POWER FEEDER.

摘要

A power feeder for supplying electric power to a load such as a motor for driving a submerged pump that pumps liquid from a tank in which is stored a low-temperature liquid such as LNG. The power feeder has the structure in which a ceramic sleeve is fastened to a flange, a conductor is inserted in the ceramic sleeve, the ceramic sleeve and the conductor being airtightly coupled together inside the flange (inside the tank), and the outside (open air side) is sealed with a bellows having the shape of a half-mountain in cross section. The bellows has resiliency and is mounted between the ceramic sleeve and the conductor under the condition where the ceramic sleeve and the conductor undergoes linear expansion at a maximum practical temperature or at a temperature slightly higher than this temperature and where the bellows itself is displaced to its maximum length. The bellows absorbs the reaction of the conductor when it undergoes linear expansion and exerts compression only on the ceramic sleeve side but does not exert tensile stress.