Patents by Inventor Koji Maeta
Koji Maeta 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: 11927199Abstract: A compressor includes a rotation shaft which rotates around an axis, an impeller which press-feeds a fluid from one side in an axial direction toward an outward side in a radial direction by rotating together with the rotation shaft, a casing which surrounds the rotation shaft and the impeller and in which an exit flow channel for introducing a fluid press-fed from the impeller is formed, and an acoustic liner which is provided so as to face the inside of the exit flow channel in the casing. The acoustic liner has a plurality of open hole portions which are arranged with intervals therebetween, and acoustic spaces which communicate with the open hole portions and are independently provided for the respective open hole portions.Type: GrantFiled: March 24, 2022Date of Patent: March 12, 2024Assignee: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATIONInventors: Akihiro Nakaniwa, Koji Maeta, Takashi Oda
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Publication number: 20230135302Abstract: A compressor includes: a rotation shaft which is allowed to rotate around an axis; an impeller which is configured to pressure-feed a fluid from one side in an axial direction toward an outside in a radial direction by rotating together with the rotation shaft; a casing surrounding the rotation shaft and the impeller and in which an exit flow path guiding the fluid pressure-fed from the impeller is formed; and an acoustic liner which is installed to face an inside of the exit flow path in the casing. The acoustic liner includes: an acoustic space which is formed inside the acoustic liner; an introduction hole communicating the acoustic space with the exit flow path; and a vortex suppressor which is placed in a connection area between the introduction hole and the acoustic space and is configured to suppress vortexes which occur in the connection area.Type: ApplicationFiled: March 11, 2021Publication date: May 4, 2023Applicant: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATIONInventor: Koji Maeta
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Publication number: 20230003383Abstract: This combustor is provided with an outer cylinder, an inner cylinder, a direct injection nozzle, a tail pipe, and a base end side acoustic attenuator. The outer cylinder is disposed inside a gas turbine casing. The inner cylinder is disposed on the inner circumferential side of the outer cylinder. The direct injection nozzle is disposed on the inner circumferential side of the inner cylinder. The tail pipe is connected to the inner cylinder, and fuel injected from the direct injection nozzle is burned on the inner circumferential side of the tail pipe. The base end side acoustic attenuator has an outer cylinder formation portion that is a part of a plate forming the outer cylinder, and an acoustic cover forming a base end side space in the gas turbine casing on the outer circumferential side of the outer cylinder in cooperation with the outer cylinder formation portion.Type: ApplicationFiled: September 9, 2022Publication date: January 5, 2023Inventors: Yoshikazu MATSUMURA, Keisuke MATSUYAMA, Takanori ITO, Tomohito NAKAMORI, Koji MAETA, Takaya KODA, Atsushi KOYAMA
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Patent number: 11536499Abstract: Provided is a refrigeration machine provided with: a refrigeration cycle having a compressor, a condenser, an expander, an evaporator, and piping (12) which sequentially connects the compressor, the condenser, and the expander; and an acoustic device (13) having a space formation section (14) which has one end (14a) connected to the piping (12) and in which a space is formed, the acoustic device (13) also having a vibration body (20) which is affixed integrally to the other end of the space formation section (14) and which has a lower natural frequency than the space formation section (14).Type: GrantFiled: October 10, 2018Date of Patent: December 27, 2022Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Koji Maeta, Shintaro Omura
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Publication number: 20220349423Abstract: A compressor includes a rotation shaft which rotates around an axis, an impeller which press-feeds a fluid from one side in an axial direction toward an outward side in a radial direction by rotating together with the rotation shaft, a casing which surrounds the rotation shaft and the impeller and in which an exit flow channel for introducing a fluid press-fed from the impeller is formed, and an acoustic liner which is provided so as to face the inside of the exit flow channel in the casing. The acoustic liner has a plurality of open hole portions which are arranged with intervals therebetween, and acoustic spaces which communicate with the open hole portions and are independently provided for the respective open hole portions.Type: ApplicationFiled: March 24, 2022Publication date: November 3, 2022Applicant: MITSUBISHI HEAVY INDUSTRIES COMPRESSOR CORPORATIONInventors: Akihiro Nakaniwa, Koji Maeta, Takashi Oda
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Publication number: 20200355422Abstract: Provided is a refrigeration machine provided with: a refrigeration cycle having a compressor, a condenser, an expander, an evaporator, and piping (12) which sequentially connects the compressor, the condenser, and the expander; and an acoustic device (13) having a space formation section (14) which has one end (14a) connected to the piping (12) and in which a space is formed, the acoustic device (13) also having a vibration body (20) which is affixed integrally to the other end of the space formation section (14) and which has a lower natural frequency than the space formation section (14).Type: ApplicationFiled: October 10, 2018Publication date: November 12, 2020Applicant: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Koji MAETA, Shintaro OMURA
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Publication number: 20200348057Abstract: Provided is a refrigeration machine having: a refrigeration cycle having a compressor, a condenser, an expander, an evaporator, piping (12) which sequentially connects the compressor, the condenser, the expander, and the evaporator, and discharge piping; and an acoustic device (13) provided to the piping (12). The acoustic device (13) has a space formation section (14) having a space (S) formed therein and also having an open first end (14a) which is connected to the piping (12) so as to be in communication therewith; an extendible and contractible bellows pipe (21) connected to an open second end of the space formation section (14); and a sealing section (20) provided to the end of the bellows pipe (21), which is located on the opposite side thereof from the space formation section (14).Type: ApplicationFiled: October 9, 2018Publication date: November 5, 2020Applicant: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.Inventors: Koji MAETA, Shintaro OMURA
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Patent number: 8857189Abstract: In a gas-turbine combustion burner which is provided, at a distal end thereof, with a fuel spraying hole that sprays fuel into a combustion region formed inside a combustion cylinder of a gas-turbine combustor and in which a fuel flow path that guides the fuel, which is supplied from a fuel source, to the fuel spraying hole is formed in the interior thereof, the impedance of a fuel supply system that guides the fuel from the fuel source to the fuel spraying hole is set so that propagation of pressure fluctuations from the combustion region to the fuel supply system becomes an allowable level or less.Type: GrantFiled: June 13, 2012Date of Patent: October 14, 2014Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Keisuke Matsuyama, Takanori Ito, Tei Yamato, Koji Maeta, Sosuke Nakamura
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Publication number: 20130000306Abstract: In a gas-turbine combustion burner which is provided, at a distal end thereof, with a fuel spraying hole that sprays fuel into a combustion region formed inside a combustion cylinder of a gas-turbine combustor and in which a fuel flow path that guides the fuel, which is supplied from a fuel source, to the fuel spraying hole is formed in the interior thereof, the impedance of a fuel supply system that guides the fuel from the fuel source to the fuel spraying hole is set so that propagation of pressure fluctuations from the combustion region to the fuel supply system becomes an allowable level or less.Type: ApplicationFiled: June 13, 2012Publication date: January 3, 2013Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Keisuke Matsuyama, Takanori Ito, Tei Yamato, Koji Maeta, Sosuke Nakamura