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Патент USA US2131451

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Sept.'27, 1938.
A. MULLER ~
I
2,131,451
DEVICE FOR SEPARATING A MIXTURE OF FINE AND GOA-ESE MATERIAL PARTICLES
Filed April 16,‘ 1936
I
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##arneys
2,131,451
Patented Sept. 27, 1938
UNITED STATES PATENT- OFFICE
2,131,451
DEVICE FOR SEPARATING A MIXTURE OF
FINE AND COARSE MATERIAL PARTICLES
Adolf Miiller, Niedersediltz, near Dresden, '
Germany
.
Application April 16, 1936, Serial No. 74,674
In Germany April 26, 1935
2 Claims.
This invention relates to a device for separat
.
(c1. 2oa-144)
ing a mixture of ?ne and coarse particles of ma
terial by means of an air current, by which the
particles are entrained, and a separating wheel
3 rotating transversely of said current within a
separating chamber having inlet and outlet
openings but otherwise closed.
Devices of this kind are already known. In
the known constructions the separating wheel
An embodimentof the invention is illustrated
diagrammatically in the accompanying drawing
in which Fig. 1 is a. vertical longitudinal section
on the line A—-B of Fig. 2; Fig. 2 is an .end view. '
Of the supply conduit i for the current of air 5
by which the material is entrained there is shown
only the upper portion with the mouthpiece 2
having an arcuate termination which leads into
the correspondingly formed inlet opening in the
10 which is to remove the coarse material as com
pletely as possible from the mixture ventrained
by the air current is equipped with paddle-like
blades; or, in lieu of paddles, it has been pro
posed to provide the separating wheel with im
pact bodies consisting of bars, chains, ropes or
separating wheel casing 3. The separating wheel
the like. In no case has the precise separation
part of the separating wheel casing 3 and is dis-_
or the coarse material from the ?ne material
been obtained. In the ?rst place, trouble is
charged in known manner by a slowly rotating
wheel 8 presenting compartments. The blades
caused by an additional air current like that pro
5 do not only extend away from the hub to which
they are attached at an angle to an imaginary
radius of such hub and in a direction opposite
to that of their rotation, but they are slightly
duced by a fan which is set up by the wheel
blades, whether of ?at form or of bar form, ro
tating at high speed, as compared to the speed
. of the main air current.
This interferes with
the separating action or the separating wheel,
25 and prevents the exact adJustment of the grade
of separating by altering the speed of the air
current or the number of rotations of the wheel.
A second objection is that the blades are relied
on to eiiect separating over their entire radial .
30 dimensions, and, consequently, di?erent parts
of the blades rotating at di?‘el'ent peripheral
speeds, depending on the radial distance from the
axis of rotation, come into play in the separating
operation and confuse the setting of the sepa
85
rating limit.
,According to the invention, these drawbacks
are substantially avoided by reason that there is
4 allows the ?ne material to enter between the
blades 5.in the direction of the arrow 6 into a
chamber 1, part only of which is shown, to de
posit therein, while the coarse material sepa
rated from the ?ne material collects in the lower 15
curved, being‘ convex on their forwardly-pro
gressing .faces. This construction-increases the
force with which the particles are shoved to the 25
perimeter of the wheel as they progress toward
such perimeter.
What I claim is:
,
'
‘
said supply between said blades in a narrow zone
near the perimeter of said wheel, said directing
' employed for separating only a narrow annular
zone of the separating wheel. Accordingly, of
annulus-substantially coinciding with the axis
‘substantially di?‘er'ent peripheral speeds there‘
comes into action only ‘a single narrow zone
which for practical purposes may be regarded as
rotating at one speed. In order to obtain the
45 maximum separating action from a given size of
separating wheel the inlet opening in the sifting
wheel casing necessary for the air current does
not extend over the entire circumference of a
circle so as to form a complete annular slot, but
50 the cross section of the inlet opening is formed
in the shape of a segment of an annulus regis
tering with the annular zone of the separating
wheel, of such width as to avoid restriction oi!
of said wheel.
2. A device for separating materials comprising
a stationary housing, a rotating separating wheel
carrying transversely extending blades mounted
in said casing, means ‘for supplying a mixture of
air and ?ne and coarse material to said separat
ing wheel and for causing said air to ?ow through
said separating wheel in an axial direction, said
supply means including a slot in said housing
near the Periphery ot'said wheel and a conduit
connecting with said slot, said slotv and the' ad- ‘5
lacent portion of said conduit being in the form
of a segment of a narrow annulus concentric
with the axis of said wheel.
the air ?ow ' by excessive contraction oi.’ the
opening.
-
~
,
1. In a device of the character described, a
source of supply of mixed air and ?ne and coarse '30
particles, a rotatable separating wheel with
transverse curved blades curving away from the
axis of said wheel in a direction opposite to that
of their rotation, and means adapted, to direct
means being substantially a section of an an
nulus in cross-area, the geometric center of said
40 the several annular zones of the wheel having
0
ADOLF M?ILER.
5
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