351 汚水用新型ポンプに関する研究(G05-6 流体機械(1),G05 流体工学)  [in Japanese] 351 A Study on a New Type Sewage Pump  [in Japanese]

Sewage pumps are designed with a wide flow channel by, for example, sacrificing some efficiency and reducing the number of blades, in order to prevent plugging with foreign bodies. However, the behavior of foreign bodies which actually flow into a pump is extremely complex, and there are questions about whether the presumed foreign matter will actually pass through. This paper proposes a new type of sewage pump impeller designed to further improve pump efficiency and passability of foreign bodies. The focus of this research was to investigate pump performance and radial thrust in this single blade sewage pump impeller. The results clearly indicated the following facts. The developed sewage pump impeller had high efficiency and exhibited high efficiency over a wide range of flow rates. When experimental and calculated values of radial thrust were compared at the best efficiency point flow rate, both the radial thrust direction and size almost matched.