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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.