SPLIT TYPE BLADE FOR WIND MILL, AND THUNDER-PROOF DEVICE OF WIND MILL

摘要

PPROBLEM TO BE SOLVED: To prevent breakage of a coupling member and a split type blade and protect a wind mill having the split type blade from a thunderbolt by preventing the generation of the thunderbolt to the coupling member made of a metal used in the split type blade for the wind mill. PSOLUTION: A thunder-proof fitment of the windmill 1 is provided with the split type blade 4 for the windmill formed such that it is divided at a central part in the direction of length into an inner aerofoil part on the blade root side and outer aerofoil part 4T on the blade end side and the inner aerofoil part 4R and the outer aerofoil part 4T are intercoupled through coupling members 6 and 7 made of a metal. The thunder-proof device for the windmill is provided with a metal sheet 8 located between the inner aerofoil part 4R and the outer aerofoil part 4T and electrically insulated from coupling members 6 and 7; an electro-conducting cable 14 in an aerofoil part 4R situated in a manner to extend from the metal sheet 8 to the external part of a blade via the blade root part of the inner aerofoil part 4R; electro-conducting means 13, 12, and 11 connected to the electro-conducting cable 14; and a touch-down metal sheet 10 embedded in an earth. PCOPYRIGHT: (C)2006,JPO&NCIPI