Patents by Inventor Hidetoshi Kuroki

Hidetoshi Kuroki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9951696
    Abstract: A twin-shaft gas turbine can be used for 50 and 60 Hz power generation without using a reducer. A gas generator includes a compressor that generates compressed air, a burner that burns a fuel mixed with the compressed air received from the compressor so as to generate combustion gas, and a high-pressure turbine that is rotationally driven by the combustion gas received from the burner and generates driving force for the compressor. An output turbine includes a low-pressure turbine that is driven by exhaust gas received from the high-pressure turbine and a power generator that is driven by the low-pressure turbine. A control device reduces opening degree of IGV of the compressor and thereby reduces power of the compressor, and the rotational frequency of the gas generator is increased in a full-speed no-load operating state of the power generator.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: April 24, 2018
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Kenji Nanataki, Hidetaro Murata, Hidetoshi Kuroki
  • Patent number: 9903389
    Abstract: An axial-flow compressor with variable stator vanes located at a single stage can be modified by adding variable stator vanes to the axial-flow compressor so that the variable stator vanes are located at a plurality of stages. The axial-flow compressor includes stator vane rows located at the plurality of stages and include the variable stator vanes extending in a radial direction of the axial-flow compressor and rotating around rotary shafts of the variable stator vanes so as to adjust angles of the variable stator vanes; a plurality of rings are connected to the stator vane rows and drive and rotate the variable stator vanes of the stator vane rows that correspond to respective rings; a plurality of levers that correspond to the plurality of rings; a rotary shaft that holds the plurality of levers so as to enable the levers to pivot.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: February 27, 2018
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Hironori Tsukidate, Hidetoshi Kuroki, Atsushi Sano
  • Patent number: 9810093
    Abstract: Disclosed is a gas turbine and a gas turbine power facility which flexibly accommodate changes in layout of devices and in user's needs. This invention includes an air compressor 1; a turbine 2 coaxially coupled to the compressor 1; a turbine casing 4 accommodating the compressor 1 and the turbine 2; a compressor output shaft 23 for coupling rotary devices including a power generator 200, the compressor output shaft 22 protruding from the turbine casing 4 towards the compressor 1; and a turbine output shaft 23 for coupling the rotary devices, the turbine output shaft 23 protruding from the turbine casing 4 towards the turbine 2.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: November 7, 2017
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Hironori Tsukidate, Hidetoshi Kuroki, Atsushi Sano
  • Patent number: 9617856
    Abstract: An Ni base forged alloy is easy to make hot forging and miniaturization of crystal grains while excellent high-temperature strength and segregation property are compatible. The Ni base forged alloy has solid solution temperature of a precipitation strengthening phase lower than or equal to 970° C., difference in the solid solution temperature between a ?-phase and the precipitation strength phase larger than or equal to 50° C., Al of 0.5 to 1.0%, Cr of 17 to 21%, Fe of 17 to 19%, Nb of 4.5 to 5.5%, Ti of 0.8 to 1.3%, W of 3.0 to 6.0%, B of 0.001 to 0.03%, C of 0.001 to 0.1% and Mo of 1.0% or less in mass percentage [%] and remainder made of Ni and inevitable impurities.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: April 11, 2017
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Takashi Shibayama, Shinya Imano, Hironori Kamoshida, Hidetoshi Kuroki, Jun Sato
  • Patent number: 9534613
    Abstract: It is an object of the present invention to provide a compressor that has a simple structure, produces a damping effect and improves aerodynamic performance. In a compressor including stator blades 4 circumferentially mounted to an inner circumferential surface side of a casing 6 forming a annular path; and an inner barrel 7 supported by the casing and arranged on the radially inside of the stator blade as a partition wall on the radial side of the annular path; the stator blade includes an outer shroud 10 mounted to an inner circumferential surface of the casing at a position facing the inner barrel, and an inner shroud 11 supporting a blade portion at an inner diameter side, the inner shroud being disposed in an annular groove formed in an outer circumferential surface of the inner barrel facing the inner shroud. The stator blade including the outer shroud 10, the inner shroud 11 and the blade portions 9 are formed in a monolithic structure by milling.
    Type: Grant
    Filed: February 15, 2011
    Date of Patent: January 3, 2017
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Atsushi Sano, Hidetoshi Kuroki, Hironori Tsukidate, Hidetaro Murata, Nobuaki Kizuka
  • Publication number: 20140352320
    Abstract: A two-shaft gas turbine is provided that can raise an inlet temperature of a high-pressure turbine and the air quantity of a compressor to respective rated values at any atmospheric temperature without using a variable stator vane in the initial stage of a low-pressure turbine. The two-shaft gas turbine includes a power generator 21 having a compressor 11, a combustor 12 and a high-pressure turbine 13; a low-pressure turbine 14 driven by exhaust gas from the high-pressure turbine 13; a generator motor 23 connected to the gas generator 21; and a control unit 24. When either one of a value of the inlet temperature of the high-pressure turbine 13 and a value of the air quantity of the compressor 11 reaches a rated value before the other value reaches a rated value, the control unit 24 drives the generator motor 23 to bring the other value close to the rated value.
    Type: Application
    Filed: May 27, 2014
    Publication date: December 4, 2014
    Applicant: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Kenji NANATAKI, Hidetoshi KUROKI
  • Patent number: 8864906
    Abstract: A method for producing a silicon wafer in which occurrence of slip starting from interstitial-type point defects is prevented in a part from the shoulder to the top of the straight cylinder portion of a silicon single crystal when the silicon single crystal is grown by pulling method under growth conditions entering an I-rich region. In order to prevent occurrence of slip in the range from the shoulder (10A) to the top of the straight cylinder portion (10B), the silicon single crystal (10) is pulled under conditions that the oxygen concentration Oi from the shoulder (10A) to the top of the straight cylinder portion (10B) of the silicon single crystal (10) is not lower than a predetermined concentration for preventing slip starting from interstitial-type point defects, more specifically not lower than 9.0×1017 atoms/cm3.
    Type: Grant
    Filed: March 20, 2006
    Date of Patent: October 21, 2014
    Assignee: Sumco Techxiv Kabushiki Kaisha
    Inventors: Hidetoshi Kuroki, Motoaki Yoshinaga, Yutaka Shiraishi, Masahiro Shibata
  • Publication number: 20140064981
    Abstract: An Ni base forged alloy is easy to make hot forging and miniaturization of crystal grains while excellent high-temperature strength and segregation property are compatible. The Ni base forged alloy has solid solution temperature of a precipitation strengthening phase lower than or equal to 970° C., difference in the solid solution temperature between a ?-phase and the precipitation strength phase larger than or equal to 50° C., Al of 0.5 to 1.0%, Cr of 17 to 21%, Fe of 17 to 19%, Nb of 4.5 to 5.5%, Ti of 0.8 to 1.3%, W of 3.0 to 6.0%, B of 0.001 to 0.03%, C of 0.001 to 0.1% and Mo of 1.0% or less in mass percentage [%] and remainder made of Ni and inevitable impurities.
    Type: Application
    Filed: August 20, 2013
    Publication date: March 6, 2014
    Applicant: Hitachi, Ltd.
    Inventors: Takashi SHIBAYAMA, Shinya IMANO, Hironori KAMOSHIDA, Hidetoshi KUROKI, Jun SATO
  • Publication number: 20130259656
    Abstract: Disclosed is a gas turbine and a gas turbine power facility which flexibly accommodate changes in layout of devices and in user's needs. This invention includes an air compressor 1; a turbine 2 coaxially coupled to the compressor 1; a turbine casing 4 accommodating the compressor 1 and the turbine 2; a compressor output shaft 23 for coupling rotary devices including a power generator 200, the compressor output shaft 22 protruding from the turbine casing 4 towards the compressor 1; and a turbine output shaft 23 for coupling the rotary devices, the turbine output shaft 23 protruding from the turbine casing 4 towards the turbine 2.
    Type: Application
    Filed: February 15, 2013
    Publication date: October 3, 2013
    Applicant: Hitachi, Ltd.
    Inventors: Hironori TSUKIDATE, Hidetoshi KUROKI, Atsushi SANO
  • Patent number: 8419365
    Abstract: Provided is a member having an internal cooling passage 7c formed therein and having opposed partition walls 6b, 6c between which a medium flows to cool a parent material, including a first heat transfer rib 25a which extends from almost the center between the opposed partition walls 6b, 6c to one partition wall 6c and slants in a downstream direction of the medium, and a second heat transfer rib 25b which extends from almost the center between the opposed partition walls 6b, 6c to the other partition wall 6b and slants in the downstream direction of the medium, wherein a slit 70a or 70b which passes through between an upstream side of the cooling passage 7c and a downstream side thereof is formed in the first heat transfer rib 70a or the second heat transfer rib 70b.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: April 16, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Nobuaki Kizuka, Yasuhiro Horiuchi, Shinya Marushima, Hidetoshi Kuroki
  • Publication number: 20130084162
    Abstract: A gas turbine is provided that can suppress an increase in the supplied amount of cooling air in clearance adjustment through casing cooling. The gas turbine 101 includes a turbine casing 19 enclosing a turbine shaft 105, the turbine casing 19 including a cooling air header 21 and a cooling passage 24; and an exhaust diffuser 113 connected to the exhaust side of the casing 19, the exhaust diffuser 113 including an exhaust diffuser cooling passage 26. A plate 22 formed with a plurality of impingement cooling holes 28 is installed inside the cooling air header, and a route is formed which allows cooling air introduced from the impingement cooling holes to flow from the casing cooling passage to the diffuser cooling passage.
    Type: Application
    Filed: September 6, 2012
    Publication date: April 4, 2013
    Applicant: Hitachi, Ltd.
    Inventors: Atsushi SANO, Hidetoshi Kuroki, Hironori Tsukidate, Hidetaro Murata, Hayato Maekawa
  • Publication number: 20130064670
    Abstract: An airfoil profile is formed such that a passage width ratio, represented in a dimensionless manner, of an inter-blade passage width of vane root cross-section to an outlet throat width substantially monotonously decreases from a blade inlet toward a blade outlet. The blade has a blade airfoil profile shape in an envelope within a range of ±2.0 mm in a direction normal to any surface location of an airfoil profile portion. The airfoil profile portion has a reference airfoil contour represented in Cartesian coordinates, wherein Z is a distance representing a sectional height from a root of the airfoil profile portion. The contours represented by X and Y at each section Z are joined smoothly with one another in a blade height direction to form a complete shape of the airfoil profile portion.
    Type: Application
    Filed: August 31, 2012
    Publication date: March 14, 2013
    Inventors: Nobuaki KIZUKA, Hidetaro MURATA, Hidetoshi KUROKI, Kenji NANATAKI
  • Patent number: 8277192
    Abstract: An airfoil profile is formed such that a passage width ratio, represented in a dimensionless manner, of an inter-blade passage width of vane root cross-section to an outlet throat width substantially monotonously decreases from a blade inlet toward a blade outlet. The blade has a blade airfoil profile shape in an envelope within a range of .+?.2.0 mm in a direction normal to any surface location of an airfoil profile portion. The airfoil profile portion has a reference airfoil contour represented in Cartesian coordinates wherein Z is a distance representing a sectional height from a root of the airfoil profile portion. The contours represented by X and Y at each section Z are joined smoothly with one another in a blade height direction to form a complete shape of the airfoil profile portion.
    Type: Grant
    Filed: January 23, 2008
    Date of Patent: October 2, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Nobuaki Kizuka, Hidetaro Murata, Hidetoshi Kuroki, Kenji Nanataki
  • Publication number: 20120230813
    Abstract: An axial-flow compressor with variable stator vanes located at a single stage can be modified by adding variable stator vanes to the axial-flow compressor so that the variable stator vanes are located at a plurality of stages. The axial-flow compressor includes stator vane rows located at the plurality of stages and include the variable stator vanes extending in a radial direction of the axial-flow compressor and rotating around rotary shafts of the variable stator vanes so as to adjust angles of the variable stator vanes; a plurality of rings are connected to the stator vane rows and drive and rotate the variable stator vanes of the stator vane rows that correspond to respective rings; a plurality of levers that correspond to the plurality of rings; a rotary shaft that holds the plurality of levers so as to enable the levers to pivot.
    Type: Application
    Filed: February 7, 2012
    Publication date: September 13, 2012
    Applicant: Hitachi, Ltd.
    Inventors: Hironori Tsukidate, Hidetoshi Kuroki, Atsushi Sano
  • Publication number: 20120107103
    Abstract: A gas turbine shroud includes a ceramic abradable coating superior in abradable property and durability. The gas turbine ceramic abradable coating of the present invention is configured by an abradable metal layer and a porous ceramic abradable layer (hardness RC15Y: 80±3), the porous ceramic abradable layer is provided with slit grooves by machining work, and a slit groove width is 0.5 to 5 mm. Thereby, the abradable property, and durability against a thermal cycle and high-temperature oxidation are improved.
    Type: Application
    Filed: September 23, 2011
    Publication date: May 3, 2012
    Inventors: Yoshitaka Kojima, Hideyuki Arikawa, Akira Mebata, Tadashi Kasuya, Hiroyuki Doi, Kunihiro Ichikawa, Takao Endo, Kazuto Mikazuki, Hidetoshi Kuroki
  • Publication number: 20110236195
    Abstract: It is an object of the present invention to provide a compressor that has a simple structure, produces a damping effect and improves aerodynamic performance. In a compressor including stator blades 4 circumferentially mounted to an inner circumferential surface side of a casing 6 forming a annular path; and an inner barrel 7 supported by the casing and arranged on the radially inside of the stator blade as a partition wall on the radial side of the annular path; the stator blade includes an outer shroud 10 mounted to an inner circumferential surface of the casing at a position facing the inner barrel, and an inner shroud 11 supporting a blade portion at an inner diameter side, the inner shroud being disposed in an annular groove formed in an outer circumferential surface of the inner barrel facing the inner shroud. The stator blade including the outer shroud 10, the inner shroud 11 and the blade portions 9 are formed in a monolithic structure by milling.
    Type: Application
    Filed: February 15, 2011
    Publication date: September 29, 2011
    Applicant: Hitachi, Ltd.
    Inventors: Atsushi SANO, Hidetoshi Kuroki, Hironori Tsukidate, Hidetaro Murata, Nobuaki Kizuka
  • Publication number: 20110200449
    Abstract: Provided is a member having an internal cooling passage 7c formed therein and having opposed partition walls 6b, 6c between which a medium flows to cool a parent material, including a first heat transfer rib 25a which extends from almost the center between the opposed partition walls 6b, 6c to one partition wall 6c and slants in a downstream direction of the medium, and a second heat transfer rib 25b which extends from almost the center between the opposed partition walls 6b, 6c to the other partition wall 6b and slants in the downstream direction of the medium, wherein a slit 70a or 70b which passes through between an upstream side of the cooling passage 7c and a downstream side thereof is formed in the first heat transfer rib 70a or the second heat transfer rib 70b.
    Type: Application
    Filed: April 25, 2011
    Publication date: August 18, 2011
    Applicant: HITACHI, LTD.
    Inventors: Nobuaki Kizuka, Yasuhiro HORIUCHI, Shinya MARUSHIMA, Hidetoshi Kuroki
  • Patent number: 7980818
    Abstract: Provided is a member having an internal cooling passage 7c formed therein and having opposed partition walls 6b, 6c between which a medium flows to cool a parent material, including a first heat transfer rib 25a which extends from almost the center between the opposed partition walls 6b, 6c to one partition wall 6c and slants in a downstream direction of the medium, and a second heat transfer rib 25b which extends from almost the center between the opposed partition walls 6b, 6c to the other partition wall 6b and slants in the downstream direction of the medium, wherein a slit 70a or 70b which passes through between an upstream side of the cooling passage 7c and a downstream side thereof is formed in the first heat transfer rib 70a or the second heat transfer rib 70b.
    Type: Grant
    Filed: April 3, 2006
    Date of Patent: July 19, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Nobuaki Kizuka, Yasuhiro Horiuchi, Shinya Marushima, Hidetoshi Kuroki
  • Publication number: 20090301385
    Abstract: A method for producing a silicon wafer in which occurrence of slip starting from interstitial-type point defects is prevented in a part from the shoulder to the top of the straight cylinder portion of a silicon single crystal when the silicon single crystal is grown by pulling method under growth conditions entering an I-rich region. In order to prevent occurrence of slip in the range from the shoulder (10A) to the top of the straight cylinder portion (10B), the silicon single crystal (10) is pulled under conditions that the oxygen concentration Oi from the shoulder (10A) to the top of the straight cylinder portion (10B) of the silicon single crystal (10) is not lower than a predetermined concentration for preventing slip starting from interstitial-type point defects, more specifically not lower than 9.0×1017 atoms/cm3.
    Type: Application
    Filed: March 20, 2006
    Publication date: December 10, 2009
    Applicant: SUMCO TECHXIV KABUSHIKI KAISHA
    Inventors: Hidetoshi Kuroki, Motoaki Yoshinaga, Yutaka Shiraishi, Masahiro Shibata
  • Patent number: D653218
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: January 31, 2012
    Assignee: SMC Corporation
    Inventors: Yoshihiro Fukano, Hidetoshi Kuroki