Variable inlet guide vane

Claim 1

A heated inlet variable guide vane assembly for a gas turbine compressor inlet comprising: an outer casing; an inner casing, forming an annular airflow passage between said inner and outer casings; an airfoil having openings therethrough for the passage of heated air, an air inlet end, and having a convex side and a concave side; a trunnion having an axis and secured to said airfoil at the air inlet end and offset toward the concave side of said airfoil, and rotatably secured in said outer casing; a second trunnion at the other end of said airfoil coaxial with said first trunnion and rotatably secured to said inner casing; means for selectably positioning said airfoil around said axis; a button interposed between said first trunnion and said airfoil, and having a planar surface perpendicular to said axis and facing said first trunnion; said planar surface having a recess therein in fluid communication with an opening within said airfoil; a seal on said planar surface surrounding said recess and abutting the inner surface of said outer casing; and an air supply opening located in said outer casing adjacent to said first trunnion, and said recess in fluid communication with said air supply opening.