WINDWHEEL BLADE Russian patent published in 2012 - IPC F03D1/06 

FIELD: power industry.

SUBSTANCE: windwheel blade includes tubular spar and sections into which a blade is divided along the span. Spar is made so that it is lowered from the blade outline. Sections include covers and ribs. Sections include connection profiles arranged between covers and flanges of spar and connection parts installed on webs of ribs, which are attached to the above profiles. Connection parts are attached by means of fasteners to spar webs. Adjacent sections are connected by means of connection straps to each other with possibility of mutual movement. Separation of blade into sections is made so that at least two ribs in the most loaded sections are connected by means of connection and fastening parts to spar. Connection profiles in them are disconnected from spar flanges. As for other ribs, connection parts and connection profiles are made and mounted so that a gap is formed between them and spar along webs and flanges by the value of spar deflections. Protective patches are installed on the spar in the zone of connection parts and connection profiles.

EFFECT: increasing the blade service life.

1 cl, 9 dwg