公开(公告)号：US20170350267A1

公开(公告)日：2017-12-07

申请号：US15536369

申请日：2015-12-15

Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.

Inventor： Kohei OZAKI ,  Azumi YOSHIDA ,  Hidekazu UEHARA ,  Tanehiro SHINOHARA ,  Hiroharu OYAMA

IPC: F01D11/02 ,  F16J15/22 ,  F02C7/28

CPC classification number: F01D11/025 ,  F01D11/001 ,  F02C7/28 ,  F05D2240/57 ,  F05D2240/59 ,  F16J15/22 ,  F16J15/3284 ,  F16J15/3292

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 (δL) 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.

公开(公告)号：US20210222577A1

公开(公告)日：2021-07-22

申请号：US16076201

申请日：2017-02-16

Applicant: Mitsubishi Hitachi Power Systems, Ltd.

Inventor： Kohei OZAKI ,  Hidekazu UEHARA ,  Azumi YOSHIDA ,  Toyoharu NISHIKAWA ,  Eiji KONISHI ,  Shin NISHIMOTO

IPC: F01D11/02 ,  F01D11/12 ,  F16J15/453 ,  F16J15/447 ,  F02C7/28

Abstract: A sealing device seals a gap between an outer circumferential surface of a rotor and an inner circumferential surface of a stator. The sealing device includes a sealing ring provided on the stator and having a free-cutting material, in which a convex portion and a concave portion are alternately formed in an axial direction, on a surface facing the rotor; a plurality of radial fins protruding radially outward from the outer circumferential surface of the rotor; and oblique fins which obliquely protrude from the outer circumferential surface of the rotor toward both ends of the free-cutting material of the sealing ring in the axial direction from the outside of the both ends.

公开(公告)号：US20190136766A1

公开(公告)日：2019-05-09

申请号：US16096885

申请日：2017-05-02

Applicant: Mitsubishi Hitachi Power Systems, Ltd. ,  Eagle Industry Co., Ltd.

Inventor： Azumi YOSHIDA ,  Hidekazu UEHARA ,  Shin NISHIMOTO ,  Naoya TATSUMI ,  Kohei OZAKI ,  Toru KONO ,  Ryu KIKUCHI

IPC: F02C7/28 ,  F04D29/10

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.

公开(公告)号：US20170350510A1

公开(公告)日：2017-12-07

申请号：US15535591

申请日：2015-12-15

Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.

Inventor： Hidekazu UEHARA ,  Kohei OZAKI ,  Azumi YOSHIDA ,  Hiroharu OYAMA

IPC: F16J15/3276 ,  F16J15/3292 ,  F16J15/44

CPC classification number: F16J15/3276 ,  F01D11/00 ,  F02C7/28 ,  F05D2240/58 ,  F05D2300/501 ,  F16J15/22 ,  F16J15/3292 ,  F16J15/442 ,  F16J15/447

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 (δH) between itself and the seal housing (21); a ring-shaped low-pressure-side plate (26) that forms a low-pressure-side gap (δL) 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).

公开(公告)号：US20170328232A1

公开(公告)日：2017-11-16

申请号：US15521045

申请日：2015-10-28

Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.

Inventor： Kohei OZAKI ,  Hidekazu UEHARA ,  Shin NISHIMOTO

IPC: F01D11/24 ,  F01D11/02 ,  F01D11/10 ,  F16J15/44

CPC classification number: F01D11/24 ,  F01D11/001 ,  F01D11/003 ,  F01D11/025 ,  F01D11/10 ,  F01D11/20 ,  F05D2240/55 ,  F16J15/002 ,  F16J15/442 ,  F16J15/445

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.

公开(公告)号：US20180045065A1

公开(公告)日：2018-02-15

申请号：US15550891

申请日：2016-02-09

Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.

Inventor： Azumi YOSHIDA ,  Hidekazu UEHARA ,  Hiroharu OYAMA ,  Kohei OZAKI ,  Katsuhisa HAMADA ,  Hideaki SUGISHITA ,  Toyoharu NISHIKAWA ,  Yoshihiro KUWAMURA ,  Kohei HATANO ,  Keisuke MATSUYAMA

IPC: F01D11/02 ,  F16J15/20 ,  F02C7/28 ,  F01D11/12

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.

公开(公告)号：US20170342909A1

公开(公告)日：2017-11-30

申请号：US15536352

申请日：2015-12-15

Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.

Inventor： Kohei OZAKI ,  Hidekazu UEHARA ,  Azumi YOSHIDA ,  Hiroharu OYAMA

IPC: F02C7/28 ,  F04D29/10 ,  F16J15/22 ,  F16J15/24 ,  F01D11/00

CPC classification number: F02C7/28 ,  F01D11/001 ,  F01D11/003 ,  F04D29/10 ,  F05D2240/55 ,  F05D2240/57 ,  F05D2240/59 ,  F16J15/22 ,  F16J15/24 ,  F16J15/3292

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 (6L) 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.

公开(公告)号：US20190162120A1

公开(公告)日：2019-05-30

申请号：US16097692

申请日：2017-04-21

Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.

Inventor： Azumi YOSHIDA ,  Hidekazu UEHARA ,  Shin NISHIMOTO ,  Naoya TATSUMI ,  Kohei OZAKI

IPC: F02C7/28 ,  F01D11/00 ,  F04D29/10 ,  F16J15/3252 ,  F16J15/3292 ,  F16J15/3288

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).

公开(公告)号：US20180030845A1

公开(公告)日：2018-02-01

申请号：US15551383

申请日：2015-12-22

Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.

Inventor： Azumi YOSHIDA ,  Hidekazu UEHARA ,  Hiroharu OYAMA ,  Kohei OZAKI ,  Katsuhisa HAMADA ,  Hideaki SUGISHITA ,  Toyoharu NISHIKAWA ,  Yoshihiro KUWAMURA ,  Kohei HATANO ,  Keisuke MATSUYAMA

IPC: F01D11/12 ,  F16J15/3288

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.