| 摘要 |
<p>The invention relates to an improved high pressure Oil Header with submerged leakage oil discharge for blade turning mechanism of Kaplan turbines, the oil header (10) mounted on the top shaft of the generator to supply high pressure oil to a runner servomotor through a plurality of concentric metallic tubes (9) rotating in registration with the rotation of the turbine blades, the rotating tubes acting as a continuous oil passage from the generator up to a servo chamber disposed inside the (12, 13, 14) with sealing means provided to allow efficient operation of blade movement and minimize oil leakage, the improvement is characterized in that a first plurality of throttle grooves to minimize oil leakage constructed on the bearing bushes (12, 13, 14) extending till a location where a relief chamber (15) is provided for oil bleed off tapping (16) to relieve oil pressure; a second plurality of throttle groove provided after the bleed off (16) to ensure both reduction in oil pressure and minimization of oil leakage one each oil chamber (18, 21) provided respectively at top and bottom bush ends (12, 14) to allow the pressurized leakage oil jets to be submerged instead of directly discharged to the atmospheric air; multiple divergent and angular exit grooves (20) in a direction opposite to the rotational direction of the turbine blades are configured on an end relief groove (19) formed beyond the second plurality of throttle grooves to ensure exit of leaking oil at a low velocity.</p> |
