Patents by Inventor Tanehiro Shinohara

Tanehiro Shinohara 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).

  • Publication number: 20110316237
    Abstract: A shaft seal that is constituted by annularly arranging a plurality of seal segments in the circumferential direction of a rotating shaft, in which each seal segment has a plurality of thin plates that are provided in a predetermined arrangement in the circumferential direction of the rotating shaft, side plates that sandwich the plurality of thin plates from both sides thereof in the axial direction, and retention rings that retain the base ends of the plurality of thin plates and the base ends of the side plates; the distal ends of the thin plates protrude farther toward the rotating shaft than the distal ends of the side plates, and the protrusion length of the distal ends of the thin plates in the vicinity of the end portions in the circumferential direction where adjacent seal segments are connected is set to be less than the protrusion length of the distal ends of the thin plates that are located at the middle of the seal segment in the circumferential direction.
    Type: Application
    Filed: June 9, 2010
    Publication date: December 29, 2011
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Hidekazu Uehara, Tanehiro Shinohara, Takashi Nakano, Shin Nishimoto
  • Publication number: 20110309585
    Abstract: A shaft seal device that seals between the outer peripheral surface of a rotating shaft and a stationary member that is provided on the outer peripheral side of the rotating shaft, provided with a thin-plate seal that has a plurality of thin plates that are arranged in the circumferential direction of the rotating shaft and an abradable seal that is arranged at a position differing with the thin-plate seal in the axial direction, and having a free-cutting material that is disposed at either one of the rotating shaft and the stationary member, and a seal fin that projects toward the rotating shaft or stationary member from the other of the rotating shaft and the stationary member.
    Type: Application
    Filed: June 8, 2010
    Publication date: December 22, 2011
    Inventors: Hidekazu Uehara, Tanehiro Shinohara, Takashi Nakano, Shin Nishimoto, Yuichi Hirakawa
  • Patent number: 8025296
    Abstract: In a shaft sealing mechanism which prevents fluid from flowing in an axial direction of a rotor through an annular gap between the rotor and a stator, there are provided a high pressure side plate positioned on a high pressure side region of a plurality of sheets, and a low pressure side plate positioned on a low pressure side region of the plurality of sheets, and construction is such that in a state in which the plurality of sheets is fixed on a stator side, and when under gas pressure, the sheets make contact with each other.
    Type: Grant
    Filed: October 23, 2006
    Date of Patent: September 27, 2011
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Hidekazu Uehara, Tanehiro Shinohara, Takashi Nakano, Shin Nishimoto, Hirokazu Shirai, Toshio Asada
  • Patent number: 7364165
    Abstract: A leaf seal as a shaft seal mechanism is made compact and enables reduction of manufacturing cost. Plural thin plates 29 lapped one on another in layers have their outer circumferential proximal ends fixed to each other by welding so that an annular thin plate assembly 29A having flexibility is formed. This thin plate assembly 29A is bent and assembled to form the leaf seal 25.
    Type: Grant
    Filed: May 20, 2004
    Date of Patent: April 29, 2008
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Takashi Nakano, Hirokazu Shirai, Toshio Asada, Shin Nishimoto, Tanehiro Shinohara, Hidekazu Uehara
  • Patent number: 7261515
    Abstract: A shaft sealing mechanism of an annular shape having at least one divided portion, which is installed in an annular space between a rotor and a stator, includes a group of thin plates. Outer peripheral ends of the thin plates are joined, and inner peripheral free ends come in contact with the rotor in a sliding manner so that a surface of the rotor and the thin plates form an acute angle to partition the annular space into a high-pressure region and a low-pressure region without being joined. At least a low-pressure gap near the divided portion is set to be larger than a low-pressure gap in a circumferential direction other than near the divided portion.
    Type: Grant
    Filed: August 10, 2005
    Date of Patent: August 28, 2007
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Shin Nishimoto, Tanehiro Shinohara, Hidekazu Uehara, Takashi Nakano
  • Patent number: 7226053
    Abstract: A shaft seal mechanism (leaf seal) by which a desired seal performance can be stably obtained is provided. The shaft seal mechanism comprises a concave groove 71 formed larger than a minimum size of a plate width of thin plates 29 and a fitting piece 61 fitted in a gap between the concave groove 71 and a leaf seal 25. The leaf seal 25 comprises an annular thin plate assembly 29A constructed by the thin plates 29 and a plate spring 56 integrally formed therewith supporting the annular thin plate assembly 29A to be levitated coaxially with a rotating shaft 23. The thin plates 29 have their outer circumferential proximal end side made movable relative to the concave groove 71. A shaft seal mechanism assembling structure is also provided comprising a pressure receiving surface 61b and a lower pressure side plate 54 forming a predetermined gap size between the pressure receiving surface 61b and one side edges of the thin plates 29.
    Type: Grant
    Filed: May 19, 2004
    Date of Patent: June 5, 2007
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Takashi Nakano, Hirokazu Shirai, Toshio Asada, Shin Nishimoto, Tanehiro Shinohara, Hidekazu Uehara
  • Publication number: 20070102886
    Abstract: There is provided a shaft sealing mechanism in which, even in a case where eccentricity occurs in a parent machine, flutter behavior of the sheets can be reliably prevented, the sheets can be prevented from failing due to fatigue, and also a long life and reliability of the shaft sealing mechanism can be improved. In a shaft sealing mechanism which prevents fluid from flowing in an axial direction of a rotor through an annular gap between the rotor and a stator, there are provided a high pressure side plate positioned on a high pressure side region of a plurality of sheets, and a low pressure side plate positioned on a low pressure side region of a plurality of sheets, and the construction is such that in a state in which the plurality of sheets is fixed on the stator side, and when under gas pressure, the parts make contact with each other.
    Type: Application
    Filed: October 23, 2006
    Publication date: May 10, 2007
    Inventors: Hidekazu Uehara, Tanehiro Shinohara, Takashi Nakano, Shin Nishimoto, Hirokazu Shirai, Toshio Asada
  • Patent number: 7066468
    Abstract: An object of the present invention is to provide a shaft seal which reduces the leakage of gas from the high pressure side to the low pressure side, and has excellent corrosion-resistance, and a gas turbine which is equipped with the shaft seal; in order to achieve the object, the present invention provide a shaft seal comprising a plurality of flexible thin plates having width in the axial direction of a rotary shaft, tips thereof sliding against a peripheral face of said rotary shaft, and outer peripheral bases thereof being secured to a casing side maintaining a gap therebetween, said thin plates being laminated in the peripheral direction of said rotary shaft, enabling the outer periphery of said rotary shaft to be sealed, an acute angle being formed between the thin plates and the peripheral face of said rotary shaft; and a low pressure side side-plate and a high pressure side side-plate which are provided on both sides of said thin plates in the axial direction of said rotary shaft, wherein it further c
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: June 27, 2006
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Hidekazu Uehara, Tanehiro Shinohara, Kouichi Akagi, Masanori Yuri
  • Publication number: 20060033285
    Abstract: A shaft sealing mechanism of an annular shape having at least one divided portion, which is installed in an annular space between a rotor and a stator, includes a group of thin plates. Outer peripheral ends of the thin plates are joined, and inner peripheral free ends come in contact with the rotor in a sliding manner so that a surface of the rotor and the thin plates form an acute angle to partition the annular space into a high-pressure region and a low-pressure region without being joined. At least a low-pressure gap near the divided portion is set to be larger than a low-pressure gap in a circumferential direction other than near the divided portion.
    Type: Application
    Filed: August 10, 2005
    Publication date: February 16, 2006
    Inventors: Shin Nishimoto, Tanehiro Shinohara, Hidekazu Uehara, Takashi Nakano
  • Patent number: 6976680
    Abstract: The shaft seal structure is based on a leaf seal that includes springs, disposed between the stator blades and the leaf seal ring, to force the leaf seal ring away from the rotation shaft, and pressure guiding grooves for guiding the fluid pressure, through a boundary of planar plates, to a space between the outer peripheral surface of the leaf seal ring and the inner peripheral surface of the stator blade. Also, a turbine may be provided with the leaf seal so as to reduce gas leakage from the high-pressure-region to the low-pressure-region as well as to control the frictional wear between the planar plates and the rotation shaft.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: December 20, 2005
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Hidekazu Uehara, Tanehiro Shinohara, Kouichi Akagi, Masanori Yuri, Takashi Nakano, Shin Nishimoto
  • Publication number: 20050012275
    Abstract: A shaft seal mechanism (leaf seal) by which a desired seal performance can be stably obtained is provided. The shaft seal mechanism comprises a concave groove 71 formed larger than a minimum size of a plate width of thin plates 29 aid a fitting piece 61 fitted in a gap between the concave groove 71 and a leaf seal 25. The leaf seal 25 comprises an annular thin plate assembly 29A constructed by the thin plates 29 and a plate spring 56 integrally formed therewith supporting the annular thin plate assembly 29A to be levitated coaxially with a rotating shaft 23. The thin plates 29 have their outer circumferential proximal end side made movable relative to the concave groove 71. A shaft seal mechanism assembling structure is also provided comprising a pressure receiving surface 61b and a lower pressure side plate 54 forming a predetermined gap size between the pressure receiving surface 61b and one side edges of the thin plates 29.
    Type: Application
    Filed: May 19, 2004
    Publication date: January 20, 2005
    Inventors: Takashi Nakano, Hirokazu Shirai, Toshio Asada, Shin Nishimoto, Tanehiro Shinohara, Hidekazu Uehara
  • Publication number: 20040256810
    Abstract: A leaf seal as a shaft seal mechanism is made compact and enables reduction of manufacturing cost. Plural thin plates 29 lapped one on another in layers have their outer circumferential proximal ends fixed to each other by welding so that an annular thin plate assembly 29A having a flexibility is formed. This thin plate assembly 29A is bent and assembled to form the leaf seal 25.
    Type: Application
    Filed: May 20, 2004
    Publication date: December 23, 2004
    Inventors: Takashi Nakano, Hirokazu Shirai, Toshio Asada, Shin Nishimoto, Tanehiro Shinohara, Hidekazu Uehara
  • Patent number: 6736597
    Abstract: The present invention reduces the amount of gas which leaks and flows from a high pressure side to a low pressure side of the axis and maintains good sealing performance even at high differential pressures. The invention discloses an axis sealing mechanism comprising casings which are supported inside of the stable portion, a plurality of planar plates, which are mutually spaced around the axis, each of which is fixed to the casings, positioned so that an inner end of each planar plate makes an acute angle with a peripheral surface of the axis and contacts the peripheral surface of the axis over a predetermined length in an axial direction, a high pressure side plate which is arranged at a high pressure side and a low pressure side plate which is arranged at a low pressure side so as to hold the planar plates therebetween and a flexible plate which is arranged between the planar plates and the high pressure side plate, and is flexible in an axial direction.
    Type: Grant
    Filed: October 8, 2002
    Date of Patent: May 18, 2004
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Hidekazu Uehara, Tanehiro Shinohara, Kouichi Akagi, Masanori Yuri, Shin Koga, Takashi Nakano, Shin Nishimoto
  • Patent number: 6688847
    Abstract: A shaft structure of a rotor tail end of a gas turbine in which a steam passage for supplying and recovering a steam for cooling rotor blades of the gas turbine extends along a center axis of the rotor assembly of the gas turbine is provided, wherein a center hole of the rotor tail end coaxial to the center axis of the steam passage is formed in the rotor tail end. Provision is also made of a thermal sleeve between the steam passage and the inner surface of the center hole of the rotor tail end, so that a thermal insulation gas layer is formed between the inner surface of the center hole of the rotor tail end and the thermal sleeve. The thermal insulation gas layer is isolated gas-tightly and liquid-tightly from the outside.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: February 10, 2004
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Takeaki Oya, Kazuharu Hirokawa, Tadateru Tanioka, Tanehiro Shinohara, Katsunori Tanaka, Kazuo Uematsu
  • Publication number: 20030068224
    Abstract: The present invention reduces the amount of gas which leaks and flows from a high pressure side to a low pressure side of the axis and maintains good sealing performance even at high differential pressures. The invention discloses an axis sealing mechanism comprising casings which are supported inside of the stable portion, a plurality of planar plates, which are mutually spaced around the axis, each of which is fixed to the casings, positioned so that an inner end of each planar plate makes an acute angle with a peripheral surface of the axis and contacts the peripheral surface of the axis over a predetermined length in an axial direction, a high pressure side plate which is arranged at a high pressure side and a low pressure side plate which is arranged at a low pressure side so as to hold the planar plates therebetween and a flexible plate which is arranged between the planar plates and the high pressure side plate, and is flexible in an axial direction.
    Type: Application
    Filed: October 8, 2002
    Publication date: April 10, 2003
    Applicant: MITSUBISHI HEAVY INDUSTRIES LTD.
    Inventors: Hidekazu Uehara, Tanehiro Shinohara, Kouichi Akagi, Masanori Yuri, Shin Koga, Takashi Nakano, Shin Nishimoto
  • Publication number: 20030062686
    Abstract: The shaft seal structure is based on a leaf seal 25 that includes springs, disposed between the stator blades 24a and the leaf seal ring 26, to force the leaf seal ring 26 away from the rotation shaft 23, and pressure guiding grooves 34 for guiding the fluid pressure, through a boundary of planar plates 28, to a space between the outer peripheral surface of the leaf seal ring 26 and the inner peripheral surface of the stator blade 24a. Also, a turbine may be provided with the leaf seal so as to reduce gas leakage from the high-pressure-region to the low-pressure-region as well as to control the frictional wear between the planar plates and the rotation shaft.
    Type: Application
    Filed: September 25, 2002
    Publication date: April 3, 2003
    Applicant: MITSUBISHI HEAVY INDUSTRIES LTD.
    Inventors: Hidekazu Uehara, Tanehiro Shinohara, Kouichi Akagi, Masanori Yuri, Takashi Nakano, Shin Nishimoto
  • Publication number: 20020117807
    Abstract: A shaft seal for a rotating machine having a rotating shaft includes a support ring, surrounding the shaft, supported by a casing. The support ring includes a plurality of movable ring segments and fixed ring segments adjoining each other in a circumferential direction of the support ring. The movable ring segments are biased away from the shaft by biasing members provided at circumferential ends of the fixed ring segments. Sealing fins and sealing sheets are disposed along the inner periphery of the support ring.
    Type: Application
    Filed: February 26, 2002
    Publication date: August 29, 2002
    Applicant: MITSUBISHI HEAVY INDUSTRIES LTD.
    Inventors: Zenichi Yoshida, Tanehiro Shinohara, Toshihiro Miyawaki, Tetsu Konishi, Takashi Nakano, Kenji Enomoto, Yutaka Toda
  • Publication number: 20020105146
    Abstract: An object of the present invention is to provide a shaft seal which reduces the leakage of gas from the high pressure side to the low pressure side, and has excellent corrosion-resistance, and a gas turbine which is equipped with the shaft seal; in order to achieve the object, the present invention provide a shaft seal comprising a plurality of flexible thin plates having width in the axial direction of a rotary shaft, tips thereof sliding against a peripheral face of said rotary shaft, and outer peripheral bases thereof being secured to a casing side maintaining a gap therebetween, said thin plates being laminated in the peripheral direction of said rotary shaft, enabling the outer periphery of said rotary shaft to be sealed, an acute angle being formed between the thin plates and the peripheral face of said rotary shaft; and a low pressure side side-plate and a high pressure side side-plate which are provided on both sides of said thin plates in the axial direction of said rotary shaft, wherein it further c
    Type: Application
    Filed: October 26, 2001
    Publication date: August 8, 2002
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Hidekazu Uehara, Tanehiro Shinohara, Kouichi Akagi, Masanori Yuri
  • Publication number: 20020037216
    Abstract: A shaft structure of a rotor tail end of a gas turbine in which a steam passage for supplying and recovering a steam for cooling rotor blades of the gas turbine extends along a center axis of the rotor assembly of the gas turbine is provided, wherein a center hole of the rotor tail end coaxial to the center axis of the steam passage is formed in the rotor tail end. Provision is also made of a thermal sleeve between the steam passage and the inner surface of the center hole of the rotor tail end, so that a thermal insulation gas layer is formed between the inner surface of the center hole of the rotor tail end and the thermal sleeve. The thermal insulation gas layer is isolated gas-tightly and liquid-tightly from the outside.
    Type: Application
    Filed: August 31, 2001
    Publication date: March 28, 2002
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Takeaki Oya, Kazuharu Hirokawa, Tadateru Tanioka, Tanehiro Shinohara, Katsunori Tanaka, Kazuo Uematsu
  • Patent number: 6343792
    Abstract: A shaft seal having a high abrasion resistance is disclosed, by which the leakage of the gas from the high-pressure side to the low-pressure side can be reduced. In the shaft seal, flexible leaves are multi-layered to form a ring shape. The shaft seal is mainly arranged around the rotation shaft of a gas turbine or the like. The relevant turbine comprises a casing, a compressor, a rotation shaft, moving blades attached to the rotation shaft, and stationary blades attached to the casing in a manner such that the stationary blades face the moving blades, wherein the shaft seals are provided between a plurality of stationary blades and the rotation shaft wherein the leaves of each shaft seal contact the rotation shaft. Under the rated operating conditions, the top ends of the leaves slightly separate from the surface of the rotation shaft due to the dynamic pressure generated by the rotation of the rotation shaft.
    Type: Grant
    Filed: March 13, 2000
    Date of Patent: February 5, 2002
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Tanehiro Shinohara, Kouichi Akagi, Masanori Yuri, Masahiko Toyoda, Yutaka Ozawa, Akihiro Kawaguchi, Setunori Sakakibara, Zenichi Yoshida, Nobuhiro Kunitake, Takahiro Ohta, Hidehiko Nakane, Eisaku Ito, Yutaka Kawata, Koji Takeshita