Improvements in or relating to Centrifugal Separators.
Year: 1899

page_text: Date of Application, 23rd Oct., 1899-Accepted, 10th Feb., 1900
COMPLETE SPECIFICATION.
Improvements in or relating to Centrifugal Separators.
I, OLOF OHLSSON, of Svenska Centrifugaktiebolaget, Södertelje, Sweden,
Mechanical Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to centrifugal separators in which a series of concentric
chambers are provided.
An inset for centrifugal apparatus constructed in accordance with this inven-
tion is shown in the accompanying drawing.
Figure 1 being a vertical section, and
Figures 2 and 3 horizontal sections taken at different heights.
1 is the outer drum or casing of the centrifugal apparatus, and 2 the usual
central supply-pipe for the liquid, which pipe terminates in the space 3 formed
by the double bottom of the apparatus and from which the liquid to be treated
rises into the separating-chamber through apertures or perforations 4.
The inset consists of a number of hollow truncated pyramids or pentagonal
structures 5, hereinafter called pyramids, arranged one within the other and
provided at their vertical corners or angles with rows of perforations 6, said
pyramids being so arranged in relation to one another that radii drawn through
the corners of a pyramid, in a plane perpendicular to the axis of the centri-
fugal apparatus, will intersect at right angles the sides of the pyramid adjoining
it on its outer side, and arranged so as not to touch said corners. The advan-
tage is thus gained that liquid in motion toward the periphery will, in passing
from one pyramid to another, be dispersed in as thin layers as possible on the
inner sides of the pyramids, the result being that separation in process during
the passage of the liquid through an intermediate space is not disturbed and
that light particles of liquid still contained are more readily secreted. In
Figure 3 is shown by arrows 7 how the liquid issuing out of the aperture 6 is
thrown perpendicularly against the inner side of an external pyramid and how
it is spread in opposite currents flowing along said inner side to the nearest
outlets at the corners. It will be readily understood that the spaces imme-
diately behind the sides of the pyramids are left entirely undisturbed in spite
of the passage of the liquid. Light particles still contained in the latter, there-
fore, can be more readily secreted and more easily rise along the outer sides to
the outlet provided for them. This is evidently of the greatest importance for
effecting an efficient separation.
In order that the pyramids may occupy their proper position, as shown, in
relation to one another, when they are inserted into one another, it is a good
plan to provide the inlet-pipe 2 with a longitudinal feather 8, and to provide
corresponding recesses in the upper parts 9 of the pyramids, which parts are
made to embrace the said pipe, said recesses together with the feather serving
as guides for the pyramids. A similar guide 10 may likewise be provided at
the bottom edges of the pyramids. The latter edges are shown bent outward in
such a manner that each of them will fit tightly against the inside wall of the
centrifugal drum, and consequently one or more of the pyramids can be taken

page_text: out or omitted without allowing liquid to ascend between the bottom edges of
the remaining pyramids and the wall of the casing.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1. An inset for centrifugal separators, comprising a number of hollow
pyramids placed one within another and provided at their corners or angles with
perforations, said pyramids being so arranged in relation to one another that
radii drawn through the corners of a pyramid, in planes perpendicular to the
axis of the centrifugal apparatus, will intersect at right angles the sides of the
pyramid adjoining it on the outer side and arranged out of contact with said
corners, substantially as and for the purpose described.
2. The complete inset for centrifugal separators substantially as described or
illustrated in the accompanying drawings.
Dated this 23rd day of October 1899.
BOULT, WADE & KILBURN,
Agents for the Applicant