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:
Jul. 18, 2000
Filed:
Oct. 28, 1998
Hiroki Fukuno, Takasago, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
A gas turbine second stage stationary blade has cooling air passages of an inner shroud provided with enhanced cooling efficiency. In inner shroud 126, there are provided a leading edge passage 42 and trailing edge passage 44, both extending from blade portion and mutually separated by a rib 40, and impingement plates 83, 84 having a multiplicity of small holes 101. An opening portion 68 between the blade portion and the inner shroud 126 is closed by a bottom plate 150 and, together with a recess portion 100 at a bottom portion of the leading edge passage 42, connects to a passage 188 of a leading edge portion 41 via a passage 90'. Air from the trailing edge passage 44 flows into cavity 45 to be injected through the small holes 101 of the impingement plates 83, 84 for cooling of the central portion of the inner shroud 126 and is then discharged as air 60 through passages 92 of the trailing edge portion 43. The entire amount of air from the leading edge passage 42 enters the passage 188 is then enhanced in heat transfer effect by turbulators 200, further flows separately into passages 93, 94 of side edge portions for cooling therearound, and is then discharged as air 61. The air amount in the leading edge portion 41 and the side edge portions is increased and the cooling effect is enhanced.