An Improved Centrifugal Machine.
Year: 1889

page_text: Date of Application, 26th June, 1889
Complete Specification Left, 5th Feb., 1890-Accepted, 8th Mar., 1890
PROVISIONAL SPECIFICATION.
An Improved Centrifugal Machine.
I, RUDOLF FÖLSCHE of Halle on the Saale, in the German Empire, Civil Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention has for object to render centrifugal machines of the kind used for
the disaggregation of the specifically differently heavy portions of liquids also available
for the filtering, clarifying or washing of substances, sugar for instance, with thorough
impregnation of the same by the filtering or washing liquid.
For this purpose I provide underneath the usual horizontal annular separating disc
a centrifugal straining drum which is charged with the substance to be treated.
This is filtered or washed out by liquid introduced either at the middle or at the
circumference of the drum, either at once or after thorough impregnation by being
allowed to remain for a time steeped in the liquid. This latter is drawn off through
one or more bent tubes arranged at the top of the machine and the substance
centrifugalled in the dry with or without the application of hot air.
Dated this 26th day of Juna 1000
CAPITAINE & VON HERTLING,
89, Chancery Lane, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Centrifugal Machine.
I, RUDOLF FÖLSCHE of Halle on the Saale, in the German Empire, Civil Engineer,
do hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
My invention relates to separator centrifugal machines in which sugar or other fixed
substances are washed out.
The invention has for object to effect in a centrifugal machine a thorough
washing out of the substance under treatment together with a more or less completo
saturation of the same by the washing liquid.
The invention consists in the arrangement of a straining drum within the drum
of a separator centrifugal machine either above, underneath or at the side of the
separating disc. This allows of the sugar or other substance under treatment being
brought into the space comprised between the straining drum and separating disc and
saturated with or separated from the liquid just as desired. By introducing suitable
washing liquid into the space charged with the substance to be treated, this can be
washed out to an almost completely clean state. In order to use as little washing
liquid as possible, the washing out operation is carried out in a battery of centrifugal
machines, clean liquid being supplied to that centrifugal machine in which the
substance is more thoroughly washed out. After this liquid has been utilised for
almost completely cleaning the substance it is drawn off into the next centrifugal
machine and so on to the last of the series from which when it has become
unserviceable it is discharged.
In the accompanying drawing Figs. 1, 2, and 3 respectively are cross sections of a
centrifugal machine shewing three different ways of carrying out my,invention, Fig. 1
shewing the straining drum shut off by the separating disc at top; Fig. 2 the straining
drum shut off by the separating disc underneath and Fig. 3 the straining drum shut
off by the separating disc at the side.
1 is the straining drum located within the impervious centrifugal drum 2.
3 the separating disc which shuts off the straining drum at top (Fig. 1); underneath

page_text: Fig. 2); or at the side (Fig. 3). 4 a bent pipe leading to the space outside the
straining drum 1 separated from this latter by separating disc 3. 6 a second pipe
leading to space 5 formed within the straining drum 1 by separating disc 3.
The substance to be treated is charged into straining drum 1 and the washing
liquid introduced through pipe 6.
In working the centrifugal machine, if the washing liquid becomes heavier by
taking up impurities, as may for example occur in the treatment of sugar, the same is
introduced from within so that upon the penetration of the liquid through the
charge the heavier and more impure liquid will be driven more outwards than the
lighter and cleaner liquid. The used liquid. is drawn off through pipe 4.
the contrary case the liquid is introduced into the material under treatment from
the outer periphery, consequently through pipe 4 and the used liquid drawn off
through pipe 6.
In
If it is desired to remove all the liquid from the substance under treatment, that
is to say, to centrifugal it to dryness, then the liquid is in both cases drawn off through
pipe 4.
I am aware that there are centrifugal machines with an impervious drum which
serve for washing out sugar and other substances. These however have no separating
disc and pipes for the purposes referred to, and according to my experience, they,
owing to the absence of such provision have not been brought into practical
commercial use. I am also aware that there are separator centrifugal machines, but
these serve only for the separation or disaggregation of liquids of different specific
gravities, as they are not provided with the straining appliance which is of the first
necessity to render the centrifugal machine useful for the washing out of fixed
substances.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
In centrifugal machines with pipes of the kind referred to, or such centrifugal
machines as serve for the separation of liquids of different specific gravities, the
arrangement of a straining drum 1 above, underneath, or at the side of the annular
separating disc 3 for the purpose of rendering the same applicable for the treatment
of sugar and other substances to be washed out, substantially as described and
shewn.
Dated this 5th day of Fahruary 1900
CAPITAINE & VON HERTLING,
89, Chancery Lane, London, W.C., Agents for the Applicant.