The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 2015
Filed:
Oct. 14, 2008
Atsuya Hirano, Hitachinaka, JP;
Akira Nishimizu, Tokai, JP;
Takeshi Kudo, Hitachinaka, JP;
Mitsubishi Hitachi Power Systems, Ltd., Kanagawa, JP;
Abstract
In a defect detection device for a turbine rotor blade, a recess is provided in a side surface of a web provided to the inner circumferential side of a stationary blade diaphragm where stationary blades are annularly arranged adjacent to turbine rotor blades. An eddy current probe is movably installed in the recess, and a rod provided with a signal line for transmitting a signal detected by the eddy current probe, connected to the eddy current prove, is set up to be movable through a hole in a turbine casing and an air gap formed in the stationary blade diaphragm. The eddy current probe is moved toward or away from the turbine rotor blade implanting portion, and a data analyzer determines the condition of a defect occurred in the turbine rotor blade implanting portion based on the signals detected by the eddy current probe.