| 摘要 |
581,493. Axial-flow pumps and turbines. GILL, J. H. W. May 24, 1944, No. 10020. [Classes 110 (i) and 110 (iii)] [Also in Group XXXIII] Varying angular position of blades.-In an axial-flow turbine or pump rotor or propeller in which the blades are rotatably supported in the hub, each blade B has a root spigot B<1> bearing in the hub A at B<2>, B<3> and lying parallel to the spigot C<1> of the opposite blade C, so that the blades have adequate support. The spigots B<1>, C<1> carry arms D, E extending longitudinally of the hub, and operated by links from an axially-sliding control rod, the spigots having interengaging teeth B<4>, C<4> to ensure that the blades are rotated equally; the longitudinal arrangement of the mechanism permits the use of long levers in a relatively small hub. If there are two pairs of blades, each pair is arranged in the above manner, in a plane parallel to that of the other pair, and the angle between the pairs of blades may be made such that each of the second pair of blades will be approximately central in one of the air streams passing between the blades of the first pair: more than two pairs may be used, and the pairs may be parallel inclined or at right angles to each other. According to the Provisional Specification, the control rod may be moved in the hub to effect rotation of the blades or the rod may be fixed and the hub moved axially by means such as an adjustable thrust bearing. The control may be automatically effected by mechanism responsive to changes in speed or loading of the rotor; arrangements of weights acting by centrifugal force in addition to or in place of other control means are referred to.
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