| 摘要 |
A variable rating impeller (10) for the pump of a waterjet unit that is rotatably driven by an engine to generate a high velocity jet stream. The impeller (10) having a hub (12) mountable to a rotating shaft through which an input power is transmitted by the engine, and a plurality of blades (18) spaced about the periphery of the hub. The blades (18) have a primary profile that defines the primary rating of the impeller, and a trailing portion (28) of each blade has resilient flexibility relative to the primary profile such that the trailing portion will progressively flex under hydrodynamic load to alter the profile of the blades to progressively lower the rating of the impeller (10) with increase in engine speed. |
