GAS ROTARY MACHINE USING DYNAMIC PRESSURE GAS BEARING TOGETHER WITH STATIC PRESSURE USED

摘要

PURPOSE:To prolong the life of a dynamic pressure gas bearing by introducing static pressure of a process gas to the bearing. CONSTITUTION:A pair of thrust dynamic pressure gas bearings 12 are provided in the gaps between the two sides of a thrust runner 11 protruding near a compressor 1 and the mating inner surface 4b of a housing 4, while a pair of journal dynamic pressure gas bearings 13 are formed between the journal and the housing inner surface 4a of the outside surface. A static pressure communication path consisting of a supply hole 14, hollow distribution chamber 15, and exhaust hole 16 is furnished in the bearing housing 4, and the static pressure of 8 process gas is introduced to the dynamic pressure gas bearings with the process gas as a pressure source. Thereby the contact pressure between the rotor and bearing at the time of start and stop is reduced, which prolongs the life of the bearing.