| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump device capable of attaining high lifting while preventing increase of power consumption.SOLUTION: A pump portion 40 of a pump device 10 includes a casing 50, and impellers 80, 90 accommodated in the casing 50, and disposed on a rotating shaft 20 in a state of being rotatable in accompany with rotation of the rotating shaft 20. The first impeller 80 has a blade groove only on one face. The second impeller 90 has a blade groove only on one face. The casing 50 includes a casing cover 54 to which the rotating shaft 20 is rotatably inserted, a casing body 60 accommodating the impellers 80, 90 between the casing body and the casing cover 54, and an intermediate casing 70 which is disposed between the first impeller 80 and the second impeller 90, and to which the rotating shaft 20 is rotatably inserted, and the intermediate casing 70 partitions a first pump chamber P1 accommodating the first impeller 80 and a second pump chamber P2 accommodating the second impeller 90.SELECTED DRAWING: Figure 1 |
