Patents by Inventor Yoshihiro Kuwamura

Yoshihiro Kuwamura 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: 11149588
    Abstract: An exhaust chamber of a steam turbine includes a casing, an inner flow guide portion disposed in the casing so as to define an outer boundary of a diffuser passage communicating with an outlet of a last stage blade in the steam turbine, and an outer flow guide portion disposed on an outer peripheral side of the inner flow guide portion in the casing. The exhaust chamber has an exhaust chamber outlet on a lower side thereof. The outer flow guide portion is disposed at least around an upper half region of the inner flow guide portion.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: October 19, 2021
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventor: Yoshihiro Kuwamura
  • Patent number: 11131201
    Abstract: In a rotating machine, a tip shroud of a rotor blade includes a plurality of shroud outer peripheral surfaces which are provided such that radial positions of the shroud outer peripheral surfaces are located stepwise radially outward from an upstream side toward a downstream side, and a step portion which connects adjacent shroud outer peripheral surfaces to each other. The step portion includes an acute angle-forming surface which extends toward the upstream side while extending toward a radially outer side and is connected to an upstream-side end portion of the shroud outer peripheral surface located on the downstream side with an acute angle ?1.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: September 28, 2021
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Kazuyuki Matsumoto, Yoshihiro Kuwamura
  • Patent number: 11131217
    Abstract: A steam turbine exhaust chamber includes a casing and a bearing cone disposed in the casing. The casing has a recess provided along at least a part of a circumference of the casing on a radially outer side of a downstream end of the bearing cone and recessed downstream in an axial direction with respect to the downstream end of the bearing cone.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: September 28, 2021
    Assignee: MITSUBISHI POWER, LTD.
    Inventors: Ryo Murakami, Kazuyuki Matsumoto, Yoshihiro Kuwamura, Toyoharu Nishikawa, Soichiro Tabata
  • Publication number: 20210285338
    Abstract: An exhaust chamber of a steam turbine includes a casing, an inner flow guide portion disposed in the casing so as to define an outer boundary of a diffuser passage communicating with an outlet of a last stage blade in the steam turbine, and an outer flow guide portion disposed on an outer peripheral side of the inner flow guide portion in the casing. The exhaust chamber has an exhaust chamber outlet on a lower side thereof. The outer flow guide portion is disposed at least around an upper half region of the inner flow guide portion.
    Type: Application
    Filed: October 31, 2017
    Publication date: September 16, 2021
    Applicant: Mitsubishi Heavy Industries, Ltd.
    Inventor: Yoshihiro KUWAMURA
  • Patent number: 11105213
    Abstract: There are provided a seal fin, a seal structure, a turbo machine, and a method for manufacturing a seal fin. The seal fin suppresses leak of a fluid from a gap between a first and a second structures facing each other in a radius direction, and is formed on the first structure while keeping a clearance with respect to the second structure. The seal fin includes: a fin main body extending in the radius direction; and a protrusion being formed between a front face of the fin main body and a tip face and protruding toward an upstream side. A length of the protrusion is 1.5 times a length of the fin main body or less; an angle of the protrusion is 75 degrees or less; and a tilt angle of the fin main body is set in a range of ?60 degrees or more and 60 degrees or less.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: August 31, 2021
    Assignee: MITSUBISHI POWER, LTD.
    Inventors: Toyoharu Nishikawa, Yoshihiro Kuwamura, Hiroharu Oyama, Katsuhisa Hamada, Hideaki Sugishita
  • Patent number: 11092026
    Abstract: A rotor machine includes a rotor which includes a recessed portion, a stator blade which includes a stator blade body and a shroud, and a fin. The recessed portion includes a recessed portion radial wall surface which extends in a radial direction, and the recessed portion radial wall surface includes a first wall surface which extends radially outward, a second wall surface which extends further radially outward than the first wall surface, and a protrusion surface which protrudes toward an upstream side in the axis direction from the first wall surface. The shroud includes a shroud radial wall surface facing a downstream side in the axis direction of the recessed portion radial wall surface, and a shroud groove portion is formed in the shroud.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: August 17, 2021
    Assignee: MITSUBISHI POWER, LTD.
    Inventors: Yoshihiro Kuwamura, Kazuyuki Matsumoto
  • Patent number: 11073047
    Abstract: A steam turbine (ST) includes a rotor (11) which is rotatable around an axis (Ar), an inner casing (21) surrounding the rotor (11) from an outer peripheral side, an outer casing (30) surrounding the rotor (11) and the inner casing (21) and defining an exhaust chamber between the inner casing (21) and the outer casing (30), the steam being exhausted to the exhaust chamber (30s), and a flow guide (27) which has a tubular shape and is installed on one end portion of the inner casing 21 in an axial direction (Da) in the exhaust chamber (30s) to guide the steam discharged from the rotor (11). The flow guide (27) has a turning surface (RA) which is connected to an outer peripheral surface (27A) and turns a fluid flowing along the outer peripheral surface (27A) toward the other side in the axial direction (Da).
    Type: Grant
    Filed: August 15, 2018
    Date of Patent: July 27, 2021
    Assignee: MITSUBISHI POWER, LTD.
    Inventors: Hideaki Sugishita, Soichiro Tabata, Toyoharu Nishikawa, Tadashi Takahashi, Kazuyuki Matsumoto, Yoshihiro Kuwamura
  • Patent number: 11066946
    Abstract: In an axial turbomachinery related to the invention, a structural body has a casing fin, a blade is provided with an upstream inclined surface that is inclined from an upstream side toward a downstream side, the structural body is provided with an upstream inclined inner wall surface that is inclined from the upstream side the downstream side, an inclination angle of the upstream inclined surface with respect to a central axis of relative rotation between the blade and the structural body is larger than an inclination angle of the upstream inclined inner wall surface with respect to the central axis, and an end position of the upstream inclined surface on a radially inner side is located radially outside an end position of the upstream inclined inner wall surface on the radially inner side.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: July 20, 2021
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Eiji Konishi, Yoshihiro Kuwamura, Kazuyuki Matsumoto, Shinji Fukao, Hideaki Sugishita
  • Publication number: 20210180470
    Abstract: An exhaust hood is provided with an inner casing, an outer casing, and a diffuser. The inner casing surrounds a rotor from the outside in a radial direction, and forms a first space in which a fluid flows in an axial direction between the rotor and the inner casing. The diffuser is provided with a bearing cone that has a diameter that gradually widens moving towards an axial downstream side and forms a cylindrical shape extending to the axial downstream side to be continuous with the outer circumferential surface of a rotor shaft that forms the first space. An end edge on the axial downstream side of the bearing cone forms an oval shape in which a distance between the axial line and a second cone end part of a second side is greater than a distance between the axial line and a first cone end part.
    Type: Application
    Filed: December 25, 2018
    Publication date: June 17, 2021
    Applicant: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Yoshihiro Kuwamura, Hideaki Sugishita, Kazuyuki Matsumoto, Toyoharu Nishikawa, Kei Nakanishi
  • Patent number: 11022003
    Abstract: A steam turbine exhaust chamber defining therein an exhaust passage through which steam having passed through a last-stage blade of a steam turbine is introduced to a condenser includes: a casing including an outer peripheral wall portion formed on an outer peripheral side of the exhaust passage; a bearing cone disposed on a radially inner side of the outer peripheral wall portion; and at least one bypass passage carrying a part of steam flowing through the exhaust passage from a high-pressure portion of the exhaust passage to a low-pressure portion of the exhaust passage or to the condenser, The at least one bypass passage includes a high-pressure-side opening formed in the bearing cone and a low-pressure-side opening facing steam having a lower pressure than steam facing the high-pressure-side opening.
    Type: Grant
    Filed: February 12, 2019
    Date of Patent: June 1, 2021
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Toyoharu Nishikawa, Hideaki Sugishita, Kazuyuki Matsumoto, Yoshihiro Kuwamura, Kei Nakanishi
  • Publication number: 20210131293
    Abstract: In a rotating machine, a tip shroud of a rotor blade includes a plurality of shroud outer peripheral surfaces which are provided such that radial positions of the shroud outer peripheral surfaces are located stepwise radially outward from an upstream side toward a downstream side, and a step portion which connects adjacent shroud outer peripheral surfaces to each other. The step portion includes an acute angle-forming surface which extends toward the upstream side while extending toward a radially outer side and is connected to an upstream-side end portion of the shroud outer peripheral surface located on the downstream side with an acute angle ?1.
    Type: Application
    Filed: February 28, 2018
    Publication date: May 6, 2021
    Inventors: Kazuyuki MATSUMOTO, Yoshihiro KUWAMURA
  • Patent number: 10982719
    Abstract: There are provided a seal fin, a seal structure, and a turbo machine that can achieve a high leak-suppressing effect and can reduce leak loss of the turbo machine. The disclosure suppresses leak of a fluid from a gap between a first structure being in a static state and a second structure rotating around an axis line and is formed on the first structure so as to extend toward the second structure while keeping a clearance between a tip face thereof on an extending direction and the second structure. The first structure and the second structure face each other in a radius direction with the gap inbetween. A plurality of hollows opening at a tip on the extending direction are arranged along a circumference direction in parallel with each other on a front face facing an upstream side of a flow direction of the fluid.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: April 20, 2021
    Assignee: MITSUBISHI POWER, LTD.
    Inventors: Toyoharu Nishikawa, Yoshihiro Kuwamura, Hiroharu Oyama, Katsuhisa Hamada, Hideaki Sugishita
  • Patent number: 10975711
    Abstract: A seal structure is for sealing leakage fluid flowing through a gap between a rotation member rotating about a rotation axis and a stationary member facing the rotation member. The seal structure includes seal fins projecting from a base that is one of the rotation and stationary members toward the other one, the seal fins being spaced apart from each other at a certain interval in an axial direction of the rotation axis; and a step section provided to the other one, the step section including step surfaces facing the seal fins and a riser surface between the adjacent step surfaces, the step surfaces and the riser surface defining a step portion. The seal fins are inclined upstream in a flow direction of the leakage fluid relative to a radial direction perpendicular to the rotation axis. Each seal fin and the base define a corner portion having a curved surface.
    Type: Grant
    Filed: November 24, 2016
    Date of Patent: April 13, 2021
    Assignee: MITSUBISHI POWER, LTD.
    Inventors: Yoshihiro Kuwamura, Eiji Konishi, Toyoharu Nishikawa, Shin Nishimoto, Hidekazu Uehara
  • Patent number: 10954808
    Abstract: A sealing device for suppressing a leakage flow of a fluid via an annular gap between a stationary member and a rotary member of a rotary machine includes: a fixed fin having an annular shape and disposed in the annular gap; and a movable fin having an annular shape and being disposed adjacent to the fixed fin in an axial direction inside the annular gap. The movable fin has a greater thermal expansion coefficient than the fixed fin and is fixed to the fixed fin in a fixing region on a root-end side of the movable fin.
    Type: Grant
    Filed: May 23, 2016
    Date of Patent: March 23, 2021
    Assignee: MITSUBISHI POWER, LTD.
    Inventors: Yoshihiro Kuwamura, Hiroharu Oyama, Yoshinori Tanaka, Hideaki Sugishita
  • Patent number: 10941670
    Abstract: A seal structure is for sealing leakage fluid flowing through a gap between a rotation member rotating about a rotation axis and a stationary member facing the rotation member. The seal structure includes seal fins projecting from a base that is one of the rotation and stationary members toward the other one, the seal fins being spaced apart from each other at a certain interval in an axial direction of the rotation axis; and a step section provided to the other one, the step section including step surfaces facing the seal fins and a riser surface between the adjacent step surfaces, the step surfaces and the riser surface defining a step portion. The seal fins are inclined upstream in a flow direction of the leakage fluid relative to a radial direction perpendicular to the rotation axis. Each seal fin and the base define a corner portion having a curved surface.
    Type: Grant
    Filed: November 24, 2016
    Date of Patent: March 9, 2021
    Assignee: MITSUBISHI POWER, LTD.
    Inventors: Yoshihiro Kuwamura, Eiji Konishi, Toyoharu Nishikawa, Shin Nishimoto, Hidekazu Uehara
  • Patent number: 10895169
    Abstract: An exhaust casing is provided with an outer casing which communicates with a diffuser. The outer casing has a downstream side end plate defining an edge on an axially downstream side of an exhaust space, and an inclined plate connected to the downstream side end plate. The inclined plate gradually widens toward an axially upstream side toward a radially outer side. An angle of an inclined inner surface of the inclined plate with respect to a tangential line at an end on the radially outer side of an inner peripheral surface of an outer diffuser, which is an upstream side angle of the axially upstream side on the basis of the tangential line, is greater than a downstream side angle of the axially downstream side.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: January 19, 2021
    Assignee: MITSUBISHI POWER, LTD.
    Inventors: Yoshihiro Kuwamura, Kazuyuki Matsumoto
  • Patent number: 10822984
    Abstract: A sealing device includes a fin, a through hole, and a high pressure fluid supplying unit. The fin extends from a stationary body toward a rotating body in a gap between the stationary and rotating bodies. The fin is not in contact with the rotating body. The through hole is formed to be opened in at least one of the stationary body and the rotating body on an upstream side of the fin in a flow direction of a fluid to flow into the gap between the stationary body and the rotating body. The through hole is opened toward an upstream side of the fluid to flow in the gap between the stationary body and the rotating body. The high pressure fluid supplying unit is configured to supply a high pressure fluid to the gap from the through hole. The high pressure fluid has a higher pressure than the fluid.
    Type: Grant
    Filed: October 20, 2016
    Date of Patent: November 3, 2020
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Toyoharu Nishikawa, Katsuhisa Hamada, Yoshihiro Kuwamura
  • Publication number: 20200309149
    Abstract: There is provided a rotating machinery including: a rotating body R which is rotatable around an axis O and has a first facing surface P1 that widens in a plane intersecting the axis O; a stationary body S which faces the first facing surface P1 from the axial direction O, and has a second facing surface P2 forming a flow path F1 through which a fluid flows from a radially inner side toward the radially outer side between the first facing surface P1 and the second facing surface P2; and a rotation side projection portion 80 which projects from the first facing surface P1 toward the second facing surface P2, has an annular shape around the axis O, and faces the second facing surface P2 via a clearance C.
    Type: Application
    Filed: January 22, 2020
    Publication date: October 1, 2020
    Inventors: Masamichi IINO, Martino RECLARI, Takeshi SANO, Shuichi YAMASHITA, Yoshihiro KUWAMURA
  • Patent number: 10731499
    Abstract: A seal device for a turbine is disposed around a rotor so as to separate a high-pressure space and a low-pressure space and includes: a plurality of thin plates arranged along an outer peripheral surface of the rotor. Each of the thin plates has a thin-plate tip surface facing the outer peripheral surface of the rotor; a first side plate disposed so as to face the high-pressure space and covering outer peripheral regions of first side surfaces; and a second side plate disposed so as to face the low-pressure space and covering outer peripheral regions of second side surfaces. The first side surface of each of the thin plates is covered with the first side plate in a region extending further to an inner side, in a radial direction of the rotor, than a region of the second side surface covered with the second side plate.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: August 4, 2020
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Azumi Yoshida, Hidekazu Uehara, Hiroharu Oyama, Kohei Ozaki, Katsuhisa Hamada, Hideaki Sugishita, Toyoharu Nishikawa, Yoshihiro Kuwamura, Kohei Hatano, Keisuke Matsuyama
  • Patent number: 10718434
    Abstract: There are provided a step seal, a seal structure, a turbo machine, and a method for manufacturing a step seal. The step seal suppresses leak of a fluid from a gap between a first structure and a second structure and is formed on the first structure so as to have a clearance between the step seal and a seal fin formed on the second structure. The first structure and the second structure face each other in a radius direction with the gap inbetween and rotate around an axis line relative to each other. The step seal includes: a step seal body having a step face facing an upstream side of a flow direction of the fluid and an opposed face facing the second structure; and a protrusion formed between the step face and the opposed face.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: July 21, 2020
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Toyoharu Nishikawa, Yoshihiro Kuwamura, Hiroharu Oyama, Katsuhisa Hamada, Hideaki Sugishita