| 摘要 |
PCT No. PCT/AU96/00734 Sec. 371 Date Sep. 29, 1998 Sec. 102(e) Date Sep. 29, 1998 PCT Filed Nov. 14, 1996 PCT Pub. No. WO97/21927 PCT Pub. Date Jun. 19, 1997An impeller for a centrifugal pump which includes a front shroud and a rear should, the shoulds being spaced apart so as to form a plurality of passageways therebetween which are separated by a plurality of impeller blades. The impeller has an outer diameter D2 and an inlet diameter D1. Each passageway has an inlet portion with a passage outlet B2, and an intermediates portion between the inlet and outlet portions. In the inlet portion the front shroud is curve away from the rear shroud so that the passageway outlet width B2 is less than the passageway inlet width B1. A method of increasing the Best Efficiency Point Flow rate comprises providing such an impeller and also providing a new front liner or throat bush which has an inner wall which is complementary to the wall of the inlet portion of the impeller while retaining the same main liner or casing section.
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