Patents by Inventor Kazutoshi Yoko
Kazutoshi Yoko 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: 11022126Abstract: A rotary machine includes: a casing; a rotor that includes a rotatable rotary shaft located inside the casing, and a plurality of stages of impellers fixed to an outer periphery of the rotary shaft; a diaphragm group including diaphragms that are respectively provided in the plurality of stages of the impellers; gas flow paths provided respectively corresponding to the impellers and through which process gas to be compressed flows; and a discharge volute connected to the gas flow paths. The discharge volute is provided to expand inward in an axis line direction of the casing.Type: GrantFiled: March 2, 2017Date of Patent: June 1, 2021Assignee: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATIONInventors: Shin Yanagisawa, Akihiro Nakaniwa, Eiichi Yanagisawa, Kazutoshi Yoko, Daisuke Hirata, Takanori Matsueda
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Patent number: 10975728Abstract: Flanges of half bodies provided in a compressor casing are fastened by multiple bolts and a multi-hole washer shared by two or more adjacent bolts. When F is fastening force, T is a thickness of the washer, ? is a distribution angle of the fastening force, Rb is a radius of the bolt, R is a radius of a distribution range of the fastening force on a bearing surface, A is an area of the distribution range on the surface, a is an area of a distribution range of the fastening force on a mating surface of the flange, and R=Rb+T·tan ? and A=?R2 are established, F/A is lower than yield strength of each of a flange material and a multi-hole washer material, and F/a is equal to or higher than predetermined surface pressure determined based on pressure of fluid inside the casing.Type: GrantFiled: August 21, 2019Date of Patent: April 13, 2021Assignee: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATIONInventors: Toshio Mizunoue, Kazutoshi Yoko, Eiichi Yanagisawa, Shin Yanagisawa
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Patent number: 10876546Abstract: A centrifugal compressor that includes a rotor including a shaft rotatably supported in a casing and an impeller secured to an outer periphery of the shaft; a diaphragm surrounding the impeller from an outer peripheral side; a suction side casing head disposed so as to be spaced apart from the diaphragm on a side where a fluid is suctioned; a temperature adjusting mechanism that is provided in the suction side casing head and configured to adjust a temperature of environment by flow of a heat medium; a heat shield that is provided between the suction side casing head and the diaphragm and defines, together with the impeller, a suction flow path through which the fluid is introduced to the impeller; and a plurality of straightening vanes that are provided in the suction flow path and configured to straighten the fluid flowing through the suction flow path.Type: GrantFiled: March 6, 2017Date of Patent: December 29, 2020Assignee: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATIONInventors: Noriyuki Okada, Eiichi Yanagisawa, Kazutoshi Yoko, Yuji Masuda, Shinichiro Tokuyama
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Patent number: 10801505Abstract: A centrifugal compressor according to the present invention includes, as gas flow paths, diffuser flow paths into which process gas flowing from impellers to outside in a radial direction flows, curved flow paths that respectively communicate with the diffuser flow paths and change a flowing direction of the process gas from a direction toward the outside in the radial direction to a direction toward inside in the radial direction, and return flow paths that respectively communicate with the curved flow paths and cause the process gas flowing through the curved flow paths to flow into the impellers. In the present invention, the curved flow path configuring at least one of the gas flow paths is provided between a diaphragm and a flow path forming body that is provided between the diaphragm and the casing.Type: GrantFiled: December 8, 2016Date of Patent: October 13, 2020Assignee: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATIONInventors: Kazutoshi Yoko, Shin Yanagisawa, Eiichi Yanagisawa, Akihiro Nakaniwa, Daisuke Hirata, Takanori Matsueda
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Publication number: 20200300253Abstract: A rotary machine includes: a casing; a rotor that includes a rotatable rotary shaft located inside the casing, and a plurality of stages of impellers fixed to an outer periphery of the rotary shaft; a diaphragm group including diaphragms that are respectively provided in the plurality of stages of the impellers; gas flow paths provided respectively corresponding to the impellers and through which process gas to be compressed flows; and a discharge volute connected to the gas flow paths. The discharge volute is provided to expand inward in an axis line direction of the casing.Type: ApplicationFiled: March 2, 2017Publication date: September 24, 2020Applicant: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATIONInventors: Shin Yanagisawa, Akihiro Nakaniwa, Eiichi Yanagisawa, Kazutoshi Yoko, Daisuke Hirata, Takanori Matsueda
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Publication number: 20190376417Abstract: Flanges of half bodies provided in a compressor casing are fastened by multiple bolts and a multi-hole washer shared by two or more adjacent bolts. When F is fastening force, T is a thickness of the washer, ? is a distribution angle of the fastening force, Rb is a radius of the bolt, R is a radius of a distribution range of the fastening force on a bearing surface, A is an area of the distribution range on the surface, a is an area of a distribution range of the fastening force on a mating surface of the flange, and R=Rb+T·tan ? and A=?R2 are established, F/A is lower than yield strength of each of a flange material and a multi-hole washer material, and F/a is equal to or higher than predetermined surface pressure determined based on pressure of fluid inside the casing.Type: ApplicationFiled: August 21, 2019Publication date: December 12, 2019Applicant: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATIONInventors: Toshio Mizunoue, Kazutoshi Yoko, Eiichi Yanagisawa, Shin Yanagisawa
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Publication number: 20190101133Abstract: A centrifugal compressor that includes a rotor including a shaft rotatably supported in a casing and an impeller secured to an outer periphery of the shaft; a diaphragm surrounding the impeller from an outer peripheral side; a suction side casing head disposed so as to be spaced apart from the diaphragm on a side where a fluid is suctioned; a temperature adjusting mechanism that is provided in the suction side casing head and configured to adjust a temperature of environment by flow of a heat medium; a heat shield that is provided between the suction side casing head and the diaphragm and defines, together with the impeller, a suction flow path through which the fluid is introduced to the impeller; and a plurality of straightening vanes that are provided in the suction flow path and configured to straighten the fluid flowing through the suction flow path.Type: ApplicationFiled: March 6, 2017Publication date: April 4, 2019Applicant: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATIONInventors: Noriyuki Okada, Eiichi Yanagisawa, Kazutoshi Yoko, Yuji Masuda, Shinichiro Tokuyama
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Publication number: 20190048877Abstract: A centrifugal compressor according to the present invention includes, as gas flow paths, diffuser flow paths into which process gas flowing from impellers to outside in a radial direction flows, curved flow paths that respectively communicate with the diffuser flow paths and change a flowing direction of the process gas from a direction toward the outside in the radial direction to a direction toward inside in the radial direction, and return flow paths that respectively communicate with the curved flow paths and cause the process gas flowing through the curved flow paths to flow into the impellers. In the present invention, the curved flow path configuring at least one of the gas flow paths is provided between a diaphragm and a flow path forming body that is provided between the diaphragm and the casing.Type: ApplicationFiled: December 8, 2016Publication date: February 14, 2019Applicant: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATIONInventors: Kazutoshi Yoko, Shin Yanagisawa, Eiichi Yanagisawa, Akihiro Nakaniwa, Daisuke Hirata, Takanori Matsueda
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Patent number: 9423183Abstract: A heat treatment method of an impeller includes a heat treatment preparation process of arranging the impeller within a vacuum furnace, an impeller covering process of covering an outer peripheral surface of the impeller in a circumferential direction by a heat uniformizing jig made of a radiation conversion material which radiates transferred heat as radiant heat, and a heat treatment process including a heating process and a cooling process in which heat treatment is performed by heating or cooling the impeller covered with the heat uniformizing jig from the periphery using a heater.Type: GrantFiled: February 15, 2013Date of Patent: August 23, 2016Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Kazutoshi Yoko, Hiroko Kitamoto, Shimpei Okayasu, Hiroki Takagi
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Publication number: 20150017593Abstract: A heat treatment method of an impeller includes a heat treatment preparation process of arranging the impeller within a vacuum furnace, an impeller covering process of covering an outer peripheral surface of the impeller in a circumferential direction by a heat uniformizing jig made of a radiation conversion material which radiates transferred heat as radiant heat, and a heat treatment process including a heating process and a cooling process in which heat treatment is performed by heating or cooling the impeller covered with the heat uniformizing jig from the periphery using a heater.Type: ApplicationFiled: February 15, 2013Publication date: January 15, 2015Inventors: Kazutoshi Yoko, Hiroko Kitamoto, Shimpei Okayasu, Hiroki Takagi
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Patent number: 8529236Abstract: In a vulcanizing system of the present invention, a temperature booster and a pressure booster are provided on a steam supply path connecting vulcanizers that belong to groups and a boiler allocated to the groups. The temperature booster and the pressure booster are sequentially arranged from an upstream side, a second branch supply path for supplying the steam to a mold between the temperature booster and the pressure booster is branched from the steam supply path. The second branch supply path is preferably in a form of allowing the steam temperature-boosted by the temperature booster to be supplied to the mold by bypassing the pressure booster.Type: GrantFiled: March 22, 2011Date of Patent: September 10, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Kazunari Tanaka, Naohiko Matsuda, Kazutoshi Yoko, Hideki Fukuda, Koji Shintani, Keiichi Tomoto
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Publication number: 20120301565Abstract: In a vulcanizing system of the present invention, a temperature booster and a pressure booster are provided on a steam supply path connecting vulcanizers that belong to groups and a boiler allocated to the groups. The temperature booster and the pressure booster are sequentially arranged from an upstream side, a second branch supply path for supplying the steam to a mold between the temperature booster and the pressure booster is branched from the steam supply path. The second branch supply path is preferably in a form of allowing the steam temperature-boosted by the temperature booster to be supplied to the mold by bypassing the pressure booster.Type: ApplicationFiled: March 22, 2011Publication date: November 29, 2012Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Kazunari Tanaka, Naohiko Matsuda, Kazutoshi Yoko, Hideki Fukuda, Koji Shintani, Keiichi Tomoto