screw pump
A pump that uses a helical screw to move water or fluid, often used in engineering or agricultural contexts. Related to 螺子ポンプ.
See also: ねじポンプ
Screw pumps have been used for irrigation since ancient times.
螺子ポンプ is a more general term for screw pump, while 螺旋水揚げ機 specifically emphasizes water lifting.
Compound of 螺旋 (rasen, 'spiral') + 水揚げ (mizuage, 'water lifting') + 機 (ki, 'machine'). The exact historical derivation is uncertain; the term is a modern technical coinage.