Patents by Inventor Soichiro TABATA

Soichiro TABATA 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: 11840938
    Abstract: A steam turbine stator vane includes a vane body portion which has a vane surface including a pressure surface and a suction surface, a moisture removal channel disposed in the vane body portion, at least one slit opening to the vane surface to communicate with the moisture removal channel and extending along a height direction from a base end portion toward a tip end portion of the vane body portion, and at least one groove portion disposed in the vane surface and extending from the base end portion along the height direction, at least a part of the at least one groove portion overlapping the at least one slit along the height direction.
    Type: Grant
    Filed: May 1, 2020
    Date of Patent: December 12, 2023
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Ryo Takata, Yasuhiro Sasao, Naoto Tochitani, Soichiro Tabata
  • Publication number: 20230392510
    Abstract: A turbine stator vane comprising: a stator vane body extending in a radial direction intersecting the flow direction of steam; a recovery portion that is formed on the surface of the stator vane body, and recovers a liquid film flowing along the surface; and a center region, which is formed on the surface of the stator vane body and in which a plurality of first fine grooves extending from the upstream side toward the recovery portion in the flow direction are formed, wherein the interval between adjacent first fine grooves narrows from the upstream side toward the recovery portion.
    Type: Application
    Filed: March 30, 2022
    Publication date: December 7, 2023
    Inventors: Shunsuke MIZUMI, Soichiro TABATA, Koji ISHIBASHI, Satoshi MIYAKE
  • Patent number: 11821331
    Abstract: This steam turbine comprises: a rotating shaft that extends along an axis; a plurality of rotor blades that are arranged in the circumferential direction and that extend in a radial direction from the outer circumferential surface of the rotating shaft; a casing body that covers the rotating shaft and the rotor blades from the outer circumference side; and a plurality of stationary blades that extend in the radial direction from a position on the inner circumferential surface of the casing body on the upstream side of the rotor blades and that are arranged in the circumferential direction. A plurality of microgrooves that extend in the steam flow direction are formed on the surface of the rotor blades and/or the stationary blades.
    Type: Grant
    Filed: September 6, 2022
    Date of Patent: November 21, 2023
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Shigeki Senoo, Soichiro Tabata
  • Publication number: 20230323780
    Abstract: A steam turbine including a rotor shaft, a plurality of moving blade rows, a casing, and fixed blade rows disposed on a first side in the axial direction, relative to each of the plurality of moving blade rows. The last fixed blade row, disposed furthest on a second side in the axial direction among the plurality of moving blade rows, includes a plurality of fixed blades disposed at intervals in the circumferential direction and each extending in the radial direction; an outside ring having an annular shape and being disposed on the outside, in the radial direction, of the plurality of fixed blades; and an inside ring having an annular shape and being disposed on the inside, in the radial direction, of the plurality of fixed blades.
    Type: Application
    Filed: September 28, 2020
    Publication date: October 12, 2023
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Ryo Takata, Soichiro Tabata, Yasuhiro Sasao
  • Patent number: 11773753
    Abstract: This turbine stator vane extends in the radial direction which intersects the flow direction of steam, and includes a pressure surface facing the upstream side in the flow direction, and a suction surface facing the downstream side in the flow direction. A plurality of grooves are formed in at least the pressure surface, the grooves extending outward in the radial direction toward the downstream side. At the periphery of the grooves in the pressure surface, formed is a hydrophilic uneven region having greater hydrophilic properties than the pressure surface. The downstream-side ends of the plurality of grooves are connected to slits for capturing a liquified component of the steam.
    Type: Grant
    Filed: December 11, 2020
    Date of Patent: October 3, 2023
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Shunsuke Mizumi, Soichiro Tabata, Chongfei Duan, Koji Ishibashi
  • Patent number: 11753940
    Abstract: Provided is a steam turbine rotor blade having, at an intermediate position in a blade length direction thereof, a tie boss for connection to an adjacent blade, wherein the steam turbine rotor blade includes a leading edge side protrusion that is extending in an embankment shape in a blade chord length direction at an intermediate position in the blade length direction, a start end and a terminal end of the leading edge side protrusion are located on a suction side surface and a pressure side surface, respectively, and the leading edge side protrusion continues from the start end to the terminal end via a blade leading edge and arrangement thereof in the blade length direction overlaps with the tie boss as viewed from the upstream side.
    Type: Grant
    Filed: November 19, 2021
    Date of Patent: September 12, 2023
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Yasuhiro Sasao, Soichiro Tabata, Ryo Takata, Chongfei Duan
  • Patent number: 11739648
    Abstract: Water droplets that are moved on blade surfaces of a rotor blade are effectively guided toward the blade trailing edge while influence on the strength of the rotor blade is suppressed. A steam turbine rotor blade having a tie-boss for joining to adjacent blades at an intermediate position in the blade length direction is provided. The steam turbine rotor blade includes an airfoil part in which a blade surface is partly hollow as viewed in a section obtained by cutting by an orthogonal plane to a rotation center line of a turbine and a recessed blade surface that is this hollow partial blade surface passes through the blade root side of the tie-boss at least in a region on the pressure side and extends in a strip shape in the blade chord length direction.
    Type: Grant
    Filed: November 19, 2021
    Date of Patent: August 29, 2023
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Yasuhiro Sasao, Soichiro Tabata, Ryo Takata, Takeshi Kudo
  • Patent number: 11732615
    Abstract: A steam turbine hollow stationary blade is able to reduce the amount of water droplets captured on a blade surface. The steam turbine hollow stationary blade, which has a cavity therein, includes a partition wall dividing the cavity into a pressure chamber on a leading edge side and an exhaust chamber on a trailing edge side, at least one steam inlet hole connecting the pressure chamber and an outside of the stationary blade to each other, and at least one pressure conditioning hole connecting the pressure chamber and the exhaust chamber. Total opening area of the pressure conditioning hole is smaller than total opening area of the steam inlet hole.
    Type: Grant
    Filed: July 16, 2021
    Date of Patent: August 22, 2023
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Yasuhiro Sasao, Soichiro Tabata, Ryo Takata, Nao Taniguchi
  • Publication number: 20230258104
    Abstract: A steam turbine exhaust chamber for guiding steam after passing through a rotor blade of a final stage of a steam turbine to outside of the steam turbine includes: a casing; a bearing cone; and a flow guide. An inner surface of the casing includes an inner circumferential surface extending along an axial direction of the rotor at a radially outer side of the flow guide and a side wall surface connecting the inner circumferential surface and the bearing cone. A first protruding portion is formed on the side wall surface along the circumferential direction above a horizontal plane including a rotational axis of the rotor. The first protruding portion is positioned at an outer side, in the radial direction of the rotor, of a downstream end of an inner circumferential surface of the flow guide in at least a partial range in the circumferential direction.
    Type: Application
    Filed: August 13, 2021
    Publication date: August 17, 2023
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Nao Taniguchi, Ryo Takata, Soichiro Tabata
  • Patent number: 11719132
    Abstract: A turbine stator blade (21) includes a pressure side (21P) extending in a radial direction intersecting a flow direction of steam, and facing upstream in the flow direction. A slit (5) extending in the radial direction and capturing a liquefied component of the steam is formed on a downstream side of the pressure side (21P). A hydrophilic uneven region (6) having a liquid film capacity greater than that of the pressure side (21P) by being recessed in a depth direction intersecting the pressure side (21P) is formed in a further upstream position than the slit (5). The hydrophilic uneven region (6) has a depth in the depth direction increasing and a flow resistance decreasing toward downstream and toward the slit (5).
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: August 8, 2023
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Shunsuke Mizumi, Chongfei Duan, Yasuhiro Sasao, Soichiro Tabata
  • Publication number: 20230243273
    Abstract: A drain removal monitoring equipment for monitoring, in a steam turbine, drain removal performed by drawing a fluid outside at least one hollow stator vane including an internal space into the internal space via a slit formed in a surface of the stator vane includes: a gas-liquid separation device for separating the fluid drawn into the internal space into a liquid phase and a gas phase; a liquid-phase flow measurement device for measuring a flow rate of the liquid phase separated by the gas-liquid separation device; a gas-phase flow measurement device for measuring a flow rate of the gas phase separated by the gas-liquid separation device; a liquid-phase return line through which the liquid-phase flow measurement device and the steam turbine communicate with each other, and a gas-phase return line through which the gas-phase flow measurement device and the steam turbine communicate with each other.
    Type: Application
    Filed: May 13, 2021
    Publication date: August 3, 2023
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Ryo Takata, Masaki Osako, Masahiro Ishikawa, Hideaki Sato, Soichiro Tabata, Naoto Tochitani
  • Publication number: 20230193788
    Abstract: This steam turbine is provided with a rotor shaft which rotates about an axis, a plurality of rows of moving blades which are fixed to the outside, in the radial direction, of the rotor shaft, and which are disposed spaced apart in the axial direction along the axis, a casing disposed in such a way as to cover the rotor shaft and the plurality of rows of moving blades, and rows of stationary blades which are fixed to the inside, in the radial direction, of the casing, are disposed spaced apart in the axial direction, and which are disposed on a first side, in the axial direction, of each of the plurality of rows of moving blades, wherein the rows of stationary blades are provided with: a plurality of stationary blades which are disposed spaced apart in the circumferential direction, and each of which extends in the radial direction.
    Type: Application
    Filed: September 28, 2020
    Publication date: June 22, 2023
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Ryo Takata, Yasuhiro Sasao, Hideaki Sato, Soichiro Tabata
  • Publication number: 20230167746
    Abstract: This stationary turbine blade comprises: a stationary blade main body extending in the radial direction intersecting the flow direction of steam; a hydrophilic region which is formed on the surface of the stationary blade main body and which has a higher hydrophilicity than the other parts and has the radial dimension gradually increasing toward the downstream side in the flow direction; and a collecting portion which is provided on the downstream side of the hydrophilic region and which collects a liquid film flowing along the hydrophilic region.
    Type: Application
    Filed: January 12, 2023
    Publication date: June 1, 2023
    Inventors: Chongfei DUAN, Shunsuke MIZUMI, Soichiro TABATA, Koji ISHIBASHI
  • Publication number: 20230017038
    Abstract: A steam turbine according to the present invention comprises: a shaft which rotates about the rotation axis thereof; a plurality of moving blades which extend in the radial direction from the outer peripheral surface of the shaft and which are arranged along the circumferential direction; a casing main body which covers the shaft and the moving blades from the outer peripheral side; a plurality of stationary blades which are arranged on the inner circumferential surface of the casing main body; and a substance supply unit which supplies, to the surfaces of the moving blades and/or the surfaces of the stationary blades, a film forming substance that is hydrophobic, wherein the substance supply unit has a storage unit, a supply passage which is formed inside the casing and through which the film forming substance flows, and discharge units which are formed inside the moving blades and/or the stationary blades and which guide the film forming substance to the surfaces.
    Type: Application
    Filed: September 13, 2022
    Publication date: January 19, 2023
    Inventors: Shigeki SENOO, Soichiro TABATA, Tetsuya SAWATSUBASHI, Hiroyuki MITSUI, Kunio ASAI, Ryuichi MATSUBARA, Kiyoshi TATSUHARA
  • Publication number: 20230003143
    Abstract: This steam turbine comprises: a rotating shaft that extends along an axis; a plurality of rotor blades that are arranged in the circumferential direction and that extend in a radial direction from the outer circumferential surface of the rotating shaft; a casing body that covers the rotating shaft and the rotor blades from the outer circumference side; and a plurality of stationary blades that extend in the radial direction from a position on the inner circumferential surface of the casing body on the upstream side of the rotor blades and that are arranged in the circumferential direction. A plurality of microgrooves that extend in the steam flow direction are formed on the surface of the rotor blades and/or the stationary blades.
    Type: Application
    Filed: September 6, 2022
    Publication date: January 5, 2023
    Inventors: Shigeki SENOO, Soichiro TABATA
  • Patent number: 11536162
    Abstract: An exhaust chamber of a steam turbine according to an embodiment includes an outer casing which includes an end wall part in an axial direction and an extension part extending upward in the axial direction from the end wall part, a first flow guide formed into an annular shape, the first flow guide forming an upstream region of a diffuser surface in a hub-side flow guide and being fixed to an upstream end portion of the extension part on a radially inner side of the diffuser surface, and a second flow guide formed into an annular shape, the second flow guide forming a downstream region of the diffuser surface at a position downstream of the first flow guide and on a radially outer side of the extension part, and being fixed to the extension part.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: December 27, 2022
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Shoki Yamashita, Takaaki Matsuo, Soichiro Tabata
  • Publication number: 20220381157
    Abstract: This turbine stator vane extends in the radial direction which intersects the flow direction of steam, and includes a pressure surface facing the upstream side in the flow direction, and a suction surface facing the downstream side in the flow direction. A plurality of grooves are formed in at least the pressure surface, the grooves extending outward in the radial direction toward the downstream side. At the periphery of the grooves in the pressure surface, formed is a hydrophilic uneven region having greater hydrophilic properties than the pressure surface. The downstream-side ends of the plurality of grooves are connected to slits for capturing a liquified component of the steam.
    Type: Application
    Filed: December 11, 2020
    Publication date: December 1, 2022
    Inventors: Shunsuke MIZUMI, Soichiro TABATA, Chongfei DUAN, Koji ISHIBASHI
  • Patent number: 11486255
    Abstract: A steam turbine blade includes a blade body (7) including blade surfaces (70) extending in a blade height direction. The blade body (7) includes a first suction port (74) extending in the blade height direction and opening in the blade surface (70), a first drain flow path (75) internally extending in the blade height direction, and first communication passages (76) internally provided away from one another in the blade height direction and independently of one another and making the first drain port (74) and the first drain flow path (75) in communication with each other.
    Type: Grant
    Filed: August 27, 2018
    Date of Patent: November 1, 2022
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Yasuhiro Sasao, Soichiro Tabata, Shohei Danno, Yoshinori Tanaka, Hideyuki Toda, Yu Shibata
  • Publication number: 20220228510
    Abstract: A steam turbine stator vane includes a vane body portion which has a vane surface including a pressure surface and a suction surface, a moisture removal channel disposed in the vane body portion, at least one slit opening to the vane surface to communicate with the moisture removal channel and extending along a height direction from a base end portion toward a tip end portion of the vane body portion, and at least one groove portion disposed in the vane surface and extending from the base end portion along the height direction, at least a part of the at least one groove portion overlapping the at least one slit along the height direction.
    Type: Application
    Filed: May 1, 2020
    Publication date: July 21, 2022
    Applicant: Mitsubishi Power, Ltd.
    Inventors: Ryo Takata, Yasuhiro Sasao, Naoto Tochitani, Soichiro Tabata
  • Patent number: 11352908
    Abstract: A turbine stator blade (21) includes a pressure side (21P) extending in a radial direction intersecting a flowing direction of steam and facing upstream in the flowing direction. A slit (5) capturing droplets generated by liquefaction of the steam is formed on a downstream side of the pressure side (21P). A fine uneven region (6), which guides the droplets attached to the pressure side (21P) in the radial direction such that the droplets are moved toward the slit (5) and from upstream toward downstream, is formed in a further upstream position than the slit (5). The fine uneven region (6) has a flow resistance to the droplets gradually increasing from inward to outward in the radial direction.
    Type: Grant
    Filed: February 26, 2020
    Date of Patent: June 7, 2022
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Shunsuke Mizumi, Chongfei Duan, Yasuhiro Sasao, Soichiro Tabata