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Патент USA US3056515

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Oct. 2, 1962
N. v. ANDERSSON
3,056,505
CENTRIFUGES
Filed Oct. 20, 1959
4 Sheets-Sheet 1
Fig.1
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12
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14
1
l/WEIVTOR
NILS VILHELM ANDERSSON
Oct- 2, 1962
N. v. ANDERSSON
3,056,505
CENTRIFUGES
Filed Oct. 20, 1959
4 Sheets-Sheet 2
Fig. 2
0
0
24
0
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lA/VE/VTOR
NILS VILHELM ANDERSSON
Oct. 2, 1962
N. v. ANDERSSON
3,056,505
CENTRIFUGES
Filed Oct. 20, 1959
4 Sheets-Sheet 3
INVENTOR
NILS VILHELM .ANDERSSON
Oct. 2, 1962
3,056,505
N. v. ANDERSSON
CENTRIFUGE'S
Filed 001;. 20, 1959
4 Sheets-Sheet 4
\
l/VVE/VTOR
NILS VILHELM ANDERSSON
United States Patent O??ce
1
3,056,505
Patented Oct. 2, 1962
2
FIG. 5, is a fragmentary section of the diaphragm,
3,056,505
Nils Vilhelm Andersson, Landskrona, Sweden, assignor
illustrating its folded position; and
CENTRIFUGES
FIG. 6, is an axial section through a modi?ed con~
struction of the diaphragm.
According to the drawing a centrifuge provided with
to Aktiebolaget Landsverk, Landskrona, Sweden, a cor
poration of Sweden
Filed Oct. 20, 1959, Ser. No. 847,541
the invention comprises a centrifugal drum or bowl I
mounted with a driving spindle 2 extending axially into
the bowl and a driving motor 3 for driving the spindle
mounted on a frame consisting substantially of a girder
The present invention relates generally to discontinu 10 system 5 arranged on feet 4. The cylindrical surface
ously operating centrifuges and particularly relates to a
of the drum is perforated and provided on the inside
Claims priority, application Sweden July 24, 1959
5 Claims. (Cl. 210-369)
cut-off valve for a central outlet opening at the bottom
thereof with a strainer cloth 6. It is covered by a cover
7 underneath of which an excavator-not shown in the
of the centrifugal drum, through which the material,
such as sugar crystals, subjected to centrifugal treatment
drawing—-is arranged for digging out the material gath
may be discharged from the centrifugal drum. Valves 15 ered on a strainer drum in the form of a cylinder 8. At
for opening and closing the discharge opening of a cen—
the bottom 9 of the bowl 1 are provided central outlet
trifuge are known. They frequently consist of a conical
openings 10, through which the excavated material may,
funnel placed upside down above the outlet opening or
fall downwardly and be discharged from the bowl. These
openings. The funnel is secured to a sleeve, which may
be displaced manually or by means of a pneumatic op
openings are adapted to be closed by means of a cut-off
valve in the form of a diaphragm 14, which is carried
by a sleeve 11 rotatable with the driving spindle 2. The
sleeve is provided at the top with a ?ange .12 and at the
erating contrivance along the spindle carrying the drum.
When the funnel is in its lowermost position, the bottom
openings of the drum are closed, so that the ?lling mass
bottom with a cone 13 secured to the sleeve 11 and in
or pulp which is to be subjected to centrifugal treatment
which the diaphragm 14 is inserted. The sleeve 11 is
may be supplied, without the liquid in the ?lling mass 25 axially slidable on the spindle and is carried by a roller
discharging down through the bottom openings. When
16 supporting the ?ange 12. The roller is arranged on
the funnel is then raised to its upper position upon the
an arm 15, which may have a vertical movement im
termination of the centrifugal treatment, the material
parted thereto by a pneumatic cylinder ‘17, so that the
subjected to the treatment may be scraped off by means
sleeve 11 with the cone 13 is raised in a direction away
of an excavator of known type, and allowed to fall down 30 from the opening into the position indicated by dotted
through the outlet opening in the bottom of the drum,
so that another charge of the material may be treated.
It has been found that in treating baking material, that
or ‘broken lines in FIG. 1.
axially displaceable on the drum driving spindle to be
deformed by the displacement of the- sleeve along the
the sleeve moves upwardly the upward travel of the ring
is limited by a stop 25 so the diaphragm is collapsed
radially inwardly as shown in FIG. 2. In addition, the
diaphragm is stiffened by means of rigidifying members
As will appear from FIGS. 2—5, the diaphragm 14
consists of a circular disk of a flexible material, pref
is to say vault~building material, such as sugar of a high
erably rubber, which is braced by a number of ra
degree of purity, the material forms vaults from the 35 dial struts 19, which are pivotally connected at one
covering tunnel to the inner surface of the drum or to
end ‘with the cone 13, as at 18, and at the other end
the material remaining in the drum, so that the material
with levers or links 20 pivotally secured to the spin
cannot be scraped off by means of the excavator and be
dle 2. These links radially expand the diaphragm
removed through the bottom openings.
in response to downward travel of said :sleeve 11 and
40
These di?iculties are avoided according to the inven
radially contract it inwardly in response to upward travel
tion by making the cut-off valve member comprising a
of said sleeve as hereafter described. The links 20 have
deformable, preferably ?exible and elastic body, that is
one end thereof connected to a ring 24 movable axially
a diaphragm, which is secured to a sleeve and adapted
on the lower large diameter portion of the spindle. When
spindle of the drum in a manner such as to cover the
bottom opening in its entirety, when the sleeve assumes
its lower position. Whereas when the sleeve assumes
‘comprising sector shaped supporting plates 21 radially
its upper position, the valve body has so small a diameter
arranged on the upper side thereof. These plates are
that the material may pass between the valve body and 50 riveted to the respective struts 19 and have a curved con
the inner surface of the drum or the material remaining
?guration with a concave lower side and form rigidi?ed
in the drum without building any vaults.
sectors on the diaphragm as illustrated in FIG. 3.
According to one embodiment of the cut-off valve, a
In the position shown in solid lines in FIG. 2, the
sprayer screen is arranged on the sleeve above the dia
diaphragm has a slightly conical shape with an apex
phragm' The screen is adapted, in the ?lling of the
portion circumferentially of said sleeve and a base por
drum with material, to throw a portion at least of the
tion thereof has so large a diameter that a peripheral
?lling mass directly out against the inner surface of the
marginal edge portion seats on a circular valve seat
drum, Without the ?lling material ?rst touching the dia
phragm.
The invention will be described in more detail with
reference to the accompanying drawings, which illustrate
formed by the bottom 9 coaxial with the bottom opening
60
or openings to cover the outlet openings :10 in their
entirety. When the sleeve 11 is raised selectively in a
direction away from its seat for opening the valve, the
diaphragm is contracted radially inwardly so that the
parts V19, 20 and 21 will take the positions indicated by
a centrifugal drum provided with a cut-off valve accord
ing to the invention and in which:
FIG. 1, is a vertical view of a centrifuge partly in 65 broken lines. The portions of the diaphragm lying be
tween the sectors formed by the supporting plates 21
section provided with a valve according to the invention;
will
thus be folded in the manner shown in FIG. 5. The
FIG. 2, is a fragmentary view on an enlarged scale
concavity of the supporting plates imparts to the inter
of a vertical view of the valve of the invention;
mediate portions a tendency to ?ex inwardly. In its
FIG. 3, is a plan view of the valve;
position, the diaphragm has a diameter small
FIG. 4, is a fragmentary section through a portion 70 collapsed
enough to permit the vcentrifuged material to pass out
of the diaphragm and its supporting plates in an expanded
position of the diaphragm;
thrciugh the openings 10 without any risk of forming
vau ts.
3,056,505
4
comprising a collapsible conical diaphragm having an
apex portion mounted circumferentially of said sleeve for
3
Another construction of the diaphragm and associated
parts is shown in FIG. 6. In this construction the outer
part of the diaphragm 22 is double-folded and stiffened
by means of resilient insets of steel wires, for example,
axial travel therewith and a base portion comprising a
peripheral marginal inner edge portion movable radially
outwardly of said sleeve selectively into a position seated
on said circular valve seat, means for selectively axially
displacing said sleeve axially on said spindle, means re
sponsive to said axial displacement of said sleeve for con
the position indicated by broken lines in the ?gure.
tracting the diaphragm radially inwardly to uncover said
As shown in FIG. 1, the valve device may be pro
vided with a sprayer screen 23 secured to the sleeve 11. 10 discharge opening when the sleeve is moved in a direc
tion away from said seat and for expanding the dia
This screen is adapted, in the ?lling of the centrifuge, to
phragm and causing said edge portion to seat on said
throw at least a portion of the ?lling material out against
valve seat thereby to close said opening when the sleeve is
the inner side of the centrifugal bowl during ?lling of
moved axially in the opposite direction on said spindle,
the centrifuge. Consequently, the ?lling material does
not hit the diaphragm 14. This arrangement is of par 15 said means responsive to said sleeve displacement being
arranged internally of said conical diaphragm, and angu
ticular advantage in connection with ?lling materials which
larly spaced rigidifying members ?xed angularly spaced
are otherwise di?icult to distribute along the inner sur
on said diaphragm forming rigidi?ed sectors thereon cor
face of the bowl 1.
responding to said members.
What is claimed is:
3. In a centrifuge according to claim 2, including means
1. In a centrifuge having a driven bowl having a bottom
pivotally connecting said rigidifying members to said
provided with a central discharge opening and circular
sleeve.
valve seat coaxially with said central opening in said
4. In a centrifuge according to claim 2, in which said
bottom, a driving spindle extending axially into said bowl,
so as to bear with a resilient pressure in its closed posi
tion on the inner edge portion of the bottom 9 and to
seat thereagainst, while in the open position it assumes
rigidifying members are arcuate in cross-section to assist
a sleeve axially slidable on said spindle, a valve member
comprising a collapsible conical diaphragm having an 25 in forming radially extending folds in said conical dia
phragm when said valve member is moved radially in
apex portion mounted circumferentially of said sleeve
wardly toward said sleeve.
for axial travel therewith and a base portion comprising
5. In a centrifuge according to claim 2, in which means
a peripheral marginal edge portion movable radially out
responsive to said axial displacement of said sleeve com
wardly of said sleeve selectively into a position seated
on said circular valve seat, means for selectively axially 30 prises a plurality of angularly spaced links disposed ex
tending radially inwardly toward said spindle, means pivot
displacing said sleeve axially on said spindle, means re
ally connecting one end of each link to the diaphragm
sponsive to said axial displacement of said sleeve for
and means pivotally connecting the opposite end of each
contracting the diaphragm radially inwardly to uncover
link to a point adjacent the periphery of said spindle, and
said discharge opening when the sleeve is moved in a
direction away from said seat and for expanding the 35 means allowing the last-mentioned pivot means to travel
axially a relatively lesser extent than said sleeve travels
diaphragm and causing said edge portion to seat on said
when displaced and in response and correspondence in
time and direction with said sleeve displacement.
valve seat thereby to close said opening when the sleeve
is moved axially in the opposite direction on said spindle,
and said means responsive to said sleeve displacement
being arranged internally of said conical diaphragm.
40
2. In a centrifuge having a driven bowl having a bottom
provided with a central discharge opening and circular
valve seat coaxially with said central opening in said
bottom, a driving spindle extending axially into said bowl,
a sleeve axially slidable on said spindle, a valve member 401
References Cited in the ?le of this patent
UNITED STATES PATENTS
706,441
2,037,655
2,890,716
McLaughlin __________ __ Aug. 5, 1902
Roberts _____________ __ Apr. 14, 1936
Werder _____________ __ June 16, 1959
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