| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump device capable of improving assembly work efficiency while preventing deterioration of performance.SOLUTION: A cascade pump device 10 includes a pump 30 having an impeller 20, a driving part 80 having a rotating shaft 60, a connection structure 90, a double nut 100, and a disc spring 110. The connection structure 90 connects the impeller 20 to the rotating shaft 60 so that the impeller 20 is movable to the rotating shaft 60 in an axial direction of the rotating shaft 60 and the impeller 20 and the rotating shaft 60 are integrally rotatable. The double nut 100 is provided on one side of the impeller 20 in the rotating shaft 60, and a fixing position to the rotating shaft 60 is movable in the axial direction, and movement of the impeller 20 is regulated by abutment of the double nut 100 with the impeller 20. The disc spring 110 is disposed between a rotation ring 43 of a mechanical seal 41 and the impeller 20, and energizes the impeller 20 to the double nut 100 side along the axial direction.SELECTED DRAWING: Figure 1 |
