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:
Oct. 29, 2013
Filed:
Jun. 23, 2010
Xiaoqing Zheng, Niskayuna, NY (US);
Bernard Arthur Couture, Jr., Schenectady, NY (US);
Casey William Jones, Malta, NY (US);
Binayak Roy, Gulderland, NY (US);
Xiaoqing Zheng, Niskayuna, NY (US);
Bernard Arthur Couture, Jr., Schenectady, NY (US);
Casey William Jones, Malta, NY (US);
Binayak Roy, Gulderland, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
A system controls net thrust of a steam turbine having a stepped rotating shaft. A first leak off line fluidly couples a first stage of a turbine section to a packing near a stepped portion on the rotating shaft. A second leak off line fluidly couples a second stage of the turbine section that has a pressure different from the first stage to a step area immediately adjacent to the stepped portion, and a connection line fluidly couples the first leak off line to the second leak off line. The lines include control valves such that a controller can actively control the net thrust by regulating thrust pressure on the stepped portion using steam from the first and second stages of the turbine section. The controller may also prevent damage to an active retractable seal using the control valves.