AN IMPROVED METHOD OF FILTERING IN CENTRIFUGAL MACHINES AND APPARATUS THEREFOR"
Year: 1883

page_text: LETTERS PATENT to Carl Herrmann Haubold of Chemnitz, Saxony German
Empire for an Invention of "AN IMPROVED METHOD OF FILTERING IN
CENTRIFUGAL MACHINES AND APPARATUS THEREFOR"
PROVISIONAL SPECIFICATION left by the said Carl Herrmann Haubold at
the Office of the Commissioners of Patents on the 6th April 1883.
CARL HERRMANN HAUBOLD, of Chemnitz, Saxony, German Empire "AN
IMPROVED METHOD OF FILTERING IN CENTRIFUGAL MACHINES, AND APPARATUS
THEREFOR
"
In filtering apparatus hitherto known, there is a liability of the filtering
material being carried away with the liquid to be filtered when the latter flows in
a rapid current.
To meet this difficulty I cause the liquid to be filtered to pass through the
filtering material in my centrifugal filtering apparatus, not centrifugally, but in an
opposite direction, that is to say from the periphery to the centre, therefore in a
direction opposite to the centrifugal force. The centrifugal power motion of the
filtering itself will then tend to move the filtering outward in such a direction
outward material, in such a manner that the filtering material is continually
compressed more closely and firmly and is never carried away.
In one form of centrifugal apparatus embodying this invention the liquid to be
filtered is admitted to a kind of inverted funnel in the drum. This inverted
funnel widens towards the bottom and with the suitably shaped bottom of the
drum constitutes an annular channel by which the liquid to be filtered flows
towards the sides of the drum and through apertures on the lower exterior rim of
the said funnel into the annular space which is formed by the unperforated wall
of the drum and a perforated inner jacket or lining of somewhat smaller size.
The filtering material is enclosed in a space formed by this jacket and a yot
smaller, also perforated jacket within the same.
The liquid to be filtered is introduced into the rapidly rotating drum through
the above mentioned channel and rises along the sides or wall of the drum, gathers

page_text: therein and, when the flow continues in a centripetal direction, passes through a
lining or jacket, through the filtering material and through a second Jacket and so
gradually fills the drum till the liquid reaches the mouth of a tube and escapes
in a purified state, inasmuch as all the entering liquid has first to pass through
the filtering material.
The drum may be fitted with driving gear below or be driven from above.
Moreover a centrifugal pump may be connected with the driving shaft and draws
up the liquid to be filtered and delivers it through a tube to the centrifugal
apparatus.
The pump may be arranged directly underneath the drum and firmly connected
with its shaft. The liquid to be filtered reaches the pump by a suction pipe, the
former being fitted with a stuffing box; it then flows to the space formed by the
unperforated jacket and the perforated inner jacket, penetrates, as above described,
the filtering material, escaping by a pipe.
Lastly the filtering material may be enclosed on the one hand by the outer
wall and the inner wall and on the other hand by two annular bottoms or pieces.
The outer wall is not perforated beyond having a few apertures on the upper
edge likewise the inner jacket is provided with apertures only at its lower edge,
or the same need not quite reach the bottom of the drum. The lower annular
bottom has apertures on its outer edge the annular bottom likewise has apertures
at its upper edge
The liquid rises underneath the first bottom and along the outer wall passes
through the filtering material and out of the same by the apertures in the upper
bottom and will be thrown off from the upper edge of the jacket.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Carl Herrmann Haubold in the Great Seal Patent Office on
the 6th October 1883.
CARL HERRMANN HAUBOLD of Chemnitz, Saxony German Empire
"AN
IMPROVED METHOD OF FILTERING IN CENTRIFUGAL MACHINES AND APPARATUS
THEREFOR
"
In the ordinary filtering apparatus hitherto known, whatever their construction
there is a liability of the filtering material being carried away with the liquid to
be filtered when the latter flows in a rapid current To meet this inconvenience
the liquid to be filtered is caused to pass through the filtering material in centri-
fugal filtering apparatus not centrifugally but in an opposite direction, that is to
say, from the periphery to the centre therefore in a direction opposite to the
centrifugal force The centrifugal power itself will therefore tend to move the
filtering material outward in a direction opposite to the motion of the fluid to be
filtered in such manner that the filtering material is continually compressed more
closely and firmly and is never carried away.
In the accompanying drawings several improvements in centrifugal apparatus
embodying this system are shewn.
In the centrifugal apparatus shown in figure 1 in vertical section and in
figure 2. in top view the liquid to be filtered is admitted to a kind of inverted
funnel d in the drum. This inverted funnel widens towards the bottom and with
the suitably shaped bottom of the drum constitutes an annular channel d¹. by
which the liquid to be filtered flows towards the sides of the drum and through
apertures on the lower exterior rim of the said funnel d. into the annular
space e. which is formed by the unperforated wall f. of the drum and a perforated
inner jacket g. of somewhat smaller size, and another yet smaller jacket g. 1. as
shewn I give a strongly inclined position to the annular channel d so as to further
by the gravity of the liquid the effect of the centrifugal power, this presents
considerable advantages in comparison with the straight bottom of the drums
The filtering material is enclosed in a space formed by this jacket g. and the
yet smaller also perforated jacket g. 1.
The liquid to be filtered is introduced into the rapidly rotating drum through
the channel d.. and rises through the apertures d.. in the space e. along the side
or wall of the drum, gathers therein and when the flow continues in a centrifugal
direction as indicated by arrows passes through the jacket g. the filtering material
and the jacket g. 1. and so gradually fills the drum till the liquid reaches the mouth
of the tube h. and by this tube escapes in a purified state inasmuch as all the
entering liquid has first to pass through the filtering material.
છું
The drum may be fitted with driving gear below as shewn or may be driven
from above Moreover a centrifugal pump i may be connected with the driving
shaft and draws up the liquid to be filtered and delivered through the tube i to
the centrifugal apparatus.
In the centrifugal apparatus represented in figure 3, the centrifugal pump p. is
arranged directly underneath the drum and firmly connected with the shaft b. the
liquid to be filtered reaches the pump by the suction pipe r, the former being
fitted with a stuffing box at q.; it then flows in the direction of the arrows to the
space formed by the unperforated jacket and the perforated inner jacket s.
penetrates as above described, the filtering material and escapes by pipe t.
Lastly. In figure 4 the filtering material is enclosed on the one hand by the
outer wall v. and the inner wall v. and on the other by the annular bottoms w.
and w.

page_text: The outer wall v. is not perforated beyond having a few apertures on the upper
edge, likewise the inner jacket v. is provided with apertures only at its lower edge
or the same need not quite reach the bottom of the drum.-The lower annular
bottom w. bas apertures on its outer edge, the annular bottom w¹ likewise has
apertures at its upper edge.
The liquid admitted at d. rises as shown by the arrows underneath the bottom w.
and along the outer wall v¹. passos through the filtering material and passes out
of the same by the apertures in the upper bottom w 1. and will be thrown off
from the apertures in the upper edge of the jacket v¹.
Having now described the nature of my said Invention and the manner of
performing the same, I wish it to be understood that what I claim and desire to
protect under the herein before in part recited letters patent in,
First: In centrifugal filtering apparatus the combination of the pressure pipe i. '.
of the centrifugal pump i. with a central jacket or "inverted funnel" d. which at
bottom widens into an annular channel d'. the apertures d.. in whose surface
communicate with the interior of the drum substantially as set forth.
Second: The arrangement of the Centrifugal pump on the rotating axis b of the
Centrifugal apparatus so that the liquid to be filtered is introduced from the
bottom through the pump-casing substantially as set forth.
Third. The arrangement of the covers w. and w¹. perforated at opposite sides
between the jackets or drum-walls v. v. substantially as setforth.
In witness whereof I the said Carl Hermann [sic] Haubold have hereunto set
my hand and seal this first day of October One thousand eight hundred and
eighty three.
CARL HERRMANN HAUBOLD (L.S.)