| 摘要 |
PURPOSE:To prevent thermal deformation of a bearing housing by a method wherein the captioned device is provided a bearing for supporting a rotary body and a gas bearing composed of a bearing housing to support the bearing, and said bearing housing is formed by a material having higher thermal conductivity than that of the bearing. CONSTITUTION:Gas of a high pressure and low temperature flows through an inlet 1, to be subjected to adiabatic expansion in a rotor 3 arranged at one end of a shaft 2, flows to an outlet 4 as low pressure gas of further lower temperature and then a fan 5 arranged at the other end of the shaft 2 is rotated. On the other hand, a thrust is supported by a bearing housing 7 and a thrust bearing through a thrust plate 6 arranged at the central part of the shaft 2, and the shaft 2 is supported by a bearing 8. In this case, the bearing housing 7 is made of material having higher thermal conductivity than that of the bearing 8, for example, electric copper. Thereby, a heat generated at the bearing 8 is efficiently transmitted to the bearing housing 7 to prevent thermal deformation of the bearing housing 7. |
