Patents by Inventor Sakae Kawasaki
Sakae Kawasaki 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: 8770939Abstract: In a turbine rotor blade assembly 1, a length h2 in the radial direction of a bucket dovetail 15 of a notch blade 10 is configured to be shorter than a length h3 in the radial direction of an effective blade portion 13 of a adjacent notch blade 30 and a length h4 in the radial direction of the bucket dovetail 15. Thus, during an insertion of the notch blade 10 in the axial direction, the rotational movement Rf around the radial direction and the circumferential movement of the notch blade 10 can be secured.Type: GrantFiled: July 9, 2010Date of Patent: July 8, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Tomohiko Tsukuda, Sakae Kawasaki, Hiroshi Kawakami
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Patent number: 8147180Abstract: An axial flow turbine stage structure has: an annular diaphragm inner ring; an annular diaphragm outer ring arranged radially outside and coaxially with the diaphragm inner ring and separated from the diaphragm inner ring by an annular flow path interposed between them; stationary blades arranged peripherally at intervals in the annular flow path and rigidly secured to the diaphragm inner ring and the diaphragm outer ring; and moving blades rigidly secured to the outer periphery of a rotatable rotor and arranged peripherally at intervals respectively at axially downstream sides of the stationary blades. Through holes are formed in the diaphragm outer ring so as to allow axial upstream side and axially downstream side of the stationary blades to communicate with each other.Type: GrantFiled: October 1, 2008Date of Patent: April 3, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Kentaro Tani, Sakae Kawasaki, Akihiro Onoda, Daisuke Nomura, Hiroshi Kawakami
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Publication number: 20110008173Abstract: In a turbine rotor blade assembly 1, a length h2 in the radial direction of a bucket dovetail 15 of a notch blade 10 is configured to be shorter than a length h3 in the radial direction of an effective blade portion 13 of a adjacent notch blade 30 and a length h4 in the radial direction of the bucket dovetail 15. Thus, during an insertion of the notch blade 10 in the axial direction, the rotational movement Rf around the radial direction and the circumferential movement of the notch blade 10 can be secured.Type: ApplicationFiled: July 9, 2010Publication date: January 13, 2011Inventors: Tomohiko Tsukuda, Sakae Kawasaki, Hiroshi Kawakami
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Patent number: 7645119Abstract: An axial flow turbine provided with a stage composed of a turbine nozzle and a turbine rotor blade arranged in an axial flow direction. Both end portions of a nozzle blade of the turbine nozzle are supported by a diaphragm inner ring and a diaphragm outer ring, and a flow passage is formed to have its diameter expanded from an upstream stage to a downstream stage. In such axial flow turbine, trailing edges at ends of the nozzle blade supported by the diaphragm inner ring and the diaphragm outer ring are curved as a curvature to an outlet side, and an intermediate portion between the trailing edges is formed to be straight.Type: GrantFiled: August 22, 2007Date of Patent: January 12, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Daisuke Nomura, Sakae Kawasaki, Akihiro Onoda, Kentaro Tani, Hiroshi Kawakami
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Publication number: 20090110550Abstract: An axial flow turbine stage structure has: an annular diaphragm inner ring; an annular diaphragm outer ring arranged radially outside and coaxially with the diaphragm inner ring and separated from the diaphragm inner ring by an annular flow path interposed between them; stationary blades arranged peripherally at intervals in the annular flow path and rigidly secured to the diaphragm inner ring and the diaphragm outer ring; and moving blades rigidly secured to the outer periphery of a rotatable rotor and arranged peripherally at intervals respectively at axially downstream sides of the stationary blades. Through holes are formed in the diaphragm outer ring so as to allow axial upstream side and axially downstream side of the stationary blades to communicate with each other.Type: ApplicationFiled: October 1, 2008Publication date: April 30, 2009Inventors: Kentaro TANI, Sakae Kawasaki, Akihiro Onoda, Daisuke Nomura, Hiroshi Kawakami
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Publication number: 20080199310Abstract: An axial flow turbine provided with a stage composed of a turbine nozzle and a turbine rotor blade arranged in an axial flow direction. Both end portions of a nozzle blade of the turbine nozzle are supported by a diaphragm inner ring and a diaphragm outer ring, and a flow passage is formed to have its diameter expanded from an upstream stage to a downstream stage. In such axial flow turbine, trailing edges at ends of the nozzle blade supported by the diaphragm inner ring and the diaphragm outer ring are curved as a curvature to an outlet side, and an intermediate portion between the trailing edges is formed to be straight.Type: ApplicationFiled: August 22, 2007Publication date: August 21, 2008Inventors: Daisuke Nomura, Sakae Kawasaki, Akihiro Onoda, Kentaro Tani, Hiroshi Kawakami
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Patent number: 7300247Abstract: An axial flow turbine provided with a stage composed of a turbine nozzle and a turbine rotor blade arranged in an axial flow direction. Both end portions of a nozzle blade of the turbine nozzle are supported by a diaphragm inner ring and a diaphragm outer ring, and a flow passage is formed to have its diameter expanded from an upstream stage to a downstream stage. In such axial flow turbine, trailing edges at ends of the nozzle blade supported by the diaphragm inner ring and the diaphragm outer ring are curved as a curvature to an outlet side, and an intermediate portion between the trailing edges is formed to be straight.Type: GrantFiled: March 30, 2006Date of Patent: November 27, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Daisuke Nomura, Sakae Kawasaki, Akihiro Onoda, Kentaro Tani, Hiroshi Kawakami
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Publication number: 20070086891Abstract: An axial flow turbine provided with a stage composed of a turbine nozzle and a turbine rotor blade arranged in an axial flow direction. Both end portions of a nozzle blade of the turbine nozzle are supported by a diaphragm inner ring and a diaphragm outer ring, and a flow passage is formed to have its diameter expanded from an upstream stage to a downstream stage. In such axial flow turbine, trailing edges at ends of the nozzle blade supported by the diaphragm inner ring and the diaphragm outer ring are curved as a curvature to an outlet side, and an intermediate portion between the trailing edges is formed to be straight.Type: ApplicationFiled: March 30, 2006Publication date: April 19, 2007Inventors: Daisuke Nomura, Sakae Kawasaki, Akihiro Onoda, Kentaro Tani, Hiroshi Kawakami
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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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Patent number: 6848884Abstract: An object of the present invention is to reduce the adverse effect of interference between stationary blades and moving blades on the performance of an axial-flow turbine and to provide a high-performance turbine stage. Each of the stationary blades has a trailing edge convex toward a face side with respect to a radial line radially extending from the axis of the rotor shaft, and the each of the moving blades has a blade center-of-gravity line convex toward the face side with respect to a radial line radially extending from the axis of the rotor shaft, and shapes of the stationary blades and the moving blades meet conditions expressed by: 1<?nr/?nt 1<?bt/?br where, ?nt and ?nr are angles between the stationary blade tip and the stationary blade root, and radial lines, and ?bt and ?br are angles between the blade center-of-gravity line of the moving blade at the tip of the same, and the blade center-of-gravity line of the moving blade at the tip of the moving blade, and radial lines.Type: GrantFiled: February 9, 2001Date of Patent: February 1, 2005Assignee: Kabushiki Kaisha ToshibaInventor: Sakae Kawasaki
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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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Publication number: 20030143068Abstract: An object of the present invention is to reduce the adverse effect of interference between stationary blades and moving blades on the performance of an axial-flow turbine and to provide a high-performance turbine stage.Type: ApplicationFiled: December 12, 2002Publication date: July 31, 2003Inventor: Sakae Kawasaki
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Patent number: 6079948Abstract: A blade for an axial fluid machine comprises an effective blade portion having a root portion and a tip portion and projecting blade portions. The projecting blade portions are defined by axis reference lines extending to an upstream side with respect to a fluid flow from at least one of the root portion and the tip portion of the effective blade portion and by axes obliquely extending from ends of the axis reference lines toward a leading edge of the effective blade portion. The projecting blade portions are formed continuously to and integrally with the leading edge of the effective blade portion so that the effective blade portion and the projecting blade portions have substantially the same maximum blade thickness.Type: GrantFiled: September 30, 1997Date of Patent: June 27, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Takashi Sasaki, Kenichi Okuno, Sakae Kawasaki