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Патент USA US2873920

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Feb. 17, 1959
Filed March 11,‘ 1955
Z'SheetS-Sheet 1
Feb. 17, 1959
Filed March 11, 1955 _
2 Sheets-Sheet 2
United States Patent ice“
’ ‘Patented Feb. 17, 1959
would be dependent on the excess pressure of the con
trol liquid for actuating the valve over the pressure of
the closure liquid in the closure chamber.
Separator A. G.,' Oelde (Westphalia), Germany, 'a Ger
Application March 11, 1955, Serial No.49s,s99 '
Claims priority, application Germany March 13, 1954
charging centrifugal separator ,having a quick-acting dis
charge valve for discharging liquid from the closure
chamber, which is actuated by the same liquid feed "as
used to ?ll the closure chamber with liquid, and which
is not actuated to its open position against the liquid
Peter Steinacker, Oelde, Germany, a‘ssignor to Weslfalia
man corporation .
One object of this invention is an improved sludge-dis~
pressure in the'closure chamber. These, and still further
'10 objects will become apparent from the following de
8 Claims. (Cl. 233-20)
scription, read in. conjunction with the drawings, in
Fig. 1 shows a vertical sectionfof the left-hand side
This invention relates to improvements in sludge-dis
of an embodiment of‘a centrifugal separator in accord
ance with’ the invention, with the sleeve valve in vthe
charging centrifugal separators. The invention more
particularly relates to an improved valve arrangement
for sludge-discharging centrifugal separators.
Centrifugal separators which have bowls from which
accumulated sludge may be periodically ‘discharged, are
known. These separatorsmay have a centrifugal'bowl
with peripheral‘sludge-discharge openings, which may be
' closed position;
Fig. 2 shows a vertical ‘section of the right-hand side
of the centrifuge shown in-Fig. l with the sleeve valve
in the‘open position;
Fig. '3 is a vertical section showing in further detail
the liquid-release valve from the closure chamberof the
opened and closed by an‘axially' movable ‘sleeve valve.
In operation, the sleeve valve is'normally maintained
in a position sealing'the sludge~discharge openings, so
that sludge accumulates in the v‘bowl. After a certain
period of operation and the accumulation of the sludge, '
the sleeve valve is moved to a' position in which the
sludge-discharge ports are open and the- sludge is, dis;
embodiment of a valve construction for emptying the
closure chamber in accordance with the invention.
introduced to this closure chamber, and, due to‘ the
and sleeve valve to the open position.
embodiment showns in Figs. 1 and 2; and’
. Fig. 4 is a vertical section showing in detail a different
The invention basically relates to improvements in a
sludge-discharging centrifugal separator having a cen-‘
trifugal bowl with peripheral sludge-outlet openings and '
charged from the bowl therethrough.
an axially movable sleeve valve movable between a posi
The movement of the sleeve valve may be effected by 80_ tion opening and a position closing the sludge-discharge
the pressure in the centrifugal bowl and/ or by providing ' openings. The centrifuge'also has an inwardly extending
radial ?ange, preferably de?ning the upper ‘or lower sur
the same with an inwardly projecting radial ?ange and
face of the bowl interior. The radial ?ange is connected
introducing liquid below and/or above the ?ange to
to the sleeve valve ‘and de?nes a closure chamber on,
move the sleeve valve in either direction.
Thus, for example, the centrifugal bowl may comprise 35, the“ sidethereof outward of the interior of the bowl for
passage of liquid therein under centrifugal pressure for
an outer casing and the inwardly projecting radial ?ange
the closing actuation of the sleeve valve. The opening
connected to the sleeve valve may form the top or bot~
actuation of the the sleeve .valve is effected by allowing
tom surface of the bowl interior.- The radial ?ange may
be spaced from the adjacent casing wall of ‘the bowl to 40 the liquid to ?ow. out of the closure chambern whereby
form a closure chamber therebetween. Liquid maybe . thelcentrifugal’ pressure in the bowl will force the ?ange
" In accordance with theyin'vention, the centrifuge is
centrifugal force, will hydraulically force the radial
provided with a valve port de?ning a path of liquid
?ange and sleeve-valve to the closed position. If the
liquid is allowed to escape from this closure chamber, 45 ?ow out from, the peripheral portion "of the closure
the pressure in the bowl will force the radial ?ange and J .. chamber. A valve body is movably positioned between
A a position opening and a position sealing the valve port.
sleeve valve in the oppositejdirection opening the dis
The movement of the‘ valve body from said open to said
charge ports and‘ allowing escape of the accumulated
sealing position is against liquid under centrifugal pres
sludge; When the centrifugal separators operate at a
high speed of rotation, it is of extreme importance that 50 sure'in said closure chamber. A valve chamber is pro
vided in pressure communication with the side of the
the discharge ports are opened suddenly, so that the
valve body substantially opposite the valve port. Pres
sludge which has collected within the bowl can be de
sure communication is preferably indirect through a
pendably carried out of the bowl by the sudden differ?
deformable diaphragm which is in contact with the valve
ential pressure produced across the discharge ports. If
the ports are Opened too slowly, a good deal, of wear of 55 body but which seals the same from_ direct contact
with the liquid in the valve chamber.
.A throttle discharge opening is de?ned through the
peripheral portion of the valve chamber. A common
clogging often results in causing imbalance of the bowl,
liquid inlet is provided for passing liquid into the valve
endangering further centrifugal operation.
, '
In all prior proposals, utilizing a valve to empty the 60 chamber and, into the closure chamber, preferably so
closure chamber, a special ?uid feed in addition to the , that the liquid ?rst ?ows into the. valve chamber‘ and
feed for the closure liquid was required for the actuation ' then over?ows into the closure chamber. The liquid
inlet means and the throttle ‘discharge must be so con
of the valve. This ‘necessitated, particularly in the case
structed that liquid may be passed in through the liquid
of ' automatically controlled centrifuges, a complicated
inlet faster than the same will be forced out by cen-V
control system due to the alternate control of the liquids
the packings may occur, and the danger exists that the
ports themselves will become partially cloggedf Such a '
for the closure chamber and actuation of the valve,
.. trifugal force through the throttle discharge.
With this construction, upon the shutting off'of the clos-_
which was necessary. Further, in the prior suggestions, ' '
ure liquid feed passing through the liquid inlet means, the:
theclosure of the valve was aided by the pressure of the
liquid in the valve chamber is forced by centrifugal force
liquid in the closure chamber, so that the valve had to
through the throttle discharge, so that the valve experi
be brought to its open position against this pressure.
This arrangement would not'allow as rapid an action of’ _, ,_ ences. a‘ sudden releaseof pressure onvone side, while the
the’valveas‘was desirable, ‘since the speed of actuation
pressure of the liquid in the closure chamber on the'othe‘r'
side acts in the opening direction, rapidly moving the valve
body to open the'valve'port. The valve port and the con
duits leading therefrom to the exterior of the centrifuge
are, so dimensioned that the liquid in the closure, chamber
than the closure chamber 14%.
shaft 22 by any suitable drive means, such as an electric
fullest extent on the layer of sludge, so that clogging of 10
screwed together by means of a thread'3.
' "
In place of the cylindrically shaped valve body 12 as
shown in Figs. 1, 2, and 3, a ball-shaped valve body 21
may be utilized, as shown in Fig. 4.
In operation, the centrifugeds rotated by driving the
is, instantly thrown out when ‘the valve is opened. Due
to the sudden emptying of the closure chamber, the sleeve
valve and ?ange are quickly moved, causing sudden open
ing of the sludge-discharge openings, so that the pressure
in the centrifugal bowl will act instantaneously to its
the sludge in the outlet openings is practically impossible.
Referring to the embodiment shown in Figs- l, 2, and
3, the sludge centrifuge consists of a centrifugal bowl
which has been prepared in two sections, and having the
lower bowl portion 1 and upper bowl portion 2, joined or
The valve'chamber 11 reaches nearer to the bowl_ periphery
A closure liquid, such as water, is passed in
through the inlet 8. Due to the centrifugal force, the
liquid ?rst passes through the channels 9 and. into the
valve chamber 11, completely ?lling the same. The hy
draulic pressure caused by the centrifugal force presses
on the diaphragm 20, forcing the valve body 12 toward
the valve port 13, sealing the same. As the valve cham
15 ber 11 ?lls, the 'closure'liquid, such as the water, con
tinuously ?ows out of the same, through the throttle open
ing 15. The inlet 8 and the throttle opening 15 should
The bowl is centrifugally rotated by means of the shaft
22 driven by any suitable drive means (not shown),
be so dimensioned that the liquid may be passed in
. The centrifugal bowl has the peripheral sludge and dis:
through the inlet 8 at a faster rate than the same is cen
charge ports or openings 7 and the sleeve valved, which is 20 trifuged out through the throttle opening 15. The liquid
axially displaceable between the position as shown in Fig.
will thus ?ll the entire chamber and over?ow into the
lyin sealing contact against the packing gasket 5 closing
closure chamber 14. In the closure chamber 14 the liquid
the sludge-discharge ports 7 and“ an opening position, as
will build up hydraulic pressure, due to the centrifugal
shown in Fig. 2, opening the sludge-discharge ports 7 for
communication with the interior of the bowl.
aetion. Since, however, the hydraulic force of the liquid
25 in the valve chamber 11 is greater than in the closure
An inwardly extending radial ?ange 23. is connected to
and. movable with the sleeve valve 4. The radial ?ange
23 forms the upper surface of the bowl interior and is
spaced from the adjacent casing wall of the centrifugal
chamber 14, because the diaphragm 20, on which the liquid
in the valve chamber 11 acts, has a greater surface area
than the surface area of the valve body 12 acted upon
' by the liquid in the closure chamber 1.4, the valve body
bowl, so as to de?ne a closure chamber 14. When liquid
is passed into the closure chamber 14 while thebowl is
pressure in the chamber 14 will act on the sleeve valve
12 will remain in the closed position. The hydraulic
rotating, the centrifugal force will force the ?ange 723 and
4 and ?ange 23, forcing the sleeve valve to the closed
position, as shown in Fig, 1. If the closure liquid com
'- pletely ?lls the conduits 9 and 1,0, the same then over
35 ?ows via port 25.
tion of the closure chamber 14.
' A valve body which, as shown in Figs. 1, 2, and 3, has
The liquid material to be de-sludged or clari?ed, is
a cylindrical shape, is axially movable between a position
passed in the centrifuge in the conventional manner
as shown in Fig. 1, sealing the valve port, and a position
through the inlet v24. The same is clari?ed by the cen~
as shown in Fig. 2, opening the valve port 13. The move
t_rifugal action in the bowl and the sludge builds up at the
ment of the cylindrical valve body 12 to. the sealing posi 40 V- or wedge-shaped peripheral portion of the bowl.
tion is against any liquid pressure in the closure "cham
After the sludge has been allowed to accumulate for a
ber 14.
period of time, the valve in the inlet 8 is closed.
When the valve body 12 is in the open position, the
The liquid in the valve chamber 11 will be forced out
valve port 13 is in liquid ?ow communication with an an
through throttle opening 15, emptying the valve chamber
nular space 17 surrounding thevalve body and the con: 45 11 and relieving the hydraulic pressure on the dia
duits 18 and 19 which lead to the exterior of the'centri
phragm 20.
fugal bowl, allowing the emptying of the closure chamber
The hydraulic pressure in the closure chamber 14 will
14’ of any liquid, due to centrifugal force.
then act on the valve body 12, quickly forcing the same
‘A channel 9, 10 and the valve chamber 11 are in pres
into the open position. Due to its elasticity, the dia
sure communication with the side of the valve 12 opposite 50 phragm 20 does not hinder the movement of the valve
the valve port. As shown, the pressure communication
body 12. The closure liquid in the closure chamber 14
is through an elastic deformable diaphragm 20 in contact
is then rapidly centrifuged out through the annular open
with the valve body 12. The diaphragm 20 allows liquid
ing 17 and the conduits 18 and 19 to the exterior of the
pressure in the valve chamber 11 to be fully utilized to ' centrifuge. With this rapid removal of the liquid in the
move the valve body 12 to seal the valveport 13. The 55 closure chamber, the centrifugal pressure of the liquid
diaphragm 20 also preferably seals the valve body 12 and
in the centrifugal bowl acts on the ?ange 23 and sleeve
sleeve valve 4 to the closed position, as shown in Fig. l.
A valve port 13 is provided through the peripheral por
the portions of the chamber in which the same moves
from direct contact with liquid in the valve chamber 11,
valve 4, quickly forcing the same upwardly to the open
position, as shown in Fig. 2, The centrifugal pressure
and this prevents any leakage through the valve guide.
in the bowl then instantaneously acts upon the sludge,
This is very advantageous, since, even when pure water 60 which has accumulated, quickly forcing the same out
is used as the closure liquid, extremely ?ne'impurities
through the sludge-discharge ports 7.
readily settle out under centrifugal force in the valve guide.
After the sludge has been removed, the valve in the
The diaphragm 20 may also act as a seal to prevent any
inlet 8 is opened, the liquid flows into the valve chamber
communication between the closure chamber 14 and valve
11, exerting force on the diaphragm 20, closing the. valve
chamber 11. The guide for the valve will thus at all times 05 port 13 by moving the valve body .12“. The liquid then
remain clean, so that the valve cannot seize.
again overflows from the portion 9 into the closure cham
A throttle discharge opening 15 through the peripheral
portion of the valve chamber provides a passage'for'liquid
bar 1.4, thus twins the radial ?ange Z3 and the sleeve
valve 4 to the closed position.
out of the valve chamber 11 and the channels 10 and 9.
The valve arrangsmspt is accordance with the inven
A liquid inlet 8, which is controlled by a valve, is posi 70 tion is, of course, also applicable for sludge centrifuges
tioned for passing liquid through the channels 9 and 10
in which the sleeve valve is arranged in the lower part of
into the valve chamber 11- and vover?owing the same into
the centrifuge bowl.
the, closure chamber .14- The channels Jami-10 and the
closure chamber 14 extend Substantially Parallel to sash '
other inward toward the axis of rotation of the sentrifqser
1 claim:
1- In a, sentriifysal separate! having ‘a ssptrifugal bowl
with peripheral eludes-splat swings and an axially
movable sleeve valve, movable between a position open
4. Improvement according to claim 3, in which said
feeding channel for said valve chamber and the closure
chamber extend substantially parallel to each other.
an inwardly extending radial ?ange connected to said
5. Improvement according to claim 1, including a
sleeve valve, de?ning a closure chamber on the side
thereof outward the interior of the bowl for the passage 01 deformable diaphragm positioned in contact with said
valve body and sealing said valve body from direct con—
of liquid therein under centrifugal pressure for the closing
tact with liquid in said valve chamber.
actuation of said sleeve valve, the improvement which
6. Improvement according to claim 5, in which said
comprises a valve port de?ning a path of liquid ?ow out
valve body is a cylindrically shaped, axially movable valve
from the peripheral portion of said closure chamber, a
valve body movably positioned between a position open 10 body.
7. Improvement according to claim 5, in which said
ing and a position sealing said valve port, said valve
valve body is a ball-shaped valve body.
body being positioned with respect to said valve port and
8. Improvement according to claim 1, including a de
closure chamber so that said movement from said open
formable diaphragm positioned in contact with said valve
to said scaling position is against any liquid pressure in
said closure chamber, a valve chamber in pressure com 15 body and sealing said valve body from direct contact with
liquid in said closure chamber and including an annular
munication with the side of said valve body substantially
channel surrounding said valve body in ?ow communi~
opposite said valve port, a throttle discharge opening de
cation with said valve port when said valve body is in the
?ned through the peripheral portion of said valve cham
position opening said valve port and means de?ning a
her, and common liquid inlet means for passing liquid
into said valve chamber and into said closure chamber. 20 path of liquid ?ow from said annular channel to the
exterior of the centrifugal bowl.
2. Improvement according to claim 1, in which said
ing and a position closing said sludge-discharge openings,
valve chamber, closure chamber, and inlet means are
positioned so that liquid from said inlet means will flow
. into said valve chamber and over?ow therefrom into said
References Cited in the ?le of this patent
closure chamber.
25 2,578,484
3. Improvement according to claim 2, including at
least one feeding channel for said valve chamber and in
which said feeding channel and said closure chamber
extend toward the axis of rotation of the centrifugal bowl
with the closure chamber being positioned closer to the 30
bowl interior than the valve chamber.
Nyrop ______________ .._ Dec. 11, 1951
Great Britain _________ __ Nov. 2, 19s:
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