| 摘要 |
In one embodiment, the apparatus incorporates a cylindrical screen member (15) provided with screening perforations (40) which are slotted in section. The perforations are characterized by greater flow area on the inlet side of the cylinder than on the accepts side of the cylinder. More specifically, each of the screening perforations (40) includes a generally funnel-shaped portion (45) on the inlet side of the cylinder which leads to a short parallel sided portion (44) on the accepts side of the cylinder. |
