GB365763A - Improved means for removing non-condensable gases from refrigerating apparatus - Google Patents

Abstract

365,763. Refrigerating. LIGHTFOOT REFRIGERATION CO., Ltd. and SINCLAIR, W., Bush House, Aldwych, London. Jan. 7, 1931, No. 586. [Class 29.] Compression machines.-Non- condensible gases, preferably led from the top of the refrigerant reservoir, are passed through two successive compartments of a divided drum-shaped vessel 2 traversed by a coil through which some of the refrigerant (ammonia) is evaporated, so as to condense out the refrigerant from the gases in two stages before the gases are finally discharged to the atmosphere. Liquefied refrigerant from the main condenser expands through a valve 13 and passes by a pipe 12 to the coil, which comprises outer and inner turns 6, 7 in the lower compartment, a rising pipe 9, and inner and outer turns 8, 10 in the upper compartment, and the vapour formed passes through a valve 11 back to the compressor suction. The incondensible gases flow into the drum through a valve 5 and pipe 4 and rise through an opening in a partition 3 to the upper compartment, whence they can be discharged through a shallow liquid seal in a sight glass. The partition 3 is non-conducting, and may be formed by superposed discs 3a, Fig. 5, spaced apart by punchings 35 and formed with slots 36 so that they may be assembled about the riser pipe 9. Open-topped cylindrical baffles 30, 31 may be fitted within the drum. Refrigerant condensed in the drum may be led through a pipe 16 and an expansion valve to the admission pipe 12 of the coil. A thermometer is fitted at 29 and a gauge glass to indicate the refrigerant level in the drum may be connected at 23. The drum has an insulating jacket 27. The device may be controlled by hand valves, or the gas discharge valve may be actuated by a bellows member of a thermostat in the drum, and the independent refrigerant expansion valve by a thermostat dependent on the " superheat " of the refrigerant, while the flow of refrigerant condensed in the drum to the cooling coil may be controlled by a float valve.