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:
Feb. 20, 2001
Filed:
Feb. 04, 1999
Hiroki Fukuno, Hyogo-ken, JP;
Yasuoki Tomita, Hyogo-ken, JP;
Shigeyuki Maeda, Hyogo-ken, JP;
Yukihiro Hashimoto, Hyogo-ken, JP;
Kiyoshi Suenaga, Hyogo-ken, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
A cooled moving blade for a gas turbine which has a blade profile capable of more effectively reducing thermal stress in a blade base portion and, thus, preventing cracks from occurring. A moving blade (,) is fixedly secured to a platform (,). On the other hand, a cooling air passage (,) is formed in a serpentine pattern inside of the blade for cooling with cooling air. The moving blade (,) has a base portion of a profile formed by an elliptically curved surface (,) and a rectilinear surface portion (,), wherein the rectilinear surface portion (,) is provided at a hub portion of the blade where thermal stress is large. The cross-sectional area of the blade is increased by providing the rectilinear surface portion (,) The heat capacity is increased, compared with the conventional blade, due to the increased cross-sectional area of the blade. This, in turn, results in a decrease of the temperature difference due to the thermal stress. Thus, the thermal stress can be suppressed more effectively than with the conventional blade.