Patent ID: 7837523
Filing Date: 2010-11-23
Classification: B63H

Abstract:
1. A water-jet pump comprising: a cylindrical housing; and an impeller disposed in the cylindrical housing and configured to be rotated in a rotating direction, the impeller comprising: a shaft body having an outer circumference and an axial direction; and plural blades provided on the outer circumference of the shaft body and each of the plural blades having a front portion and a rear portion along the axial direction, the front portion of one of the plural blades overlapping the rear portion of another of the plural blades adjacent to said one of the plural blades when viewed in the axial direction, wherein, when viewed in the axial direction, at least a part of a rear edge of the rear portion is formed obliquely with respect to a radial direction of the impeller towards the rotating direction, and wherein a cutaway portion is formed in each of the plural blades between said at least a part of the rear edge and the outer circumference of the shaft body.