| 摘要 |
PURPOSE:To prevent the pollution due to the outside discharge of a stream and the deterioration of workability caused by it by arranging an axial-flow impeller and a nozzle in a cylindrical closed casing, providing a discharge port on a casing wall, and communicating it to a water return pipe. CONSTITUTION:The high-pressure water fed to a high-speed jet stream forming body 4 hits an axial-flow impeller through a nozzle 11, and is returned to a water feed tank WT through a water return conduit 7 from a discharge port 18. A casing 1 is made with a cylindrical closed body and is sealed, thereby the outside fluid is prevented from flowing into the casing via the rotation of the impeller and the water stream is not discharged outside, thus the rotating performance of the impeller is improved, and the pollution of the water and the deterioration of workability caused by it can be prevented. |
