AIR BLEEDER

PURPOSE:To make it possible to extract a noncondensible gas outside effectively and simplify the device and its components by installing a gas extraction tank whose surface is partially cooled with refrigerant a cold water, and a gas extraction pipeline which connects the gas extraction tank with a vapor phase section on the down stream side of a condenser. CONSTITUTION:A gas extraction tank 21 has its one side placed in contact with the surface of a refrigerant tank 4 or shares its side with the tank 4. The tank 21 is always cooled with a refrigerant solution which flows down along the wall of a vaporizer 1. Therefore, the internal pressure in the extraction tank 21 can be kept to a lower value substantially near to the internal pressure in the refrigerant tank 4. A gas extraction pipeline 22 is connected between a lower manifold 17 of an air-cooled condenser 15 and the gas extraction tank 21. Therefore, the noncondensible gas in the lower manifold 17 flows into the extraction gas tank 21 with vapor due to the difference between the pressures where only the vapor content is condensed and liquefied while the noncondensible gas is gradually built up inside the gas extraction tank 21. This construction makes it possible to extract the noncondensible gas in an absorption type refrigerator effectively outside and provide a gas extraction unit which is simple in structure and highly reliable in performance.