Patents by Inventor Eisaku Ito

Eisaku Ito 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: 10526979
    Abstract: A gas turbine provided with an air bleeder tube (1) that, during startup, bleeds a portion of the compressed air of a compressor from the compressor and discharged the bled air into a cylindrical exhaust duct (20), wherein the air bleeder tube (1) is disposed at a portion that does not obstruct the flow of the main flow of combustion gas.
    Type: Grant
    Filed: April 5, 2017
    Date of Patent: January 7, 2020
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Yasuro Sakamoto, Eisaku Ito, Susumu Wakazono, Koichi Ishizaka, Yukinori Machida
  • Publication number: 20190234223
    Abstract: An axial flow rotating machine has: a rotor with a plurality of rotor blades; a stator with a plurality of stator blades; an axial flow rotating portion defined by the rotor and the stator; and a diffuser connected to the axial flow rotating portion on a downstream side of the axial flow rotating portion. A final blade portion inner-circumferential inner wall, which is a portion of an inner-circumferential inner wall of the axial flow rotating portion, is defined such that a diameter thereof at a trailing edge position of a final blade is smaller than the diameter at a leading edge position of the final blade. In addition, a diameter of all or a portion of a diffuser inner-circumferential inner wall decreases in a direction of the downstream side in an axial direction.
    Type: Application
    Filed: April 10, 2019
    Publication date: August 1, 2019
    Inventors: Kazuya NISHIMURA, Eisaku ITO, Koichiro IIDA, Kentaro AKIMOTO
  • Patent number: 10107501
    Abstract: An object is to realize combustion flame which can further reduce the amount of NOx generation. A combustor (14) includes a pilot nozzle (40); a plurality of main nozzles (44) arranged apart from the pilot nozzle (40) in the circumferential direction on the outer peripheral side of the pilot nozzle (40) and configured to perform premix combustion; a combustor basket (34) surrounding the pilot nozzle (40) and each main nozzle (44); an outlet outer ring (50) provided at a tip end of the combustor basket (34); and a combustion liner (36) fitted, at an inner surface thereof, onto the outer periphery of the combustor basket (34) and surrounding the outlet outer ring (50). The outlet outer ring (50) is formed parallel to an inner wall surface (66) of the combustion liner (36).
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: October 23, 2018
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Satoshi Takiguchi, Mitsunori Isono, Atsushi Yuasa, Eisaku Ito, Shigemi Mandai
  • Patent number: 9989450
    Abstract: An erosion test apparatus includes a combustor configured to obtain a combustion gas by mixing and combusting compressed air and a fuel, and an erodent supply unit configured to supply an erodent to the combustion gas. The erosion test apparatus further includes an accommodation support unit configured to accommodate and support a test piece having a front surface coated through thermal barrier coating, and an accelerator configured to accelerate the combustion gas including the erodent to collide with the test piece.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: June 5, 2018
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Daisuke Kudo, Taiji Torigoe, Junichiro Masada, Koji Takahashi, Yoshitaka Uemura, Yoshifumi Okajima, Naotoshi Okaya, Eisaku Ito, Masahiko Mega, Shigenari Horie, Shuji Tanigawa, Yasuhiko Tsuru, Keizo Tsukagoshi, Masamitsu Kuwabara
  • Publication number: 20180045080
    Abstract: An intake air cooling device includes a water supply line and a heat pump device. The water supply line sends water to a waste heat recovery boiler which generates steam using heat of an exhaust gas from a gas turbine. The heat pump device transfers heat of air suctioned by the gas turbine to water flowing through the water supply line and thereby cools the air while heating the water.
    Type: Application
    Filed: March 10, 2016
    Publication date: February 15, 2018
    Applicant: Mitsubishi Heavy Industries, Ltd.
    Inventors: Hideyuki UECHI, Eisaku ITO, Hideaki SUGISHITA, Naoki HISADA
  • Patent number: 9845689
    Abstract: In a turbine exhaust structure and a gas turbine, a turbine casing (26) formed in an annular shape to constitute a combustion gas passage A is provided. An exhaust diffuser (31) formed in an annular shape to constitute a flue gas passage (B) is connected to the turbine casing (26) to constitute a configuration. By providing a pressure loss body (61) in the exhaust diffuser (31), efficient pressure recovery can be carried out, which improves turbine efficiency, thereby enabling improvement of the performance.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: December 19, 2017
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Hitoshi Kitagawa, Yasuro Sakamoto, Eisaku Ito
  • Patent number: 9732674
    Abstract: A flow path structure includes a wall surface in which a flow path is formed, a structure configured to extend in a direction intersecting a main stream direction of a fluid flowing through the flow path from the wall surface, and a concave section forming region formed throughout a range including the structure in the main stream direction and having a concave section formed in the wall surface. As the structure occupies a partial range of the flow path in the flow path cross section intersecting the main stream, a cross-sectional area of the flow path is varied in accordance with positional variation in the main stream direction.
    Type: Grant
    Filed: December 24, 2010
    Date of Patent: August 15, 2017
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Yasuro Sakamoto, Eisaku Ito, Susumu Wakazono
  • Publication number: 20170226866
    Abstract: A turbine rotor blade (26) for a turbine includes an airfoil portion (30) having an airfoil formed by a pressure surface (31) and a suction surface (32); and at least one squealer rib (40, 42, 44) disposed on a tip surface (35) of the turbine rotor blade so as to extend from a leading-edge side (33) toward a trailing-edge side (34). At least one (42) of the at least one squealer rib has a ridge (43) extending in an extending direction of the squealer rib. A clearance (100) between the tip surface and an inner wall surface of a casing of the turbine, the inner wall surface facing the tip surface, has a local minimum value on the ridge. The clearance is greater than the local minimum value at both sides of the ridge in a width direction of the squealer rib.
    Type: Application
    Filed: October 20, 2015
    Publication date: August 10, 2017
    Inventors: Kazuya NISHIMURA, Daigo FUJIMURA, Eisaku ITO, Koichi ISHIZAKA
  • Publication number: 20170226620
    Abstract: A heat shielding coating (11) includes a bond coat layer (12) as a metal coupling layer laminated on a base material (10), and a top coat layer (13) which is laminated on the bond coat layer (12) and includes zirconia-based ceramic, in which the top coat layer (13) has a porosity of 9% or less.
    Type: Application
    Filed: November 10, 2015
    Publication date: August 10, 2017
    Applicant: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Daisuke KUDO, Taiji TORIGOE, Junichiro MASADA, Koji TAKAHASHI, Yoshitaka UEMURA, Yoshifumi OKAJIMA, Naotoshi OKAYA, Eisaku ITO, Masahiko MEGA, Shigenari HORIE, Shuji TANIGAWA, Yasuhiko TSURU, Keizo TSUKAGOSHI, Masamitsu KUWABARA
  • Patent number: 9719354
    Abstract: A gas turbine burns the air compressed in a compressor with supplying fuel in a combustor so as to obtain rotary power by supplying the generated combustion gas to a turbine. The turbine includes turbine vane elements and turbine blade elements that are alternately positioned in a direction in which the combustion gas fluidizes in a turbine cylinder having a cylindrical shape, and a flue gas diffuser having a cylindrical shape and connected to a rear portion of the turbine cylinder. The turbine blade element includes a plurality of turbine blades positioned at equal intervals in the circumference direction. The turbine blades have a throat width on a longitudinal end side made larger than a throat width on a longitudinally intermediate portion side. This efficiently restores the pressure of the flue gas. This improves the efficiency of the turbine so that the performance can be improved.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: August 1, 2017
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Hitoshi Kitagawa, Yasuro Sakamoto, Eisaku Ito
  • Publication number: 20170204788
    Abstract: A gas turbine provided with an air bleeder tube (1) that, during startup, bleeds a portion of the compressed air of a compressor from the compressor and discharged the bled air into a cylindrical exhaust duct (20), wherein the air bleeder tube (1) is disposed at a portion that does not obstruct the flow of the main flow of combustion gas.
    Type: Application
    Filed: April 5, 2017
    Publication date: July 20, 2017
    Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Yasuro Sakamoto, Eisaku Ito, Susumu Wakazono, Koichi Ishizaka, Yukinori Machida
  • Patent number: 9689272
    Abstract: A gas turbine includes a turbine blade, a turbine vane, a ring segment circumferentially surrounding the turbine blade, an outer shroud circumferentially surrounding the turbine vane, and a combustion gas flow-path provided in the ring segment and the outer shroud. The outer shroud is positioned on an upstream side of the ring segment in a gas flow direction of the combustion gas. Seal gas, of which temperature is lower than that of the combustion gas, is fed between the ring segment- and the outer shroud into the combustion gas flow-path. The outer shroud has a guide surface that is provided on an inner circumference thereof on a downstream side of the gas flow direction. The guide surface is formed such that a flow passage area of the combustion gas flow-path is gradually increased.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: June 27, 2017
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Yasuro Sakamoto, Eisaku Ito
  • Patent number: 9650966
    Abstract: A gas turbine provided with an air bleeder tube (1) that, during startup, bleeds a portion of the compressed air of a compressor from the compressor and discharged the bled air into a cylindrical exhaust duct (20), wherein the air bleeder tube (1) is disposed at a portion that does not obstruct the flow of the main flow of combustion gas.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: May 16, 2017
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Yasuro Sakamoto, Eisaku Ito, Susumu Wakazono, Koichi Ishizaka, Yukinori Machida
  • Patent number: 9567873
    Abstract: In a disc axis adjusting mechanism in a gas turbine, the gas turbine has an exhaust gas diffuser provided between a casing wall and a bearing case which are connected to a downstream side of a turbine, a plurality of struts provided at intervals in a circumferential direction, and strut covers coupling an outer diffuser and an inner diffuser of the exhaust gas diffuser so as to cover the struts, and the mechanism comprises: a plurality of air introduction holes formed in the casing wall so as to allow the interior and exterior of the wall to communicate with each other; a sensor unit configured to detect a parameter corresponding to the thermal elongation of each of the struts; and a flow rate adjustor configured to adjust the flow rate of air flowing through each of the air introduction holes based on a detection value detected by the sensor unit.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: February 14, 2017
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Motoharu Ueda, Eigo Katou, Eisaku Ito
  • Publication number: 20160273776
    Abstract: An object is to realize combustion flame which can further reduce the amount of NOx generation. A combustor (14) includes a pilot nozzle (40); a plurality of main nozzles (44) arranged apart from the pilot nozzle (40) in the circumferential direction on the outer peripheral side of the pilot nozzle (40) and configured to perform premix combustion; a combustor basket (34) surrounding the pilot nozzle (40) and each main nozzle (44); an outlet outer ring (50) provided at a tip end of the combustor basket (34); and a combustion liner (36) fitted, at an inner surface thereof, onto the outer periphery of the combustor basket (34) and surrounding the outlet outer ring (50). The outlet outer ring (50) is formed parallel to an inner wall surface (66) of the combustion liner (36).
    Type: Application
    Filed: March 19, 2014
    Publication date: September 22, 2016
    Inventors: Satoshi TAKIGUCHI, Mitsunori ISONO, Atsushi YUASA, Eisaku ITO, Shigemi MANDAI
  • Patent number: 9395085
    Abstract: In a communicating structure between combustors that generates combustion gas inside pipe pieces and a turbine portion that generates a rotational driving force by making the combustion gas sequentially pass through a turbine stage formed of turbine stator vanes and turbine rotor blades, at least some of the first-stage turbine stator vanes closest to the combustor among the turbine stator vanes are disposed downstream of sidewalls of one pipe piece and another pipe piece that are adjacent to each other, and the distance from leading edges of the first-stage turbine stator vanes disposed downstream of the sidewalls of the pipe pieces to end portions of the sidewalls closer to the turbine portion is equal to or less than a spacing between an internal surface of the sidewall of the one pipe piece and an internal surface of the sidewall of the other pipe piece.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: July 19, 2016
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Rosic Budmir, Yasuro Sakamoto, Sumiu Uchida, Eisaku Ito, Tsuyoshi Kitamura, Satoshi Hada, Sosuke Nakamura
  • Publication number: 20160131570
    Abstract: An erosion test apparatus includes a combustor configured to obtain a combustion gas by mixing and combusting compressed air and a fuel, and an erodent supply unit configured to supply an erodent to the combustion gas. The erosion test apparatus further includes an accommodation support unit configured to accommodate and support a test piece having a front surface coated through thermal barrier coating, and an accelerator configured to accelerate the combustion gas including the erodent to collide with the test piece.
    Type: Application
    Filed: November 5, 2015
    Publication date: May 12, 2016
    Inventors: Daisuke KUDO, Taiji TORIGOE, Junichiro MASADA, Koji TAKAHASHI, Yoshitaka UEMURA, Yoshifumi OKAJIMA, Naotoshi OKAYA, Eisaku ITO, Masahiko MEGA, Shigenari HORIE, Shuji TANIGAWA, Yasuhiko TSURU, Keizo TSUKAGOSHI, Masamitsu KUWABARA
  • Publication number: 20160017734
    Abstract: An axial flow rotating machine having: a rotor that is provided with a plurality of rotor blades; a stator provided with a plurality of stator blades; an axial flow rotating portion formed by the rotor and the stator; and a diffuser connected to the axial flow rotating portion on the downstream side of the axial flow rotating portion. The final blade portion inner-circumferential inner wall, which is a portion of the inner-circumferential inner wall of the axial flow rotating portion, is formed so that the diameter thereof at the trailing edge position of the final blade is smaller than the diameter at the leading edge position of the final blade. In addition, the diameter of all or a portion of the diffuser inner-circumferential inner wall decreases in a direction of a first side in the axial direction, the first side being the downstream side.
    Type: Application
    Filed: March 20, 2014
    Publication date: January 21, 2016
    Inventors: Kazuya NISHIMURA, Eisaku ITO, Koichiro IIDA, Kentaro AKIMOTO
  • Patent number: 9091170
    Abstract: A one-stage stator vane cooling structure consisting of: a plurality of linking members that are provided between a plurality of combustors disposed in the circumferential direction of a gas turbine; and cooling holes that are provided in each of the one-stage stator vanes to discharge a cooling gas from the inside to the outside of the one-stage stator vanes in order to cool the one-stage stator vanes on the periphery of the stagnation line of the combustion gas flowing in from the plurality of combustors; in which the cooling holes are formed at positions that are determined according to the relative positions of the one-stage stator vanes and the linking members disposed near the one-stage stator vanes.
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: July 28, 2015
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Yasuro Sakamoto, Eisaku Ito
  • Publication number: 20150078887
    Abstract: In a disc axis adjusting mechanism in a gas turbine, the gas turbine has an exhaust gas diffuser provided between a casing wall and a bearing case which are connected to a downstream side of a turbine, a plurality of struts provided at intervals in a circumferential direction, and strut covers coupling an outer diffuser and an inner diffuser of the exhaust gas diffuser so as to cover the struts, and the mechanism comprises: a plurality of air introduction holes formed in the casing wall so as to allow the interior and exterior of the wall to communicate with each other; a sensor unit configured to detect a parameter corresponding to the thermal elongation of each of the struts; and a flow rate adjustor configured to adjust the flow rate of air flowing through each of the air introduction holes based on a detection value detected by the sensor unit.
    Type: Application
    Filed: February 8, 2013
    Publication date: March 19, 2015
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Motoharu Ueda, Eigo Katou, Eisaku Ito