US1542401A - Overflow manifold for centrifugal separators - Google Patents

Description

G. TER MEER Filed March 11, 1925 l INVENTOR l W m M, i BY I l2in-rma OVERFLOW MANIFOLD FOR CENTRIFUGALSEPARATORS June 16, 1925. l

FIG.

NEYS

Patented-June 16, 192.5..

Gus-TAV TER MEER, oF HANOVERLJINDENQGERMANY.

OVERFLOW MANIFOLD FR CENTRIFUGAL SEPARATORS.

Application'led March 11, 1925.-.Seria1 No.'7r14 ,678.

To a-U whom t may conce/Nt.'

, Be it known thatl, GUs'rAv TER MEER,

a citizenl ofGermany, and resident of Han' over-Lindein Germany, have invented cer# tain new. and useful Improvements in Over;

flow-Manifolds for Centrifugal Separatore,

of which thefollowing is .al-specification.

This invention is an improvement in that type of centrifugal separator in which there is an imperforate peripheral wall or drum' and an outlet for the efliuent liquid spacedv inwardly therefrom. 'Such' separators `may be designed f or continuous or batch operation, and may discharge the solid or separated material in any-suitable manner. A construction -of -this general type is `shown in my prior Patent 1,160,635, issued November 16th, 1915. In the construction there shown the efiluentiiquids are discharged through a central opening in the cover and over an annular overflow edge.

l lVithin the chamber of such a separator the solids separated. from the liquid collect against theinner surface'of the drum with their inner surface substantially in the form of :a parabola, while the inner-surface of the liquid which .is nearer to the center of the drum is substantiallycylindrical. 'The clearest liquid is that nearest tol such in-l ner surface, but this often contains con'- sidera'ble quantities of solid matter which 'is of lighter specific gravitythan the liquid,` or whichtends Ato oat therein.. Therefore it has been considered desirable to place the y overflow as neaias possible toward thecen- ,ter of the chamber, but eventhis does not give a pure liquid. l

The separation of the solidlparticles from ..the liquid by-centrifugal force is disturbed in the inner partvof. the chamber by the current of incoming liquid so that some small particles of slightly greaterV specific gravity than the liquid are kept in 'the liquid bythis disturbingaction-and ass out along the overflow. It is obvious t at the nearer the overflow edge 1s to the center or axis, the Shorter; 1S the circumferential length .of such edge, and the deeper will bef the layer of liquid passingover. the over.

flow edge. Furthermore the less effective will be the action of centrifugal force. Thus a larger amount of solid particles will l vpass out w'ith'the eilluent liquid.

The object of *the present invention is to increase the relative diameter of the overy flow edge'and to increase the length of such edge, whereby the rate of current flow over the edge is decreased and smaller solid particles are less subj'ectto such current and more influenced by centrifugalforce. Thusmore complete separating action is secured and the"overflowing liquid is clearer than has -heretofore been possible lin `this type of apparatus. Y

If merelythe diameter of the "overflow be enlarged this correspondingly decreases the volume or holding capacity of the chamber and is not in itself satisfactory. Therefore as an important feature of my inventionI provide a plurality .of overflow edges artlie separation chamber, and disposed along approximately the inner substantially cylinr p drical surface of the body of liquid therein.

Such overows may for example consist of simple tubesl which lead outwardly from the surface and operate to drain, o' liquid overflowing into the -open inner ends of such pipesj, The liquid would be delivered through such-pipes bythe action fof centrifugal force. .The liquid may overflow not only from the upper portion of the inner cylindrical liquid surface but also from the center portion of such surface. The openings niay face to-ward the outer peripheralwall ort-owaid the center, but the pipes leadf ing therefrom should be'so disposed that the 'action of centrifugal force conducts liquid @from said openings to the exterior of the apparatus.

Instead yofvsingle. pipes, annular horizontalA rings may be incorporated in the separator and in. axiallyy spaced relationship with annular slitsupon the inner or'outer surfaces, the edges of which slits serve as. overflow lranged in superposed relationship within Iupper` ,portion of the inner cylindrical liquid edges. 'Such annular rings would constitute` -enlargedfinlet openings for pipesleading to lthe exterior -of the separator. -The annular rings are so spaced that liquid may -pass through between them, this being particularly essential if the slitsl or annular' openingsin-saidl rings face inwardly rather than outwardly. p

Various diiferent constructions vmay be designed within the scope of my invention,

and'it is therefore obvious that the specific form illustratedin the accompanying drawings is to be considered in an illustrative L ilo ratherthan in a limiting sense.

In these drawings:

Fig-1 is acentr'al longitudinal section' showing the posi-tions which the solid and liquidassume in operation, and

Fig. 2 is a transverse section on the line 2 2 of Fig. 1.

In the construction illustrated the bottom or floor 1 and the cover or top 2 are coni nected together, and the cover is of annular ity of annular vertically spaced rings 5 which are superposed within the separator and with inwardly facing annular openings 'or slits. 'Ihe rings are shown as of channel shape in cross section, whereby two annular overflow edges are presented at the opposite sides of the slit.- 'These overflow edges face inwardly and are in a cylindrical surface which approximately coincides with the cylindrical inner liquid-surface. They are of approximately the same diameter asthe J overflow edge 3. The several rings or channels are connected together by fa plurality of vertically disposed outlet pipes 6, and the upper ring o'r channel is connected by similar pipes vto outlets 7 through the'top wall when the cylindrical inner surface of this or` cover of the separator.` These outlets` 'l' are arranged in acircleoit` slightly greater diameter than the overflow edge 3.

fIn operation the mixture to be separated is delivered to the chamber and the action of centrifugal force causes the solid matter vA to assume a position lagainst the outer wall 4., and'with its inner surface substantially 1n the form of a parabola. The liquid B forms a layer within the solid matter and liquid reaches the grooves 5, it overflows the edges thereof and is delivered from thesep- .arator through the pipes 6 'and/7.. It will beobvious that the overflow of liquid takes place not only at' the normal overflow 3, but also at both of the annular overflow edges of each of thej grooves. As the liquid flows to these overflow edges from the top` and bottom, as shown by the arrows, the result is that even when only a single ring or channel is used, it affords avlength of overflow edge .double that of the edge 3. By

using a plurality of 'grooves the length of overflow edge is correspondingly mult1plied.'-

' As the overflow liquid is thus distributed over a very greatly increased overfloytr sur- -face the liquid with a uniform inflow of sludge will pass overthe overflow edges at decreased speed and in decreased depth, and with correspondingly decreased capacity for carrying out solid particles.

Having thus described' my invention, what I claim as new and desire to secure by 'Letters Patent is:-

1. A centrifugal separator having an imperforate peripheral wall, `a plurality of annular outlets spaced inwardly from said wall at equal distances from the axis of rotationand at axially spaced points, and means for conducting liquid from each of said outlets and entirelydisposed at a greater distance'from the axis of rotation than are any of said outlets.

2. A centrifugal separator having an im-v perforate peripheral wall,a cover having an annular overflow edge, and a plurality of auxiliary overflow edges of annular form spaced at equal distances from the .axis of rotation and below said cover, and conduits entirely. disposed outward radially beygndI said first mentioned overflow edge for conducting liquid from said auxiliary overflow edges. A

3. A centrifugal separator having a .separator chamber and a plurality of superposed spaced annular members within said chamber, each having a pair of annular overflow,v edges and outlet pipes connected to said members.

4. An overflow mechanism for centrifugal separator'chambers, including a plurality of annular axially spaced inwardly facing channels having outlet pipes connected thereto and serving to'support the same.

n 5. A 'centrifug'al separator having an imperforate peripheral wall, a plurality ofv 'annular'inwardly' facing channels spac'ed inwardly. from said wall atequal distances from ,the axis of rotation and at axially spaced points, the flanges of said'channels presenting overflow'edges for the delivery of liquid from the separator into said channels, and outlet conduits leadingfrom said channels.

`Signed at Bremen, inthe'freeState of Bremen, an'd Republic of Germany,y this 19th day of January, A. D. 1925. v

I DR. GUSTAV me MEER, i Signed in 'the presence ofu FRANCIS J. DUGAN,

LON/A. FRESHAM.

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