Steam turbine rotor blade and manufacturing method and remodeling method of steam turbine rotor blade

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United States of America Patent

PATENT NO 11739648
SERIAL NO

17531207

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Water droplets that are moved on blade surfaces of a rotor blade are effectively guided toward the blade trailing edge while influence on the strength of the rotor blade is suppressed. A steam turbine rotor blade having a tie-boss for joining to adjacent blades at an intermediate position in the blade length direction is provided. The steam turbine rotor blade includes an airfoil part in which a blade surface is partly hollow as viewed in a section obtained by cutting by an orthogonal plane to a rotation center line of a turbine and a recessed blade surface that is this hollow partial blade surface passes through the blade root side of the tie-boss at least in a region on the pressure side and extends in a strip shape in the blade chord length direction.

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Patent Owner(s)

Patent OwnerAddress
MITSUBISHI HEAVY INDUSTRIES LTD5-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kudo, Takeshi Tokyo, JP 66 1235
Sasao, Yasuhiro Tokyo, JP 12 12
Tabata, Soichiro Tokyo, JP 24 22
Takata, Ryo Tokyo, JP 47 35

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