Patents by Inventor Seiji Nakashima

Seiji Nakashima 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).

  • Publication number: 20190137120
    Abstract: A bellmouth of a heat source unit includes: a straight tubular portion having a cylindrical shape; an air inlet portion which is radially expanded toward the upstream side, the air inlet portion has at least one angle-reduced portion that satisfies ?0>?i>0, where, an angle formed by a line L1 and a line L2 is taken as ?0, and an angle formed by a straight line L3 and the line L2 is taken as ?i, the line L1 is a line passing through a portion of an outer peripheral end portion of the air inlet portion, the line L2 is a line passing through a connecting portion between the air inlet portion and the straight tubular portion, and the straight line L3 is a line connecting an intersection P of the line L1 and the line L2 and a portion of the outer peripheral end portion of the air inlet portion.
    Type: Application
    Filed: July 19, 2016
    Publication date: May 9, 2019
    Inventors: Katsuyuki YAMAMOTO, Seiji NAKASHIMA, Yohei KATO, Tsubasa TANDA
  • Publication number: 20190120253
    Abstract: A propeller fan includes a boss on a rotation axis, and a blade at an outer circumferential portion of the boss. The blade includes a leading edge and a trailing edge. The blade includes a first area, a second area inward of the first area, and third areas outward of the second area. The third areas are located inward and outward of the first area, with the first area interposed between the third areas. The first area, the second area and the third areas each include at least one notch in the trailing edge. The notches satisfy the relationship “P1>P2>P3”, where P1 is the width of the notch in the first area, P2 is the width of the notch in the second area, and P3 is the width of the notch in each of the third areas.
    Type: Application
    Filed: July 1, 2016
    Publication date: April 25, 2019
    Inventors: Seiji NAKASHIMA, Takuya TERAMOTO, Katsuyuki YAMAMOTO, Yusuke ADACHI
  • Publication number: 20190040873
    Abstract: Provided is an air-sending device in which, in blades, an upstream end of a blade outer periphery is more on an upstream side than an upstream end of a blade inner periphery as seen along a rotation axis, and a downstream end of a blade outer periphery is more on a downstream side than a downstream end of the blade inner periphery, and in which, in the blades, when an angle formed by a line segment, which connects a point internally dividing a line segment connecting the downstream end and the upstream end of an outer periphery of the blades along the rotation axis and a point internally dividing a line segment connecting the downstream end and the upstream end of an inner periphery of the blades along the rotation axis at the same ratio to each other, and a reference line is defined as ?, and a direction inclined toward the downstream side is defined as positive, the angle ? is changed from negative to positive at a duct portion.
    Type: Application
    Filed: February 24, 2016
    Publication date: February 7, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takahide TADOKORO, Seiji NAKASHIMA, Yutaka AOYAMA, Shuhei MIZUTANI, Naomichi TAMURA
  • Publication number: 20190010960
    Abstract: A blower apparatus includes a propeller fan configured to rotate about a rotational axis, and a bell mouth annularly disposed to surround the propeller fan as seen in a direction of the rotational axis of the propeller fan. The bell mouth includes a flare portion located downstream of the propeller fan The flare portion has at least one first part and at least one second part. The first part has a first inner circumferential surface region. The second part as a second inner circumferential surface region. A first length of the first part inner circumferential surface region in the direction of the rotational axis is greater than a second length of the second part inner circumferential surface region in the direction of the rotational axis.
    Type: Application
    Filed: February 26, 2016
    Publication date: January 10, 2019
    Inventors: Seiji NAKASHIMA, Takahide TADOKORO, Shuhei MIZUTANI, Yutaka AOYAMA
  • Publication number: 20180238344
    Abstract: An axial flow fan according to the present invention includes a plurality of blades, each of the blades including: a leading edge formed in front in a direction of rotation of the axial flow fan; an inner circumferential edge formed at an inner circumference of the blades; and an outer circumferential edge formed at an outer circumference of the blades, the outer circumferential edge configured to be at downstream of a fluid, forced to move by the axial flow fan, than the inner circumferential edge, the blade being reflexed toward upstream of the fluid at a portion adjacent to the outer circumferential edge, and having a local angle-decrease section having a blade inlet angle ? at the leading edge decreasing from neighborhood, the local angle-decrease section being formed at a side of the leading edge and being located closer to the outer circumferential edge than to the inner circumferential edge.
    Type: Application
    Filed: November 2, 2015
    Publication date: August 23, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Seiji NAKASHIMA, Takahide TADOKORO, Shuhei MIZUTANI, Yutaka AOYAMA
  • Publication number: 20180238343
    Abstract: Provided is a propeller fan including a boss, and a blade fixed at an outer peripheral surface of the boss, wherein the blade has a second protrusion that protrudes toward a positive pressure surface side, at a trailing edge with respect to a rotation direction, the second protrusion is provided in a range on a radially outer side of a center of a radial distance from an inner peripheral end to an outer peripheral end of the blade, and has a protrusion tip end with a maximum protrusion height, a first base at a starting part of protrusion on a radially inner side of the protrusion tip end, and a second base at a starting part of protrusion on a radially outer side of the protrusion tip end, and the protrusion tip end is positioned nearer to the second base than to the first base in the radial direction.
    Type: Application
    Filed: September 8, 2015
    Publication date: August 23, 2018
    Inventors: Seiji NAKASHIMA, Katsuyuki YAMAMOTO
  • Patent number: 10052931
    Abstract: An outdoor cooling unit in a vehicle air-conditioning apparatus is configured such that the angle between a normal line to a suction plane of a suction portion and a normal line to a discharge plane of a discharge portion is acute and such that air inside a housing flows in a substantially checkmark-shape, substantially V shape or substantially U shape. In the outdoor cooling unit, a blade of an axial fan is configured such that a chord center line formed by connecting chord central points from an inner circumferential end to an outer circumferential end of the blade and projecting the connected chord central points on a plane containing a rotating shaft is convexly curved toward the downstream side over the entire area in the radial direction.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: August 21, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Seiji Nakashima, Shinichi Wakamoto, Taichi Uto
  • Publication number: 20180224135
    Abstract: A casing has a wall portion surrounding an impeller, as seen in an axial direction of a rotating shaft. The wall portion of the casing has a portion, and a portion located further away from a center of rotation of the rotating shaft than the portion, as seen in the axial direction. A curved portion has a curved surface portion located on a line connecting the center of rotation and the portion, and a curved surface portion located on a line connecting the center of rotation and the portion, as seen in the axial direction. A radius of curvature of the curved surface portion is greater than a radius of curvature of the curved surface portion.
    Type: Application
    Filed: November 2, 2015
    Publication date: August 9, 2018
    Inventors: Katsuyuki YAMAMOTO, Seiji NAKASHIMA, Takashi IKEDA
  • Publication number: 20180156475
    Abstract: An outdoor unit 1 of an air-conditioning apparatus includes a housing having a box shape and including air inlets formed on side surfaces and an air outlet formed on an upper surface, a fan provided to an upper side in the housing and configured to discharge, through the air outlet, outside air sucked through the air inlets, and a heat exchanger provided in the housing along each of the air inlets. The heat exchanger includes an upper heat exchanger disposed at an upper part of the housing and a lower heat exchanger disposed at a lower part of the housing. In plan view, the housing has different widths in short-side and long-side directions, and the width in the short-side direction at the upper part of the housing is longer than the width in the short-side direction at the lower part of the housing.
    Type: Application
    Filed: May 14, 2015
    Publication date: June 7, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takahide TADOKORO, Seiji NAKASHIMA, Shinya HIGASHIIUE, Naomichi TAMURA
  • Patent number: 9982898
    Abstract: An indoor unit includes a casing having a suction port formed in an upper part and a blow-out port formed on a lower side at a front face part, an axial-flow or diagonal-flow fan provided on the downstream side of the suction port in the casing, and a heat exchanger provided on the downstream side of the fan and on the upstream side of the blow-out port in the casing, in which air blown out of the fan and refrigerant are heat-exchanged.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: May 29, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shoji Yamada, Kenichi Sakoda, Masao Akiyoshi, Akira Takamori, Nobuaki Uehara, Tomoya Fukui, Seiji Nakashima, Naoki Iwamoto, Satoshi Michihata, Isao Otsuka, Masayuki Tsuji
  • Publication number: 20180106485
    Abstract: An outdoor unit for a refrigeration cycle apparatus includes an outdoor heat exchanger arranged around an axis on an upstream side of an airflow with respect to a propeller fan. Further, the outdoor heat exchanger includes a first flat surface portion, a second flat surface portion, and a curved portion connecting the first and second flat surface portions to each other. An airflow directing plate is opposed to an end portion of the outdoor heat exchanger on the propeller fan side from the axis side of the propeller fan. The airflow directing plate is opposed to at least any one of the first flat surface portion and the second flat surface portion without being opposed to the curved portion.
    Type: Application
    Filed: June 19, 2015
    Publication date: April 19, 2018
    Inventors: Atsushi KONO, Seiji NAKASHIMA
  • Patent number: 9784507
    Abstract: An outdoor cooling unit for vehicular air conditioning apparatus includes: a casing including an outlet section, inlet sections having an inlet plane inclined; a first heat exchanger facing one of the inlet sections and a second heat exchanger facing an other of the inlet sections; at least one propeller fan below the outlet section to blow out air upwardly. An angle formed between the normal line to the inlet plane and the z axis is an acute angle. Each of the blades includes a blade chord center point on an inner peripheral end thereof and an other blade chord center point on an outer peripheral end thereof, positioned so that a line segment connecting therebetween has an inclination to the outlet section proportionally to closeness to outer periphery of the blade. A blade chord center line forms a curve being convex toward the outlet section across the entire area.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: October 10, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Seiji Nakashima, Kenichi Sakoda
  • Publication number: 20170275997
    Abstract: A turbofan includes a boss rotatable about an axis, a main plate connected to the boss, a shroud having an intake hole, and a plurality of blades arranged between the main plate and the shroud. An undulating protrusion portion is arranged at a front edge portion of each blade. The undulating protrusion portion includes a plurality of protrusions. The pitches of the plurality of protrusions are formed so as to become smaller as approaching to the main plate side.
    Type: Application
    Filed: October 30, 2014
    Publication date: September 28, 2017
    Inventors: Seiji NAKASHIMA, Yoshiki SATO, Keisuke OISHI
  • Patent number: 9605686
    Abstract: A leading edge of a blade has a first curved portion provided with a leading-edge rearmost point, and a trailing edge of the blade has a second curved portion located on the inner circumferential side of the trailing edge and a third curved portion located on the outer circumferential side of the blade on the trailing edge. The third curved portion has a trailing-edge foremost point, and the second curved portion has a trailing-edge rearmost point. The trailing edge and a first concentric circle, which is one of concentric circles having as their center an axis of rotation and passes through the leading-edge rearmost point, intersect each other at a first intersection. The first intersection is located between the trailing-edge rearmost point and the trailing-edge foremost point.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: March 28, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shingo Hamada, Seiji Nakashima, Takashi Ikeda, Takahide Tadokoro, Takuya Kodama, Takashi Kobayashi, Hiroshi Yoshikawa, Hiroaki Makino
  • Patent number: 9394911
    Abstract: An axial flow fan, with which effective work of blades is ensured and blade tip vortices are suppressed, thereby reducing noise. The axial flow fan includes blades, which are each formed such that a chord centerline connecting chord center points from inner to outer peripheral ends of the blade is curved so as to protrude toward a downstream side in a whole region.
    Type: Grant
    Filed: May 13, 2010
    Date of Patent: July 19, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Seiji Nakashima, Koji Kise, Hirofumi Horiuchi
  • Publication number: 20150369546
    Abstract: An outdoor cooling unit for vehicular air conditioning apparatus includes: a casing including an outlet section, inlet sections having an inlet plane inclined; a first heat exchanger facing one of the inlet sections and a second heat exchanger facing an other of the inlet sections; at least one propeller fan below the outlet section to blow out air upwardly. An angle formed between the normal line to the inlet plane and the z axis is an acute angle. Each of the blades includes a blade chord center point on an inner peripheral end thereof and an other blade chord center point on an outer peripheral end thereof, positioned so that a line segment connecting therebetween has an inclination to the outlet section proportionally to closeness to outer periphery of the blade. A blade chord center line forms a curve being convex toward the outlet section across the entire area.
    Type: Application
    Filed: December 10, 2013
    Publication date: December 24, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Seiji NAKASHIMA, Kenichi SAKODA
  • Publication number: 20150044058
    Abstract: A leading edge of a blade has a first curved portion provided with a leading-edge rearmost point, and a trailing edge of the blade has a second curved portion located on the inner circumferential side of the trailing edge and a third curved portion located on the outer circumferential side of the blade on the trailing edge. The third curved portion has a trailing-edge foremost point, and the second curved portion has a trailing-edge rearmost point. The trailing edge and a first concentric circle, which is one of concentric circles having as their center an axis of rotation and passes through the leading-edge rearmost point, intersect each other at a first intersection. The first intersection is located between the trailing-edge rearmost point and the trailing-edge foremost point.
    Type: Application
    Filed: July 31, 2014
    Publication date: February 12, 2015
    Inventors: Shingo HAMADA, Seiji NAKASHIMA, Takashi IKEDA, Takahide TADOKORO, Takuya KODAMA, Takashi KOBAYASHI, Hiroshi YOSHIKAWA, Hiroaki MAKINO
  • Publication number: 20140246180
    Abstract: An outdoor cooling unit in a vehicle air-conditioning apparatus is configured such that the angle between a normal line to a suction plane of a suction portion and a normal line to a discharge plane of a discharge portion is acute and such that air inside a housing flows in a substantially checkmark-shape, substantially V shape or substantially U shape. In the outdoor cooling unit, a blade of an axial fan is configured such that a chord center line formed by connecting chord central points from an inner circumferential end to an outer circumferential end of the blade and projecting the connected chord central points on a plane containing a rotating shaft is convexly curved toward the downstream side over the entire area in the radial direction.
    Type: Application
    Filed: October 5, 2012
    Publication date: September 4, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Seiji Nakashima, Shinichi Wakamoto, Taichi Uto
  • Publication number: 20130101420
    Abstract: An axial flow fan, with which effective work of blades is ensured and blade tip vortices are suppressed, thereby reducing noise. The axial flow fan includes blades, which are each formed such that a chord centerline connecting chord center points from inner to outer peripheral ends of the blade is curved so as to protrude toward a downstream side in a whole region.
    Type: Application
    Filed: May 13, 2010
    Publication date: April 25, 2013
    Inventors: Seiji Nakashima, Koji Kise, Hirofumi Horiuchi
  • Publication number: 20120018117
    Abstract: An indoor unit includes a casing having a suction port formed in an upper part and a blow-out port formed on a lower side at a front face part, an axial-flow or diagonal-flow fan provided on the downstream side of the suction port in the casing, and a heat exchanger provided on the downstream side of the fan and on the upstream side of the blow-out port in the casing, in which air blown out of the fan and refrigerant are heat-exchanged.
    Type: Application
    Filed: October 2, 2009
    Publication date: January 26, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shoji Yamada, Kenichi Sakoda, Masao Akiyoshi, Akira Takamori, Nobuaki Uehara, Tomoya Fukui, Seiji Nakashima, Naoki Iwamoto, Satoshi Michihata, Isao Otsuka, Masayuki Tsuji