| 摘要 |
PROBLEM TO BE SOLVED: To provide an impeller such as a turbine wheel that can reduce its inertia force while securing required strength.SOLUTION: This invention relates to an impeller comprising a top part, a bottom part, a hub face part having a rotation object shape widened from the top part toward the bottom part and blade parts installed on the hub face part. The impeller is formed by laminating and molding a shell part including the blade parts and the hub face part and a core part which is inside the shell part and has a lower density than that of the shell part, and preferably a relative density of the shell part is 99% or more and a relative density of the core part is 30% or more.SELECTED DRAWING: Figure 1 |
