GB526617A - Improvements in refrigerating systems of the inert gas type - Google Patents

Abstract

526,617. Refrigerating. ELECTROLUX, Ltd. March 22, 1939, No. 9105. Convention date, March 26, 1938. [Class 29] Absorption systems. - In a continuous-cycle inert gas system the relative amounts of liquefied refrigerant supplied from the condenser 11 to different parts of the evaporator 12 are varied automatically in response to the load on the evaporator. The condenser comprises a main part 11a which supplies liquid through a vessel 18 and conduit 19 leading to the cabinet-cooling part 12a of the evaporator, and a supplementary part 11b which supplies liquid through a conduit 21 connected to the freezing part 12b. A chamber 46 at the bottom of the evaporator serves to retain a pool of unevaporated refrigerant, and the supply of heat to the generator 10 is controlled by a thermostat 43 on the evaporator. The pool overflows through a seal 47 into the rich gas conduit 26 of the gas heat exchanger 31. A conduit 49 with cooling fins 51 is connected between the bottom of the pool chamber 46 and a sealing vessel 50 and a conduit 52 connects this vessel with the expulsion pipe 17 of the generator. The vessel 50 is also connected by a conduit 53 and the vessel 18 with the supplementary condenser. When liquid refrigerant in vessel 46 evaporates at a faster rate than that at which liquid flows down through the evaporator, as for example when a fresh freezing tray is inserted in the evaporator, the level in vessel 46 will be lowered and the seal in vessel 50 will open the conduit 52 for the passage of generated vapour through vessel 50, conduit 53 and vessel 18 direct to the supplementary condenser, and more vapour will condense in the latter than in the main condenser, and therefore more liquid refrigerant will be supplied to the lower than to the upper part of the evaporator to permit quick freezing. This occurs without affecting the control by the thermal element 43 and without increasing the cabinet cooling unnecessarily. The part 51 in conduit 49 serves as a condenser in starting-up, to provide the liquid trap.