| 摘要 |
PURPOSE:To finely divide air or gas, by adjusting the upper stage part of a screw to bring the same to an angle for generating a water stream in an axial direction while adjusting lower stage part thereof so as to be capable of generating a water stream in a radial direction with respect to the axial direction. CONSTITUTION:A screw 5 consists of an upper stage part 5a and a lower stage part 5b having different shapes. The upper stage part screw 5a has such a structure that the outer periphery of the hollow shaft thereof is entirely wound in a spiral form and the screw plate thereof is made linear in the outer periphery radial direction of the hollow shaft. On the other hand, the lower stage part screw 5b is formed into a spiral shape continued to the upper stage part screw 5a and the cross-sectional area of the screw plate thereof has such a structure that the member provided to the outer peripheral surface of the hollow shaft so as to be protruded therefrom is slightly curved to be formed into a retracted blade configuration. By this structure, the contained air is divided into finer air bubbles. |
