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Патент USA US2133105

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Oct. 11, 1938.
A. MESSER
2,133,105
APPARATUS FOR SEPARATING OXYGEN FROM AIR AND
DELIVERING THE OXYGEN UNDER PRESSURE
Filed Oct. 17, 1956
’
IINVENTOR>
440/09” Messer
BY
ATTORNEYS
_
"29133305
Patented Oct. 11, 1938
UNITED STATES PATENT OFFICE
2,133,105
APPARATUS FOR SEPARATING OXYGEN
FROM AIR AND DELIVERING THE OXY
GEN UNDER PRESSURE
'
Adolf Messer, Frankfort-on-the-Main, Germany
Application October 17, 1936, Serial No. 106,166
-
In Germany September 4, 1936 -
4 Claims. (Cl. 62-122)
For drawing the separated liquid oxygen under on will not be cooled sufficiently to impair the
low pressure from an air separating plant and function of these pump operating members.
delivering it to a high pressure, for instance
In the accompanying drawing, there is shown
through an evaporating coil, a pump of the for the purpose of illustration, one form of air
5 plunger type immersed in a body of liquid oxy
separating apparatus embodying the present 5
gen collected in‘a portion of the separating ap
paratus, is not satisfactory. The heat produced
In this drawing there is shown a column Ill’
by the sliding friction of the plunger along the having a heat interchanger II at the upper end,
cylinder walls, ‘and the vacuum produced in and a rectifying section 12 at the lower end.
10 the cylinder, give rise to fractional evaporation Air-under pressure is delivered through a coil 10
or distillation of the liquid oxygen in the cylin
I3 of the heat interchanger H where it passes
der and impairs the e?iciency.
in countercurrent heat interchange relationship
To cool down the liquid oxygen to avoid any with the out?owing nitrogen .and a coil l4 in
evaporation in the pump cylinder while the liq
which the evaporation of the separated liquid
15 uid oxygen is being drawn into the pump, is a. oxygen takes place. The precooled air leaving 16
very expensive and complicated process.
the interchanger ll goes through a coil l5 at
One object of the present invention is to pro
the bottom of the column In throgh an expan- ~
vide an apparatus which is e?icient in operation sion valve l6, and is delivered at the upperv end
and does not have the disadvantages, above re
of a series of trays I‘! in the rectifying section
;50 ferred to.
'
I2 of the column. By this operation, as the 20
In carrying out the present invention in its resulting lique?ed air trinkles downwardly over
preferred form, there is provided a slow run
the trays [1, it is separated into the liquid oxy-‘
ning gear pump for raising the liquid oxygen gen which collects at the bottom of the column‘
against pressure. This gear pump has no slid
l0, and gaseous nitrogen which passes around the
35 ing parts which will create sufficient friction coils of the heat interchanger I l and out through 25v
to evaporate the liquid oxygen, and creates no an outlet la. The coil I4 is provided with a
vacuum which might impair the e?icient opera
valved outlet l9 which delivers the separated
tion of the pump.
'
'
evaporated oxygen to a suitable storage tank
As a feature of the present invention, the main at a substantial pressure controlled by the ad
30 drive shaft of the gear pumpis inclined, up
justment of the valve 20 in said outlet, without 30
wardly from the pump with respect to the hori
the necessity of compressing said evaporated
zontal, and the stu?ing box for the main’ drive oxygen.
shaft and the driving motor are disposed in the
As a feature of the present invention, the liquid
relatively warm outside atmosphere. This in
oxygen collected at the bottom of column [0 is
35 clination of the main drive shaft is preferably delivered to the inlet end of the coil l4 in the heat 35
such that the stu?ing box will be near the maxi
interchanger H through a gear pump 2| having
mum level of the liquid oxygen in the air sepa
an inlet 22 and an outlet 23, the two gear mem
rating column, so that there is little or no pres
bers of the pump being operated at low speed
invention.
.
sure of the liquid oxygen‘ acting on said stuffing
40 box. Furthermore, by providing an inclined
shaft, any liquid oxygen evaporated along the
shaft will rise to the level of the stu?ing box
and will act somewhat as an insulation against
‘ heat conduction from the outside atmosphere,
(5 and prevent-the in?ow of further liquid oxygen.
As a further feature, there is provided a vari
able speed transmission between the motor and
the drive shaft, whereby the speed of the pump
may be regulated in accordance with the quan
59 tity and pressure desired in the liquid oxygen.
Since the motor, the variable speed transmis
sion, and the stu?ing box for ‘the main drive
shaft, are disposed away from the cold region
of the separating apparatus and in the warm
55 outside atmosphere, the‘ lubricating agents there
’
'
through a gear arrangement, such as a worm
and worm wheel, from a main drive shaft 24. 40
This shaft 24 is encircled by a tubing or sheathing
25 which slants upwardly» and outwardly as
shown.
,
The shaft 24 is operated from an electric motor
26 and the speed of rotation of said shaft is con- 45
trolled by a variable speed transmission 28 which
may be adjusted by a suitable control handle 30. i
The shaft 24 is supported by a hearing which is
mounted outside the cold region of the separating
apparatus so as to be in contact with the warm 50
outside air, said bearing comprising or including
a stuf?ng box 32 to prevent leakage of oxygen
therethrough.‘ The stu?ing box and the shaft 24
are preferably so arranged that the stu?ing box
will be at substantially the maximum level of the 55
2
2,183,105 '
liquid oxygen in the bottom of the column ll, so
that the liquid oxygen in the tubing 25 acts with
and slanting upwardly and outwardly from‘the
little or no pressure on said stufiing box. Further
latter.
coil, and a main drive shaft for driving said pump
more, by means of this arrangement, any
3. An apparatus for separating oxygen from
evaporated oxygen will rise along the shaft 24
air, which includes a recti?cation column in the 5
bottom of which the liquid oxygen separates and
collects, a liquid oxygen evaporating coil, a gear
pump in the bottom of said column for forcing
and be trapped at the upper end thereof so as to
serve as a heat insulation to prevent the conduc
tion of heat into the main body of the liquid oxy
gen and prevent liquid oxygen from ?owingup to
10 the stu?lng box.
Having thus described my invention, what I
claim as new and desire to secure by Letters
Patent is :-
1. An apparatus for separating oxygen from
15 air, which includes a recti?cation column in the
bottom of which the liquid oxygen separates and
collects, a liquid oxygen evaporating coil, a pump
in the bottom of said column for forcing the
separated liquid oxygen through said evaporating
20 coil, and having a drive shaft extending to the
the separated liquid oxygen through said evap
orating coil, a main drive shaft for driving\said 10'
gear pump and slanting upwardly and outwardly
from the latter, a motor for driving said shaft,
and a stuffing box for said main drive shaft, said
motor and said stu?lng box being disposed outside
of the cold region of the column and in the warm
er outside atmosphere.
15
4. An apparatus for separating oxygen from
air, which includes a recti?cation column in the
bottom of which the oxygen separates in liquid
form, a heat interchanger including an oxygen 20
exterior of the apparatus, a easing‘encircling said . evaporating coil having an outlet leading to a
shaft, and a stuffing box disposed at the outer storage holder, a rotary pump at the bottom of
end of said casing outside ‘the cold region of the said colunm for forcing the separated liquid
column and in the warmer outside atmosphere.
oxygen through said evaporating coil, a shaft
2. An apparatus for separating oxygen from extending upwardly and outwardly from said
air, which includes a recti?cation column in the pump, a tubular casing encircling said shaft and
bottom of which the liquid oxygen separates and open at the lower end, and a stumng box at the
collects, a liquid oxygen evaporating coil, a pump outer upper end for trapping gaseous oxygen in
in the bottom of said column for forcing the said casing.
30
30 separated liquid oxygen through said evaporating
ADOLF MESSER.
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