Patents by Inventor Yutaka Fujita
Yutaka Fujita 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: 11326622Abstract: A centrifugal compressor includes: a housing; an impeller rotatably disposed within the housing; a rotational shaft connected to the impeller; and a bearing member supporting the rotational shaft in the housing. An oil flow passage through which oil flows is formed in the housing. The oil flow passage includes a lubricating oil passage through which the oil flows as lubricating oil to be supplied to the bearing member, and a cooling oil passage through which the oil flows as cooling oil for heat exchange with a fluid compressed by the impeller. The cooling oil passage is configured so that the oil flows into the cooling oil passage as the cooling oil without passing through the bearing member.Type: GrantFiled: November 15, 2018Date of Patent: May 10, 2022Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yutaka Fujita, Yosuke Dammoto, Nobuhito Oka
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Publication number: 20220136464Abstract: A surge suppression device for suppressing surge in an exhaust turbine-type turbocharger includes: a high-pressure tank configured to accumulate high-pressure gas with a higher pressure than atmospheric pressure; a high-pressure gas injection line connecting the high-pressure tank and an upstream intake passage on an upstream side of a compressor of the turbocharger; an on-off valve configured to open and close the high-pressure gas injection line; and a control device configured to control the on-off valve on the basis of a relationship between a pressure ratio of the compressor of the turbocharger and an intake flow rate.Type: ApplicationFiled: March 14, 2019Publication date: May 5, 2022Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yutaka FUJITA, Nobuhito OKA, Makoto OZAKI
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Publication number: 20210372430Abstract: A centrifugal compressor includes an impeller; a compressor cover including at least an inlet pipe portion having an intake air flow path formed for sending gas to the impeller; a movable member disposed inside the compressor cover so as to be movable along a direction of an axis of the impeller; and a movement mechanism configured to move the movable member along the direction of the axis of the impeller, the movement mechanism moving the movable member in the direction of the axis to bring the movable member and an inner wall surface of the compressor cover into contact with each other. At least one of the compressor cover and the movable member has a contact portion configured of an abradable sealing material or a high-elasticity plastic material at which the compressor cover and the movable member come into contact with each other.Type: ApplicationFiled: April 30, 2021Publication date: December 2, 2021Inventors: Yutaka FUJITA, Kenichiro IWAKIRI
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Publication number: 20210332719Abstract: A turbocharger includes a turbine housing configured to house a turbine rotor provided on one side of a rotor shaft; and a bearing housing configured to house a bearing that rotatably supports the rotor shaft, in which at least one cooling water flow path through which cooling water flows is formed in at least one of the turbine housing and the bearing housing, and the at least one cooling water flow path is formed such that a plurality of flow path cross sections are present in, of a cross-section including an axis of the rotor shaft, a half cross-section divided by the axis.Type: ApplicationFiled: April 8, 2021Publication date: October 28, 2021Inventors: Yutaka FUJITA, Tadashi KANZAKA
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Patent number: 11136994Abstract: In a centrifugal compressor including an impeller rotatably disposed in a housing, the housing includes a shroud wall and a hub wall, which define a diffuser passage communicating with an outlet of the impeller. The diffuser flow passage includes a pinched part configured such that the shroud wall is closer to the hub wall radially outward of the centrifugal compressor from the outlet of the impeller, and a parallel part communicating with the pinched part on a radially outer side of the centrifugal compressor than the pinched part, the parallel part being configured such that the shroud wall and the hub wall are parallel to each other. The shroud wall has a surface facing the impeller and the hub wall, the surface having a cross-sectional shape where a tangent line exists at any position in a cross-section including an axis of the impeller.Type: GrantFiled: April 4, 2018Date of Patent: October 5, 2021Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yutaka Fujita, Hironori Honda, Nobuhito Oka
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Publication number: 20210215171Abstract: A centrifugal compressor includes: a housing; an impeller rotatably disposed within the housing; a rotational shaft connected to the impeller; and a bearing member supporting the rotational shaft in the housing. An oil flow passage through which oil flows is formed in the housing. The oil flow passage includes a lubricating oil passage through which the oil flows as lubricating oil to be supplied to the bearing member, and a cooling oil passage through which the oil flows as cooling oil for heat exchange with a fluid compressed by the impeller. The cooling oil passage is configured so that the oil flows into the cooling oil passage as the cooling oil without passing through the bearing member.Type: ApplicationFiled: November 15, 2018Publication date: July 15, 2021Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yutaka FUJITA, Yosuke DAMMOTO, Nobuhito OKA
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Publication number: 20210164487Abstract: A rotor includes: a hub; and a plurality of blades disposed on the hub. Each of the plurality of blades includes a suction surface, a pressure surface, a leading edge, a trailing edge, a tip-side edge, and a hub-side edge. In a cross-section of each blade at a given chord position between the leading edge and the trailing edge, an angle of at least one of the suction surface or the pressure surface with respect to a blade height direction of the blade increases in a direction from the hub-side edge to the tip-side edge over a region from the hub-side edge to the tip-side edge, in at least a range from the leading edge to a chord position away from the leading edge toward the trailing edge.Type: ApplicationFiled: June 11, 2018Publication date: June 3, 2021Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yoshihiro HAYASHI, Yutaka FUJITA, Nobuhito OKA, Koichi TAKAHASHI, Hayato NISHI
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Patent number: 11022130Abstract: This turbocharger (1A) is provided with: a rotating shaft (4); a turbine wheel (2); a compressor wheel (3); a bearing housing (6) provided with journal bearings (5A, 5B) for rotatably supporting a shaft (4), and a thrust bearing (8) for supporting the rotating shaft (4) in the center axis (C) direction thereof; and a turbine housing (31) in which the turbine wheel (2) is accommodated. A fluid supply section (70A) for supplying a fluid to the turbine wheel (2) is provided within the turbine housing (31) and said fluid presses the turbine wheel (2) toward a first end (4a) side.Type: GrantFiled: March 30, 2016Date of Patent: June 1, 2021Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yutaka Fujita, Takao Yokoyama, Seiichi Ibaraki
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Patent number: 11002291Abstract: A compressor impeller includes: a compressor impeller body portion including a boss portion and a plurality of vane portions disposed at intervals in a circumferential direction on a peripheral surface of the boss portion; and a heat shield portion disposed on a side of a back surface of the boss portion and configured to rotate with the compressor impeller body portion.Type: GrantFiled: March 30, 2016Date of Patent: May 11, 2021Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Takao Yokoyama, Yutaka Fujita
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Publication number: 20210123381Abstract: A turbine shaft used for a turbocharger including a turbine and a compressor includes a turbine impeller, and a rotor shaft joined on one end side to the turbine impeller. The rotor shaft includes a fitting region configured to fit with a compressor impeller of the compressor by inserting the other end side of the rotor shaft into a through hole formed in the compressor impeller, a fastening region formed between the fitting region and the other end side of the rotor shaft, and configured to allow fastening by a fastening part, and a tapered part having a maximum outer diameter at a position closest to the turbine impeller in the fitting region and formed such that an outer diameter of the rotor shaft decreases from the position closest to the turbine impeller toward a tip side of the compressor impeller.Type: ApplicationFiled: August 7, 2018Publication date: April 29, 2021Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yutaka FUJITA, Yosuke DANMOTO
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Publication number: 20210108647Abstract: A centrifugal compressor includes: an impeller; a compressor inlet tube configured to guide air to the impeller; a scroll flow passage disposed on a radially outer side of the impeller; a bypass flow passage branching from the scroll flow passage via a branch port, the bypass flow passage connecting to the compressor inlet tube not via the impeller; and a bypass valve capable of opening and closing a valve port disposed in the bypass flow passage. The branch port has a non-circular shape when viewed along a normal N1 of the branch port passing through a center of the branch port.Type: ApplicationFiled: July 6, 2018Publication date: April 15, 2021Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Kenichiro IWAKIRI, Yutaka FUJITA, Yoshihiro HAYASHI
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Publication number: 20210033103Abstract: A centrifugal compressor includes an impeller, a compressor inlet pipe for guiding air to the impeller, a scroll passage disposed on an outer peripheral side of the impeller, and a bypass passage connecting the compressor inlet pipe and the scroll passage and bypassing the impeller. In a cross-section perpendicular to an axis of the compressor inlet pipe, when A1 is a connection portion on a downstream side in a rotational direction of the impeller of connection portions between an inner wall surface of the compressor inlet pipe and an inner wall surface of the bypass passage, C is a virtual circle constituting the inner wall surface of the compressor inlet pipe, and L1 is a tangent line of the virtual circle C at the connection portion A1, the inner wall surface of the bypass passage is formed from the connection portion A1 along the tangent line L1.Type: ApplicationFiled: July 13, 2018Publication date: February 4, 2021Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yoshihiro HAYASHI, Yutaka FUJITA, Kenichiro IWAKIRI
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Publication number: 20210033107Abstract: In a centrifugal compressor including an impeller rotatably disposed in a housing, the housing includes a shroud wall and a hub wall, which define a diffuser passage communicating with an outlet of the impeller. The diffuser flow passage includes a pinched part configured such that the shroud wall is closer to the hub wall radially outward of the centrifugal compressor from the outlet of the impeller, and a parallel part communicating with the pinched part on a radially outer side of the centrifugal compressor than the pinched part, the parallel part being configured such that the shroud wall and the hub wall are parallel to each other. The shroud wall has a surface facing the impeller and the hub wall, the surface having a cross-sectional shape where a tangent line exists at any position in a cross-section including an axis of the impeller.Type: ApplicationFiled: April 4, 2018Publication date: February 4, 2021Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yutaka FUJITA, Hironori HONDA, Nobuhito OKA
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Publication number: 20210017875Abstract: A turbomachinery according to an embodiment includes an impeller including at least one blade, and a casing for housing the impeller rotatably. A size of a gap between a tip of the blade and an inner surface of the casing during a stop of the impeller is formed non-uniformly over a circumferential direction of the impeller.Type: ApplicationFiled: December 21, 2018Publication date: January 21, 2021Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Isao TOMITA, Reiko TAKASHIMA, Yutaka FUJITA
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Patent number: 10883513Abstract: This compressor wheel (3) is provided with a disc (22) which is formed in a disc shape and provided to be rotatable around a central axis (C); and a plurality of blades (23) provided on a disc surface (22f) facing a first side in the central axis (C) direction with an interval in a circumferential direction around the central axis (C). A rear surface (22r) of the disc (22) facing a second side in the central axis (C) direction has a convex curved surface (25) which is convex toward the second side in the central axis (C) direction at least part of a center portion of the disc (22).Type: GrantFiled: March 30, 2016Date of Patent: January 5, 2021Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yutaka Fujita, Tadashi Kanzaka, Hiroaki Yoshizawa
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Publication number: 20200378389Abstract: An electric supercharger includes: a compressor impeller; a motor configured to transmit a driving force to the compressor impeller via a rotational shaft; a back-surface side casing facing a back surface of the compressor impeller via a gap and surrounding the rotational shaft; a bearing disposed between the back-surface side casing and the rotational shaft so as to support the rotational shaft rotatably; and a mechanical seal positioned between the back surface of the compressor impeller and the bearing in an axial direction of the compressor impeller and configured to seal a gap between the rotational shaft and the back-surface side casing.Type: ApplicationFiled: March 29, 2017Publication date: December 3, 2020Applicants: MITSUBISHI HEAVY INDUSTRIES, LTD., MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Naomichi SHIBATA, Byeongil AN, Akihiro SUGIYAMA, Yutaka FUJITA, Tadashi KANZAKA
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Publication number: 20200355198Abstract: An impeller for a centrifugal compressor includes a plurality of blades arranged around a hub, and on a trailing edge of the blade, a blade angle at a first position on a shroud side from a center position in a span direction of the blade is larger than a blade angle at a second position on a hub side from the center position.Type: ApplicationFiled: February 7, 2020Publication date: November 12, 2020Inventors: Hironori HONDA, Kenichiro IWAKIRI, Isao TOMITA, Yutaka FUJITA
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Publication number: 20200166052Abstract: A compressor impeller includes: a compressor impeller body portion including a boss portion and a plurality of vane portions disposed at intervals in a circumferential direction on a peripheral surface of the boss portion; and a heat shield portion disposed on a side of a back surface of the boss portion and configured to rotate with the compressor impeller body portionType: ApplicationFiled: March 30, 2016Publication date: May 28, 2020Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Takao YOKOYAMA, Yutaka FUJITA
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Publication number: 20190154043Abstract: This turbocharger (1A) is provided with: a rotating shaft (4); a turbine wheel (2); a compressor wheel (3); a bearing housing (6) provided with journal bearings (5A, 5B) for rotatably supporting a shaft (4), and a thrust bearing (8) for supporting the rotating shaft (4) in the center axis (C) direction thereof; and a turbine housing (31) in which the turbine wheel (2) is accommodated. A fluid supply section (70A) for supplying a fluid to the turbine wheel (2) is provided within the turbine housing (31) and said fluid presses the turbine wheel (2) toward a first end (4a) side.Type: ApplicationFiled: March 30, 2016Publication date: May 23, 2019Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yutaka FUJITA, Takao YOKOYAMA, Seiichi IBARAKI
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Publication number: 20190113048Abstract: This compressor wheel (3) is provided with a disc (22) which is formed in a disc shape and provided to be rotatable around a central axis (C); and a plurality of blades (23) provided on a disc surface (22f) facing a first side in the central axis (C) direction with an interval in a circumferential direction around the central axis (C). A rear surface (22r) of the disc (22) facing a second side in the central axis (C) direction has a convex curved surface (25) which is convex toward the second side in the central axis (C) direction at least part of a center portion of the disc (22).Type: ApplicationFiled: March 30, 2016Publication date: April 18, 2019Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.Inventors: Yutaka FUJITA, Tadashi KANZAKA, Hiroaki YOSHIZAWA