Penult-stage blades of large-sized full-speed steam turbine

• Main Author: QIGUO,DU YANG
• Format: Patent
• Language: English
• Published: 27.12.2006
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; STEAM ENGINES; WEAPONS

The utility model discloses a last-stage blade of a large-sized full-speed steam turbine, which relates to a turbine blade and aims to solve the problems of low work efficiency and unsafe operating process of the existing turbine blades. The utility model is composed of a shroud band part (1), a blade molded line part (2), a mesosome part (3) and a blade root part (4), wherein the blade molded line part (2) is a variable cross-section twisted blade, namely that the two adjacent cross sections twist oppositely; the height H of the blade molded line part (2) is 483mm, and the areas of the cross sections are reduced gradually with the increase of the blade height; the blade root part (4) is the four-tine type blade root with equal strength, the axial width W of the blade root is 97.5mm, and the total height K of the blade root is 84mm. Through the actions of rationally controlling the degree of reaction of the blade root of 483mm and properly adopting the negative incidence, etc., the safety and the high efficiency of the last-stage blade design of wet cold units are organically combined. The blade of 483mm has high varying duty performance, so that the units are ensured to operate safely and highly effectively under the varying duty condition.