低流量小型二重回転一軸スクリューポンプの性能向上に関する研究

（円筒状隙間にグリースを封入した際のシール持続性に関する検討）

抄録

Centrifugal pumps designed for small-flow operation, used in various applications such as medical, food processing, chemical and manufacturing, are known to have lower efficiency than general industrial pumps. To overcome this problem, a compact double-rotating single-axle screw pump has been developed based on the principle of the single-axle screw pump. In this pump, the stator rotates passively as the rotor rotates. Therefore, two structural gaps exist between the casing and the stator and between the stator and the rotor. Previous studies have shown that pump performance can be improved by sealing grease between the casing and stator. In this study, with the aim of investigating the seal persistence of grease sealed in the cylindrical gap between the casing and the stator, the seal persistence of grease was investigated when the pump was operated for a long time with the pump pressure fixed at an arbitrary pressure as the initial condition and when the pump pressure was continuously changed from low to high pressure and repeatedly loaded.