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Патент USA US2107035

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Feb. 1, 193.8.
s. H.-HAL|_
- Filed Jam-2s, 1955
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Patented Feb. l, 1938l
_ 21,107,035
cross» cEN'raxFUGAL Seminaren
semen n. nan, Poughkeepsie, N. Y., assignm- to
The Dc Laval Separator Company, New York,
N. Y., a' corporation of New Jersey
` Application January 23, -1935, Serial No. 3,089
In Sweden February 16, 1934
2 (llaims.`
(ci. 233-28)
Hermetically closed separators, especially such -larly to Fig. 2: _l is. the centrifugal separator
as are used in dairies, are often coupled in
having a hollow spindle or tube 5 forming an
series with other apparatus, for instance pas
teurizers and the like, in which the separated
-components of the liquid are further treated.
The liquid must often be passed under rather'
high pressure through these latter apparatus.
outlet communicating with the central part of
The special tightening devices which must be
arranged in hermetic separators cannot,~ how
the separating space of the bowl and (surround
ing pipe 5) an outlet tube or neck 4 forming an
annular passage- ¿i communicating with the pe
ripheral part of the separating space of the bowl.
Fixed pipes 2 and 3 communicate respectively
with tubes 5 and 4 and are made tight'by ilexi- '
ever, as a rule stand up to more than a given
pressure.- In case one or more apparatus are to
ble packings 8. >Secured to the tubes 5 and 4i,
which lrotate with the bowl, is a centrifugal pump
be coupled -in series it is therefore necessary to
interpose pumps between the separator and the
said apparatus in order to reduce the load on
through which the heavy liquid discharged
the stufiing box at the inlet of the separator.
According to the present invention centrifugal
pump wheels or pump impellers, carried by the
`bowl spindle or otherwise arranged to rotate
with the bowl, are located directly on the inlet
and/or the outlet of the separator, In this way
several considerable advantages are attained.
The packing at the inlet canl be wholly or partly
freed of any load, and pump wheels of the type
wheel 6, which is preferably made removable,
through tube d must pass on its way to the fixed Í
outlet pipe '3.
The ldescribed construction is
designed for use where apparatus, -such as a
pasteurizer. connects only with the pipe 3;l but
if a similar apparatus connects, also or instead,
with pipe 2, it may be desirable, in exceptional
cases, to plac'e a similar centrifugal pump wheel .
Ell, also or instead, at the upper end of tube 5.
The centrifugal pump wheel in either position
hasthe great advantage that it supplies force to
referred to are more advantageous ¿in several re y overcome the back pressure on the >outlet Without
spects than common pumps. The dimensions of requiring excessive pressure on the packing I8
the wheels. can be small owing to the generally shown in Figs. 3 and 4 at the inlet.
If the throughput of the separator is very
high number. of revolutions, which means higher
eiïect and'more convenient cleaning. Besides, a high, an increased pressure on the separated
liquid is necessary at the inlet. .At and over' a.
» considerable simplification of the whole instal
lation is possible, as both the motor and the driv .given throughput I therefore provide a centrifu
ing arrangements may be combined with the -gal pump wheel at the inlet, as shown in Fig. 3.
'I'he accompanying drawing illustrates several
embodiments of the invention.L
Fig. 1 is an external view of a centrifugal sepa
rator having the inlet located at the lower part
. of the separator vandthe outlets vat the upper
The pump wheel I0 is here ñxed to the bored
spindle 1 and is surrounded by a ñxed casing
member 8a, enclosing a passage communicating
`with a pipe Il. through which the liquid to be ,
separated ñows to the pump wheel, and a ñxed '
casing member 9b which, with vthe AcasingA mem- ‘
ber 9a, encloses a chamber I6 through which the
/ ` Fig. 2 is a vertical sectional view of the upper ' liquid to be separated flows from the pump wheel
part o_f -the separator of Fig. 1, >showing the
two outlets and centrifugal , pump impellers,
functioning as pressure generators, arranged to
rotate with thé separator and positioned at the
Fig. 3 is a vertical sectional view of the lower
to the bored spindle 'I through which the liquid
ñows into the bowl. Between the ring Il and
the casing member 9a is confined one end of a
packing i8 which bears againsty the spindle 1 and
prevents, leakage to or from ‘the suction side of
the pump. The whole arrangement is kept to
part of a separator provided with an inlet at ' gether. by means of a.hand-turnable screw I2
-th'e bottom and a centrifugal pump, functioning
as' a pressure generator; arranged to rotate with
turnable in a' threaded part i3 of the fixed frame
I1, so that no additional sealing devices- are `
the driving spindle and positioned at the inlet.
necessary- other than the narrow clearances gen
Fig. 4 is a detail view in vertical section of the l erally used in centrifugal.A pumps. -By the del
preferred construction of the lower (inlet) end
scribed arrangement it is possible to construct
of the separator of Figure 1 when the pressure
generator is applied at one or both of the outlets
throughputs. .
'and not at the inlet.
„ Referring to Figs. 1 and 2 and more particu#
hermetically closed separators even for very high _
A _
Within chamber I8 are placed one or more
wings Il, which may extend radially, and which
, 2
act to reduct the rotative speed oi’ the liquid dur
ing its ilow from the pump wheel toward the
hollow spindle.
In the arrangement shown in Fig. 3 the suction
side of the pump is `turned from the inlet of the
spindle, thereby imposing a minimum load on the
sealing device I8.
For the centrifugal pump wheel shown may be
substituted- any other known equivalent device
10 which, when applied to a rapidly rotating mem
pumped from the i‘lr'st mentioned chamber to the
second mentioned chamber, and guiding wings
positioned in the second mentionedchamber and
adapted to reduce the rotative speed of the liquid
during its ilow from the pump impeller to the
l hollow spindle.
2. A centrifugal separating apparatus compris
ing a ñxed inlet pipe, ilxed outlet pipes, a rotat
able centrifugal separator having outlets in closed
communication with the iixed outlet pipes respec
ber, will generate pressure in a liquid flow passage, Y tively, a hollow spindle rotating with the sepa~
but the centrifugal pump wheel has certain 'ad
-vantagesover other types of pressure generators.
What I claim and desire to protect by Letters .
Patent is:
1. A centrifugal separating apparatus compris
ing a iixed inlet pipe, fixed outlet pipes, a rotat
able centrifugal separator having outlets in closed
communication with the iixed outlet pipes re
spectively, a hollow spindle rotating with the sep
arator and through which liquid to be separated
is adaptedv to _flow to the separator, casing mem
bers providing stationary chambers communi
eating withthe ?xed inlet pipe and with the inlet
end of said rotatable hollow spindle, respectively,
a centrifugal pump impeller mounted on said
spindle and through which inñowing liquid is
rator and through which liquid to be separated
is adapted to ñow to the separator, casing mem
bers providing a stationary chamber communi
eating with the fixed inlet pipe and through which
lsaid spindle passes and a second stationary cham
ber below said first chamber and communicating
with the inlet end of said rotatable hollow spin
dle, ilexible means to seal the joint between said
spindle and the wall of said ilrst chamber, and a 20
centrifugal pump impeller mounted on said spin
dle and through which inflowing liquid is pumped
from said ñrst chamber to said second chamber
whereby the sealing means is subjected only to the
low pressure obtaining on the suction side of said
centrifugal pump impeller.
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