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Патент USA US3085753

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April 16, 1963
P.$TE1NACKER ETAL
3,085,743
SLUDGE DISCHARGING CENTRIFUGAL SEPARATORS
Filed Jan. 16. 1959
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INVENTORS
PETER STEINACKER
v
‘
_
as
HEINRICH
HEMFORT
30
ATTORNEYS
nited States Patent O??ce
1
2
3,085,743
again discharges out of the peripheral conduits. If this
continuous feed, however, exceeds the discharge rate
through these conduits, the control water collects in the
opening chamber and will force the sleeve valve down
SLUDGE DISCHARGING CENTRIFUGAL
SEPARATORS
Peter Steinacker and Heinrich Hemfort, Oelde, West
phalia, Germany, assignors to Westphalia Separator
AG., Oelde, Westphalia, Germany, a German corpora
tion
Filed Jan. 16, 1959, Ser. No. 787,309
Claims priority, application Germany Feb. 11, 1954
10 Claims. (Cl. 233-20)
This invention relates to improvements in sludge dis
charging centrifugal separators, and is a continuation-in
part of copending US. application, Serial No. 433,708,
?led June 1, 1954, now abandoned.
Centrifugal separators which have bowls from which
accumulated sludge may be periodically discharged are
known.
3,085,743
Patented Apr. 16, 1963
These separators may have a centrifugal bowl
ward and hold it in the open position. If, on the other
hand, the continuous admission to the closure chamber is
less than the amount lost by evaporation, etc., the amount
of control water in the closure chamber will gradually
decrease to below the amount required to maintain the
10 sleeve valve closed.
A further disadvantage of conventional sludge dis
charge centrifugal separators is the fact that the opening
of the sludge discharge outlets often takes place too
slowly.
This occurs because the mass in the closure
chamber is somewhat inwardly displaced upon moving the
sleeve valve to opened position, increasing the working
surface area of said sleeve valve as it so moves. Further_
more, an increase in countcrpressure results in the clo
with peripheral sludge discharge openings which may be
sure chamber acting to retard the opening of said valve,
opened and closed by an axially movable sleeve valve. 20 necessitating additional ?lling of the opening chamber
The sleeve valve may ‘be hydraulically operated in one or
and an increase in the ?lling time. These actions delay
rapid opening of conventional sludge discharge outlets.
both directions.
For this purpose the bowl may have a bottom insert
As a consequence, the rinsing liquid fed to the drum for
which forms the bottom surface of the bowl interior.
removing the sludge may break through the cake of
This bottom insert has a lower surface positioned in 25 solids formed along the separator wall during sludge
spaced relationship to the upper surface of the bottom
separation, thereby causing any advantageous pressure
portion of the bowl casing. The sleeve valve has an
build-up to be lost. Under these conditions, the solids
inwardly extending ?ange or plate which is positioned in
may be only partially expelled so that strong imbalances
this space and divides the same into an upper opening
chamber and a lower closing chamber. The control is
effected by introducing a control liquid such as water into
the opening chamber above the ?ange, or into the closure
chamber below the ?ange. Due to the centrifugal force
of the rotating bowl, the liquid acts under pressure in
these chambers. There is, thus, produced in one of the
of the rotating drum may occur.
It is an object of the present invention, therefore, to
overcome the above disadvantages of variations in rate
of feed of the control liquid to the opening chamber and
slowly opening sludge discharge outlets.
It is another object of the invention to provide a sludge
discharge centrifugal separator construction wherein the
closure chamber has a smaller radially extending work
ing surface area and a correspondingly greater annular
or longitudinally extending working surface area with
respect to the axis of rotation of the separator.
In some embodiments both chambers are ?lled 40
It is a further object of the invention to provide a
two chambers an excess pressure which effects the down
ward or upward movement of the sleeve valve whereby the
sludge discharge openings are exposed or closed.
Various embodiments of such control systems are
known.
independently of each other with control liquid through
closure chamber construction whereby the opening and
closing of the sludge discharge openings of a centrifugal
bers have a common feed channel.
separator may take place rapidly, particularly in moving
In the case of centrifugal separators of the latter type,
the sleeve valve into opened position.
the opening chamber may have small discharge conduits 45
Other and further objects of the present invention will
at its outer periphery through which the control liquid
become apparent from a study of the within speci?cation
may leave the chamber. In order to effect opening of
and accompanying drawing in which:
channels or holes while in other embodiments, the cham
the sleeve valve for the discharge of the sludge, more
FIG. 1 shows an embodiment of a centrifuge in ac
control liquid is introduced into the opening chamber
cordance with the invention, with the sleeve valve in the
than can be discharged through its peripheral conduits. 50 closed position, and
As a result, the liquid builds up in the opening chamber
FIG. 2 shows the embodiment shown in FIG. 1 with
and a centrifugal pressure head is formed which forces
the sleeve valve in the open position.
the inwardly extending ?ange and the sleeve valve down
The centrifugal separator, in accordance with the in
ward and displaces the control liquid present in the
vention, has a closure chamber developed as a storage
closure chamber. After the sludge has been discharged, 55 chamber which will not force all of the material used for
effecting the closing actuation therefrom even when the
the control liquid introduced into the opening chamber
sleeve valve is in the open position. At least a predeter
is throttled or interrupted so that the same may dis
charge through the peripheral conduits.
mined portion of the mass which is ?owable or deform
The control
able under centrifugal force is permanently contained in
liquid at the same time is allowed to build up in the
closure chamber so that the pressure of the centrifugal 60 the closure chamber. This mass, for example, may con
sist of a liquid which does not evaporate even at increased
head in this chamber exceeds that in the opening chamber
temperature or a plastic or elastic mass.
and the sleeve valve is moved upwardly to close the
sludge discharge openings.
In general, water is used
The closure chamber should be outwardly sealed, but
may he provided with an opening in its end portion a
as the control liquid.
In order to effect a dependable closure of the sleeve 65 predetermined distance from the axis of rotation of
the centrifuge through which the centrifugally deformable
valve, a continuing small feed of water must be main
closure material may ‘be introduced and from which the
tained after the re?lling of the closure chamber particu
excess of this material over the predetermined amount
larly when centrifuging at high temperature in order to
desired may be discharged upon the ?rst sludge removal.
equalize any losses occurring by evaporation, leakage or
Since at least a predetermined amount of the centrif
the like. In this connection passage of the control water 70
ugally deformable mass used for the closing actuation
from the closure chamber into the opening chamber is
permissible to a certain extent inasmuch as this water
of the valve is substantially permanently positioned in
I
3
4
the closure chamber and is merely deformed outwardly
upon closing actuation and ?attened out upon opening
In the preferred embodiment of the invention, wherein
a llowable mass is used in the closure chamber, one or
actuation, no feed channel is required into the closure
chamber, and the closure chamber no longer need be
in communication with the opening chamber.
Ca
The inwardly extending flange which is connected to
the sleeve valve preferably extends to adjacent the hub
of the centrifugal bowl so that the opening liquid may
exert a force on a larger area than in previously known
embodiments.
The closure material, furthermore, acts
in the open position of the sleeve valve on a larger area
than in the closed position. Thus, this material will exert
a larger force at the beginning of the upward movement
of the valve where it is needed to overcome the starting
friction.
When an elastic material as, for example, rubber is
used as the closure material, a preliminary stressing of
this material in the form it takes when the sleeve valve
is closed may be effected so that the initial force exerted
on the sleeve valve in its movement from the open to
the closed position is further increased to overcome the
starting friction which, as is well known, is greater than
the sliding friction.
It has been found also in accordance with the present
invention that by providing an increased distance, in a
longitudinal direction with respect to the axis of rotation,
between the flange connected to the lower portion of the
sleeve valve and a portion of the bottom of the bowl
casing, as by an annular extension in said bowl casing
bottom, when the sleeve valve is in closed position the
working surface area of the deformable mass in the
closure chamber during rotation is only slightly increased
radially inwardly upon movement of the sleeve valve
to the opened position. Moreover, in accordance with
the invention, the effective surface area on which the
closing deformable mass may exert its force is consider
ably diminished in the peripheral portion of the closure
chamber farthest from the axis of rotation, that is, where
the force of said mass is greatest, upon moving the sleeve
valve to opened position, while the remaining effective
surface area as aforesaid is only slightly increased in a
direction towards the axis because of such annular e'x
tension. Consequently, upon movement of the sleeve
valve into opened position, as when liquid is conducted
to the opening chamber in conventional manner, the
counteracting force of the deformable or flowable mass in
the closure chamber is considerably less than that exerted
in conventional separators, permitting speedy movement
more limiting exit tubes or channels connecting said
closure chamber with the outside are provided whereby
a given quantity of said mass will always be present in
said chamber. These tubes project into said chamber a
predetermined distance, or are positioned at a point in
the chamber wall a given distance from the axis, so that
a sufficient quantity of tlowable mass will always be pres
10 ent in said closure chamber.
Among the deformable or flowable mass materials
which may be used in accordance with the invention are
any ?owable plastic and elastic materials, any deformable
plastic and elastic materials, water, and water-based de
formable or llowable materials, all of said materials being
capable of deforming or flowing under centrifugal force
and preferably being liquid.
The term “llowable mass” or “flowable material” as
used in the appended claims is meant to embrace and
include both flowable and deformable masses and mate
rials of the type immediately hereinabove set forth.
It will be seen, therefore, that the present invention
advantageously provides a closure chamber in centrifugal
separators having a widened annular space portion into
which the deformable or llowable mass may be directed
during movement of the sleeve valve into opened position
with only a slight increase in working surface area in a
radially inward direction. Furthermore, the invention
provides such a closure chamber having a varying vol
ume peripheral portion in which the working surface
area decreases during movement of the sleeve valve to
opened position correspondingly decreasing the force of
the ?owable or deformable mass thereat, and increases
during movement. of said valve to closed position corre
spondingly increasing the force of said mass thereat.
Consequently, the closure chamber construction of the
invention enables the sleeve valve to respond rapidly to
open and close the sludge discharge openings, due to the
immediate decrease in the force of the ?owable or de
formable mass upon moving said sleeve valve to opened
position and the immediate increase in the force of said
mass upon moving said sleeve valve to closed position,
respectively.
The invention may be further described in greater detail
with reference to the embodiment shown in the accom
panying drawings.
The centrifugal bowl'is composed of the lower casing
part 1 and the upper casing part or cover part 2, which
of the sleeve valve from closed to opened position. Con
are connected to each other by means of the locking ring
versely, it will be seen that upon dis-continuing liquid to
the opening chamber, due to the centrifugal force acting 50 3. The bowl is mounted for rotation with the spindle 28
in the conventional manner. The bowl casing is provided
on the deformable or flowablc mass, the sleeve valve will
with peripheral sludge discharge openings or ports 20. A
be forced toward the closed position enabling more and
sleeve valve 21 is axially movable within the bowl be
more of said mass to occupy the peripheral portion of the
tween a position shown in FIG. 1 of the drawing in which
closure chamber, whereby said valve will be quickly and
55 its upper edge contacts the gasket 22 and seals the dis
completely forced to closed position.
charge openings Ztl and a lower position shown in FIG.
Constructions in accordance with the present invention,
2 of the drawing in which its upper edge is in spaced
such as those above described, therefore, favorably pro
relationship to the gasket 22 opening the sludge discharge
vide for the etlicient and rapid opening and closing of
openings 20.
the sludge discharge openings, utilizing the centrifugal
A bottom insert member 6 de?nes the lower surface
force of the separator to advantage. Speci?cally, the 60
of the bowl interior and is spaced from the bottom 5 of
cake of solids deposited in the drum during separation
the bowl casing to define a free space therebetween. The
of the sludge from the accompanying liquid will be com
distributor 4 which extends axially upward to the central
pletely discharged from the drum under the pressure of
portion of the bowl is formed as an integral portion of
the rinsing liquid, eliminating any possible imbalancing
of the drum, since the sleeve valve is quickly moved into 65 the bottom insert member 6. This distributor distributes
opened position. Conversely, the sleeve valve is quickly
moved into closed position, since the deformable mass
material introduced into the centrifuge through the con
duit 19 in the bowl through the conduit 23.
passes immediately into the space formed in the periph
eral portion of the closure chamber, where the force of
The bottom insert member 6 has an outer annular
guide surface 8 which acts as a sliding guide for the
said mass is greatest, upon initial movement of the sleeve 70 sleeve valve 21.
valve toward the closed position. Because of such great
force the sleeve valve is caused to complete its movement
to the closed position rapidly, without noticeable displace~
ment of the deformable mass toward the peripheral por
tion of the closure chamber.
A ?ange 10 is connected to the lower portion of the
sleeve valve 21 as an integral part thereof and moves
therewith.
This ?ange 10 extends inwardly and divides
75 the free space between the member 6 and bottom 5 into
an upper opening chamber 12 and a lower closure cham
3,085,743
ber 11. The inner end of the ?ange 10 terminates as a
guide surface 9, which slides in contact with the hub of
the centrifugal drum.
The lower closure chamber 11 is formed as an out
6
within the closure chamber without subsequent additions,
etc. The opening and closing are completely actuated by
passing the control liquid into the opening chamber and
by allowing the same to ?ow out therefrom.
More speci?cally, closure chamber 11 is provided with
a widened annular space 30, which receives a substantial
maintaining at least a given quantity of deformable or
portion of the deformable or ?owable mass which is dis
?owable material such as liquid, plastic or elastic mate
placed from the peripheral portion of chamber 11 upon
rial therein at any position of movement of the sleeve
movement of sleeve valve 21 to opened position as shown
valve 21 and the ?ange 10.
in FIG. 2. A shift in the level of said mass from that
10
A control liquid such as water may be introduced into
indicated at 15 in H6. 1 to that indicated at 15:: in FIG.
the upper opening chamber 12 through the conduits 16
2 therefore takes place. Because of the location of pro
and 17. Liquid may be removed from this chamber by
jection tube 18 in the bottom surface of bowl casing S
centrifugal action through the outlet conduit 13 in the
of FIG. 1, or channel tube 180 in sleeve valve 21 com
sleeve valve 21 and the port 14.
In operation, the centrifugal bowl is rotated with the 15 municating with port 14 of P16. 2, with respect to the
desired level of deformable or ?owable mass disposed
spindle 28 in the conventional manner. The material
in closure chamber 11, said mass will not pass out of said
to be treated is introduced through the inlet pipe 19 and
chamber under centrifugal action except to the limit de—
passes through the distributor 4 and conduit 23 into the
?ned by tube 18 or 18a.
interior of the bowl which contains the conventional disc
Due to the considerably decreased working surface area
inserts 24. The lighter liquid passes inwardly over the 20
in the peripheral portion of closure chamber 11 and the
disc insert and is discharged over the over?ow lip 25.
comparatively insigni?cant increased working surface
The heavier liquid is forced by the centrifugal force out
area in the annular extension space 30, upon initial move
wardly and passes upward and is discharged over the
ment of the sleeve valve 21 toward opened position when
over?ow lip 26. Solid materials or the like, designated
liquid is passed to opening chamber 12, the sleeve valve
as sludge, accumulate at the peripheral portion 7 of the
21 will quickly move to fully opened position as shown
bowl interior.
in FIG. 2. Conversely, due to the considerably increased
Before the separator is placed in operation, a closure
working surface area in the peripheral portion of closure
liquid having a high boiling point or a plastic or elastic
chamber 11 and the comparatively insigni?cant decreased
material is introduced into the closure chamber 11 in
working surface area in the annular extension space 30,
30
amount at least su?icient to fill the chamber to the level
upon initial movement of the sleeve valve 21 toward
15 indicated in FIG. 1 of the drawing during the centri
closed position when liquid is no longer passed to open
fuging with the sleeve valve 21 in the closed position.
ing
chamber 12, the sleeve valve 21 will quickly move
The deformable material is forced outwardly by the
to fully closed position as shown in FIG. 1.
centrifugal action and forces the ?ange 10 and the sleeve
In operation, during rotation the level of the ?owablc
35
valve 21 upward in the closed position.
material is shown radially outwardly at level 15, the
in order to open the sludge discharge openings, water
?owable material occupying the peripheral portion of
or similar control liquid is introduced through the pipe
the closing chamber 11 when no control liquid is passed
16 and conduit 17 into the opening chamber 12. The
through conduits 16 and 17 to the opening chamber 12.
amount of water introduced should exceed the amount
which is forced out by the centrifugal action through the 40 The level of the ?owable material is determined radiully~
inwardly by the presence of tube 18:: which allows excess
opening 13 and port 14. A centrifugal head of water
?owable material to pass off from closing chamber 11
thus builds up in the opening chamber 12. When this
through tube 18a and port 14. It will be speci?cally noted
head builds up so that a pressure is formed which exceeds
that the peripheral bottom surface of ?ange 10 and the
the pressure in the closure chamber 11, the ?ange 10 and
adjacent peripheral surface of the bottom 5 of the casing
45
sleeve valve 21 are forced downwardly to the position
together de?ne an area of ?ow-able material working sur
indicated in FIG. 2 of the drawing. The centrifugal
face radially inwardly to the level 15. As may be seen
pressure within the bowl can then force the sludge out
from
FIG. 2, when control liquid passes through conduits
through the annular space between the upper edge of the
16
and
17 to opening chamber 12, centrifugal action of
valve 21 and the gasket 22 and through the discharge
the control liquid dammed up within opening chamber 12
openings 20. When sludge discharge has been completed,
due to the comparatively small ?ow cross-section of out
the water passing through 16 is shut oil and the water
let conduit 13 will downwardly urge the ?ange 18 so as
passes out of the chamber 12 through the opening 13 and
to
open the ports 2!] for discharge of collected sludge in
port 14. The pressure caused by the centrifugal force
wardly con?ned storage space which is dimensioned for
the conventional manner. The level of the ?owable ma
acting on the deformable or ?owable mass in the cham
ber 11 then forces the ?ange 10 and sleeve valve 21 up 55 crial within the closing chamber 11 will therefore be
radially inwardly displaced from the level 15 to the level
wardly into the closed position and maintains the same
15a. This is due to the fact that the volume of the clos
in that position until water is again introduced into the
ing chamber 11 is decreased. At this time the peripheral
opening chamber 12.
bottom surface of ?ange 10 will engage the adjacent pe
Any excess of the deformable closure material which
ripheral
surface of the bottom 5 whereby the area of ?ow~
60
has been introduced into the closure chamber 11, as, for
able
material
working surface will be decreased by an
example, upon assembly thereof may discharge through
extent equal to the area of abutment between said periph
the opening 18 or 180 upon the ?rst opening actuation of
eral bottom surface of ?ange 10 and adjacent peripheral
sleeve valve 21. When the closure chamber 12 is ?lled
surface of bottom 5. However, due to the increased axial
with water, it is difficult to prevent small amounts of
Water from leaking out along the guide surface 9. In 65 dimensions of the annular extension space 30 with respect
to the peripheral portion of closing chamber 11, the por
order to seal the closure chamber 11 from this leakage,
tion of Working surface increased by the radially inward
a small ring chamber 29 is provided below the guide sur
displacement of the ?owable material from the level 15
face 9. Any water leaking through the guide surface will
to the level 150 will only insigni?cantly compensate for
therefore accumulate in this ring chamber. A drain con
duit 27 is provided from the ring chamber through which 70 the loss of working surface due to the peripheral abutting
engagement of the bottom surface of ?ange 10 and the
the water may pass out.
As the closure chamber 11 is formed as a storage space,
corresponding surface of bottom 5 of the casing. Thus,
the movement of ?ange 10 from closing position to opening
and is closed off to prevent entrance of control liquid
position will decrease the volume of closing chamber 11,
from the opening chamber, the deformable mass may re
main as a substantially permanent part of the apparatus 75 at the same time decreasing the effective ?owable ma
8,085,743
7
terial working surface area within closing chamber l1.
Accordingly, since a decreased Working surface area is
8
the improvement which comprises an insert member de
?ning an end surface of‘ the bowl interior and positioned
involved, the flange 10 will immediately respond to con
to de?ne a free space between it and the adjacent wall
trol liquid passed to opening chamber 12 and rapidly and
portion of the bowl, a ?ange connected to said sleeve
abruptly open the discharge ports 20 for the effective dis CI valve for movement therewith extending inwardly within
charge of sludge from the drum. On the other hand,
said free space dividing the same into an upper opening
upon cessation of the feeding of control liquid to opening
chamber 12, as the ?ange 10 moves upwardly, an effec
chamber and a lower closure chamber, said closure cham
i361‘ de?ning by means of said ?ange and the bowl an out
tive increase in ?owable material worll'ing surface area
wardly con?ned adjustable volume storage space dimen
becomes available due to the parting of the abutting por 10 sioned thereby for the maintaining of a predetermined
tions of ?ange 10 and bottom 5 of the casing, whereby
quantity of ?owable material therein undzr centrifugal
rapid and abrupt upward movement of the ?ange will
action and at standstill in any position of movement of
occur so as to close ports 20 in the desired manner.
said sleeve valve and in turn said ?ange, said ?ange sub
Since the force of the ?owable material is greater in the
stantially completely sealing said closure chamber from
peripheral portion than in the annular space 30, the
?ow communication with said opening chamber, an elas
abrupt movement of the ?ange 10 will occur with even
tic ?owable material positioned in said closure chamber
greater effectiveness.
and means for introducing liquid into said opening cham
While the speci?cation and accompanying drawings
ber during centrifugal operation to move said sleeve valve
have been set forth for the purpose of illustration, it
to opening position and means for the removal of liquid
will be understood that various changes and modi?ca
from said opening chamber, said adjustable volume stor
tions may be made without departing from the spirit and
age space having, when said sleeve valve is in closing
scope of the invention which is to be limited only by
position, a radially wide and axially narrow dimensioned
the scope of the appended claims.
peripheral zone completely occupied by said ?owable
We claim:
material during centrifugal operation and a radially nar
1. In a centrifugal separator having a centrifugal bowl
row and axially wide dimensioned annular zone inwardly
with peripheral sludge discharge openings and an axial
disposed with respect to said peripheral zone only partially
ly movable sleeve valve, movable between a position
occupied by said ?owable material during centrifugal
opening and a position closing said sludge discharge
openings, the improvement which comprises an insert
member defining an end surface of the bowl interior and
positioned to define a free space between it and the ad
jacent wall portion of the how], a ?ange connected to
said sleeve valve for movement therewith extending in
wardly within said free space dividing the same into an
opening chamber and a closure chamber, means for in
troducing liquid into said opening chamber during cen
operation, whereas when said sleeve valve moves to open
ing position, both the radially wide and axially narrow
dimensions of said peripheral zone substantially decrease
and the ?out/able material therein in forced therefrom into
aid annular zone while the axially wide dimension of
said annular zone only slightly decreases and the radially
narrow dimension of said annular zone remains substan
tially constant.
6. In a centrifugal separator having a centrifugal bowl
with peripheral sludge discharge openings and an axially
trifugal operation to move said sleeve valve to opening
position and means for the removal of liquid from said
movable sleeve valve, movable between a position open
opening chamber, said closure chamber containing ?ow
ing and a position closing said sludge discharge openings,
able material therewithin and having means for sealing 40 the improvement which comprises an insert member de
said closure chamber against the ?ow and over?ow of said
fining an end surface of the bowl interior and positioned
material therefrom into said opening chamber and for seal
to define a free space between it and the adjacent wall
ing said closure chamber against the complete outward
portion of the bowl, a ?ange connected to said sleeve
?ow of said material therefrom both at standstill and
valve for movement therewith extending inwardly with
under centrifugal action whereby a given mass of a ?ow
in said free space dividing the same into an opening
able closure material will be maintained therein both at
chamber and a closure chamber, said closure chamber
standstill and during operation and in any position of
de?ning by means of said ?ange and the bowl an out
movement of said sleeve valve for closing actuation of
wardly con?ned storage space adjustable in volume in
said sleeve valve, said closure chamber de?ning between
dependence upon the movement of said ?ange, contain
the ?ange and the adjacent wall portion of the bowl an
ing a ?owable material therewithin and being peripherally
outwardly con?ned storage space having, when said sleeve
valve is in closing position, a radially wide and axially
and annularly dimensioned thereby for permanently main
and a radially narrow and axially wide dimensioned an~
nular zone inwardly with respect to said peripheral zone
taining at least a predetermined amount of said flow
able material therein under centrifugal action and at stand
still in any position of movement of said sleeve valve
and in turn said ?ange, said ?ange substantially com
pletely sealing said closure chamber from ?ow com
only partially occupied by said ?owable material during
munication with said opening chamber and de?ning with
centrifugal operation, whereas when said sleeve valve
moves to opening position, both the radially wide and
annular peripheral portion having a substantially de
narrow dimensioned peripheral zone completely occupied
by said ?owable material during centrifugal operation
the bowl interior a closure chamber radially outward
axially narrow dimensions of said peripheral zone sub~ 60 creased ?owable material working surface area in open
stantially decrease and the ?ow-able material therein is
ing position of movement of said ?ange with said sleeve
valve and a substantially increased ?owable material
ly wide dimension of said annular zone only slightly de
working surface area in closing position of movement
creases and the radially narrow dimension of said an
of said flange, said ?ange further de?ning with said bowl
65 interior a closure chamber radially inward annular axial
nular zone remains substantially constant.
2. Improvement according to claim 1 wherein said
portion having a slightly increased ?owable material
?owable material is a plastic material.
working surface area in opening position of movement
3. Improvement according to claim 1 wherein said
of said ?ange with said sleeve valve and a slightly de
?owable material is an elastic material.
creased ?owable material working surface area in clos
4. Improvement according to claim 3 wherein said 70 ing position of movement of said ?ange, and means for
elastic material is rubber.
introducing liquid into and for the removal of liquid from
5. In a centrifugal separator having a centrifugal bowl
said open chamber, whereby upon actuation of said sleeve
forced therefrom into said annular Zone while the axial
with peripheral sludge discharge openings and an axially
valve to opened position by introducing liquid into said
opening chamber, the working surface area of said ?ow
ing and a position closing said sludge discharge openings, 75 able material against said ?ange at the peripheral portion
movable sleeve valve, movable between a position open
3,085,743
10
of said closure chamber will substantially decrease and
the working surface area of said ?owable material against
said ?ange at the annular portion of said closure cham
ber will only slightly increase, while upon actuation of
said sleeve valve to closed position by the removal of
liquid from said opening chamber, the working surface
area of said material against said ?ange at said peripheral
portion will substantially increase and the working sur
maintained therein in any said position of movement of
said sleeve valve.
9. Improvement according to claim 6 wherein an open
ing communicating with the exterior of said separator
is provided in the upwardly limiting ?ange wall of the
closure chamber a predetermined radial distance from
the periphery of said closure chamber and axially above
a predetermined level of said ?owable material in said
closure chamber when said separator is at standstill,
face area of said material against said flange at said an
nular portion will only slightly decrease, enabling said 10 whereby complete outward flow of said ?owable closure
material will be prevented and a given mass of said
sleeve valve to move rapidly to both the opened and
material will be maintained therein in any said position
closed positions without increasing and decreasing the
of movement of said sleeve valve.
amount of ?owable material within said closed chamber
‘10. Improvement according to claim 6 wherein a tubu
upon such actuation.
7. Improvement according to claim 1 wherein an open 15 lar extension communicating with the exterior of said
separator projects a predetermined distance into said
ing communicating with the exterior of said separator
closure chamber a predetermined distance from the pe
is provided in the upwardly limiting wall of the closure
riphery of said closure chamber and axially above a pre
chamber a predetermined radial distance from the periph
determined level of said ?owable material in said closure
ery of said closure chamber and axially above a prede
termined level of said ?owable material in said closure 20 chamber when said separator is at standstill, whereby
complete outward ?ow 0t said ?owable closure material
chamber when said separator is at standstill, whereby
will be prevented and a given mass of said material will
complete outward ?ow of said ?owable closure material
be maintained therein in any said position of movement
will be prevented and a given mass of said material will
of said sleeve valve.
be maintained therein in any said position of movement
25
of said sleeve valve.
References Cited in the tile of this patent
8. Improvement according to claim 1 wherein a tubular
UNITED STATES PATENTS
extension communicating with the exterior of said sepa
rator projects a predetermined distance into said closure
878,591
Sonnenfeld et al. ______ __ Apr. 18, 1905
chamber a predetermined distance from the periphery of
957,347
Kennedy ____________ __ May 10, 1910
said closure chamber and axially above a predetermined 30 2,103,822
Perry _______________ __ Dec. 28, 1937
level of said ?owable material in said closure chamber
FOREIGN PATENTS
when said separator is at standstill, whereby complete
122,937
Sweden ______________ __ Oct. 5, 1948
outward ?ow of said ?owable closure material will be
616,442
Great Britain _________ __ Jan. 21, 1949
prevented and a given mass of said material will be
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