US1688838A - Drum for centrifugal separating apparatus - Google Patents

Description

Oct. 23, 1928.

K. J. SVENS'SON ET AL DRUM FOR CENTRIFUGAL SEPARATING APPARATUS Fi led Dec. 11, 1926 4 Sheets-Sheet 1 K. J. svENss-oN ET AL DRUM FOR CENTRIFUGAL SEPAR ATING APPARATUS Oct. 23, 1928.

4 Shecs-Sheet 2 Filed Dec. 11, 1926 M In vent/211s,

h flitorny Oct. 23, 1928.

K. J. SVENSSON ET AL DRUM FOR CENTRIFUGAL- SEPARATING APPARATUS Filed Dec. 11, 1926 4 Sheets-Sheet 3 Oct. 23, 1928. 1,688,838

7 K. J. SVENSSON ET AL D RUM FOR GENTRIFUGAL SEPARATING APPARATUS Filed Dec. 11, 1926 4 SheetsSheeb 4 Patented Get. 23, 1928.

UNl'l'ED STATES 1,688,838 earner OFFICE. v

KARL J'OHAN SVENSSON, OF LIDINGO VILLAS-TAD, AND KARL AXEL PATRIK NORLING,

0F SODER'I'OR-NS VILLAS'IAD, SWEDEN.

DRUM FOR CENTEIFUGAL SEPARATING APPARATUS.

Application filed December 11, 1926, Serial No. 154llVhen centrifugally separating liquid mixtures, comprising two or more liquids ot dili'erent specific gravities, and containing solid particles of various kinds insuspension, the separated solids of a speclfc grav ty higher than that of the heaviest fluid ingredient remain in the drum. the per-- centage of these solids be relatlvely large the drum will be filled by slime or the like in a very short time and, consequently, must be stopped frequently for cleaning, especlally so in the case of the well known type of centrifugal drum fitted with plates, as the so called slime chamber, i. e. the free space between the plates and the outer walls of the drum is small relatively to the capacity and separating efliciency oi? the drum. By arranging the outlet for the separated heavier fluid ingredients in such a way that their velocity is maintained high during their passage from the outer parts of the drum (the shine chamber) to the actual discharge from the drum (nearer to the centre) a large proportion of the slime with a specific grav ty only sligl'itly exceeding that of the heavier liquid can be conveyed by, and discharged together with, that liquid, thus enabling the drum to be run a considerably longer time without stop than if all the solids were to remain therein.

This capability of the drum to discharge continuously a large proportion of the separated slime is obtained by conducting the separated heavier liquid or liquids from the slime chamber through a number of narrow tubes, or better still through narrow channels or grooves situated on the upper side of the so called top plate, i. e. that part which keeps apart the separated fluid components during the discharge from the drum. The position of the entrances within the drum (in the slime chamber) to said tubes or channels is, however, oi great importance. If the liquid mixture contains only solids of such specific gravity that they can be conveyed by the fast flowing heavier fluid ingredients, these entrances should be situated in the outer part of the slime chamber so that the smallest possible amount of solids will accumulate inside the drum. But'if this arrangement be used for separation of a mixture containing a large proportion of heavy solid particles, such as metal chips, sand, grit or the like, which solids cannot be washed out together with the heavier liquid, these particles would ,llL and in Sweden December 29, 1925.

soon iill and choke up the small space outside the entrances to the channels, after which no separation 01 the liquids would take place until the drum is cleaned; consequently the drum should be stopped long before the slime chamber is filled by solids.

For a liquid mixture of the latter kind the.

entrances to the channels should be situated at a greater distance from theoutside walls of the drum, this distance varying in relation to the proportions and characters of the different solids present in the mixture.

The present invention has for its object an improved arrangement to enable a centrifugal drum tor the above mentioned purpose to run as long as possible without being choked, when separating solid particles and impurities oi diiierent kinds from a liquid mixture.

According to this invention a. centrifugal drum for the continuous separation of fluid mixtures, as mentioned above is provided with means for varying the distance from the centre of the drum to the entrances of the channels, which entrances lead from the so-called slime chamber, so that the largest possible quantity oi solids can be separated without said entrances becoming choked,

thus enabling the separation to continue as long as possible without any stop for cleaning purposes. Four different arrangements of the invention are illustrated by the accompanying drawings in which Figures 1, 3, 5, 7, 9, 11, 13 and 15 show in sectional elevation centrifugal drums arrangedaccording to this invention and Figures 2, l, 6, 8, 10, 12,

1 1- and 16 show part horizontalsections on the lines 22, 4l4l, 6-6, 88, 1010, 12-12, 1 t14 and 1616, Figures 1,3, 5, 7, 9, 11, 13 and 15 respectively, with the top part of the drum removed. In all the Figures a is the bottom part of the drum, Z) the top part or bonnet thereof, 0 a ring nut for holding to gether the bottom and top parts a and o, d is a receiver and distributor for liquid ted into the device, 6 is an interior arrangement consisting either of a number of conical plates 0t known design or of radial wings extending outwards from the distributor d, f is the so-called top plate, which keeps apart the separated heavy and light liquids during their discharge from the drum a. The top plate 7 is formed on the upper side of its conical part with radial grooves or channels (or said grooves or channels may be :formed in the underside of the bonnet 6 leading to the outlet 'h for the heavy liqui and said top plate f is provided with a neck 7' open at thetop, and constituting the outlet is for the light liquid.

In Figures 1 and 2 is shown a top plate f with the entrances m of the channels 9 near to the outer wall of the drum a, an arrangement suitable for separation of fluid mixtures containing relatively light solids only. By replacing this top plate by one f as shown in Figures 3 and 4, the drum can be adjusted in a simple way for separating liquids containing both relatively heavy and light solids as in the last mentioned top plate the entrances m to the channels 9 are situated at a considerably greater distance from the-walls of the drum a, thus, the slime chamber can befilled to a greater extent by heavy solidswithout the channel entrances becoming choked.

Figures 5, 6, 7 and 8 show an arrangement where the channels 9 are formed in the top part b. In Figures 5 and 6 the outside edge of the top plate F. is stepped to difierent depths as at it (see Figure 6) and arranged so that if this top plate be placed in different angular positions the slots formed be tween the stepped parts a and the wall of the drum a would come in line with the chair nels 9 thus varying the position of the channel entrances. As shown in Figures 7 and 8 the top plate is provided with a series of holes situated at different distances from the drum centrebut arranged in an analogous way and with the same effect as the steps a of Figures and 6.

In Figures-9, 10, 11 and 12 the top plate 7 is formed with slots p from the outside edge in line with the channels 9 and extending radially inwards near to the outside diameter of the set of plates 6. Between the top plate and the set of plates e is inserted an interchangeable plate 9 of the same shape as the underside of the top plate f. By having a series of such plates 9 with different outside diameters the positions of the entrances to the channels 9 can be varied merely by changing the plate 9. In Figures 9 and 10 this plate 9 is of such a diameter, that the channel entrances are situated close to the wall of the drum (1. While in Fig ures 11 and 12 the plate 9 is of a smaller diameter and consequently the channel entrances are situated at a greater distance from said Walls.

In Figures 13, 14, and 16 the top plate f is arranged as in Figures 9 to 12 but, instead of a series of interchangeable plates g of different diameters, only one plate 0* is fitted but this plate can be turned into different positions. In Figures 13 and 14; the out side edge of the plate r is stepped as at s so that according to the different angular positions of said plate, the effective length of the slots 1 in the top plate f is varied, While in Figures 15 and 16 the plate 7" is formed with a series of holes t at different distances from the centre but arranged in ananalogous way to the steps a of Figures 13and 1 2, thus producing the same effect on the position of the entrances to the channels y.

We claim:

1. A centrifugal drum, for the continuous separation of mixtures of a plurality of fluids of different specific gravities containing solid particles in suspension, provided with a top plate adapted to keep apart the separated lighter and heavier fluid compo-' nents during their discharge from the drum,

and adapted to determine the position of entrances to channels adapted to discharge the heavier'flnid components at a relatively high velocity, soas to facilitate the discharge therewith of the separated solid particles not deposited on the wall of the drum, and means adapted for varying the distance of said channel entrances from the centre of the drum thereby to vary the permissible deposit of solid particles on the wall of the drum 2. A centrifugal drum as claimed inelaim 1, provided with a top plate, in which radial slots are cut from the periphery in line with the channels.

KARL J OHAN SVENSSON. KARL AXEL PATRIK NORLING.

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