| 摘要 |
<p>5 There is provided an impeller arrangement (200) for location in an impeller housing (102, 104) delimiting a housing inlet (110), the impeller being rotatable about an axis of rotation (X-X) and comprising a base (206), a shroud (208) and a plurality of blades (210) located therebetween, the shroud (208) comprising an impeller inlet (212) defining a passageway extending to the plurality of blades (210), wherein the impeller 10 arrangement (200) further comprises a barrier arrangement (214) located adjacent the impeller inlet (212) and arranged to receive, or extend into, a portion of the impeller housing (102, 104) surrounding the housing inlet (110) to restrict airflow between the impeller housing (102, 104) and the shroud (208). By providing such an arrangement, inlet losses to the impeller can be reduced when compared to known arrangements. A 15 barrier arrangement provided on the shroud of an impeller is located in close relationship with a complementary portion of the volute adjacent the air inlet. The interaction between these components forms a barrier to bleeding of the airflow away from the inlet, reducing the likelihood of air passing between the shroud and volute housing and improving the inlet efficiency of the impeller. x x</p> |
