Patents by Inventor Hidekazu Uehara

Hidekazu Uehara 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: 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: 10662796
    Abstract: A seal device for a turbine includes: a plurality of thin plates arranged along an outer peripheral surface of the rotor, each of the thin plates including a root portion disposed on an outer side in a radial direction of the rotor and supported on a stationary part of the turbine and a tip portion disposed on an inner side in the radial direction of the rotor and having a tip surface facing the outer peripheral surface of the rotor. Each of the thin plates is configured such that a width direction of the thin plate is parallel to an axial direction of the rotor at a side of the root portion, and the tip portion of each of the thin plates is configured such that an end on a side of the high-pressure space is positioned downstream of another end on a side of the low-pressure side.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: May 26, 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: 10619505
    Abstract: A clearance-control-type seal structure including a plurality of arc-shaped grooves (23) formed side by side in the axial direction with respect to an inner circumferential surface of a housing (22) of a turbine; and abradable seal rings (11, 12) having fitting parts (11a, 12a) that are fitted into the grooves so as to leave a prescribed gap, that have extended parts (11b, 12b) that are exposed from the housing in the radial direction toward the inside and expand in the axial direction, and that, during operation, due to back pressure inside the grooves, receive a force that moves in the radial direction toward the inside. One extended part has a protruding part extending even further in the axial direction toward the upstream side, and the other extended part has formed in an outer circumferential surface of a downstream-side end part thereof a recessed part that corresponds to the protruding part.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: April 14, 2020
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Kohei Ozaki, Hidekazu Uehara, Shin Nishimoto
  • Patent number: 10519791
    Abstract: A shaft sealing device includes a plurality of leaves that is arranged in a periphery of a rotating shaft and divides a space around the rotating shaft into two spaces in an axial direction of the rotating shaft, and a side seal plate that is arranged on one side of the plurality of leaves in the axial direction of the rotating shaft and has an opposite surface facing a side end on one side of the plurality of leaves. The side seal plate has a friction reducing portion for reducing a friction force between the opposite surface of the side seal plate and a surface of the side end on the one side of the plurality of leaves.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: December 31, 2019
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Azumi Yoshida, Hidekazu Uehara, Kohei Ozaki, Shin Nishimoto
  • Patent number: 10385714
    Abstract: In a seal structure that seals a gap between a first structure and a second structure which faces the first structure in a radial direction and rotates relative to the first structure, one of the first structure and the second structure has a base surface and a step surface that protrudes toward the other side from the base surface, and the other is provided with: a first fin which extends toward the step surface and forms a first gap between the step surface; a second fin that, on the downstream side of the first fin, extends toward the base surface and forms a second gap between the base surface; and a protrusion part that is disposed between the first fin and the second fin and that divides a leak flow, into a first vortex along the first fin and a second vortex along the second fin.
    Type: Grant
    Filed: November 26, 2014
    Date of Patent: August 20, 2019
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Yoshihiro Kuwamura, Kazuyuki Matsumoto, Hiroharu Oyama, Yoshinori Tanaka, Toyoharu Nishikawa, Hidekazu Uehara, Shin Nishimoto
  • Patent number: 10316679
    Abstract: A seal structure (2) for sealing a gap between a first structure body (10) and a second structure body (51). The seal structure includes: a peripheral surface formed on one of the first structure body and the second structure body; a plurality of seal fins (5) provided at intervals in the axial direction so as to form clearances (m) together with the peripheral surface and protrusions that form re-adhesion edges between pairs of axially adjacent seal fins; the re-adhesion edges being locations at which leak currents (SL) re-adhere that have passed through a clearance (mA) of an upstream seal fin; and the protrusions forming first cavities in which eddies (B1) are created that flow along the upstream seal fin toward the second structure body, and second cavities in which currents (B2) are created that cause a contraction current effect on a clearance (mB) of a downstream seal fin.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: June 11, 2019
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Toyoharu Nishikawa, Yoshihiro Kuwamura, Hiroharu Oyama, Yoshinori Tanaka, Shin Nishimoto, Kazuyuki Matsumoto, Hidekazu Uehara
  • Patent number: 10311984
    Abstract: The shaft sealing structure includes a seal ring that has abutment portions formed by dividing the seal ring along the axial direction and that is provided around a main shaft in a ring-like manner; a support member that is provided in the seal ring along the circumferential direction of the main shaft; and a thermoswitch that is connected to the support member between the abutment portions and that presses the support member toward the center of the main shaft when the temperature rises to a temperature higher than that during normal operation, in which the seal ring is fixed at a position separated from the main shaft during the normal operation and is moved by the support member toward the center of the main shaft when the temperature rises to a temperature higher than that during the normal operation.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: June 4, 2019
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Kentarou Saeki, Hidekazu Uehara, Akihiko Umeda, Masaru Sakai, Hiroshi Kuzumi, Yasuhiro Ikeda, Toshihiko Matsuo, Takanobu Otani, Hiroomi Sakuma, Hitoshi Ito, Yasushi Takayama, Tomoki Hanada, Yuji Harada
  • Publication number: 20190162120
    Abstract: A seal segment (11) includes a retainer (21), a seal body (13) having a thin plate seal piece (20), a high-pressure side plate (23), a low-pressure side plate, a retainer simulating section (51) further extending in the circumferential direction (Dc) from an end portion of the retainer (21) in the circumferential direction (Dc), and a block body (50) including a seal body simulation section (53) extending inward in the radial direction (Dr) from the retainer simulation section. The high-pressure side plate (23) and the low-pressure side plate cover at least a part of the seal body simulation section (53) of the block body (50).
    Type: Application
    Filed: April 21, 2017
    Publication date: May 30, 2019
    Applicant: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Azumi YOSHIDA, Hidekazu UEHARA, Shin NISHIMOTO, Naoya TATSUMI, Kohei OZAKI
  • Publication number: 20190145320
    Abstract: A seal segment (11) includes a seal body having a plurality of laminated thin plate seal pieces (20), and a high-pressure side plate (23). The high-pressure side plate (23) includes an outer diameter side edge portion (23b) which is an outer edge portion in the radial direction (Dr) and extends in a circular are shape in the circumferential direction (Dc), an inner diameter side edge portion (23c) which is an inner edge portion in a radial direction (Dr) and extends in a circular arc shape in the circumferential direction (Dc), and a front edge portion (23d) which is an edge portion on a front side in the rotational direction (Bc). The high-pressure side plate (23) further includes a reinforcing portion (40) only in a region of the high-pressure side plate (23) on the front side in the rotational direction (Bc).
    Type: Application
    Filed: April 19, 2017
    Publication date: May 16, 2019
    Applicant: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Azumi Yoshida, Hidekazu Uehara, Shin Nishimoto, Naoya Tatsumi, Kohei Ozaki
  • Publication number: 20190136766
    Abstract: A seal segment includes a retainer extending in a circumferential direction of a rotary shaft on an outer circumferential side of the rotary shaft; a first seal body which has a plurality of first thin plate seal pieces extending inward in a radial direction from the retainer and laminated in the circumferential direction; a high-pressure side plate; a low-pressure side plate; and a second seal body having a plurality of second thin plate seal pieces which are laminated at an end portion of the retainer in the circumferential direction, extend inward in the radial direction, and have fluttering resistance higher than the first thin plate seal piece. The high-pressure side plate and the low-pressure side plate cover at least a part of the second seal body in the circumferential direction.
    Type: Application
    Filed: May 2, 2017
    Publication date: May 9, 2019
    Applicants: Mitsubishi Hitachi Power Systems, Ltd., Eagle Industry Co., Ltd.
    Inventors: Azumi YOSHIDA, Hidekazu UEHARA, Shin NISHIMOTO, Naoya TATSUMI, Kohei OZAKI, Toru KONO, Ryu KIKUCHI
  • Publication number: 20190093514
    Abstract: In a steam turbine including a rotor including a free side end fixed by a journal bearing (not illustrated) in a radial direction and a fixed side end fixed by a thrust bearing in an axial direction, and a casing including a fixed side end fixed by the thrust bearing in the axial direction (rotor axial direction), a casing position adjustment device is configured to adjust an axial position of the casing with respect to the rotor due to thermal expansion. The casing position adjustment device includes: a low-pressure casing end plate, which is an end plate oriented to a free side in the axial direction in a low-pressure casing of the casing, and has a diaphragm shape deformable in the axial direction; and actuators, which deform the low-pressure casing end plate so that the low-pressure casing end plate extends toward the free side in the axial direction.
    Type: Application
    Filed: February 28, 2017
    Publication date: March 28, 2019
    Inventors: Takumi HORI, Hidekazu UEHARA, Kentarou SAEKI, Katsuhisa HAMADA
  • Publication number: 20190048734
    Abstract: A rotary machine includes: a stationary body having a stationary-side peripheral surface; a rotating body having a rotating-side peripheral surface facing the stationary side-peripheral surface. One surface which is one of the stationary-side peripheral surface and the rotating-side peripheral surface has an upstream-side peripheral surface, a downstream-side peripheral surface, and a rearward step surface. The other surface has an upstream-side seal fin forming a minute gap between the upstream-side seal fin and the upstream-side peripheral surface; a downstream-side seal fin forming a minute gap between the downstream-side seal fin and the downstream-side peripheral surface. The rearward step surface has a guide surface extending downstream Da2 while directed toward the other surface and connected to the upstream-side peripheral surface.
    Type: Application
    Filed: February 17, 2017
    Publication date: February 14, 2019
    Applicant: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Yoshihiro Kuwamura, Eiji Konishi, Toyoharu Nishikawa, Shin Nishimoto, Hidekazu Uehara
  • Patent number: 10196987
    Abstract: A shaft sealing mechanism (11) that partitions an annular space (14) that is formed between a fixed part (12) and a rotating shaft (13) into a high-pressure-side region and a low-pressure-side region, that obstructs the flow of a fluid (G), and that is provided with: a plurality of annularly laminated thin-plate seal pieces (22) that are fixed to an annular seal housing (21) that is provided to the fixed part and are in sliding contact with the rotating shaft; and an annular low-pressure-side plate (26) that is sandwiched and held such that a low-pressure-side gap (?L) is formed between the seal housing and a low-pressure-side side edge part (22d) of the thin-plate seal pieces. The thin-plate seal pieces have pressure-conduction holes (31) that are formed further to the inside in the radial direction of the rotating shaft than an inner-circumferential-side tip part (26a) of the low-pressure-side plate.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: February 5, 2019
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Kohei Ozaki, Hidekazu Uehara, Azumi Yoshida, Hiroharu Oyama
  • Patent number: 10190433
    Abstract: A shaft sealing mechanism (11) that partitions an annular space (14) that is formed between a fixed part (12) and a rotating shaft (13) into a high-pressure-side region and a low-pressure-side region, that obstructs the flow of a fluid (G), and that is provided with: a plurality of annularly laminated thin-plate seal pieces (22) that are fixed to an annular seal housing (21) that is provided to the fixed part and are in sliding contact with the rotating shaft; and an annular low-pressure-side plate (26) that is sandwiched and held such that a low-pressure-side gap (?L) is formed between the seal housing and a low-pressure-side side edge part (22d) of the thin-plate seal pieces. The thin-plate seal pieces have a thick part (31) that is formed further to the inside in the radial direction of the rotating shaft than an inner-circumferential-side tip part (26a) of the low-pressure-side plate.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: January 29, 2019
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Kohei Ozaki, Azumi Yoshida, Hidekazu Uehara, Tanehiro Shinohara, Hiroharu Oyama
  • Patent number: 10174844
    Abstract: A shaft seal mechanism (11) that blocks a fluid (G) flowing within a ring-shaped space (14) is equipped with: a ring-shaped seal housing (21) disposed on a fixed section (12); a plurality of thin-plate seal pieces (22) that are secured to the seal housing (21), are in sliding contact with a rotating shaft (13), and are layered in a ring shape; a ring-shaped high-pressure-side plate (25) that forms a high-pressure-side gap (?H) between itself and the seal housing (21); a ring-shaped low-pressure-side plate (26) that forms a low-pressure-side gap (?L) between the seal housing (21) and the thin-plate seal pieces (22); stepped sections (31, 32) that are formed on side edge sections (22c, 22d) of the thin-plate seal pieces (22); and locking sections (25b, 26b) that lock the stepped sections (31, 32).
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: January 8, 2019
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Hidekazu Uehara, Kohei Ozaki, Azumi Yoshida, Hiroharu Oyama
  • Publication number: 20180371927
    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: Application
    Filed: November 24, 2016
    Publication date: December 27, 2018
    Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Yoshihiro Kuwamura, Eiji Konishi, Toyoharu Nishikawa, Shin Nishimoto, Hidekazu Uehara
  • Patent number: 10024434
    Abstract: A rotary machine (100) includes a rotor (5) that rotates about an axis, a seal housing (30) that is disposed so as to face an outer peripheral surface of the rotor (5), and a seal body (10) that includes a plurality of thin plates (20) extending inward from the seal housing (30) in a radial direction and laminated in a circumferential direction. One thin plate (20) of the plurality of thin plates (20) has a shape in which the thin plate comes into contact with the other thin plates (20) provided on front and rear sides in a rotational direction in a state in which the thin plate does not come into contact with the rotor (5).
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: July 17, 2018
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Kohei Ozaki, Hidekazu Uehara, Shin Nishimoto
  • Patent number: 10006292
    Abstract: A turbine includes blades and a structure rotating relative to the blades and having a fluid flowing thereto. The turbine includes step portions that are provided in either radial tip portions of the blades or areas of the structure that face the radial tip portions; sealing fins that extend from the other of the radial tip portions of the blades or areas of the structure that face the radial tip portions toward the step portions, and form minute gaps between the sealing fins and the step portions; a flow collision surface that is provided upstream of the sealing fins in a flow direction of the fluid and against which the fluid collides; a protrusion that protrudes toward an upstream side from the flow collision surface; and a facing surface that faces the flow collision surface.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: June 26, 2018
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Yoshihiro Kuwamura, Kazuyuki Matsumoto, Hiroharu Oyama, Yoshinori Tanaka, Hidekazu Uehara, Yukinori Machida
  • Publication number: 20180045065
    Abstract: A seal device for a turbine includes: a plurality of thin plates arranged along an outer peripheral surface of the rotor, each of the thin plates including a root portion disposed on an outer side in a radial direction of the rotor and supported on a stationary part of the turbine and a tip portion disposed on an inner side in the radial direction of the rotor and having a tip surface facing the outer peripheral surface of the rotor. Each of the thin plates is configured such that a width direction of the thin plate is parallel to an axial direction of the rotor at a side of the root portion, and the tip portion of each of the thin plates is configured such that an end on a side of the high-pressure space is positioned downstream of another end on a side of the low-pressure side.
    Type: Application
    Filed: February 9, 2016
    Publication date: February 15, 2018
    Inventors: Azumi YOSHIDA, Hidekazu UEHARA, Hiroharu OYAMA, Kohei OZAKI, Katsuhisa HAMADA, Hideaki SUGISHITA, Toyoharu NISHIKAWA, Yoshihiro KUWAMURA, Kohei HATANO, Keisuke MATSUYAMA
  • Publication number: 20180030845
    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: Application
    Filed: December 22, 2015
    Publication date: February 1, 2018
    Inventors: Azumi YOSHIDA, Hidekazu UEHARA, Hiroharu OYAMA, Kohei OZAKI, Katsuhisa HAMADA, Hideaki SUGISHITA, Toyoharu NISHIKAWA, Yoshihiro KUWAMURA, Kohei HATANO, Keisuke MATSUYAMA