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Патент USA US2136062

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H. sUss
Nov. 8, 1938.
2,136,062
APPARATUS FOR EXTRACTING PARAFFIN FROM MINERAL OILS
Filed Feb. 26, 1938v
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Nov. 8, 1938.
H, SUSS
2,136,062
APPARATUS FOR EXTRACTING PARAFFIN FROM MINERAL OILS
Filed Feb. v26, 1958
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ATTORNEYS
Nov. 8, 1938.
' 2,136,062
H. SUSS
APPARATUS FOR EXTRACTING PARAFFIN FROM MINERAL OI'LS
Filed Feb. 26, 193 G
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ATTORNEYS
Patenteéd Nov. 8, 1938
2,136,062
‘UNITED , STATES PATENT OFFICE’
' 2,136,062
APPARATUS FOR‘ EXTRACTING PARAFFIN
'
FROM MINERAL OILS
Heinrich Siiss, Berlin-Tegel, Germany, assignor
to Rheinmctall-Borsig Aktlengesellschal't Werk
Borsig Berlln-Tegel, Berlin-Tegel, Germany, a-v
corporation of Germany
Application February 26, 1938, Serial No. 192,705
In Germany April 19, 1937
7 9 Claims.
(01. 62-114)
This invention relates to means for cooling lation of the cooling medium, even though an
liquids, and refers more particularly to an appa~ easily evaporating medium is used, which is sup
ratus for extracting para?ln from mineral oils. plied in excessive quantities. In order to increase
In prior art, the extraction of-para?in from ~ the cooling, the oil from which paraf?n has been
5 mineral oils is often carried out by circulating
extracted may be'conducted in countercurrent ~
the oil through a horizontally. disposed cooling , to the cooling medium ?owing along the inner
wall of the cylinder, the 011 being introduced at
ammonia, ?owing along the outer surfaces of the lower end of the container enclosing the
this pipe. Para?in is crystallized by this cooling cooling'cylinder and being removed from the
pipe or chiller, a cooling medium, such as liquid
10 ‘and deposited upon the inner surfaces of the
upper end of the container.
.
pipe. Then the para?ln is scraped off the walls ’ It may be advantageousto provide an addi
'of the pipe by special scraping devices, which
10
ting scrapers in the chiller. The manufacture
tional container below the container for the oil,
this second container being'used for receiving
the liquid cooling medium and for replenishing
it. The container for the cooling medium is pro 15
vided with vertical channels, preferably extend
ing through the axis of rotation of the cooling
cylinder, for conductingv the cooling medium to
the upper end of the cooling cylinder.
expensive task, since the inner diameters of
the following detailed description when taken in
may have theform of spiral bodies, and is car
ried through the chiller by the oil, which is later
sent through-a ?lter wherein para?ln crystals
are separated from the oil.
The disadvantage of this'construction is that
it requires the use of expensive and exactly fit
20 of the chillers is a comparatively di?lcult and
, ordinary pipes may vary to ‘a great extent; for
example, a pipe of an average diameter of 150
mm. may have variations in diameter amount
ing to as much as 3 mm.
Therefore, in order
to provide a perfect flt for the scraping devices,
it is ‘necessary to use bored-out pipes, thus in
creasing the ,manufacturing costs to a consider
able extent. If, in order to avoid such high ex
30 pense, pipes of the usual type areused, para?in
is permanently deposited upon the walls of the -
pipes, thereby loweringgreatly the amount of
the transmitted heat.
»
,
.
An object of the present invention is to elimi
nate these drawbacks by providing a device for
extracting para?ln which is comparatively in
expensive to manufacture and which operates‘
The invention will appear more clearly from 20
connection with
the
accompanying . drawings, '
showing by way of example preferred embodi
ments of the inventive idea.
, _
vIn the drawings:
25
Figure 1 is a‘vertical section throughv a cooler
constructedv in accordance with the principles
> of the
present invention;
-
-
2-2- of Figure 1; .
30
Figure 3 is a horizontal section along the line
3—3 of Figure 1;
.
a
v
Other objects of the present invention will be
cation.
.
The objects of the present invention maybe
realized by causing the cooling medium to flow
downwardly in the form of a thin layer along
“ the inner wall of a rotating vertical cooling‘cyle
inder which is surrounded by oil. It is advan
tageous to combine several vertical cooling cyl
,,
Figures 4 and 5 show in horizontal cross;
section coolers designed for a greater output;
‘Figure 6 shows another cooling device in ver
tical
section;
-
'
Y
'
>
Figure 7 is a horizontal section along the line
' with an excellent coe?lcient of heat transmission. _ ‘l—'! of Figure 6; and
40 apparent in the» course of the following speci?—
'
Figure 2 is a horizontal section along the line
,
Figure 8 is a horizontal section along the line
8-8 of Figure 6.
.
40
The cooling device shown in Figures 1, 2, and
3 of the drawings comprises a cylindrical con
tainer [0 which contains. three rotary cooling
cylinders 20. A motor I3 is situated upon a sup
port I 4,~ which is carried by the cover’ I 2 of the 45
container
l0.
-
'
_
The shaft l5 of the motor I3 is ?nnly con
inders .into one group which is provided with nected with a vertical shaft Hi to which an elon
one scraping device, such as a scraping roller. ‘ gatedv scraping roller or brush I 'l is connected.
Para?ln contained in the oil is then deposited As shown in Figure 1, the vertical cylindrical -'
upon the outer surface of the cooling cylinder and brush or scraper l1 extends substantially from
is easily removed therefrom, so that it cannot the top to the bottom of the container 10.
form a permanent layer of crystals which would
A portion of the shaft I6 is square in cross
diminish the coe?lcient of heat transmission.
' section and carries a pinion l8, which is rotat~
It is ‘advisable to provide a continuous circu
able along with the shaft. The pinion I8 is in
2,186,062
2
engagement with three toothed wheels l9, which
are ?rmly mounted upon the cooling cylinders
20, so that the three cylinders are rotatedby
3 However, the oil may also be conducted to the.
outer walls of the scraping roller l1 and applied
by this roller to the outer surfaces of the cylinders
v2|! in the form of a thin layer.
When the motor I3 is switched on, its rotation
2| through which the cooling medium is intro- ‘ will be transmitted through the shaft l5 and the
shaft l6 to the pinion l8 and the gear wheels l9
duced. An annular chamber 22 is provided with
in the cover l2 and is in communication with the , meshing therewith, so that the cylinders 20 will
be rotated along with the scraping roller I1.‘
pipe 2|. The chamber 22 is also in communica
Therefore, the oil which is applied to the outer
10 tion with an opening 25 of a feed pipe 24, whichv
surfaces
of the rotating cylinders 20 will ?ow
is suspendedfrom the cover l2 and which extends
through the chamber 22. As shown in Figure 1, down these surfaces in the form of helical wind
the pinion l8.
The cover l2 of the container I0 carries a pipe
the pipe 24 projects into one of the cylinders 20
and extends through its gear wheel_|9.
Two other pipes, similar to pipe 24, which are
15
not shown in the drawings, extend into the in
teriors of the other two cylinders 20. Since the
devices pertaining to each of the three cylinders
20 are the same in construction and, operation,
20 only one of them will be'described in this speci
?cation.
'
-
ings.
The cooling medium, which may be liquid am
monia, brine, or the like, is introduced through 15
the pipe 2| into the chamber 22 situated within
the cover l2. Then the cooling medium-?ows
into the interior of the pipes 24 through their
openings 25 and is thus introduced into the cyl
inders 20; it falls upon the plates 42 and is pro 20
jected against the inner walls of the cooling cyl
inders 20 by the centrifugal forces developed in
Another annular chamber ZB'is situated above
the chamber 22 and is used for collecting the ' the course of the rotationof the plates 42. The
vapors of the cooling medium. A second pipe 21 cooling medium subjected to the centrifugal and 25
gravitational forces ?ows downwardly along the
25 is suspended from the cover |2 adjacent‘ the pipe
inner
walls of the cylinders 20 and will absorb an
23. The pipe 21 also extends through a gear
,wheel l9 and into the interior of a cylinder 20, amount of heat su?lcient for at least a partial
evaporation of the cooling medium, said ‘heat
and is provided with an opening 28 communicat
coming
from the‘ oil surrounding the cooling
ing with the chamber 26. The chamber 26 is also
30
cylinders
20.
30 in communication with a pipe 29 carried by the
Due
to
this
cooling
of
the
oil,
para?in
is
crys
‘cover- l2 and used for the removal of the gaseous
tallized and deposited upon the‘ outer walls of the
cooling medium.
cooling cylinders 20 and is immediately scraped
' Another inner chamber 30 is provided within
off
by the scraping roller H, which rotates with
the cover I2 and is enclosed by the walls 3|. A
35
35 plate or cover 32, which carries the support |4 a speed di?’erent from that of the cylinders 20.
for the motor l3, constitutes a cover for the
The scraped-oil’ crystallized parafiin particles re
chamber 3|! and carries a pipe 33 through which main in suspension in the oil and are carried by
crude oil may be introduced into the chamber .30. it, the oil carrying the paraffin particles ?owing
The bottom plate 34 of this chamber is provided ‘ through the trough 39 to a filtering device, not 40
shown in the drawings, where para?in is sepa
40 with several openings 35 through which the oil
may flow into the interior of the container l0 and rated from the oil.
upon the rotating cylinders 20.
The bottom plate ll of the container I0 is hol-v
The vaporized ammonia rises through the pipe
21 into the chamber 26 and is ‘removed through
the pipe 29.
'_
low and comprises an annular chamber 49 hav
The remaining liquid ammonia is collected at 45
45 ing inner walls 48. 'A plate 36 constitutes the the bottom of the rotary cylinders 20 and‘?ows
cover for the chamber 49 and carries a vertical
pipe 31 by means of which the cooling medium . through the pipe 31 into the chamber 49 of the
can be introduced into the chamber 49. A pipe bottom plate ||, being removed from the device
_'
‘
'
38 carried by the plate H is used for the removal through the pipe 38.
The time required for the flow of the cooling 50
of
the
cooling
medium.
,
50
Conical walls 39 are disposed in the middle of medium can be easily regulated by the proper
the bottom plate II and form a trough used for ,selection of the-speed of rotation of the cooling
the removal of the scraped-off paraffin and the cylinders 20. The oil can‘ be caused to ?ow along
the outer walls of the cylinders 20, ‘or, as is as
oil carrying the same.
'
,sumed'
in the construction shown in Figure 1, 55
The
‘cooling
medium
circulating
through
the
65
the
container
I0 may be ?lled with oil. In the
cylinders 20 is prevented from mixing with the
oil by means of a packing 40 enclosing the pipes latter case, the rotation of the cooling cylinders
24 and 21 and a packing 4| enclosing the pipe 31. furthers the exchange of heat, due to a differ
In the device shown in Figure 1, these packings ence in speed between the rotating walls of the 60
20, the oil movable therewith and the
have the form of concentric cylinders which are cylinders
partly ?lled with mercury, although, obviously,. remaining oil, which ?lls the container l0. .
' The constructions shown in Figures 4 and 5
stu?ing boxes or other suitable devices may be of the drawings are used for plants of compara- _
used for the same purpose.
tively large dimensions. Figure 4 shows a central
Each of the cylinders 20 carries a plate 42 which - cylinder 50 which is surrounded by three scraping 65
encloses the pipe 21 and is suspended from the ‘ rollers 5| and ?ve outer rotary cylinders 52,
top ‘of the cylinder by the supports 43, so that it
rotates along with the cylinder.
"
The operation of the device is as follows:
Crude oil is introduced through the pipe 33 into
70 the chamber 30 and penetrates through the open
ings 35 formed in the bottom of that chamber into
the interior of the container l0. Theoil drops
75
which are all enclosed in a container 53.
i
' In the construction shown in Figure 5, there is
an inner'ring of six rotary cylinders 80 which is
enclosed by six scraping rollers 6| surrounded by 70
twelve‘ outer cylinders 62, the entire aggregate
being situated within a'container 63.
In each of these devices, the rotary cylinders
upon the gear wheels I9 of the three containers
are arranged in groups of three, each group being
20 and ?ows along the outer surfaces of these ,
‘ in contact with one scraping roller, all of the
containers,
-
2,186,062
cylinders being driven from the middle of the
container. By these means it is possible to pro.
vide large cooling surfaces within a comparatively
small area.
Cl
The device shown in Figures _6 to 8 of the
drawings comprises a cylindrical container 18
which encloses three rotary cylinders H. The
outer surfaces‘ of these three cylinders are en
gaged by a scraping roller or brush 12 which is
10 situated in the middle of the container 18 and
which is rotatable along with its shaft 13 driven
3
terior of the container 18 through the pipe 99 and
gradually ?lls the container.
The cooling medium, for instance ammonia,
is introduced into the chamber 82 of the container
88 through the pipe 84 having a valve 85, which
regulates the amount of the cooling medium .in
circulation. The evaporated cooling medium
leaves the chamber 82 through the pipe '81, is
liqui?ed by a compressor, not shown in the draw
ings, and is then returned to the chamber 82
through the pipe 84.
_
by a motor 14 which is preferably situated above
the container 18. The cover 15 of the container
18 carries the support 16 for the motor 14. A
When the pump 96 is switched on, it will pump
the liquid ammonia contained in the chamber 82
is firmly connected with a separate rotary cylin
der H. The container 18 carries a bottom plate
19 which is ?rmly connected therewith and which
89, causing it to rise within these pipes until it
reaches the upper ends thereof. Liquid ammonia
?owing out of the upper ends of the pipes 89 will‘
drop upon the plates I8I which are rotatable along
with the containers 1|. Due to the centrifugal 20
15 pinion 11 is ?rmly mounted upon shaft 13 and ., through the pipes 93, 94 and 91 into the lower
chamber 83 of thecontainer 88 and into the pipes 15
meshes 'withthree gear wheels 18, each of which
20
supports the rotary cooling cylinders H.
A second container 88 is situatedbelow the con
forces, ammonia will be directed toward the inner
tainer 18 and is provided with an inner hori
zontal plate 8'I which divides the interior of the
container 88 into two chambers 82 and 83.
walls of the containers 1I and will flow by gravity
through the openings formed upon the periphery
of the discs IM and down the inner ‘surfaces of
the containers H in countercurrent to the flow of 25
the crude oil which rises within the container 18
and ?ows upward along the outer walls of the
cylinders H. A part of the. ammonia will be
evaporated and para?in will be deposited upon the
outer walls 01' the rotary cylinders 1I. Ammonia 30
remaining in the liquid state will ?ow down the
A
25 pipe 84, which is carried by the container 88 and
which is incommunication with the chamber 82.
is used for introducing the liquid cooling medium
- into the container 88 and may be closed by a valve
85 operated by a ?oat 88.-
30
‘
'
Another pipe 81 which is used for the removal
of the gaseous cooling medium is carried by the
container 88 and is situated close to the cover 88
of the container;
A long vertical pipe 89 is supported by the par
tition plate 8|; the lower end of this pipe is in
pipes 92 into the chamber 82 of the container 88. 1
crystallized para?in is removed‘ from the side
walls of the cylinders H by the scraping roller
12 and remains in suspension in the oil, which is
removed from the container 18 through the upper
branch pipe I88 and is poured into a ?ltering de
- communication with the chamber 83 formed in
the container 88. The pipe 89 extends through
one of the cylinders 1| and its upper end is situ
ated close to the gear wheel 18 carried by that
40 cylinder. The vpipe 89 passes through an opening
formed in the cover 88, said opening being closed
in an airtight manner by means of the stuffing
box 98, and through an opening which is formed
'45
} in the bottom plate 19 and which is closed by
’
vice.
Since the liquid cooling medium is subjected to
constant circulation, the device can be advan 40,
tageously used in connection with plants using
a cooling medium which does not evaporate in
the course of the cooling process. For example,
it is possible to treat the mineral oil in two stages,
the stu?lng box 9|. A plate or disc I M is situ ‘ the ?rst stage consisting of a preliminary cooling
45
ated at the upper end of the cooling cylinder 1|
by a ?ltrate having a comparatively low tempera
and is rotatable therewith. The upper end of the ture. In the second or next stage an‘ evaporating
pipe 89 extends through the disc IN and ter
cooling medium, for instance ammonia, may be
minates just above that disc.
used.
‘
'~
Similar
pipes
89
are
situated
within
the
other
50
Whenever a low temperature ?ltrate is used for
two cylinders 1I. Since the construction is the a preliminary cooling of the crude oil, the pump
same for all the vthree cylinders, only ‘one of them ' 98 is switched o?‘ and the container 88 is used as
will be hereinafter referred to in the speci?ca
a heat exchanger. The low temperature ?ltrate
tion.
'
'
Pipes 92 are situated between the containers 18
is then caused to ?ow downwardly along the inner
walls of the cooling cylinders instead of the evap-i‘
and 88 and enclose the long pipes 88. ~ The lower
crating cooling medium, while the oil may be
ends of the pipes 89 are in communication with
the chamber 83 of the container‘ 88 (Fig. 6). The
pipes
92 are also in communication with the cyl
60
inders H and are rotatable therewith.
caused to circulate in the same manner as in the
The two chambers 82 and 83 of the container I
88 are in communication with each other by
means of a pipe 93 which extends through the
65 chamber 83 and which connects the chamber 82
with a bent pipe 94 carrying a valve 95. The
other stages, namely, by being introduced into
the container 18 through the pipe 99 and by be
ing removedthrough the pipe I88.
The described devices are considerably cheaper
in the manufacture and installation than prior
art devices having the same output.
60
_
Furthermore, devices constructed in accordance
with the present invention may be advantageous 65
other end of the pipe 94 is connected to .a cen- I ly employed for carrying out other processes in
volving ‘an exchange of heat. They are particu
trifugal pump 98, the opposite side 01’ which is larly
advantageous for certainv methods requir
connected by a pipe 91 carrying a valve 98 with ing a very rapid heat exchange and the greatest
the
lower
chamber
83
of
the
container
88.
70
possible transmission of heat. The surfaces used
The container 18 is provided with a bottom for the exchange of heat are considerably smaller 70
branch pipe 99 and a top branch pipe I88.
than the surfaces of prior art constructions and
The device is operated as follows:
the time required for the treatment is consider
Crude oil or any other liquid which is to be ably shorter, so that a greater output may be at
cooled in the device is introduced into the in
tained.
_ '
is
4
_ 2,188,062
The cost of construction is low, particularly
since no special treatment and precision are re
4. A device for cooling liquids, comprising at
least one cooling cylinder having inner and outer
heat-transmitting surfaces, a pipe constituting
quired for the manufacture and installation of a channel for the introduction of a liquid cooling
the cooling cylinders and the scraping rollers. A
into saidcylinder, said pipe projecting
particular advantage of the described construc "medium
into the interior of said cylinder, means con
tions is that the continual cleaning of the sur- 1
I faces of the cooling cylinders is automatic and
nected with said cylinder for rotating the same,
thorough.‘ Furthermore, the driving means for
the scraping rollers and the cooling cylinders are
situated within a container through which oil
flows continuously, so that thorough lubrication
is assured.
a plate situated‘ within said cylinder and rotat
able therewith, said‘ plate being connected with
said cylinder and having peripheral openings
'
It is apparent that the specific illustrations
shown above have been given by way of illustra
tion and not by way of limitation, and that the
structures above described are subject to wide
formed therein to cause a. flow of the liquid cool
ing medium along and in contact with the inner
surfaces of the cylinder, another pipe constitut
ing a channel for the removal of a gaseous cool
ing medium from said cylinder, the second-men 15
tioned pipe projecting into the interior .of said
variations and modifications without departing
cylinder, and having an end portion situated be
from the scope of the invention. For example,
the described constructions can be used not only
for the extraction of parafiin from mineral oils,
but also for the cooling of other liquids which
cause the deposit of crust-like layers upon a cool
ing surface. It is immaterial for the purposes
of the present invention whether the ‘scraping
rollers and the cooling cylinders are intercon
nected by separate drives or are merely in fric
tional engagement with each other, or whether
the ‘cooling cylinders are used for driving the
scraping rollers or vice versa. All of such and
other variations and modi?cations are to be in
cluded within the scope of the present invention.
What is claimed is:
1. A device for. cooling liquids, comprising a
plurality of vertical cooling cylinders constitut
ing a single'group, each of said cylinders, having
‘inner and outer heat-transmitting surfaces, 2.
,single scraping device in, contact with the outer
surfaces of all of said cylinders, means rotating
said cylinders and said scraping device at dif
40 ferent speeds to cause said outer surfaces to move
relatively to said scraping device while in contact
therewith, means causing the ?ow of a cooling
medium along and in contact with said inner
surfaces, and means causing the liquid to be
cooled to contact said outer surfaces.
low said plate, and means causing the liquid to be
cooled to contact the outer surfaces of said cylin
der.
-
20
'
5._ A device for cooling liquids, comprising at
least one cooling cylinder having inner and outer .
heat-transmitting surfaces, means introducing a ‘
liquid cooling medium into said cooling cylinder
at one of the ends thereof and causing it to flow 25
along and in contact with said vinner surfaces,
means causing the liquid to be cooled to contact
the outer surfaces of said cylinder, a pipe situ
ated at the opposite end of said cylinder {or re
moving the liquid/ cooling medium, a mercury 30
?lle'd sealing container between said pipe and
said cylinder, and means constituting a chamber
for the liquid cooling medium and in communi
cation with said pipe.
j 6. A device for cooling liquids, comprising at
least one cooling cylinder having inner and outer
heat-transmitting surfaces, a container adapted
to contain the liquid to be cooled and enclosing
said cooling cylinder, whereby the liquid in said
container is in contact with said outer surface,
another container for the cooling medium, the
second-mentioned container being situated below
the ?rst-mentioned container, means connected
with the second-‘mentioned container and pro
jecting into the interior of said cooling cylinder
2. A device for cooling liquids, comprising at' for introducing said‘ cooling medium into said
least one cooling cylinder having inner and outer container at one of the ends thereof, and means
with the second-mentioned container
heat-transmitting surfaces, means causing the connected
and the opposite end of said cooling cylinder for
?ow of _a' cooling medium along and in contact the return ?ow of said cooling medium from said
with said inner surface, scraping means in con
cooling cylinder into the second-mentioned con-'
50 tact with said outer surface, ‘means connected
_
v
with said‘ cooling cylinder for moving‘ its outer tainer.
7. A device for cooling liquids, comprising a‘
surface relatively to said scraping means while plurality of vertical cooling cylinders, each of
it is in contact therewith, and a container adapted said cylinders having inner and outer heat-trans
to contain the liquid to be cooled and enclosing
55 said cooling cylinder, the second-mentioned mitting surfaces, a container adapted to contain
the liquid to be cooled and enclosing said cooling
means and the third-mentioned means, whereby , cylinders, whereby the liquid in said container is
the liquid in said container is in contact with said in contact with the outer surfaces of said cylin
outer surface.
"
3. A device forv cooling liquids, comprising at ders, another container for the cooling medium, 60
45.
least one vcooling cylinder having inner and outer
heat-transmitting surfaces, means constituting
a channel having an end portion projecting into
the interior of said cylinder for the introduction
of a liquid coolingv medium thereinto, means con
nected with said cylinder for rotating the same,
a plate situated within said cylinder below’ said
end portion and connected with said cylinder,
said plate having peripheral openings formed
therein and being rotatable along with said cyl
70 inder, whereby the liquid cooling medium is
caused to ?ow along and in ‘contact with the in
ner surfaces of ' the cylinder, and means causing
I the liquid to be cooled to contact the outer sur
~15
faces of said cylinder.
.
'
the second-mentioned container being situated
below the ?rst-mentionedcontainer, pipes com-.
municating with the second-mentioned container
and projecting into the interior of said cooling
cylinders,;said pipes having ends situated adja
cent the upper ends of-said cylinders, whereby
said cooling medium is introduced into said cylin
ders at the upper ends thereof and is caused to
flow downwardly through said cylinders, and
pipes connected with the upper portion of the
second-mentioned container and the lower ends
of said cylinder for the return flow of said cooling‘
medium from said cooling cylinders into the sec
ond-mentioned container.
8. A device for cooling liquids, comprising at 1
5
9,186,088 '
least one cooling cylinder having inner and outer
heat-transmitting surfaces, a container adapted
to contain the liquid to be cooled and enclosing
said cooling cylinder, whereby the liquid in said
container is in contact with said ‘outer surface.
another container for the cooling medium, the
9. A device for cooling liquids, comprising at
least one cooling cylinder having inner and outer
heat-transmitting surfaces, a container adapted
to contain the liquid to be cooled and enclosing
said cooling cylinder, whereby the liquid in said
container is in contact with said outer surface,
second-mentioned container being situated below \ another.‘ container for the cooling medium, the
second-mentioned container being situatedvbelow
the ?rst-mentioned container, means connected
with the second-mentioned container and pro
10 jecting into the interior of said cooling cylinder
for introducing said cooling medium into said
container at one of the ends thereof, and means
connected with the second-mentioned container
and the opposite end of said cooling cylinder for
the return ?ow of said cooling medium from said
cooling cylinder into the second-mentioned con
tainer, a branchpipe carried by the second-*men
tioned container and constituting a passage for
the introduction of the liquid cooling medium
20 into the second-mentioned container, a valve sit
uated within the second-mentioned container for
‘ closing and opening said passage, and a ?oat situ
ated within the second-mentioned container and
connected with said valve for operating the same“
the ?rst-mentioned container, a partition wall
within the second-mentioned container, said par 10
tition wall dividing the interior of said container
into an upper chamber and a lower chamber,
means connected with said upper chamber and
projecting into the interior of said cooling cylin
der for introducing said cooling medium into said 15
‘container at one of the ends thereof, means con
nected with said lower chamber and the opposite
end of said cooling cylinder for the return ?ow
of said cooling medium from said cooling cylinder
into said lower chamber, and pumping means
connecting said upper chamber with said lower
chamber.
‘
HEINRICH siiss.
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