US1968788A - Centrifugal separator - Google Patents

Description

u y 351, 1934- F. M. TOMLINSON CENTRIFUGAL SEPARATOR Filed March 26, 1930 r 2 Sheets-Sheet 1 IJYVENTOR. F M Tomlmsan, Y

A TTORNEYS July 31, 1934. F M. TQMLINSQN 1,968,788.

CENTRIFUGAL SEPARATOR Filed March 26, 1930 2 Sheets-Sheet 2 INVENTOR.

Fag M. Tom/imam,

A TTORNEYS 30 which engages a shoulder 21 on cup 18.

Patented July 31, 1934 'ENT OFFICE 1,968,788 CENTRIFUGAL SEPARATOR Fay M. Tomlinson, Lebanon, Ind., assignor to Arthur M. Hood, Indianapolis, Ind., trustee Application March 26,

29 Claims.

The. object of my. invention. is to produce an efficientv centrifugal separator capable of automatically separating two mixed liquids of different specific gravitiesr The accompanying drawings illustrate my in- Vention: v

Fig. 1 is an axial section of an embodiment of my invention;

Fig-2 is an enlarged fragmentaryosectional detailE through the separation discs to illustrate diagrammatically the manner of fluid separation; p

Fig. 3 isfla fragmentary radial. detail through the, separation discs and adjacent parts on a plane angularly displaced from the plane of Fig. 1.

.Inthe drawings indicates a suitable base or pedestal to the upper end of which is secured a basin. 11 provided with a journal bearing 12 in which is journaled .a vertical shaft 13 driven at high speed by any suitable driving means (not shown). The upper end of shaft 13 is slightly conified, as indicated at 14, to receive the hub 1503: a circular flange 16 which forms the bottom of the main separating bowl B of the apparatus.

, 5 Flange 16 at its upper outer corner forms a circumferential shoulder 17 for the reception of the lower end of an inverted cup 18 which, with flange 16, forms the bowl B. Below shoulder 1'7 flange 16 is provided with a circumferentially threaded portion 19 adapted to receive a clamping nut 20 V A packing ring 22 is clamped in a pocket 23 in flange 16 by the lower end of cup 18 so as to insure a fluidtight joint between the parts 16 and 18. Hub 15 is tubular and opposite the upper end of shaft 13 is pierced by a plurality of openings 25 which communicate with slots 26 formed in the subtending external surface of the hub and extending to flange 16. Arranged within the bore of hub 15 above the upper end of shaft 14 is a sleeve i 30 having slots 31 at its lower end to register with the upper ends of perforations 25, and flanking each of these slots is the lower end of a rib 32 projecting into the bore of sleeve 30 and curved forwardly, in the direction of rotation, atits upper end, as indicated at 32.

Seated on a circumferential seat 35 formed on hub 15 is the hub 36 of a disc basin comprising a bottom flange 37 and an upwardly and outwardly flaring flange 38 which, at the junction with flange- 37 is provided with a plurality of perforations 39. The exterior of the portion 36 of hub 36 which lies within the height of flange 38 is provided with a plurality of verticallywxtending slots or channels 40, the purposeof which will appear.

1930, Serial No. 438,960

(Cl. 233r-18) Sleeved over hub portion 36' and resting upon the upper edge of flange 331s an imperforate disc 41, the main portion of which is upwardly and outwardly inclined and at its upper edge is outwardly extended, conveniently horizontally, as indicated at 42, towards the inner wall of cup 18 to a point beyond the normal separation line, in-' dicated by the dotted line S in Fig. 1. Also sleeved over hub portion 36' is a plurality of superimposed separation discs 44, the main portion of each of which is upwardly and outwardly inclined parallel with the main portion of disc 41 and each of which, at itsouter edge, is extended, as at 44. parallel with and to the extent of portion 42 of disc 41. The several discs 44 arespaced from each other and from disc 41 by small spacing, lugs 45. Each disc 44, substantially at the junc tion between its main portion and its flaring pora tion 44', is perforated at 46land each of these perforations is guarded, at its lower side, on the upper face of the disc, by a guard flange 4'7 which conveniently has ,a height about one-half of the spacing between two adjacent discs 44, the several discs 44 being preferably so placed relative to each other that a series of perforations 46 through the several discs will be vertically aligned. The upper edge of flange 3,8 is slotted at various points 38. to afford inlets into the disc basin immediately beneath disc 41.

To retainthe discs 41 and 44 in place there is a flange 50 carried by or associated with a hub 51 splined at 52 to the upper .end of hub 36 and held in place by a nut '53 threaded at 54 on hub 15 and retaining packing gasket 55 across the upper end of the hub36 so as to seal the joints between hubs 15, 36 and 51.

A packing ring 56, between flange 50 and the upperdisc 44 provides a seal at this point. Ex.- tending outwardly from flange 38 to a point beyond the separation line S and downwardly from, flange 37 toward the upper face of flange 16 are. a number of radial wings preferably corresponding in number to the number of channels 26.

A similar series of radial wings 62 are arranged in the corner between hub 51 and flange 50 and extend outwardly to the upper-most disc 44 preferably extendingoutwardly to near the outer parts of the perforations 46. t

Cup 18 at its upper end comprises an inwardly and upwardly extending wall 18' which merges into an upwardly extending sleeve 185, the in ternal diameter of which is considerably greater than the external diameter of the adjacent por tion of hub 15 and sleeved within sleeve 18", im-

- me r en b'bu s aced elow wall 18' is the separation cone which, at its largest diameter fits cup 18, at several circumferentially spaced points 71 and is retained therein by suitable retaining means such as spring lock pins '72. The measure of the largest diameter of cone '70 is smaller than the internal diameter of cup 18 by an amount which is somewhat less than the distance between the inner diameter of cup 18 and the separation line S.

Cone '70 at its upper end merges into a sleeve '70 which, at its upper end fits the bore of sleeve 18" at 70". Sleeve 18", below 70", and in communication with the space between wall 18' and cone '70, is perforated at a number of circumferentially spaced points as indicated at 75.

Arranged in the upper end of sleeve 70 by a sliding fit is a separation ring which is L- shaped in cross section, the inwardly extending flange 81 thereof having a desired radial dimension according to the specific gravity of the lighter liquid which is to be separated from the mixture. This ring 80 is held against upward displacement by downwardly projecting fingers 82 carried by a spider 83 perforated to receive the upper end of hub 15, sized to fit the bore of the upper end of hub 18 with intermediate radial slots 83 and splined to said hub at 84:. Spider 83 forms the upper end closure for cup 18 and nut 85, which is threaded upon the upper end of hub 15, acting against this plate, serves to hold the bowl B firmly upon the upper end of shaft 13.

Removably sleeved upon the upper end of basin 11 is an annular collecting pan P, the inner wall 90 of which flares upwardly and inwardly to a point close to the outer surface of hub 18 and considerably above the perforations '75. The outer wall 91 of pan P flares upwardly and inwardly to a point closely adjacent the upper end of nut and above the upper end of sleeve 18" of cup 18.

Resting upon wall 91 is an inverted over-flow pan 92 which at its center supports a supply pipe 93, the lower end of which is projected into the upper end of the bore of hub 15. A drain pipe 95 leads from the space under pan 92 through walls 91 and 90.

The operation is as follows. Shaft 13 being rotated at high speed, the bowl B and the parts mounted therein, will rotate at the same speed. A liquid mixture delivered downwardly through pipe 93 flows into the bore of hub 15, flows thence through slots 31 and perforations 25 (wings 32 serving to cause the downwardly fiowing liquid to acquire the circumferential speed of the struc ture) then downwardly through channels 26 into bowl B, wings 60 serving to assist the incoming liquid to acquire the circumferential speed of the bowl. At this point the centrifugal forces serve to produce the major separation between the heavier and lighter liquids, this separation occurring at about the locus S.

The lighter liquid, with any entrained, heavier liquid or articles flows thence through perforations 39 and slots 38 into the interior of the disc basin and thence upwardly through channels 40 wardly over the upper surface of the disc to its outer edge, where it enters the stream of heavier liquid which has been separated in the main bowl, while the lighter component passes upwardly through the perforations 46, being protected from. the heavier component lying upon the super-posed discs by flanges 47, and ultimately enters the space within the separating cone 7O beneath flange 81 where it accumulates until it overflows the inner edge of said flange, passing thence upwardly out over the upper edge of hub 18" in a film which is thrown out into the annular collecting pan P flowing thence outwardly through a suitable drainage opening P.

The heavier liquid passes up through the passages '71, thence over cone 70 and out through perforations 75, striking wall of the collecting pan P and dropping into basin 11 from whence it may be drained through the flange opening 11.

I claim as my invention:

1. In a centrifugal separator, a bowl, means centrally located within said bowl to permit the introduction of liquid thereto adjacent the base of said bowl, means providing a chamber concentrically arranged within said bowl and formed adjacent its base with apertures providing communication between the interiors of said bowl and said chamber, and a plurality of axiallyspaced annular plates concentrically arranged within said bowl and flaring outwardly and upwardly, said plates having their inner peripheries disposed within said chamber and their outer peripheries disposed without said chamber but within said bowl, and the upper plates perforated near their outer edges.

2. In a centrifugal separator, an outer bowl and an inner bowl having communication with said outer bowl, and a plurality of outwardly and upwardly flared axially-spaced annular plates concentrically mounted and the upper plates perforated near the outer edges, the inner periphery of each of said plates being disposed within said inner bowl, and the outer periphery of each of said plates being disposed without said inner bowl but within said outer bowl.

3. In a centrifugal separator, an outer bowl and an inner bowl having communication with said outer bowl, an outwardly and upwardly flared imperforate annular plate having its inner periphery disposed in said inner bowl and its outer pe riphery disposed without said inner bowl, but within said outer bowl, and a plurality of similar plates concentrically located above said first plate, all of said plates being slightly spaced from each other, and each of said last-named plates being formed with an aperture adjacent its outer edge.

4. In a centrifugal separator, an outer bowl and an inner bowl having communication with said outer bowl, an outwardly and upwardly flared imperforate annular plate having its inner periphery disposed in said inner bowl and its outer periphery disposed without said inner bowl, but within said outer bowl, and a plurality of similar plates concentrically located above said first plate, all of said plates being slightly spaced from each other, and each of said last-named plates being formed with an aperture adjacent its outer edge, a portion of said aperture being guarded by a dam.

5. In a centrifugal separator, an outer bowl and an inner bowl having communication with said outer bowl, an outwardly and upwardly flared imperforate annular plate having its inner periphery disposed in said inner bowl and its outer periphery disposed without said inner bowl, 'but within saidouteribowl, and a plurality of similar plates concentrically located above said first plate, all of said plates being slightly spaced from each other, and each of said last-named plates being formed with 'an aperture adjacent its outer edge, a portion of saidaperture being guardedby a dam having aheight-less than the distance between said plates.

6. As a new article of manufacture, an annular plate flared upwardly and outwardly from its center, and formed with an apertureadjacent its outer edge, and a dam formed on the upper surface of said plate and guarding the lower and lateral portions of said aperture.

- '7. In a device for effectinga two-stepseparation of liquids, a bowl, means permitting introduction of liquid axially of said bowl, means for rotating said bowl about its axis to effect an initial separation and to buildup a wall of relatively heavy liquid at the periphery of said bowl, a second bowl co-axially mounted within said firstbowl and formed with ports providing communication between the interiors of said bowls,

and means providing a plurality of outwardly "and upwardly-directed annular passages from the interior of said second bowl to the exterior thereof, the outer ends of said passages being sealed by said wall of heavy liquid, each of said passages communicating nearits outer periphcry with the next upper passage.

'8. In a centrifugal separator, a bowl, means permitting axial introduction of liquid to said bowl, said means being formed to provide large passages communicating with said bowl, an inner bowl-coaxially mounted within said first bowl and formed to provided for communication through large passages between the interiors of said bowls, a plurality of passages of small section permitting egress of liquid from said second bowl, and means for rotating said bowls.

9. In a centrifugal separator, a bowl, means permitting axial introduction 'of liquid to said bowl, said means being formed to provide large passages communicating with said bowl, an inner bowl coaxially mounted within said first bowl and formed to provide for communication through large passages between the interiors of said bowls, a plurality of passages of small section upwardly inclined in the direction of liquid flow and permitting egress of liquid from said second bowl, and means for rotating said bowls.

10. In a centrifugal separator, means formed to provide a plurality of shallow annular passages, and means for rotating said first-mentioned means, said first-mentioned means being outwardly flared and provided with a series of guarded ports adjacent the outer edges of said passages to cause the heavier portions of liquid flowing through said passages under the influence of centrifugal force to hug the lower walls of said passages, and associated flow-controlling means compelling the lighter portions to pass forwardly across the adjacent passage through said ports.

11. In a centrifugal separator, means formed to provide a plurality of shallow annular passages flaring upwardly and outwardly from their centers and communicating between their inner and outer ends, and means for rotating said first-mentioned means whereby the heavier portions of liquid flowing through said passages under the influence of centrifugal force are caused to hug the lower walls of said passages to' the outer annular peripheries of said passages and associated flow-controlling means C0111.

pelling the lighter portions to pass axially'fbrwardly to the adjacent passage near the outer edge thereof.

12. In a centrifugal separator, a bowl, means for rotating said bowl about its axis, means 'in said bowl for assisting the centrifugal separation of liquids in said bowl, a separating cone mount ed adjacent the upper end of said bowl and having an openreduced neck at its outer end, and

a ring dam mounted in said neck,said ring dam a being readily removable from the open end of the neck for substitution. 13. A centrifugal separator'comprising a tubular hub formed at its lower end with an annular flange, an inverted bowl having its lower open end detachably secured to said flange, a second bowl rotatable with said hub within said first bowl and adjacent the base thereof, said hub being formed with an axially elongated radial passage providing communication between the interior or said hub and the interior of said first bowl at a point below the base of said second bowl, and a separating cone co-axially mounted in said first bowl above said second bowl and formed to permit liquid flow from the 'body of said first bowl to the space between said cone and the upper wall of said first bowl.

14. A centrifugal separator comprising a tubu-- lar hub formed at its lower end with an annular flange, an inverted bowl having its lower open end detachably secured to said flange,'and formedat its upper end with a reduced neck, a second bowl rotatable with said hub within said first bowl and adjacent the base thereof, said hub being formed with an axially elongated radial passage providing communication between the interior of said hub and the interior of said first bowl at a pointbelow the base of said second bowl, and a separating cone coaxiallymounted in said first bowl above said second bowl, said cone being formed with an upper reduced neck received in said bowl neck, a portion-of said cone neck being snugly received in said bowl neck and a, portion thereof being spaced from said bowl 15. A centrifugal separator comprising a tubu lar hub provided in its interior with a longitudinally-extending blade, and formed at its lower end with an annular flange, an inverted bowl having its lower open end detachably-secured-to said flange, and formed at its upper end with a reduced neck, a second bowl rotatable with said hub within said first bowl and adjacent the base thereof, said hub being formed with an axially elongated radial passage providing communi-,

cation between the interior of said hub and the interior of said first bowl ata point below the base of saidsecond bowl, and a separating cone. coaxially mounted in said first bowl above said tion of said cone neck being snuglyreceived in second bowl, said cone being formed with an upper reduced neck received in said bowl neck, a porsaid bowl neck and a portion thereof being spaced from said bowl neck to form a chamber communicating with the space between said cone and,

the upper wall of said chamber; said lasbmentioned space being in communication with the body of said first bowl, and saidbowl neck being formed with an outlet, portcommunicating with said chamber.

let

-- lid 16. In a centrifugal separator, an inlet, a heavyliquid outlet, a light-liquid outlet, means interposed between said inlet and said outlets and forming a plurality of shallow annular passages leading from said inlet toward said heavy-liquid outlet, and means for rotating said first-mentioned means to effect unidirectional flow of heavy liquid and light liquid through said passages, said first-mentioned means being formed to deflect light liquid from said passages.

17. In a centrifugal separator, an inlet, a heavyliquid outlet, a light-liquid outlet, means interposed between said inlet and said outlets and forming a plurality of shallow annular passages leading from said inlet toward said heavy-liquid outlet, and means for rotating said first-mentioned means to effect unidirectional flow of heavy liquid and light liquid through said passages, said first-mentioned means being formed adjacent the outer boundaries of said passages to deflect light liquid from said passages.

18. In a centrifugal separator, an outer bowl, a heavy-liquid outlet communicating with said bowl, an inner bowl concentrically mounted within said outer bowl, means for introducing mixed liquids of different densities to said inner bowl, a chamber, a light-liquid outlet communicating with said chamber, means forming a plurality of shallow annular passages from said inner bowl to said outer bowl, and means for rotating all of said elements to effect undirectional flow of light liquid and heavy liquid through said passages, said passage-forming means being formed to deflect light liquid to said chamber while permitting heavy liquid to flow to said outer bowl.

19. In a centrifugal separator, an outer bowl, a heavy-liquid outlet communicating with said bowl, an inner bowl concentrically mounted within said outer bowl, a chamber, a light-liquid outlet communicating with said chamber, means for introducing mixed liquids of different densities to said inner bowl, an outwardly and upwardly flared imperforate annular plate having its inner periphery disposed in said inner bowl and its outer periphery disposed without said inner bowl, but within said outer bowl, a plurality of similar plates concentrically positioned above said first plate, all of said plates being slightly spaced from each other and each of said last-mentioned plates being formed with an aperture adjacent its outer edge, the uppermost one of said plates forming the bottom wall of said chamber, and means for rotating all of said elements to effect unidirectional flow of light liquid and heavy liquid between said plates from said inner bowl, said plates being formed to prevent flow of heavy liquid through said apertures, but to permit flow of light liquid therethrough to said chamber.

20. A centrifugal separator comprising a rotary bowl having two discharge outlets at the same end thereof, two nested dished annular disks mounted in said bowl for rotation therewith, said disks being flared outwardly toward both said outlets and the disk nearest said two outlets being perforated intermediate its inner and outer peripheries, an annular separator arranged in said bowl between the perforated disk and the said outlets said separator defining two passages within the bowl one leading from the space beyond the larger radius of the disks to one of said outlets and one leading from within the larger diain eters of the disks but beyond the perforation of the perforated disk to the other of said outlets, and fluid-guide means leading into the bowl to L the annular mouth between the disks at the inner peripheries thereof and isolated from said lastmentioned outlet except outwardly through between the disks.

21. A centrifugal separator comprising a rotary bowl having two discharge outlets at the same end thereof, two nested dished annular disks mounted in said bowl for rotation therewith, said disks being flared outwardly toward both said outlets and the disk nearest said two outlets being perforated intermediate its inner and outer peripheries, an annular separator arranged in said bowl between the perforated disk and the said outlets said separator defining two passages within the bowl one leading from the space beyond the larger radius of the disks to one of said outlets and one leading from within the larger diameters of the disks but beyond the perforation of the perforated disk to the other of said outlets, and fluid-guide means leading into the bowl to the annular mouth between the disks at the inner peripheries thereof and isolated from said last-mentioned outlet except outwardly through between the disks, said fluid-guide means directing fluid flow into a region of relatively high centrifugal force intermediate bowl inlet and said annular mouth.

22. A centrifugal separator comprising a rotary bowl having two discharge outlets at the same end thereof, two nested dished annular disks mounted in said bowl for rotation therewith, said disks being flared outwardly toward both said outlets and the disk nearest said two outlets having an effective diameter as to a part of the flow therebetween less than that of the other disk, an annular separator arranged in said bowl between said disks and said outlets, said separator defining two passages within the bowl, one leading from the space beyond the larger radius of the disk having the larger effective diameter to one of said outlets and one leading from within said larger diameter but beyond the smaller effective diameter to the other outlet, and fluid-guide means leading into the bowl to the annular mouth between the disks at the inner peripheries thereof and isolated from said last-mentioned outlet except outwardly through between the disks.

23. A centrifugal separator comprising a rotary bowl having two discharge outlets at the same end thereof, two nested dished annular disks mounted in said bowl for rotation therewith, said disks being flared outwardly toward both said outlets and the disk nearest said two outlets having an effective diameter as to a part of the flow therebetween less than that of the other disk, an annular separator arranged in said bowl between said disks and said outlets, said separator defining two passages within the bowl, one leading from the space beyond the larger radius of the disk having the larger effective diameter to one of said outlets, and one leading from within said larger diameter but beyond the smaller effective diameter to the other outlet, and fluidguide means leading into the bowl to the annular mouth between the disks at the inner peripheries thereof and isolated from said last-mentioned outlet except outwardly through between the disks, said fluid-guide means directing fluid flow into a region of relatively high centrifugal force intermediate bowl inlet and said annular mouth.

24. A centrifugal separator comprising a rotary bowl having two discharge outlets, two axiallyspaced nested dished annular disks mounted in said bowl for rotation therewith, one of said disks having an effective diameter as to some fluid flow less than the effective diameter of the other, an annular separator arranged within the bowl to divert discharge flow from regions of the bowl centrifugally beyond the disk of larger effective diameter to one discharge outlet, and from regions centrifugally within the maximum centrifugal effectiveness of the said last-men tioned disk to the other discharge outlet, and fluid-guide means leading into the bowl to the annular mouth between the disks at the inner peripheries thereof and isolated from said lastmentioned outlet except outwardly through between the disks.

25. A centrifugal separator comprising a rotary bowl having two discharge outlets, two axiallyspaced nested dished annular disks mounted in said bowl for rotation therewith, one of said disks having an effective diameter as to some fluid flow less than the effective diameter of the other, an annular separator arranged within the bowl to divert discharge flow from regions of the bowl centrifugally beyond the disk of larger effective diameter to one discharge outlet, and from regions centrifugally within the maximum centrifugal effectiveness of the said last-mentioned disk to the other discharge outlet, and fluid-guide means leading into the bowl to the annular mouth between the disks at the inner peripheries thereof and isolated from said last-mentioned outlet except outwardly through between the disks, said fluid-guide means directing fluid flow into a region of relatively high centrifugal force intermediate bowl inlet and said annular mouth.

26. A centrifugal separator comprising a rotary bowl having two discharge outlets, two axiallyspaced nested dished annular disks mounted in said bowl for rotation therewith, the disk adjacent the concave face of the other disk being perforated between its inner and outer peripheries, a guard around the inner portion of each perforation on the concave face of the disk and having an axial extent less than the axial spacing of the disks, an annular separator arranged in the bowl between the bowl wall and the said perforations and arranged to separate flow from outer regions of the bowl to the other outlet, and fluid-guide means leading into the bowl to the annular mouth between the disks at the inner peripheries thereof and isolated from the lastmentioned outlet except outwardly through between the disks.

27. A centrifugal separator comprising a rotary bowl having two discharge outlets, two axial- 1y spaced nested dished annular disks mounted 1 in said bowl for rotation therewith, the disk adjacent the concave face of the other disk being perforated between its inner and outer peripheries, a guard around the inner portion of each perforation on the concave face of the disk and having an axial extent less than the axial spacing of the disks, an annular separator arranged in the bowl between the bowl wall and the said perforations and arranged to separate flow from outer regions of the bowl to one outlet and from inner regions of the bowl to the other outlet, and fluid-guide means leading into the bowl to the annular mouth between the disk at 5 the inner peripheries thereof and isolated from the last-mentioned outlet except outwardly through between the disks, said fluid-guide means directing fluid flow into a region of relatively high centrifugal force intermediate bowl inlet and said annular mouth.

28. A centrifugal separator comprising a rotary bowl having a receiving inlet leading to the bottom thereof at its axis and thence radially outwardly to an intermediate pressure region within the bowl and having a discharge at its top, an annular separator disk arranged in the bowl above the discharge end of said inlet passage, the outer periphery of said disk lying in an intermediate pressure region and its inner periphery in a pressure region of lower value than the pressure region of the discharge end of the inlet passage, the eye of said disk affording a fluid passage to regions of the bowl above said disk, and a plurality of annular axially-spaced stratification disks nested in the bowl above said firstmentioned disk and below the bowl-discharge outlet, each of said disks having an outer periphery in substantially the same pressure region as the outer periphery of the first-mentioned disk and having an eye affording a fluid-fiow passage to the bowl-region below the superposed disks and also perforated intermediate its radial extent to afford fluid passage therethrough upwardly toward the bowl outlet, and an annular fluid-guiding means above the upper disk directing fluid flow from the eye of the upper disk to the bowl outlet through a pressure region comparable with the pressure region of the intermediate perforations of the subjacent disks. 110

29. A centrifugal separator comprising a rotary bowl having a receiving inlet leading to the bottom thereof at its axis and thence radially outwardly to an intermediate pressure region within the bowl and having a discharge outlet at its top, an annular separator disk arranged in the bowl above the discharge end of said inlet passage, the outer periphery of said disk lying in an intermediate pressure region and its inner periphery in a pressure region of lower value than the pressure region of the discharge end of the inlet passage, the eye of said disk affording a fiuid passage to regions of the bowl above said disk and said disk being imperforate except at its eye, and a plurality of annular axially-spaced Stratification disks nested in the bowl above said firstmentioned disk and below the bowl-discharge outlet, each of said disks having an outer periphery in substantially the same pressure region as the outer periphery of the first-mentioned disk 190 and having an eye affording a fluid-flow passage to the bowl-region below the superposed disks and also perforated intermediate its radial extent to afford fluid passage therethrough upwardly toward the bowl outlet, and an annular fluidguiding means above the upper disk directing fluid flow from the eye of the upper disk to the bowl outlet through a pressure region comparable with the pressure region of the intermediate perforations of the subjacent disks.

FAY M. TOMLINSON.

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