid entering inside the werm-drum flews tewards a sceep-wheel mounted in a chamber directly cennected with the feeding device, the discharge channel ef said chamber being disposed coneentrically reund this feeding device.

Eventually, a device suitable te wash the separated solid particles, is previded in this centrifugal separater accerding te the inventien.

The device censists preferably in a pipe fer the feed with pure water extending axially in the werm-drumup te the vicinity ef the last eentact circle between the ring ef liquid and the outer drum: the washing water supplied by tl1is pipe is discharged threugh apertures previded in the Wall ef the werm-drum 011 the euter surface et which said water washes the solid matters.

By way ef exarnple, a ferm of embodiment of a Centrifugal separater accerding te the invention is described hereafter with reference to the annexed drawing in which:

Figure 1 illustrates diagrammatically the principle ef the operatien of depositien.

Figure 2 is an axial sectien ef the centrifugal separater.

Figure 3 is a section aleng the line IIIIII ef Figure 2.

The principle of the operatien ef depositien according te the spirit of the inventien is clearly shewn in Figure 1.

It shews that the stream ef liquid 1 and the stream ef solid matters 2 flow in the sarne direction in the depositien zene and that it is enly after the eperatien of depositien is completed that the streams are cempelled te flow in eppesite directions.

The section ef the centrifugal separater having a solid jacket illustrated in Figure 2 shews hew this principle is carried into effect. The matters te be treated, that is te say the mixture of a liquid and solid matters, is sent, threugh the feeding pipe 3 in a feeding device 4 arranged cencentrically reund the axis ef the separater and flews there frem in the euter cylinder 5, in passing threugh the accelerater 6. The drum 5 is cylindrically shaped en the side ef the feed and cenically shaped er1 the side ef discharge of the solid particles but it ceuld also be cenical over its entire length. After the decanta tien in the depositien zone 7, the solid matters are raised up by the Arehimedean screw 8 previded upen the inner drum 18 above the level ef the liquid 9 and cenveyed upen the inner conical surface 10 of the euter drum tewards the eutlet heles 11, te fall freely in the chamber 12 et. the casing 13 of the separater. The Wall ef the werm-drum 18 is previded with passage apertures 14 near the circle aleng which the cylindrical pertien ef said werm drum 18 is cennected with its cenical end portien. T he decanted liquid is forced inside the wermdrum 18 threugh the passage apertures -14 en acceunt of the cenical shape and flews atterwards in the reverse direction tewards the eutlet apertures 19' which are peripherally arranged in the bettem of said werm-drum 18 having the larger diameter; after passing said eutlet apertures 19, the decanted liquid is discharged in the chamber 20 ef the sceep wheel threugh the channels 19 of the accelerator 6. The statienary sceep wheel 21, cennected with the feeding device 4 ferces centripetally,

in a kndwn yvay, the liquid under pressure towards the outside through the piping 22. keeps the liquid at a constnt level. It is possible to modify.fthi s leyel by. thrgttliug the diselgrarge.

The drive of the centrifiigal Separater. tak'ea f l ce at the dis charge side Qf the aolid matteis. The planetgear 23, necessary to prgiduce die relative siaeeds between the outer druih and the worz 1i drurn-eonstitute a watertight block between the two maiii bearings 24, 25 and is directly connected witl 1 the bo ttom 26 cf the drum. The outer drum is driVen directly oy a motor through the pulley 27 and the connected gear box while the relative speed is imparted to the wenn drurn through the auxiliary pulley 28 and the drive shaft 29 of the planet gear 23. The relative speed can be modified within a large rang'e by imparting variable speeds to the auxilia-ry pulley 2 8.

Asillustrated in Figtire 2, the centnfugail separater is provided with a washing device used tq wash the solid matters separated frorn the liquid. Thia washing device is constituted by a pipe 30 axially enten'ng in the -centrifug al separater; 011 the one band, rotatably mo u nted in the device supplying the washiflg water, 31, and oh the ther band, passing through a central aparture 34 provided in a transverse wall 32 rigidly counected with the drum, at a small distance frorn the last contact qircle between the ring of liquid and the outer The scoop-wheel 21 drum. The washing water is conveyed bY the pipe 33 tw o hellow bodies of revolution, having the sarne shape, ta1ieiingtovzids bhe ei1d, eoaxially arranged, one inside the other to form thefbetween an annular channel, an Archimedean screw fixed upon the outer surface of the inner body, the height of the threads of said screw being adapted to the radial Width of said annular channel, means to impaft to' the two hollow bodies different :;p eec ls. o f r otat ion round their common axis, a feeding device to supply the miJ itilr e, concehtricallY arrangea '1'i1dth axis of rotati0n 'o'f the h0ll0w bodies, an accelertor arranged to k:orivty the ifii5 tt1re frcili1 said feeding device in the end sectioii haVing a larger diameter ofthe annular channel, means to discharge, near the end Section of smaller diameter of said annular channel, the solid iihs'e cntriftiglly expelled against the inner wall of the outer body and conveyed by the Archimedeau screw above the free surface of the liquid, apertures in the wall of the inner hollow body near its contact circle with the free surface of the ring of liquid tq let the purified liquid penetrate inside said hollow body where it flows in the direction opposite to the flow 0f the mixture in the annular channel, a fixed seoop wheel provided with a central discharge charmel arranged eoncei1trically wund the feeding device and peripheral charmels passing through the accelerator and disposed to guide the purified liquid flowing from the i1 1- 11er face of the inner body towards the periphery of said sc;oop wheel.

lieferences Cited in the file of this patent UNITED STATES PATENTS 1429320 Bbuilloir Sept. 19, 1922 2,5784 56 Smith Dec. 11, 1951 2,578,485 Nyrop Dec. 11, 1951 2614748 Ritsbh Oct. 21, 1952 FORElGN PATENTS 1067028 France Jan. 27, 1954

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