| 摘要 |
To reduce a pressure fluctuation in an overlap region between a front portio n of a blade and a rear portion of an adjacent blade, thus reducing the vibration and annoying sound. Provided is a water-jet pump equipped with an impeller 40 which is disposed in a cylindrical housing and driven to rotate. In the impeller plural blades are formed on the outer circumference of a shaft body . A front portion of each one of the blades overlaps a rear portion of the adjacent one of the blades when viewed in the axial direction. Each of rear edges of the blades is formed obliquely towards the upstream side in the rotating direction of the impeller with respect to a corresponding radial direction r to a shaft center O when viewed in the axial direction. Cutaway portions of the respective blades are formed between an outer circumference and the corresponding obliquely-formed portions. The oblique angle of each of the obliquely-formed portions with respect to the corresponding radial direction r to a shaft center O is set in a range from 10.degree. to 60.degree., inclusive.
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