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:
May. 23, 2006
Filed:
Aug. 29, 2002
Junichi Tominaga, Kanagawa, JP;
Sakae Kawasaki, Kanagawa, JP;
Tadashi Tanuma, Kanagawa, JP;
Kenichi Imai, Kanagawa, JP;
Junichi Tominaga, Kanagawa, JP;
Sakae Kawasaki, Kanagawa, JP;
Tadashi Tanuma, Kanagawa, JP;
Kenichi Imai, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In the axial turbine according to the present invention, a nozzle bladeand/or a movable bladehas a profile in which a throat-pitch ratio 's/t' is maximized at a blade-central portion in height, wherein 's' being a shortest distance between a rear edge of a nozzle blade (movable blade) and a back side of another nozzle blade that is adjacent to the nozzle blade, and “t” being a pitch of the nozzle blades disposed in the row, minimized in a position between the blade-central portion in height and a blade-root portion and increased from a minimized value to the blade-root portion. This structure enables to provide the axial turbine, which permits to control flow distribution of the working fluid in the height direction of the blade in the passage between the blades of a turbine nozzle unit and a turbine movable nozzle and reduce the blade profile loss and the secondary flow loss at the blade-root portion, thus making a further improvement in the turbine stage efficiency.