| 摘要 |
This invention relates to an improvement on a centrifugal pump including: a casing defining an inlet path extending at the axial portion thereof, a turbine chamber communicating with the inlet path, and an outlet path disposed at the outer periphery portion of the turbine chamber; a drive shaft rotatably held in the casing; and a turbine fixed on the drive shaft and disposed rotatably in the turbine chamber. The turbine includes a disk shaped back plate fixed on the drive shaft; a plurality of blades formed integrally on a surface of the back plate at the inlet path side, extending in the axial direction, and disposed radially at intervals of equal angle; a cup shaped movable disk plate having a plurality of blade inserting holes being substantially larger than the cross sectional configuration of the blades, disposed movably on the drive shaft in the axial direction relatively with respect to the back plate, and forming a pressure chamber between itself and the back plate; and an urging member for urging the movable disk plate in the direction to the back plate; wherein pressure adjusting holes communicating with the pressure chamber are formed in the back plate or the movable disk plate at portions thereof adjacent to the drive shaft.
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