Patents by Inventor Tadashi Tanuma
Tadashi Tanuma 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: 9309773Abstract: A steam turbine 3 includes: a turbine rotor 4; a rotor blade 5 implanted to the turbine rotor 4; a stator blade 6 provided at an upstream side of the rotor blade 5; and a turbine casing 13 supporting the stator blade 6 and including the turbine rotor 4, the rotor blade 5 and the stator blade 6, and have a constitution in which a stage 7 is formed by a pair of the rotor blade 5 and the stator blade 6, and a steam passage 8 is formed by arranging plural stages 7 in an axial direction of the turbine rotor 4. A surface treatment to suppress an increase of a surface roughness caused by oxidation is performed for at least a part of a surface of the stator blade 6 and a surface of the rotor blade 5.Type: GrantFiled: December 23, 2010Date of Patent: April 12, 2016Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Akio Sayano, Masashi Takahashi, Masahiro Saito, Kazuyoshi Nakajima, Tadashi Tanuma, Satoru Asai, Kenji Kamimura
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Publication number: 20110150641Abstract: A steam turbine 3 includes: a turbine rotor 4; a rotor blade 5 implanted to the turbine rotor 4; a stator blade 6 provided at an upstream side of the rotor blade 5; and a turbine casing 13 supporting the stator blade 6 and including the turbine rotor 4, the rotor blade 5 and the stator blade 6, and have a constitution in which a stage 7 is formed by a pair of the rotor blade 5 and the stator blade 6, and a steam passage 8 is formed by arranging plural stages 7 in an axial direction of the turbine rotor 4. A surface treatment to suppress an increase of a surface roughness caused by oxidation is performed for at least a part of a surface of the stator blade 6 and a surface of the rotor blade 5.Type: ApplicationFiled: December 23, 2010Publication date: June 23, 2011Applicant: Kabushiki Kaisha ToshibaInventors: Akio SAYANO, Masashi Takahashi, Masahiro Saito, Kazuyoshi Nakajima, Tadashi Tanuma, Satoru Asai, Kenji Kamimura
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Patent number: 7455570Abstract: The present invention comprises a turntable which holds a turbine part at a predetermined position, the turn table being rotatably supported by a support member, and rotated and driven by a driving motor, an abrasive feeding unit which feeds an abrasive particle having an elastic material as a core to a predetermined position as an abrasive, and a polishing head including an impeller which is rotated and driven by an impeller driving motor at high speed and applies rotary energy to the abrasive particle to be supplied from the abrasive feeding unit, the polishing head injecting the abrasive particle flying from the tangential direction of the impeller at a predetermined speed toward a surface to be polished of the turbine part held on the turntable, and an abrasive recovery unit which recovers the abrasive particle provided for polishing of the turbine part from the polishing head, and feeding into the abrasive feeding unit.Type: GrantFiled: December 22, 2005Date of Patent: November 25, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Satoru Yanaka, Satoru Asai, Ryusuke Tsuboi, Kenji Kamimura, Tadashi Tanuma, Masataka Kikuchi
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Patent number: 7144303Abstract: A surface to be polished of a large part is polished by projecting and colliding an abrasive comprising abrasive grains and an elastic petrochemical high polymer material having the specific gravity of 0.5 to 1.8 g/cm3 and elasticity of 10 to 200 ckg/cm2 or an elastic natural material, to the surface to be polished of the large part at a speed of 600 m to 3800 m per minute and by a volume of 5 to 300 cc/cm2·sec per unit area, and sliding the abrasive.Type: GrantFiled: December 21, 2005Date of Patent: December 5, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Kenji Kamimura, Satoru Asai, Satoru Yanaka, Ryusuke Tsuboi, Tadashi Tanuma, Masataka Kikuchi
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Publication number: 20060111025Abstract: The present invention comprises a turntable which holds a turbine part at a predetermined position, the turn table being rotatably supported by a support member, and rotated and driven by a driving motor, an abrasive feeding unit which feeds an abrasive particle having an elastic material as a core to a predetermined position as an abrasive, and a polishing head including an impeller which is rotated and driven by an impeller driving motor at high speed and applies rotary energy to the abrasive particle to be supplied from the abrasive feeding unit, the polishing head injecting the abrasive particle flying from the tangential direction of the impeller at a predetermined speed toward a surface to be polished of the turbine part held on the turntable, and an abrasive recovery unit which recovers the abrasive particle provided for polishing of the turbine part from the polishing head, and feeding into the abrasive feeding unit.Type: ApplicationFiled: December 22, 2005Publication date: May 25, 2006Inventors: Satoru Yanaka, Satoru Asai, Ryusuke Tsuboi, Kenji Kamimura, Tadashi Tanuma, Masataka Kikuchi
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Publication number: 20060111023Abstract: A surface to be polished of a large part is polished by projecting and colliding an abrasive comprising abrasive grains and an elastic petrochemical high polymer material having the specific gravity of 0.5 to 1.8 g/cm3 and elasticity of 10 to 200 ckg/cm2 or an elastic natural material, to the surface to be polished of the large part at a speed of 600 m to 3800 m per minute and by a volume of 5 to 300 cc/cm2·sec per unit area, and sliding the abrasive.Type: ApplicationFiled: December 21, 2005Publication date: May 25, 2006Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Kenji Kamimura, Satoru Asai, Satoru Yanaka, Ryusuke Tsuboi, Tadashi Tanuma, Masataka Kikuchi
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Patent number: 7048509Abstract: In the axial turbine according to the present invention, a nozzle blade 1 and/or a movable blade 5 has a profile in which a throat-pitch ratio “s/t” is maximized at a blade-central portion in height, wherein “s” being a shortest distance between a rear edge of a nozzle blade (movable blade) and a back side of another nozzle blade that is adjacent to the nozzle blade, and “t” being a pitch of the nozzle blades disposed in the row, minimized in a position between the blade-central portion in height and a blade-root portion and increased from a minimized value to the blade-root portion. This structure enables to provide the axial turbine, which permits to control flow distribution of the working fluid in the height direction of the blade in the passage between the blades of a turbine nozzle unit and a turbine movable nozzle and reduce the blade profile loss and the secondary flow loss at the blade-root portion, thus making a further improvement in the turbine stage efficiency.Type: GrantFiled: August 29, 2002Date of Patent: May 23, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Junichi Tominaga, Sakae Kawasaki, Tadashi Tanuma, Kenichi Imai
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Publication number: 20050019157Abstract: In the axial turbine according to the present invention, a nozzle blade 1 and/or a movable blade 5 has a profile in which a throat-pitch ratio “s/t” is maximized at a blade-central portion in height, wherein “s” being a shortest distance between a rear edge of a nozzle blade (movable blade) and a back side of another nozzle blade that is adjacent to the nozzle blade, and “t” being a pitch of the nozzle blades disposed in the row, minimized in a position between the blade-central portion in height and a blade-root portion and increased from a minimized value to the blade-root portion. This structure enables to provide the axial turbine, which permits to control flow distribution of the working fluid in the height direction of the blade in the passage between the blades of a turbine nozzle unit and a turbine movable nozzle and reduce the blade profile loss and the secondary flow loss at the blade-root portion, thus making a further improvement in the turbine stage efficiency.Type: ApplicationFiled: August 29, 2002Publication date: January 27, 2005Inventors: Junichi Tominaga, Sakae Kawasaki, Tadashi Tanuma, Kenichi Imai
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Patent number: 6769869Abstract: A steam turbine that passes more turbine driving steam by off-setting the turbine moving blade throat•pitch ratio before operation and, when a blade untwist is generated during operation, causing more turbine driving steam to flow by maintaining an appropriate value, and, at the same time causing the turbine moving blade throat•pitch ratio to swell by giving the blade untwisting angle to the blade cross-sections in regions where the aerodynamic loss is small. The steam turbine is one in which the throat•pitch ratio (S/T) distribution of a turbine moving blade is offset by forming a curve providing at least one minimal value and maximal value by giving blade twist angle to the blade cross-sections in the blade height direction from blade root to blade tip and, at the same time, the distribution of throat•pitch ratio (S/T) taking into consideration blade untwist generated during operation.Type: GrantFiled: December 26, 2001Date of Patent: August 3, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Tadashi Tanuma, Taro Sakamoto
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Publication number: 20020054817Abstract: A steam turbine that passes more turbine driving steam by off-setting the turbine moving blade throat.pitch ratio before operation and, when a blade untwist is generated during operation, causing more turbine driving steam to flow by maintaining an appropriate value, and, at the same time causing the turbine moving blade throat.pitch ratio to swell by giving the blade untwisting angle to the blade cross-sections in regions where the aerodynamic loss is small. The steam turbine is one in which the throat.pitch ratio (S/T) distribution of a turbine moving blade is offset by forming a curve providing at least one minimal value and maximal value by giving blade twist angle to the blade cross-sections in the blade height direction from blade root to blade tip and, at the same time, the distribution of throat.pitch ratio (S/T) taking into consideration blade untwist generated during operation.Type: ApplicationFiled: December 26, 2001Publication date: May 9, 2002Applicant: Kabushiki Kaisha ToshibaInventors: Tadashi Tanuma, Taro Sakamoto
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Publication number: 20020048514Abstract: A steam turbine that passes more turbine driving steam by off-setting the turbine moving blade throat•pitch ratio before operation and, when a blade untwist is generated during operation, causing more turbine driving steam to flow by maintaining an appropriate value, and, at the same time causing the turbine moving blade throat•pitch ratio to swell by giving the blade untwisting angle to the blade cross-sections in regions where the aerodynamic loss is small. The steam turbine is one in which the throat•pitch ratio (S/T) distribution of a turbine moving blade is offset by forming a curve providing at least one minimal value and maximal value by giving blade twist angle to the blade cross-sections in the blade height direction from blade root to blade tip and, at the same time, the distribution of throat•pitch ratio (S/T) taking into consideration blade untwist generated during operation.Type: ApplicationFiled: December 26, 2001Publication date: April 25, 2002Applicant: Kabushiki Kaisha ToshibaInventors: Tadashi Tanuma, Taro Sakamoto
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Patent number: 6375420Abstract: A steam turbine that passes more turbine driving steam by off-setting the turbine moving blade throat-pitch ratio before operation and, when a blade untwist is generated during operation, causing more turbine driving steam to flow by maintaining an appropriate value, and, at the same time causing the turbine moving blade throat-pitch ratio to swell by giving the blade untwisting angle to the blade cross-sections in regions where the aerodynamic loss is small. The steam turbine is one in which the throat-pitch ratio (S/T) distribution of a turbine moving blade is offset by forming a curve providing at least one minimal value and maximal value by giving blade twist angle to the blade cross-sections in the blade height direction from blade root to blade tip and, at the same time, the distribution of throat-pitch ratio (S/T) taking into consideration blade untwist generated during operation.Type: GrantFiled: July 27, 1999Date of Patent: April 23, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Tadashi Tanuma, Taro Sakamoto