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 (ケーシング・ステータ間のせまい隙間における漏れ損失の低減)

抄録

Centrifugal pumps designed for operation at low flow rates used in various applications such as medical, food processing, chemical, and manufacturing are known to be less efficient than general industrial pumps. To overcome this problem, small double-rotating single screw pump was developed based on the principle of a single-screw pump. The pump mainly consists of a rotor, stator, and casing, with the stator rotating passively as the rotor rotates. Therefore, there are two very narrow gaps between the rotor and the stator, and between the stator and the casing, where the differential pressure inside the pump causes leakage. In this report, improvement of pump efficiency by filling the gap between the stator and the casing with grease to reduce leakage loss was investigated.