| 摘要 |
PROBLEM TO BE SOLVED: To improve the water jetting pressure by arranging a spiral vane wheel in the tip of a vane axle, and arranging a peripheral edge thereof close to the inner surface of a main body casing, and providing a straightening twist type guide vane in rear and over the vane. SOLUTION: Two spiral vane wheels 10 are wrapped around a hub 9 connected to a lower end of a vane axle 8, which is directly connected to an engine 7, and the tip of the vane wheel 10 is extended to a suction duct 5 provided under. Since the spiral vane wheel 10 is used, water jetting pressure is accelerated and increased by the continuous twisted vane surface, and a space between vanes can be widened so as to prevent the clogging due to refuse. A starting end of a guide vane 12, which is provided between a main body casing 6 and a bearing casing 12, is formed into the spiral shape, and a finish end thereof is stood in parallel with the axis of the main body casing 6 so as to form plural straightening flow passages, and the spiral turning flow, which is pressurized and accelerated by the vane 10, is radially guided, and straightening is performed by the finish end of the guide vane 12. |
