Defrosting arrangement and control for refrigeration apparatus

Claim 1

A REFRIGERATION SYSTEM HAVING A CIRCUIT FOR CIRCULATION OF ABSORPTION SOLUTION INCLUDING AN ABSORBER AND A HIGH TEMPERATURE PLACE OF HEATING WHERE VAPOROUS FLUID IS EXPELLED FROM SOLUTION TO MAINTAIN A SUPPLY OF SUCH FLUID, A CONDENSER AND A COOLING ELEMENT, MEANS INCLUDING SAID CONDENSER PROVIDING A FIRST PATH OF FLOW OF FLUID FROM SAID PLACE OF HEATING TO SAID COOLING ELEMENT, A GAS CIRCUIT INCLUDING SAID COOLING ELEMENT AND AID ABSORBER FOR CIRCULATING GAS THEREIN BY A FORCE DEVELOPED BY THE DIFFERENCE IN SPECIFIC WEIGHT OF COLUMNS OF GASEOUS FLUID, A BY-PASS CONNECTION AROUND SAID CONDENSER PROVIDING A SECOND PATH OF FLOW FOR VAPOROUS FLUID FROM SAID PLACE OF HEATING OF SAID COOLING ELEMENT, SAID BY-PASS CONNECTION INCLUDING A TRAP, MEANS TO SUPPLY LIQUID TO SAID TRAP TO BLOCK FLOW OF VAPOROUS FLUID THERETHROUHG, MEANS FOR REMOVING LIQUID FROM SAID TRAP INCLUDING A TUBE FOR WITHDRAWING ABSORPTION SOLUTION FROM SAID CIRCUIT AT ONE LEVEL AND RAISING THE WITHDRAWN SOLUTION OF A HIGHER LEVEL BY VAPOR-LIQUID LIFT ACTION, AND MEANS FOR SEPARATING THE RAISED SOLUTION AND LIFTING VAPOR PASSING FROM THE UPPER END OF SAID TUBE AND CONDUCTING THE RAISED SOLUTION TO SAID ABSORBER TO REDUCE THE FORCE DEVELOPED IN THE GAS CIRCUIT FOR CIRCULATING GAS THEREIN.