高速水潤滑軸受の開発

摘要

近年、地球温暖化対策として、地熟、太陽光、太陽熱等の自然エネルギーを使った発電システムの開発が行われている.従来のバイナリーサイクル発電システムには，フロンR245fa(オゾン破壊係数ODP=0，地球温暖化係数GWP=950），アンモニア(GWP=1桁)，シクロぺンタン(GWP=11)等が使用されている.%We have developed the water lubricated journal bearings and thrust bearings. The journal bearings have 8 grooves with circle profiles on the inner wall, and the thrust bearings have 4 groove with 3 steps lands. Those bearings are used for the water binary generating system used water as working fluid and tested until the design speed 36,000rpm. The unsteady vibrations were observed at low speed range, but steady and very small vibration amplitudes were observed at high speed ranges.