| 摘要 |
PROBLEM TO BE SOLVED: To improve the pumping efficiency, and also facilitate machining of respective components such as impeller chambers, nozzles, impellers to inexpensively form closed-type impellers. SOLUTION: A partition wall part (one impeller chamber forming part) 16 and a chamber forming part 15A located at the outer peripheral part of the partition wall part 16 are formed on the end face part of a casing for accommodating a hydraulic motor part, a water-discharge port 18 and a circular partition wall part (the other impeller forming part) 20 formed around the discharge port 18 are formed in a cap body 5B, and plural nozzle forming groove parts 21 are formed on the end face 20a of the partition wall part 20 at equal intervals in the circumferential direction. Then, the cap body 5B is removably attached to the end face of the casing to allow the partition wall parts 16, 20 to be joined to each other at the respective end faces 16a, 20a to form an impeller chamber. Rectangular nozzles are formed with the nozzle forming groove parts 21 and the end face 16a of the partition wall part 16.
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