WHEEL OF HYDRAULIC MACHINE Russian patent published in 1994 - IPC

FIELD: hydraulic machines. SUBSTANCE: conical channels 5 in vanes 2 of hydraulic machine wheel are arranged in several rows along lines equidistant to peripheral edge of vane 2 in staggered order and are directed to lower pressure side at different angles relative to peripheral edge. Angle of tilting of first row is 0 degrees, angle of tilting of second row is 15 degrees and that of third row, 30 degrees. Pitch between rows of conical channels 5 and peripheral edge is (0.01-0.02)D₁. Pitches of first row conical channels 5 are: from inlet edge 0.01D₁; between following conical channels 5: to axis of turn of vane 2 (0.05-0.1)D₁ and from axis of turn of vane 2 (0.10-0.2)D₁. Pitches of second and third row conical channels are displaced relative to first row and relative to each other by 1/3. Arrangement of conical channels 5 is chosen to concentrate outlet streams in one point near peripheral edge of vane 2. EFFECT: reduced intensity of destruction of vanes 2 and wheel chamber by slot cavitation between them. 3 dwg