СПОСОБ СБОРКИ МНОЖЕСТВА ЛОПАСТЕЙ НА РАБОЧЕМ КОЛЕСЕ (ВАРИАНТЫ), А ТАКЖЕ УЗЕЛ РАБОЧЕГО КОЛЕСА ТУРБИНЫИ ЛОПАСТЕЙ

摘要

Rhombic shrouded tangential entry buckets (14) are circumferentially applied to the rotor wheel rim of a turbine. A fixture (26) is releasably secured to a lug (24) on each bucket and includes a chamfered surface (42) for engaging a complementary surface (48) on the lug. Upon applying a tangential assembly force, the shroud (20) and airfoil (16) of adjacent buckets are pre-twisted in a rotational direction about a generally radial axis enabling dovetail faces to contact one another notwithstanding interference fit shroud contacting surfaces (32). The removal of the fixture from the lug enables the bias of the airfoil (16) to rotate the shroud in an opposite direction into final assembly with the shroud edges (30) of adjacent buckets in contact with one another and the dovetail faces (34) thereof in contact with one another.