| 摘要 |
<p>An impeller for pumping or compressing a fluid, the impeller comprising: a back part with integral blades each of which lie on a helical path; a front part with counterpart slots which lie on a helical path and correspond to each of the helical blades, wherein the front and back parts may be screwed together to form one impeller and the two parts may be secured together and simultaneously attached to a motor shaft by one central bolt.</p> |
