| 摘要 |
846,845. Liquefraction of gases. SULZER FRERES S. A. Feb. 24, 1959 [March 28, 1958], No. 6397/59. Class 8(2). Apparatus for cooling difficultly liquefiable gas to low temperatures comprises a highvacuum tank 1, having a domed top 12, under an absolute pressure of not more than 10-<SP>3</SP> mm.Hg. and a pre-vacuum tank 13 at an absolute pressure of 10-<SP>3</SP> to 102 mm. Hg. The tank 1 houses heat exchanges 2, 3 and the lines 7, 11 for refrigerant and gas respectively all the connections between the parts in this tank being mechanically non-detachable, e.g. the connections are made by welding or soldering. The lines 7, 11 extend through the dome 12 to the pre-vacuum tank which houses the parts connected to the lines by mechanically detachable connections, e.g. screw joints, bayonet joints, such parts are the valves 21, 22, 23, 24, throttle valves 16, 17 which are controlled by pneumatic servo-rotors 25, 26, and any filters and thermocouples secured in the lines. Overhauling the valves etc. may thus be performed without opening the high vacuum tank 1 to atmosphere. The top of the tank 13 is preferably doubled walled in the intermediate space 15 of which a high vacuum is maintained. |
