Patents by Inventor Itaru Murakami
Itaru Murakami 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).
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Patent number: 9732627Abstract: According to an embodiment, a rotor blade cover section is integrated with the rotor blades at leading ends thereof. A plurality of sealing fins is disposed at the rotor blade cover section, the sealing fins forming a predetermined clearance relative to an inner peripheral portion of the nozzle outer ring. An annular solid particle trapping space is disposed at the inner peripheral portion of the nozzle outer ring, the solid particle trapping space communicating with an inlet of a steam leak and trapping solid particles that flow in with steam. In the sealing structure, the nozzle outer ring has a through hole through which the solid particles are to be discharged from the solid particle trapping space toward a downstream stage of the steam turbine.Type: GrantFiled: July 31, 2013Date of Patent: August 15, 2017Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Kenichi Okuno, Yoshifumi Iwasaki, Yoriharu Murata, Toshio Hirano, Itaru Murakami, Shinichiro Ohashi
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Patent number: 9506354Abstract: A turbine rotor blade of the embodiment is made up of plural rotor blades each including: a blade effective part, a blade planting part, and a cover part, in which the cover parts adjacent in a turbine rotor circumferential direction are engaged with each other to make up an annular blade cascade. From among the rotor blades, a cover part of a stopping blade implanted to a planting part of the turbine rotor or the cover part of at least one of the rotor blades engaged with the cover part of the stopping blade is formed at the blade top part of the rotor blade so as to be able to be fitted when the rotor blade is installed in the turbine rotor.Type: GrantFiled: November 22, 2013Date of Patent: November 29, 2016Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Norimichi Mori, Itaru Murakami, Tsutomu Yoshihara
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Patent number: 9359907Abstract: A stationary blade cascade 29 of an embodiment includes stationary blade structures 50 and a ring-shaped support structure 40 supporting the stationary blade structures 50. The stationary blade structures 50 each include: a stationary blade part 51 where steam passes; and an outer circumference side constituent part 52 formed on an outer circumference side of the stationary blade part 51 and having a fitting groove 56 which penetrates all along a circumferential direction and which has an opening 55 all along the circumferential direction in a downstream end surface 54 of the outer circumference side constituent part 52. The support structure 40 includes a ring-shaped support part 42 having a fitting portion 41 fitted in the fitting grooves 56 of the outer circumference side constituent parts 52. The plural stationary blade structures 50 are supported along the circumferential direction by the ring-shaped support part 42.Type: GrantFiled: November 28, 2012Date of Patent: June 7, 2016Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Tsuguhisa Tashima, Itaru Murakami, Motoki Yoshikawa
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Patent number: 9034121Abstract: A low alloy steel ingot contains from 0.15 to 0.30% of C, from 0.03 to 0.2% of Si, from 0.5 to 2.0% of Mn, from 0.1 to 1.3% of Ni, from 1.5 to 3.5% of Cr, from 0.1 to 1.0% of Mo, and more than 0.15 to 0.35% of V, and optionally Ni, with a balance being Fe and unavoidable impurities. Performing quality heat treatment including a quenching step and a tempering step to the low alloy steel ingot to obtain a material, which has a grain size number of from 3 to 7 and is free from pro-eutectoid ferrite in a metallographic structure thereof, and which has a tensile strength of from 760 to 860 MPa and a fracture appearance transition temperature of not higher than 40° C.Type: GrantFiled: April 17, 2012Date of Patent: May 19, 2015Assignees: THE JAPAN STEEL WORKS,LTD., KABUSHIKI KAISHA TOSHIBAInventors: Satoru Ohsaki, Kazuhiro Miki, Tsukasa Azuma, Koji Kajikawa, Shigeru Suzuki, Masayuki Yamada, Itaru Murakami, Kenichi Okuno, Liang Yan, Reki Takaku, Akihiro Taniguchi, Tetsuya Yamanaka, Makoto Takahashi, Kenichi Imai, Osamu Watanabe, Joji Kaneko
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Publication number: 20140079551Abstract: A turbine rotor blade of the embodiment is made up of plural rotor blades each including: a blade effective part, a blade planting part, and a cover part, in which the cover parts adjacent in a turbine rotor circumferential direction are engaged with each other to make up an annular blade cascade. From among the rotor blades, a cover part of a stopping blade implanted to a planting part of the turbine rotor or the cover part of at least one of the rotor blades engaged with the cover part of the stopping blade is formed at the blade top part of the rotor blade so as to be able to be fitted when the rotor blade is installed in the turbine rotor.Type: ApplicationFiled: November 22, 2013Publication date: March 20, 2014Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Norimichi Mori, Itaru Murakami, Tsutomu Yoshihara
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Publication number: 20140037431Abstract: According to an embodiment, a rotor blade cover section is integrated with the rotor blades at leading ends thereof. A plurality of sealing fins is disposed at the rotor blade cover section, the sealing fins forming a predetermined clearance relative to an inner peripheral portion of the nozzle outer ring. An annular solid particle trapping space is disposed at the inner peripheral portion of the nozzle outer ring, the solid particle trapping space communicating with an inlet of a steam leak and trapping solid particles that flow in with steam. In the sealing structure, the nozzle outer ring has a through hole through which the solid particles are to be discharged from the solid particle trapping space toward a downstream stage of the steam turbine.Type: ApplicationFiled: July 31, 2013Publication date: February 6, 2014Applicant: Kabushiki Kaisha ToshibaInventors: Kenichi OKUNO, Yoshifumi Iwasaki, Yoriharu Murata, Toshio Hirano, Itaru Murakami, Shinichiro Ohashi
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Publication number: 20130149136Abstract: A stationary blade cascade 29 of an embodiment includes stationary blade structures 50 and a ring-shaped support structure 40 supporting the stationary blade structures 50. The stationary blade structures 50 each include: a stationary blade part 51 where steam passes; and an outer circumference side constituent part 52 formed on an outer circumference side of the stationary blade part 51 and having a fitting groove 56 which penetrates all along a circumferential direction and which has an opening 55 all along the circumferential direction in a downstream end surface 54 of the outer circumference side constituent part 52. The support structure 40 includes a ring-shaped support part 42 having a fitting portion 41 fitted in the fitting grooves 56 of the outer circumference side constituent parts 52. The plural stationary blade structures 50 are supported along the circumferential direction by the ring-shaped support part 42.Type: ApplicationFiled: November 28, 2012Publication date: June 13, 2013Inventors: Tsuguhisa TASHIMA, Itaru Murakami, Motoki Yoshikawa
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Patent number: 8431859Abstract: A stress treatment device has an operating unit including a head unit performing peening by irradiating an inside of a hole formed in a structure with laser to form a compressive stress region in the hole; a laser unit having an optical fiber guiding the laser to the head unit; a jetting unit jetting liquid into the hole; and a support part supporting the optical fiber in a manner of allowing the jetted liquid to flow through and being fixed in the head unit.Type: GrantFiled: November 23, 2011Date of Patent: April 30, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Hidekazu Sasaki, Itaru Chida, Itaru Murakami, Hiroshi Nomura
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Publication number: 20120261038Abstract: A low alloy steel ingot contains from 0.15 to 0.30% of C, from 0.03 to 0.2% of Si, from 0.5 to 2.0% of Mn, from 0.1 to 1.3% of Ni, from 1.5 to 3.5% of Cr, from 0.1 to 1.0% of Mo, and more than 0.15 to 0.35% of V, and optionally Ni, with a balance being Fe and unavoidable impurities. Performing quality heat treatment including a quenching step and a tempering step to the low alloy steel ingot to obtain a material, which has a grain size number of from 3 to 7 and is free from pro-eutectoid ferrite in a metallographic structure thereof, and which has a tensile strength of from 760 to 860 MPa and a fracture appearance transition temperature of not higher than 40 ° C.Type: ApplicationFiled: April 17, 2012Publication date: October 18, 2012Applicants: KABUSHIKI KAISHA TOSHIBA, THE JAPAN STEEL WORKS, LTD.Inventors: Satoru OHSAKI, Kazuhiro MIKI, Tsukasa AZUMA, Koji KAJIKAWA, Shigeru SUZUKI, Masayuki YAMADA, Itaru MURAKAMI, Kenichi OKUNO, Liang YAN, Reki TAKAKU, Akihiro TANIGUCHI, Tetsuya YAMANAKA, Makoto TAKAHASHI, Kenichi IMAI, Osamu WATANABE, Joji KANEKO
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Patent number: 8257046Abstract: A turbine rotor blade according to the present invention includes a cover provided at the top of an effective blade portion and a blade-fitting portion provided at the bottom of the effective blade portion. A turbine wheel is provided with a turbine-wheel engagement portion to which the blade-fitting portion is fittable. The turbine rotor blade is a portion of a blade array structure formed by arranging the cover and a neighboring cover in contact with each other. The blade-fitting portion is provided with an anti-twist segment, and the turbine-wheel engagement portion is provided with an untwist restraining segment engageable to the anti-twist segment.Type: GrantFiled: November 28, 2006Date of Patent: September 4, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Kazuhiro Saito, Itaru Murakami, Kenichi Okuno
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Publication number: 20120125897Abstract: A stress treatment device has an operating unit including a head unit performing peening by irradiating an inside of a hole formed in a structure with laser to form a compressive stress region in the hole; a laser unit having an optical fiber guiding the laser to the head unit; a jetting unit jetting liquid into the hole; and a support part supporting the optical fiber in a manner of allowing the jetted liquid to flow through and being fixed in the head unit.Type: ApplicationFiled: November 23, 2011Publication date: May 24, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Hidekazu SASAKI, Itaru CHIDA, Itaru MURAKAMI, Hiroshi NOMURA
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Publication number: 20090308847Abstract: A method is provided, which ensures reliability during manufacture and in the use environment, and allows affording erosion prevention capability in an inexpensive manner, to an erosion-susceptible portion such as turbine rotor blades. An erosion preventive section 4, comprising a lower layer (low-hardness layer) 2 of an austenitic material, and an upper layer (hard layer) 3 of a hard material, such as stellite, harder than the low-hardness layer 2, is formed by laser build-up welding on a portion, which is susceptible to erosion caused by liquid droplets and solid particles in a use environment, of a target member 1 such as a turbine rotor blade. Laser build-up welding is carried out through irradiation of a laser beam from a laser light source 6 while a welding material supply means 5 supplies an austenitic material and a hard material in the form of, for instance, a rod, powder or the like.Type: ApplicationFiled: August 2, 2007Publication date: December 17, 2009Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Kenji Kamimura, Katsunori Shiihara, Itaru Murakami, Satoru Asai
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Publication number: 20090246029Abstract: A turbine rotor blade according to the present invention includes a cover provided at the top of an effective blade portion and a blade-fitting portion provided at the bottom of the effective blade portion. A turbine wheel is provided with a turbine-wheel engagement portion to which the blade-fitting portion is fittable. The turbine rotor blade is a portion of a blade array structure formed by arranging the cover and a neighboring cover in contact with each other. The blade-fitting portion is provided with an anti-twist segment, and the turbine-wheel engagement portion is provided with an untwist restraining segment engageable to the anti-twist segment.Type: ApplicationFiled: November 28, 2006Publication date: October 1, 2009Inventors: Kazuhiro Saito, Itaru Murakami, Kenichi Okuno
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Patent number: 6682306Abstract: The moving blades are configured so as to meet a condition: (L+3D)×f≧14,500 or L×(L+D)×f2≧1.55×107, where L is an effective length of the moving blade measured in inches, D is a blade root circle diameter of the moving blades measured in inches, and f is the rated operating speed of the turbine measured in Hz. The moving blades are formed of a titanium alloy. The dovetail has an Christmas-tree shape, and is a curved-axial-entry. The moving blades are configured and arranged so as to meet a condition: 3.5≦P/W≦7.0 or 0.8≦P/C≦1.0, where W is a width of a section of a tip of the moving blade measured along an axis of the rotor wheel, P is pitch of the moving blades, and C is a chord length of the tip section of the moving blade. Adjacent moving blades are connected to each other in such a manner that the adjacent moving blades being capable of relative movement while the adjacent moving blades being connected to each other.Type: GrantFiled: August 29, 2002Date of Patent: January 27, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Itaru Murakami, Toshio Suzuki, Kenichi Okuno, Ryou Oda
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Publication number: 20030049131Abstract: The moving blades are configured so as to meet a condition: (L+3D)×f≧14,500 or L×(L+D)×f2≧1.55×107, where L is an effective length of the moving blade measured in inches, D is a blade root circle diameter of the moving blades measured in inches, and f is the rated operating speed of the turbine measured in Hz. The moving blades are formed of a titanium alloy. The dovetail has an Christmas-tree shape, and is a curved-axial-entry. The moving blades are configured and arranged so as to meet a condition: 3.5≦P/W≦7.0 or 0.8≦P/C≦1.0, where w is a width of a section of a tip of the moving blade measured along an axis of the rotor wheel, P is pitch of the moving blades, and C is a chord length of the tip section of the moving blade. Adjacent moving blades are connected to each other in such a manner that the adjacent moving blades being capable of relative movement while the adjacent moving blades being connected to each other.Type: ApplicationFiled: August 29, 2002Publication date: March 13, 2003Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Itaru Murakami, Toshio Suzuki, Kenichi Okuno, Ryou Oda
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Patent number: 5455777Abstract: An apparatus for predicting a deterioration and damage in a structural member of a prime mover or the like has a use condition monitoring unit for monitoring a condition of use of the structural member, an inspection unit for inspecting a deteriorated and damaged state of the structural member, a use condition setting unit for setting a use condition by being supplied with use condition data of the structural member from the use condition monitoring unit, a simulation unit for forming a model of the deterioration and damage in the structural member on the basis of the use condition of the structural member and a result of inspection of the structural member at a preceding time, and for simulating the advancement of the deterioration and damage in the structural member on the basis of the deterioration/damage model, and an inverse analysis unit for correcting a simulation model formed by the simulation unit by comparing the simulation model with a result of inspection of the structural member at the present tiType: GrantFiled: November 19, 1993Date of Patent: October 3, 1995Assignee: Kabushiki Kaisha ToshibaInventors: Kazunari Fujiyama, Itaru Murakami, Yomei Yoshioka, Nagatoshi Okabe
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Patent number: 5403428Abstract: The present invention relates to a method and apparatus for producing communication articles such as postcards, envelopes or the like in each of which display surfaces for information or the like are separably bonded with a synthetic resin therebetween by heating for concealing information such as correspondence or a printed display medium and then mailing it. It is an object of the invention to enable easy and smooth separating of a film-containing sheet and accurate insertion of a film in a sheet.Type: GrantFiled: October 11, 1991Date of Patent: April 4, 1995Assignee: Toyo Shokuhin Kikai Kabushiki KaishaInventors: Hiromichi Shingo, Yukio Sasayama, Itaru Murakami, Yukio Kii, Eiji Yonekura