| 摘要 |
<p>The performance of a double-cone device (1) is increased, not only by moving the gap or inlet openings (22) a short distance into the exit cone (47), but also by making the conicity .theta.3 (55) of the so-formed small diffuser le ss than the conicity .theta.2 (109) of the remaining part (53) of the exit cone . Double cone units (7, 60), particularly the ones with this improved diffuser , may be used in pump installations (1, 60), like well-pumps (1), where liquid s must be pumped from great depths.</p> |
