| 摘要 |
PURPOSE:To simplify the precision finishing of the inner face of a vane and return vane case and the like by constructing an upper-stage outside return vane as well as a lower-stage return vane in one body with the case and combining the case with a speed ring constrcted in one body with a spiral casing. CONSTITUTION:The water in a spiral casing 6 opens a guide vane 5, passes through a speed ring 7, works on an upper runner 3, and rotates a rotation part. Furthermore, the water issued from the upper runner 3 is uniformed in its flow by an upper-stage inside return vane 8, an upper-stage outside return vane 9, and a lower-stage return vane 10, works on an lower-stage runner 4, gives a greater rotational force to the rotation part, passes through an upper suction pipe 22, and is discharged to a lower reservoir via a lower suction pipe 23. |
