SCREW WITH TWO DIFFERENT VECTOR WHIRL WATER BLADES IN ONE

摘要

PURPOSE: A screw for generating dual water whirls with different directionalities is provided to increases the suction and discharge heads of a liquid pump and the straight propulsion of a ship or a torpedo. CONSTITUTION: A screw for generating dual water whirls with different directionalities comprises a rotary shaft, central screws(120), and outer screws(130). The central screws are connected to the rotary shaft. The outer screws are integrally connected to the central screws and arranged to cover the central screws. The outer screws have rotary pipes and blades. Both sides of the rotary pipes are perforated. The blades are inclinedly attached on the outer surfaces of the rotary pipes and are outward bent from the outer surfaces of the rotary pipes.