| 摘要 |
A disk-shaped impeller (42) having on its periphery a multiple radial vanes (56) and a multiple radial impeller grooves (58) is rotatably disposed in a pump housing. On each end surfaces (42a, 42b) of the impeller (42) there are formed a plurality of C-shaped grooves (66). As the impeller (42) is rotated at a higher speed, the fluid in the C-shaped grooves (66) in the impeller (42) acquires a velocity component in an impeller's axial direction to generate a force sufficient to push a pump cover and a pump casing in the axial direction. Accordingly, since it is avoided for the impeller (42) to adhere either the pump cover or the pump casing, the space between the impeller and the housing inner wall is reduced while the possible leakage of the fluid is reduced. <IMAGE> |
