| 摘要 |
<p>An impeller (18) includes first and second impeller portions (30,32) that are secured to one another. An interior cavity (34) is formed between the first and second portions (30,32). The first impeller portion (30) supports multiple blades (20). The first and second impeller portions (30,32) respectively include first and second surfaces (40,42) that are secured to one another near a tip (33) of the impeller (18). Inlet and outlet apertures (38,36) are provided in the impeller (18) and are in communication with the inner cavity (14) to provide a cooling flow path there through. A circumferential gap (48) is arranged between the first and second impeller portions (30,32) opposite the tip (33) to permit relative axial movement between the first and second impeller portions (30,32) during centrifugal loading of the impeller.</p> |
