| 摘要 |
PROBLEM TO BE SOLVED: To provide an impeller enhancing performance by reducing slipstream loss of blades, while preventing reduction of a head.SOLUTION: An impeller having a plurality of blades 4 having positive pressure surfaces 11, negative pressure surfaces 12, and rear fringe parts 13 connecting the positive pressure surface 11 and the negative pressure surfaces 12, and compressing and feeding fluid F flowing in from an axial direction by being rotated around an axial line outward in a radial direction is characterized in that the positive pressure surfaces 11 have rear fringe side positive pressure surfaces 21 curved toward rear sides in a rotating direction R as going outside in a radial direction of the axial line and connected to the rear fringe parts 13, the negative pressure surfaces 12 have first negative pressure surfaces 22 curved toward rear sides of the rotating direction R as going outside in the radial direction and second negative pressure surfaces 23 connected to the first negative pressure surface 22 and curved toward the positive pressure surfaces 11 as going outside in the radial direction and connected to the rear fringe parts 13. |
