| 摘要 |
A fluid compressing apparatus (11) includes a casing (13), a compressing unit (15) disposed in the casing, a motor-drive unit (17) located in the casing for driving the compressing unit, and a bearing unit (21, 33) for rotatably supporting the rotational shaft (23) of the motor-drive unit. The fluid compressing apparatus also includes a refrigerant of HFC-134a (CH2FCF3) and a prescribed amount of polyglycol, as a lubricating oil, stored in the casing. The bearing unit and the rotational shaft satisfy the following relationship: C2 </= 2 x So wherein C2 is a gap between the rotational shaft and the bearing unit in a radial direction, and So is a total surface roughness of the outer surface of the rotational shaft and the inner surface of the bearing unit. |
