| 摘要 |
<p>A spiral rod (9) runs axially between the base section (5) and the head section (3) of the rotor. Profiles (7) parallel to the axis, support the spiral. These are concave over their lengths. On the base section (5), a rotary bladed wheel (11) sets the spiral into rotation. Its axis coincides with the longitudinal axis of the spiral. Base, rod and profiles form an integral component. There are two profiles (7.1, 7.2). Between head and base, the spiral makes two or more turns. Between the two profiles, each section of the spiral makes half a turn. The head is integral with the spiral(s).</p> |
