Patents by Inventor Ryoichi Kawakami
Ryoichi Kawakami 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: 11494525Abstract: A method for analyzing a heat exchanger includes a structural model creation step (S1) of creating a structural model of a heat exchanger; a iron-linear model creation step (S4) of creating a iron-linear model in which a non-linear spring element in an out-of-plane direction, in which a load is generated only at me time of contact between a heat transfer tube and an anti-vibration member, is applied to an opposing portion between the heat transfer tube and the anti-vibration member in a structural model, and a load distribution acquisition step (S5) of performing analysis in which a load in the out-of-plane direction is applied to the non-linear model to acquire load distribution of the heat exchanger from a value of the load in each opposing portion.Type: GrantFiled: October 23, 2017Date of Patent: November 8, 2022Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Masatsugu Monde, Naoki Ono, Tomohito Nakamori, Masaaki Katayama, Ryoichi Kawakami, Masahito Matsubara, Tomonori Mineno
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Patent number: 11462335Abstract: A supporting force inspection device for inspecting a supporting force of a vibration suppression member interposed between bend portions of a plurality of heat transfer tubes of a steam generator includes: an acceleration sensor for detecting a vibration state of the bend portion; a sensor holding part disposed inside the heat transfer tube and configured to hold the acceleration sensor; and a vibration force generation part configured to generate a vibration force for vibrating the heat transfer tube along a plane in which a curvature circle of the bend portion exists. The vibration force generation part is configured to cooperate with the sensor holding part and vibrate the heat transfer tube along the plane in which the curvature circle exists.Type: GrantFiled: January 30, 2018Date of Patent: October 4, 2022Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Shingo Nishida, Kazuo Hirota, Ryoichi Kawakami
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Publication number: 20220025950Abstract: A sealing device includes a movable part which is fixed to a shaft penetrating a wall of a vessel and is movable with the shaft, the vessel being configured to include an interior space, a first bellows part which has a first end fixed to the vessel and a second end fixed to the movable part, for sealing a penetrated portion of the vessel by the shaft, a second bellows part which is disposed opposite to the first bellows part across the movable part, and has a first end disposed on a side of the first bellows part and fixed to the movable part, and a second end fixed to a stationary member, and a communication path for causing an interior space of the first bellows part and an interior space of the second bellows part to communicate with each other.Type: ApplicationFiled: January 11, 2019Publication date: January 27, 2022Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Shingo Nishida, Ryoichi Kawakami
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Publication number: 20210151209Abstract: A supporting force inspection device for inspecting a supporting force of a vibration suppression member interposed between bend portions of a plurality of heat transfer tubes of a steam generator includes: an acceleration sensor for detecting a vibration state of the bend portion; a sensor holding part disposed inside the heat transfer tube and configured to hold the acceleration sensor; and a vibration force generation part configured to generate a vibration force for vibrating the heat transfer tube along a plane in which a curvature circle of the bend portion exists. The vibration force generation part is configured to cooperate with the sensor holding part and vibrate the heat transfer tube along the plane in which the curvature circle exists.Type: ApplicationFiled: January 30, 2018Publication date: May 20, 2021Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Shingo Nishida, Kazuo Hirota, Ryoichi Kawakami
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Patent number: 10990712Abstract: There is provided a contact force evaluation method for evaluating a contact force against a supporting member of a tube bundle positioned in a fluid and supported by the supporting member, including a contact force setting step of setting a contact force of the tube bundle, a probability density function calculation step of calculating a probability density function of a reaction force received by the supporting member from the tube bundle in response to a predetermined input, using a vibration analysis model of the tube bundle and the supporting member, a probability calculation step of calculating a probability that a reaction force equal to or higher than the set contact force occurs, based on the calculated probability density function, and an evaluation step of evaluating the set contact force, based on the calculated probability.Type: GrantFiled: January 16, 2017Date of Patent: April 27, 2021Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Makoto Iwasaki, Kazuo Hirota, Shingo Nishida, Tetsuya Arikawa, Ryoichi Kawakami, Masaaki Katayama, Toshifumi Nariai, Kohei Yamamoto
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Publication number: 20190340307Abstract: A method for analyzing a heat exchanger includes a structural model creation step (S1) of creating a structural model of a heat exchanger; a iron-linear model creation step (S4) of creating a iron-linear model in which a non-linear spring element in an out-of-plane direction, in which a load is generated only at me time of contact between a heat transfer tube and an anti-vibration member, is applied to an opposing portion between the heat transfer tube and the anti-vibration member in a structural model, and a load distribution acquisition step (S5) of performing analysis in which a load in the out-of-plane direction is applied to the non-linear model to acquire load distribution of the heat exchanger from a value of the load in each opposing portion.Type: ApplicationFiled: October 23, 2017Publication date: November 7, 2019Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Masatsugu Monde, Naoki Ono, Tomohito Nakamori, Masaaki Katayama, Ryoichi Kawakami, Masahito Matsubara, Tomonori Mineno
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Publication number: 20190293482Abstract: A self-excited vibration evaluation method for evaluating self-excited vibration of a tube bundle arranged in a fluid so as to be supported by a support member includes: for each of at least one eigenmode of the tube bundle, a time history response analysis step of performing time history response analysis of simulating a change in vibration amplitude of the tube bundle, while changing a negative damping ratio corresponding to an excitation force of the fluid; calculating a critical flow velocity of the fluid on the basis of a minimum negative damping ratio at which the change of the vibration amplitude of the tube bundle diverges in the time history response analysis; inputting an expected flow velocity of the fluid; and evaluating the self-excited vibration of the tube bundle for each eigenmode by comparing the expected flow velocity of the fluid with the critical flow velocity.Type: ApplicationFiled: July 10, 2017Publication date: September 26, 2019Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Shingo Nishida, Makoto Iwasaki, Kazuo Hirota, Ryoichi Kawakami
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Publication number: 20190018921Abstract: There is provided a contact force evaluation method for evaluating a contact force against a supporting member of a tube bundle positioned in a fluid and supported by the supporting member, including a contact force setting step of setting a contact force of the tube bundle, a probability density function calculation step of calculating a probability density function of a reaction force received by the supporting member from the tube bundle in response to a predetermined input, using a vibration analysis model of the tube bundle and the supporting member, a probability calculation step of calculating a probability that a reaction force equal to or higher than the set contact force occurs, based on the calculated probability density function, and an evaluation step of evaluating the set contact force, based on the calculated probability.Type: ApplicationFiled: January 16, 2017Publication date: January 17, 2019Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Makoto Iwasaki, Kazuo Hirota, Shingo Nishida, Tetsuya Arikawa, Ryoichi Kawakami, Masaaki Katayama, Toshifumi Nariai, Kohei Yamamoto
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Patent number: 9182113Abstract: The steam generator includes: a water supply channel for supplying a secondary coolant to a tube bundle outer casing with the secondary coolant being isolated from the recirculating secondary coolant; a recirculating secondary coolant injection section for injecting the recirculating secondary coolant toward a high temperature-side heat transfer tube bundle; and a supplied secondary coolant injection section for injecting the secondary coolant supplied from the water supply channel toward a low temperature-side heat transfer tube bundle. The recirculating secondary coolant injection section and the supplied secondary coolant injection section being disposed in the tube bundle outer casing on the side toward the tube plate. The recirculating secondary coolant injection section and the supplied secondary coolant injection section are defined such that, of the secondary coolant and the recirculating secondary coolant, the coolant having a higher relative flow rate than the other flows at a lower velocity.Type: GrantFiled: April 2, 2012Date of Patent: November 10, 2015Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Ryoichi Kawakami, Kengo Shimamura, Tomoya Nakagawa, Tomoyuki Inoue
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Publication number: 20150219332Abstract: A heat exchanger tube vibration suppression device and a steam generator are provided. The heat exchanger tube vibration suppression device includes: a plurality of sleeves disposed in a heat exchanger tube with a predetermined gap in relation to an inner surface of the heat exchanger tube so as to extend in a longitudinal direction of the heat exchanger tube; and a connecting member that connects the plurality of sleeves so as to be movable between a contracted position at which adjacent sleeves overlap at least partially and an extended position at which the amount of overlap of the adjacent sleeves is minimized. In this way, it is possible to suppress the vibration of the heat exchanger tube appropriately.Type: ApplicationFiled: August 23, 2013Publication date: August 6, 2015Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Tomohito Nakamori, Yoshitsugu Nekomoto, Jun Hirai, Toshihiro Kojima, Akihisa Iwasaki, Hideyuki Morita, Kazuo Hirota, Kengo Shimamura, Takaya Kusakabe, Ryoichi Kawakami, Katsuyoshi Nishioka
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Patent number: 8881690Abstract: A steam generator having a heat transfer tube group formed of a plurality of U-shaped heat transfer tubes; an annular channel formed to cover the circumference of the heat transfer tube group; the annular channel having an opening that communicates with the heat transfer tube group; a water supply unit disposed at an upper portion of the annular channel and supplies water to a descending-side portion; a steam/water separator disposed above the heat transfer tube group; and an air bubble removing member for removing air bubbles provided in the annular channel.Type: GrantFiled: February 20, 2009Date of Patent: November 11, 2014Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Yoshiyuki Kondo, Koichi Tanimoto, Toshiyuki Mizutani, Kengo Shimamura, Ryoichi Kawakami
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Publication number: 20140053555Abstract: A heat transfer tube repairing apparatus including a wire that is flexible and is insertable into a heat transfer tube, a sleeve that is fixed to a predetermined position in the longitudinal direction of the wire, a pair of pressing members that is provided at the front and rear sides of the sleeve in the longitudinal direction of the wire and is able to press the inner surface of the heat transfer tube, and operation members that are able to move the pressing members between a pressing position where the pressing members press the inner surface of the heat transfer tube and a separating position where the pressing members are separated from the inner surface of the heat transfer tube.Type: ApplicationFiled: August 23, 2013Publication date: February 27, 2014Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Hideyuki Morita, Kazuo Hirota, Ryoichi Kawakami, Shingo Nishida, Kengo Shimamura, Takaya Kusakabe
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Publication number: 20140014295Abstract: A steam generator includes: an annular member (21) that surrounds a U-bent portion (18) obtained by collectively disposing bent portions of a plurality of heat transfer tubes and is provided between an outer peripheral portion of the U-bent portion (18) and a tube bundle shroud (3) surrounding the outer peripheral portion so as to have a predetermined gap with respect to the U-bent portion (18); a second support member (22) that is provided between the annular member (21) and the tube bundle shroud (3); and a third support member (23) that is attached to a cylinder portion (2) accommodating a plurality of heat transfer tubes and supports the second support member (22).Type: ApplicationFiled: June 21, 2012Publication date: January 16, 2014Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Ryuichi Umehara, Masatsugu Monde, Ryoichi Kawakami, Tomoya Nakagawa, Kazuo Hirota, Yoichi Iwamoto, Itaru Muroya
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Publication number: 20120247404Abstract: The steam generator includes: a water supply channel for supplying a secondary coolant to a tube bundle outer casing with the secondary coolant being isolated from the recirculating secondary coolant; a recirculating secondary coolant injection section for injecting the recirculating secondary coolant toward a high temperature-side heat transfer tube bundle; and a supplied secondary coolant injection section for injecting the secondary coolant supplied from the water supply channel toward a low temperature-side heat transfer tube bundle. The recirculating secondary coolant injection section and the supplied secondary coolant injection section being disposed in the tube bundle outer casing on the side toward the tube plate. The recirculating secondary coolant injection section and the supplied secondary coolant injection section are defined such that, of the secondary coolant and the recirculating secondary coolant, the coolant having a higher relative flow rate than the other flows at a lower velocity.Type: ApplicationFiled: April 2, 2012Publication date: October 4, 2012Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Ryoichi Kawakami, Kengo Shimamura, Tomoya Nakagawa, Tomoyuki Inoue
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Publication number: 20100212605Abstract: A steam generator is provided in which the total heat transfer efficiency can be improved by suppressing a reduction in the amount of heat exchange at an inlet side of heat transfer tubes while maintaining the effect of increasing the amount of heat exchange at an outlet side thereof.Type: ApplicationFiled: February 20, 2009Publication date: August 26, 2010Applicant: Mitsubishi Heavy Industries, Ltd.Inventors: Yoshiyuki Kondo, Koichi Tanimoto, Toshiyuki Mizutani, Kengo Shimamura, Ryoichi Kawakami
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Publication number: 20100018687Abstract: The present invention aims to decrease a pressure loss in a tube support plate 200 disposed in a steam generator, and ensure sufficient strength. The tube support plate 200 has many through-holes 100 formed therein for passage of heat transfer tubes 210. The shape of the through-hole 100 is a hexagonal shape. Protrusions 100a, 100b, 100c are formed in alternate sides 102, 104, 106 among the sides constituting the hexagonal shape. The arrangement of the through-holes 100 is a so-called honeycomb arrangement. Thus, the opening area of the through-hole 100 can be rendered large to decrease a pressure loss, and the strength of the tube support plate can be ensured.Type: ApplicationFiled: January 28, 2008Publication date: January 28, 2010Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Itaru Muroya, Kengo Shimamura, Ryoichi Kawakami
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Publication number: 20010056089Abstract: A novel crystal of 7&bgr;-[2-(2-aminothiazol-4-yl)-2-(Z)-(hydroxyimino)acetamido]-3-[pyrazol-4-yl)methylthio]3-cephem-4-carboxylic acid or a salt thereof.Type: ApplicationFiled: July 18, 2001Publication date: December 27, 2001Applicant: FUJISAWA PHARMACEUTICAL CO., LTD.Inventors: Kohji Kawabata, Takeshi Terasawa, Ayako Ohki, Fumiyuki Shirai, Hirofumi Yamamoto, Ryoichi Kawakami, Chiaki Hamaguchi
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Publication number: 20010007903Abstract: A novel crystal of 7&bgr;-[2-(2-aminothiazol-4-yl)-2-(Z)-(hydroxyimino)acetamido]-3-[pyrazol-4-yl)methylthio]3-cephem-4-carboxylic acid or a salt thereof.Type: ApplicationFiled: May 16, 1997Publication date: July 12, 2001Inventors: KOHJI KAWABATA, TAKESHI TERASAWA, AYAKO OHKI, FUMIYUKI SHIRAI, HIROFUMI YAMAMOTO, RYOICHI KAWAKAMI, CHIAKI HAMAGUCHI
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Patent number: 5525722Abstract: A process for producing bicozamycin benzoate is provided which comprises reacting bicozamycin with benzoic anhydride in the presence of 4-dimethylaminopyridine. The process provided for producing bicozamycin benzoate gives improved yields as compared with the prior art process.Type: GrantFiled: July 28, 1995Date of Patent: June 11, 1996Assignee: Fujisawa Pharmaceutical Co., Ltd.Inventors: Hitoshi Nakamura, Ryoichi Kawakami, Kunihiko Shiina