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:
Sep. 14, 2004
Filed:
Dec. 23, 2002
Morikazu Kitazawa, Yokohama, JP;
Masataka Kikuchi, Chigasaki, JP;
Kazuo Aoyagi, Tokyo-To, JP;
Nobuo Okita, Ushiku, JP;
Hiroyuki Oohira, Tokyo-To, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
The present invention solves problems of securing high-temperature strength at elevated temperatures and of preventing steam leakage that arise when high-pressure, high-temperature steam is used for driving a steam turbine, and problems of preventing the occurrence of rubbing due to the suppression of the excessive elongation difference and of minimizing steam leakage from shaft seals. A double-wall casing structure is arranged at an area corresponding to stages from a high-pressure first stage ( ) to a predetermined high-pressure stage arranged on an upstream side of a high-pressure final stage ( ); and a single-wall casing structure is arranged at an area corresponding to stages which follows said predetermined high-pressure stage.