Patents by Inventor Tomohiko Tsukuda
Tomohiko Tsukuda 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: 11867071Abstract: In one embodiment, a turbine monitoring system includes a temperature measurer configured to sense a temperature of steam to be introduced to a steam turbine, and output a sensing result of the temperature. The system further includes an electrical output measurer configured to sense an electrical output of a generator driven by the steam turbine, and output a sensing result of the electrical output. The system further includes a computing module configured to compute an erosion quantity of a moving vane of the steam turbine with water drops, based on the sensing result of the temperature that is output from the temperature measurer and the sensing result of the electrical output that is output from the electrical output measurer. The system further includes an outputting module configured to output information that is based on the erosion quantity computed by the computing module.Type: GrantFiled: January 18, 2023Date of Patent: January 9, 2024Assignee: Toshiba Energy Systems & Solutions CorporationInventors: Tomohiko Tsukuda, Yasuteru Kawai, Yukio Kanehira, Tsuguhisa Tashima
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Patent number: 11136897Abstract: A seal device according to the embodiment includes a seal fin provided between the rotation body and the stationary body and extending in a circumferential direction of the rotation body, and a swirl brake fin provided on the stationary body upstream of the seal fin. The swirl brake fin reduces a circumferential velocity component of the working fluid. The swirl brake fin has a negative pressure surface provided on a side of a rotation direction of the rotation body and a positive pressure surface provided on an opposite side to the negative pressure surface. The positive pressure surface extends in a direction opposite to the rotation direction of the rotation body from radially outward toward radially inward.Type: GrantFiled: August 2, 2019Date of Patent: October 5, 2021Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATIONInventor: Tomohiko Tsukuda
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Publication number: 20210172343Abstract: In one embodiment, a turbine monitoring system includes one or more measurers configured to sense a physical quantity of steam to be introduced to a steam turbine or exhausted from the steam turbine or water obtained from the steam exhausted from the steam turbine, and output a sensing result of the physical quantity. The system further includes a computing module configured to compute an erosion quantity of a moving vane of the steam turbine with water drops, based on the sensing result output from the one or more measurers. The system further includes a displaying module configured to display information that is based on the erosion quantity computed by the computing module.Type: ApplicationFiled: December 7, 2020Publication date: June 10, 2021Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATIONInventors: Tomohiko TSUKUDA, Tsuguhisa TASHIMA
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Publication number: 20200040752Abstract: A seal device according to the embodiment includes a seal fin provided between the rotation body and the stationary body and extending in a circumferential direction of the rotation body, and a swirl brake fin provided on the stationary body upstream of the seal fin. The swirl brake fin reduces a circumferential velocity component of the working fluid. The swirl brake fin has a negative pressure surface provided on a side of a rotation direction of the rotation body and a positive pressure surface provided on an opposite side to the negative pressure surface. The positive pressure surface extends in a direction opposite to the rotation direction of the rotation body from radially outward toward radially inward.Type: ApplicationFiled: August 2, 2019Publication date: February 6, 2020Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATIONInventor: Tomohiko TSUKUDA
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Patent number: 9850781Abstract: A steam turbine 10 according to an embodiment includes rotor blades 22 implanted to a turbine rotor 21, stationary blades 26 making up a turbine stage together with the rotor blades 22, diaphragm outer rings 23 including an annular extending part 24 surrounding a periphery of the rotor blades 22, and supporting the stationary blades 26, and diaphragm inner rings 25 supporting the stationary blades 26. The steam turbine 10 further includes an annular slit 40 formed at an inner surface of the diaphragm outer ring 23 between the stationary blades 26 and the rotor blades 22 along a circumferential direction, and communication holes 50 provided in plural at an outer surface of the diaphragm outer ring 23 along the circumferential direction, communicated to the annular slit 40 from the outer surface side, and communicated to an exhaust chamber sucking water films via the annular slit 40.Type: GrantFiled: June 26, 2014Date of Patent: December 26, 2017Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Naoki Shibukawa, Tomohiko Tsukuda, Junichi Tominaga, Shinichiro Ohashi
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Patent number: 9777587Abstract: A sealing device for a turbine has a sealing member provided in a gap between a rotor and a stator arranged to surround the rotor, and a fluid path provided within the stator, to introduce, into the stator, a cooling medium used to cool stationary blades extending radially inward from the stator, and to flow the cooling medium at least to an upstream side of the sealing member.Type: GrantFiled: March 4, 2013Date of Patent: October 3, 2017Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Yuki Mimura, Akihiro Onoda, Tomohiko Tsukuda, Naoki Shibukawa, Toshio Hirano, Iwataro Sato, Kazutaka Tsuruta
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Publication number: 20150003969Abstract: A steam turbine 10 according to an embodiment includes rotor blades 22 implanted to a turbine rotor 21, stationary blades 26 making up a turbine stage together with the rotor blades 22, diaphragm outer rings 23 including an annular extending part 24 surrounding a periphery of the rotor blades 22, and supporting the stationary blades 26, and diaphragm inner rings 25 supporting the stationary blades 26. The steam turbine 10 further includes an annular slit 40 formed at an inner surface of the diaphragm outer ring 23 between the stationary blades 26 and the rotor blades 22 along a circumferential direction, and communication holes 50 provided in plural at an outer surface of the diaphragm outer ring 23 along the circumferential direction, communicated to the annular slit 40 from the outer surface side, and communicated to an exhaust chamber sucking water films via the annular slit 40.Type: ApplicationFiled: June 26, 2014Publication date: January 1, 2015Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Naoki SHIBUKAWA, Tomohiko Tsukuda, Junichi Tominaga, Shinichiro Ohashi
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Patent number: 8806874Abstract: An axial-flow turbine has turbine nozzles, a heat shield plate, a first communication hole formed in the turbine rotor and connected to the space, to flow a cooling medium, a first opening formed in at least any one of the two adjacent rotor disks, to be connected to the space, a second communication hole connected to the space through the first opening, to communicate with an implant unit of the turbine rotor blade in the rotor disk, a third communication hole connected to the second communication hole, to communicate along an effective length of the turbine rotor blade, a second opening formed in a side face of the turbine rotor blade, to be connected to the third communication hole, and a third opening formed in an outer circumferential end face of the turbine rotor blade, to be connected to the third communication hole.Type: GrantFiled: March 4, 2013Date of Patent: August 19, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Akihiro Onoda, Yuki Mimura, Tomohiko Tsukuda, Iwataro Sato, Kazutaka Tsuruta
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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: 8695345Abstract: In one embodiment, a calculation method of moisture loss in a steam turbine calculates first a wetness fraction at the inlet and outlet of each of stationary blade cascades and rotor blade cascades. Subsequently, the moisture loss is classified into (1) supersaturation loss, (2) condensation loss, (3) acceleration loss, (4) braking loss, (5) capture loss and (6) pumping loss, and a loss for calculation of the moisture loss is selected from the above losses (1) to (6) according to the wetness fraction of steam at the inlet and outlet of each blade cascade. An amount of each selected loss is calculated, and an amount of moisture loss at each blade cascade is calculated.Type: GrantFiled: September 13, 2011Date of Patent: April 15, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Hiroyuki Kawagishi, Akihiro Onoda, Tomohiro Tejima, Tomohiko Tsukuda, Asako Inomata, Naoki Shibukawa
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Publication number: 20140020359Abstract: A sealing device for a turbine has a sealing member provided in a gap between a rotor and a stator arranged to surround the rotor, and a fluid path provided within the stator, to introduce, into the stator, a cooling medium used to cool stationary blades extending radially inward from the stator, and to flow the cooling medium at least to an upstream side of the sealing member.Type: ApplicationFiled: March 4, 2013Publication date: January 23, 2014Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yuki MIMURA, Akihiro ONODA, Tomohiko TSUKUDA, Naoki SHIBUKAWA, Toshio HIRANO, Iwataro SATO, Kazutaka TSURUTA
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Publication number: 20140020391Abstract: An axial-flow turbine has turbine nozzles, a heat shield plate, a first communication hole formed in the turbine rotor and connected to the space, to flow a cooling medium, a first opening formed in at least any one of the two adjacent rotor disks, to be connected to the space, a second communication hole connected to the space through the first opening, to communicate with an implant unit of the turbine rotor blade in the rotor disk, a third communication hole connected to the second communication hole, to communicate along an effective length of the turbine rotor blade, a second opening formed in a side face of the turbine rotor blade, to be connected to the third communication hole, and a third opening formed in an outer circumferential end face of the turbine rotor blade, to be connected to the third communication hole.Type: ApplicationFiled: March 4, 2013Publication date: January 23, 2014Applicant: Kabushiki Kaisha ToshibaInventors: Akihiro ONODA, Yuki Mimura, Tomohiko Tsukuda, Iwataro Sato, Kazutaka Tsuruta
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Publication number: 20140020403Abstract: In one embodiment, a sealing device includes seal fins provided on an inner circumferential surface of a stationary body or an outer circumferential surface of a rotating body so as to be adjacent to each other in an axial direction of the rotating body in a gap between the outer circumferential surface of the rotating body and the inner circumferential surface of the stationary body. The device further includes at least one opening member provided on the inner circumferential surface of the stationary body, the opening member being provided at a position between seal fins adjacent to each other in the axial direction, and having holes opened on a side of the inner circumferential surface of the stationary body.Type: ApplicationFiled: July 17, 2013Publication date: January 23, 2014Inventors: Tomohiko TSUKUDA, Yuki MIMURA, Akihiro ONODA, Naoki SHIBUKAWA, Iwataro SATO, Kazutaka TSURUTA
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Publication number: 20120067045Abstract: In one embodiment, a calculation method of moisture loss in a steam turbine calculates first a wetness fraction at the inlet and outlet of each of stationary blade cascades and rotor blade cascades. Subsequently, the moisture loss is classified into (1) supersaturation loss, (2) condensation loss, (3) acceleration loss, (4) braking loss, (5) capture loss and (6) pumping loss, and a loss for calculation of the moisture loss is selected from the above losses (1) to (6) according to the wetness fraction of steam at the inlet and outlet of each blade cascade. An amount of each selected loss is calculated, and an amount of moisture loss at each blade cascade is calculated.Type: ApplicationFiled: September 13, 2011Publication date: March 22, 2012Inventors: Hiroyuki KAWAGISHI, Akihiro Onoda, Tomohiro Tejima, Tomohiko Tsukuda, Asako Inomata, Naoki Shibukawa
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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