| 摘要 |
PCT No. PCT/NL82/00010 Sec. 371 Date Dec. 1, 1982 Sec. 102(e) Date Dec. 1, 1982 PCT Filed Apr. 2, 1982 PCT Pub. No. WO82/03425 PCT Pub. Date Oct. 14, 1982.A rotatable shaft is provided with a plurality of blades each fixed at one end to the shaft and extending radially outwardly therefrom. Each of the blades has at least one gate or opening for the passage of fluid therethrough, and a slide movable between an inner position overlapping the blade and an outer position extending radially therefrom. The slide has means for opening said gate in one position and closing said gate in the other position. A cam for selectively moving said slide between said inner and outer positions is provided on a support for the shaft.
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