| 摘要 |
PURPOSE:To hold a liner positively, by forming an impeller duct body with an aluminum alloy as well as forming a liner with a material stronger in strength than this aluminum alloy, and casting the liner in the duct body. CONSTITUTION:An impeller duct 19 is provided with a liner 36 in an inner circumferential wall of a duct body 35 housing an impeller 14. This duct body 35 is formed with an aluminum alloy, while the liner 36 is formed with a material stronger in strength than this aluminum alloy, for example, stainless steel. The liner 36 is unitized in one in a state of being cast in the inner circumferential wall of the duct body 35. Therefore, the liner is made positively holdable to the duct body.
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