GB599999A - Improvements in or relating to refrigerating apparatus - Google Patents

Abstract

599,999. Refrigerating. KRAMER TRENTON CO. Sept. 27, 1945, No. 25111. Convention date, Nov. 7, 1944. [Class 29] The evaporator 15 of a compression system is defrosted by hot gas supplied direct from the compressor 1, the gas being condensed in the evaporator during defrosting and the liquid passing to a heat storing element 5, 18 normally heated by the hot gases, where it is evaporated and flows back to the compressor. The defrosting may be automatically controlled by electric timing apparatus. In normal operation, the gas from the compressor 1 passes through a pipe 4 into a coil 8 immersed in a solution of alcohol or ethylene-glycol in an insulated vessel 5 and thence through a condenser 9, receiver 11 and expansion valve 13 to the evaporator 15, returning by pipe 17, tank 18 and pipe 3 to the compressor. When a solenoid valve 30 is opened by the timing mechanism the hot gases pass by pipe 25 coil 27 beneath a drip tray 47 and pipe 29 tothe evaporator. Condensed liquid refrigerant passes through pipe 17 to the hot tank 18 where it flashes into vapour and returns to the compressor. The coil 27 prevents freezing of the drip water. A pipe 51 of small bore returns any oil from the bottom of the tank 18 to the compressor.