Guide vane arrangement in reversible pump-turbines and pumps

摘要

1,116,828. Hydraulic turbines; centrifugal pumps. HITACHI Ltd. Nov. 26, 1965 [Jan. 25, 1965 (2)], No. 1778/67. Divided out of 1,116,727. Headings F1C and F1T. To reduce vibrations in a circular row of adjustable guide vanes 4, 5, 6 of a pump or pumpturbine of the Francis type, the ratio SPr/SP1SP-r/SP2SP/AE /SPis between 0À15 and 0À05. The row of adjustable guide vanes is surrounded by a circular row of fixed guide vanes (not shown).