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. 12, 2015
Filed:
May. 30, 2012
Kunio Asai, Hitachi, JP;
Keiko Shishime, Hitachinaka, JP;
Yasuyoshi Harashima, Hitachi, JP;
Takeshi Kashiwagi, Iwaki, JP;
Hideyuki Nomura, Hitachi, JP;
Takafumi Wakasa, Hitachinaka, JP;
Masayoshi Ohhira, Hitachi, JP;
Kunio Asai, Hitachi, JP;
Keiko Shishime, Hitachinaka, JP;
Yasuyoshi Harashima, Hitachi, JP;
Takeshi Kashiwagi, Iwaki, JP;
Hideyuki Nomura, Hitachi, JP;
Takafumi Wakasa, Hitachinaka, JP;
Masayoshi Ohhira, Hitachi, JP;
Mitsubishi Hitachi Power Systems, Ltd., Kanagawa, JP;
Abstract
A steam turbine having a fork-type joint structure is provided that secures sufficient strength for endurance of stress corrosion cracking, low-cycle fatigue, and high-cycle fatigue, and extends an operating life while making it possible to endure long-term operation. The turbine includes a rotor having a plurality of rotor forks rowed in an axial direction; a turbine blade having blade forks arranged in the axial direction of the rotor, the blade forks engaged with the rotor forks; a plurality of pin holes whose positions are different from each other in the radial direction of the rotor; and a plurality of fork pins inserted into the plurality of pin holes in the axial direction of the rotor. A clearance exists between an inner diameter of the pin hole of the blade fork and a diameter of the fork pin, the clearance varying depending on positions in the axial direction of the turbine.