GB910070A - Improvements in and relating to refrigerators of the vapour-compression type - Google Patents

Abstract

910,070. Refrigerating. PRESSED STEEL CO. Ltd. May 10, 1961, No. 16966/61. Class 29. In a compression refrigeration system refrigerant from the condenser 11 is supplied to the evaporator 15 via a plurality of capillary restrictor tubes, e.g. two, 16 and 17, as shown in Fig. 1, which progressively become operative or inoperative to regulate the refrigerant supply. The capillary 16 is connected to a liquid receiver 18 at the bottom of the condenser and the capillary 17 to a higher pass of the latter so that when the compressor is restarted after the evaporator has been defrosted liquid refrigerant accumulates in the condenser to a level above that of the capillary 17 and both tubes initially supply liquid refrigerant to the evaporator. As the evaporator pressure and the liquid refrigerant level in the condenser drop the capillary 17 transmits first a liquid/vapour mixture and finally vapour only. The size of the capillary tube 16 is such that the liquid seal in the receiver 18 is maintained at the lowest evaporating temperature. It is stated that the system results in the evaporator being brought down to its thermostatic cycling temperature after defrosting more quickly than is possible with a single restrictor. In Figs. 5 and 6 (not shown), three capillary tubes having connections at different levels in a liquid receiver from the condenser are employed in a refrigeration system using reverse cycle defrosting. The said liquid receiver may be made from a transparent material.