Patents by Inventor Rimpei Kawashita

Rimpei Kawashita 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).

  • Patent number: 10907499
    Abstract: A rotor-blade-side sealing apparatus is configured to seal leakage of working fluid between rotor blade rings connected to distal end portions of rotor blade main bodies attached so as to extend in a radial direction from a rotor main body configured to rotate about an axis in a casing, and an inner circumferential surface of the casing. The rotor-blade-side sealing apparatus includes a sealing fin protruding in the radial direction from a side of the inner circumferential surface of the casing toward one of the rotor blade rings and extending in a circumferential direction. The sealing fin includes: a first sealing-fin main body portion and a second sealing-fin main body portion separated from each other in the circumferential direction across a gap portion that is a discontinuity along the circumferential direction; and an extending portion extending toward an upstream side in an axial direction of the rotor main body.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: February 2, 2021
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Makoto Iwasaki, Rimpei Kawashita, Yasunori Tokimasa
  • Publication number: 20200378397
    Abstract: An oil field pump installed within a pipe that connects to an oil field, and feeds accumulated extraction oil in a predetermined direction, the oil field pump including a rotor with an impeller, a stator installed on the outer circumferential of the rotor and that forms a flow path for passing the extraction oil between the stator and the rotor and that includes a diffuser on the downstream side of the impeller, a static pressure bearing device installed between the rotor and the stator and that supports the load in the radial direction, and a supply flow path that supplies, to the static pressure bearing device, a portion of the extraction oil flowing along the inner side in the radial direction of the path.
    Type: Application
    Filed: February 19, 2020
    Publication date: December 3, 2020
    Inventors: Rimpei KAWASHITA, Shimpei YOKOYAMA
  • Publication number: 20200200184
    Abstract: A centrifugal rotating machine includes a rotating shaft, an impeller, the impeller including a disk fixed to the rotating shaft and a cover covering a blade provided on the disk, and a casing which accommodates the impeller. An impeller flow path through which the fluid is pumped is formed by an upstream surface of the disk in the axial direction and an inner peripheral surface of the cover. In addition, an outer flow path is formed by an outer peripheral surface of the cover and an inner peripheral surface of the casing facing the outer peripheral surface of the cover. The outer flow path is connected to the impeller flow path at an outlet of the impeller flow path, and a protrusion portion protruding from the inner peripheral surface of the casing is provided in the outer flow path.
    Type: Application
    Filed: December 17, 2019
    Publication date: June 25, 2020
    Inventors: Makoto IWASAKI, Rimpei KAWASHITA, Yasunori TOKIMASA, Shuichi YAMASHITA, Jo MASUTANI
  • Publication number: 20200165927
    Abstract: An axial flow rotating machinery includes: a rotor; a casing; a rotating-blade stage including rotating blades and a radially-outer side rotating blade ring continuing to radially outer ends of the rotating blades; and a rotating-blade side seal device configured to seal a gap between the radially-outer side rotating blade ring and the casing. The rotating-blade side seal device includes: a seal fin having an annular shape and extending toward an outer peripheral surface of the radially-outer side rotating blade ring from the casing; and a swirl brake fixed to the casing in a cavity formed at an upstream side of the seal fin. The swirl brake includes: a first plate-shaped member having a surface along a radial direction of the rotor; and a second plate-shaped member or a third plate-shaped member having a surface oblique to the radial direction of the rotor.
    Type: Application
    Filed: January 29, 2019
    Publication date: May 28, 2020
    Inventors: Rimpei KAWASHITA, Makoto IWASAKI, Makoto KAMISHITA, Kazuyuki MATSUMOTO
  • Patent number: 10520386
    Abstract: This vibration measurement device is configured to measure the balancing vibration of the cartridge, a kind of rotating machines, who has a rotor and a cartridge body to support the rotor rotatably for variable operating speed, and is provided with a rigidly fixed support structure, acceleration sensors which detect the vibration of the cartridge, and a flat spring which elastically supports the cartridge with respect to the support structure and has a variable spring constant of elastic support.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: December 31, 2019
    Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.
    Inventors: Tomoaki Inoue, Katsuya Yamashita, Rimpei Kawashita, Hiroshi Nakagawa, Nariaki Seike, Noriyuki Hayashi, Hideo Mori
  • Publication number: 20190277158
    Abstract: A rotor-blade-side sealing apparatus that seals leakage of working fluid between rotor blade rings connected to distal end portions of rotor blade main bodies attached so as to extend in a radial direction from a rotor main body that rotates about an axis in a casing, and an inner circumferential surface of the casing, the rotor-blade-side sealing apparatus including a sealing fin protruding in the radial direction from a side of the inner circumferential surface of the casing toward the rotor blade rings and extending in a circumferential direction of the rotor main body. The sealing fin includes: a first sealing-fin main body portion and a second sealing-fin main body portion separated from each other in the circumferential direction across a gap portion that is a discontinuity along the circumferential direction; and a first extending portion extending toward an upstream side in an axial direction of the axis.
    Type: Application
    Filed: February 22, 2019
    Publication date: September 12, 2019
    Inventors: Makoto IWASAKI, Rimpei KAWASHITA, Yasunori TOKIMASA
  • Patent number: 10247016
    Abstract: A steam turbine includes a flow guide placed about a rotor shaft and forming a side wall of a diffuser. The flow guide is formed in such a substantially truncated conical shape that a first portion having a semi-circular-arc cross section and a second portion having a semi-circular-arc cross section and exhibiting less thermal deformation than the first portion are combined together. A coupling portion of the first portion with the second portion has a first protrusion protruding, in the circumferential direction thereof, more on a rotor shaft side than on a steam flow path side of the diffuser. A coupling portion of the second portion with the first portion has a second protrusion protruding, in the circumferential direction thereof, more on the steam flow path side of the diffuser than on the rotor shaft side and overlapping with the first protrusion in the radial direction of the flow guide.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: April 2, 2019
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Rimpei Kawashita, Tamiaki Nakazawa
  • Patent number: 9890810
    Abstract: A squeeze film damper includes a bearing housing as an inner ring disposed around a radially outer side of a bearing which rotatably supports a rotary shaft, an outer ring disposed around a radially outer side of the bearing housing, a squeeze film formed by circulating a viscous fluid through a clearance in a radial direction between the bearing housing and the outer ring, and a coupling pin which couples the bearing housing and the outer ring to each other and is deformable in response to relative displacement in the radial direction between the outer ring and the bearing housing. The coupling pin has stiffness that is higher in a vertical direction than in a horizontal direction in a cross section perpendicular to an axial direction of the rotary shaft.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: February 13, 2018
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Rimpei Kawashita, Kenichi Fujikawa, Hideaki Sugishita, Naoya Okamoto, Nobuhiro Nagata
  • Publication number: 20170138811
    Abstract: This vibration measurement device is configured to measure the balancing vibration of the cartridge, a kind of rotating machines, who has a rotor and a cartridge body to support the rotor rotatably for variable operating speed, and is provided with a rigidly fixed support structure, acceleration sensors which detect the vibration of the cartridge, and a flat spring which elastically supports the cartridge with respect to the support structure and has a variable spring constant of elastic support.
    Type: Application
    Filed: June 27, 2014
    Publication date: May 18, 2017
    Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.
    Inventors: Tomoaki INOUE, Katsuya YAMASHITA, Rimpei KAWASHITA, Hiroshi NAKAGAWA, Nariaki SEIKE, Noriyuki HAYASHI, Hideo MORI
  • Publication number: 20170002863
    Abstract: A squeeze film damper includes a bearing housing as an inner ring disposed around a radially outer side of a bearing which rotatably supports a rotary shaft, an outer ring disposed around a radially outer side of the bearing housing, a squeeze film formed by circulating a viscous fluid through a clearance in a radial direction between the bearing housing and the outer ring, and a coupling pin which couples the bearing housing and the outer ring to each other and is deformable in response to relative displacement in the radial direction between the outer ring and the bearing housing. The coupling pin has stiffness that is higher in a vertical direction than in a horizontal direction in a cross section perpendicular to an axial direction of the rotary shaft.
    Type: Application
    Filed: December 2, 2014
    Publication date: January 5, 2017
    Inventors: Rimpei KAWASHITA, Kenichi FUJIKAWA, Hideaki SUGISHITA, Naoya OKAMOTO, Nobuhiro NAGATA
  • Publication number: 20160356166
    Abstract: A steam turbine includes a flow guide placed about a rotor shaft and forming a side wall of a diffuser. The flow guide is formed in such a substantially truncated conical shape that a first portion having a semi-circular-arc cross section and a second portion having a semi-circular-arc cross section and exhibiting less thermal deformation than the first portion are combined together. A coupling portion of the first portion with the second portion has a first protrusion protruding, in the circumferential direction thereof, more on a rotor shaft side than on a steam flow path side of the diffuser. A coupling portion of the second portion with the first portion has a second protrusion protruding, in the circumferential direction thereof, more on the steam flow path side of the diffuser than on the rotor shaft side and overlapping with the first protrusion in the radial direction of the flow guide.
    Type: Application
    Filed: March 23, 2015
    Publication date: December 8, 2016
    Inventors: Rimpei KAWASHITA, Tamiaki NAKAZAWA
  • Publication number: 20140105701
    Abstract: An anti-vibration member is provided which includes a member main body having rubber elasticity or viscoelasticity and can be mounted on an outer surface of a tool main body by a frictional force against the outer surface.
    Type: Application
    Filed: July 13, 2012
    Publication date: April 17, 2014
    Inventors: Kazuya Matano, Rimpei Kawashita
  • Patent number: 8684670
    Abstract: A sealing mechanism includes a pair of space forming rings which face each other and are configured for surrounding a shaft body, an outer bellows-joint having one end connected to an outer periphery of one of the space forming rings and another end connected to an outer periphery of the other of the space forming rings, and an inner bellows-joint having one end connected to an inner periphery of one of the space forming rings and another end connected to an inner periphery of the other of the space forming rings. Each of the inner bellows-joint and the outer bellows-joint is a corrugated plate. The space forming rings space the inner bellows-joint and the outer bellows-joint apart from each other such that the inner bellows-joint and the outer bellows-joint do not come in contact with each other.
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: April 1, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Ryokichi Hombo, Tamiaki Nakazawa, Rimpei Kawashita
  • Patent number: 8550772
    Abstract: A first seal member includes a double-structure bellows in corrugated form, and vibration control device provided on the outside of the bellows such as to cover part of the bellows. A flat portion that is not in corrugated form is provided in part of the bellows. The vibration control device is provided in circumferential direction on an outer surface of the flat portion, and made up of a ring-shaped rib having a plurality of holes in a circumferential direction and weights inserted in the holes provided in a wall of rib. Natural frequency is adjusted by adjusting the number of weights, thereby preventing resonance between the natural frequency of the first seal member and the rotational frequency of rotor from occurring.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: October 8, 2013
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Rimpei Kawashita, Tamiaki Nakazawa, Tsuyoshi Miyabe, Ryokichi Hombo, Takashi Nakano
  • Patent number: 8545145
    Abstract: Spindle inclination detectors (41A, 41B) are equipped in columns (32A, 32B) of a portal bridge (24) of a machine tool (21). Each spindle inclination detector includes: a string (43) which hangs vertically with an upper end fixed to the column (reinforcement (32b)) and a lower end attached to a weight (45); a gap sensor (44) which is attached to the string to measure a distance to a front face plate (32a) of the column; and an oil damper (46). Moreover, a spindle inclination correction controller provided to the machine tool controls a Peltier device (42A, 42B) attached to a rear face plate (32d) of the column, on a basis of an average distance measured by the gap sensor, and thus corrects an inclination of a spindle (28) due to the thermal deformation of the column by correcting thermal deformation of the column.
    Type: Grant
    Filed: December 5, 2007
    Date of Patent: October 1, 2013
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Keiji Mizuta, Yoshiharu Ozawa, Mutsumi Yoshikawa, Rimpei Kawashita
  • Publication number: 20110236205
    Abstract: Providing a sealing mechanism provided with bellows-joints, the sealing mechanism being manufactured without surplus time and labor; thereby, the natural frequencies regarding the sealing mechanism surrounding a to-be-sealed shaft body are easily handled. Around a rotor shaft 26 of a steam turbine 10, between an outer turbine casing 12 and a gland 32, a sealing mechanism 40A is provided; the sealing mechanism is provided with an outer bellows-joint 46 and an inner bellows-joint 48, both the joints being arranged without mutual contact; the left and right ends of the outer bellows-joint 46 are gas-tightly connected to the outermost end periphery of the end flange 42 and the end flange 44, respectively; the left and right ends of the inner bellows-joint 48 are gas-tightly connected to the innermost end periphery of the end flange 42 and the end flange 44, respectively. Positioning both the bellows-joints can be easily performed.
    Type: Application
    Filed: December 2, 2010
    Publication date: September 29, 2011
    Inventors: Ryokichi HOMBO, Tamiaki NAKAZAWA, Rimpei KAWASHITA
  • Publication number: 20110014031
    Abstract: A first seal member 21A according to a first embodiment of the present invention includes a double-structure bellows 22 in corrugated form, and vibration control means provided on the outside of the bellows 22 such as to cover part of the bellows 22. A flat portion 23 that is not in corrugated form is provided in part of the bellows 22. The vibration control means is provided in a circumferential direction on an outer surface of the flat portion 23, and made up of a ring-shaped rib 25 having a plurality of holes in a circumferential direction and weights 26 inserted in the holes provided in an outer wall of the rib 25. Natural frequency is adjusted by adjusting the number of weights 26, thereby preventing resonance between the natural frequency of the first seal member 21A and the rotational frequency of a rotor from occurring.
    Type: Application
    Filed: March 10, 2009
    Publication date: January 20, 2011
    Inventors: Rimpei Kawashita, Tamiaki Nakazawa, Tsuyoshi Miyabe, Ryokichi Hombo, Takashi Nakano
  • Publication number: 20100024206
    Abstract: An object of the present invention is to provide: a spindle inclination detector capable of surely detecting spindle inclination with a simple configuration; and a machine tool including the spindle inclination detector. Spindle inclination detectors (41A, 41B) are equipped in columns (32A, 32B) of a portal bridge (24) of a machine tool (21). Each spindle inclination detector includes: a string (43) which hangs vertically with an upper end fixed to the column (reinforcement (32b)) and a lower end attached to a weight (45); a gap sensor (44) which is attached to the string to measure a distance to a front face plate (32a) of the column; and an oil damper (46).
    Type: Application
    Filed: December 5, 2007
    Publication date: February 4, 2010
    Applicant: Mitsubishi Heavy Industries, Ltd.
    Inventors: Keiji Mizuta, Yoshiharu Ozawa, Mutsumi Yoshikawa, Rimpei Kawashita
  • Publication number: 20090074523
    Abstract: A deep-hole drilling apparatus capable of preventing a tool mark from growing is provided. The deep-hole drilling apparatus provided for this purpose comprises: a tool (12) that is rotationally driven to drill a deep hole (Wa) in a work (W); an acceleration meter (19) that detects vibration of the tool (12) as the acceleration during deep hole processing; a monitoring apparatus (20) which performs frequency analysis on the acceleration detected by the acceleration meter (19) and which determines that a tool mark is produced in the deep hole (Wa) when the overall value of the whirling frequency and the bending natural frequency within a frequency range not including the torsional natural frequency on torsional vibration, constantly produced during the deep hole processing, exceeds a predetermined threshold (?); and an NC apparatus (18) that controls both revolution and feeding speed of the tool (12) on the basis of the determination made by the monitoring apparatus (20).
    Type: Application
    Filed: June 26, 2007
    Publication date: March 19, 2009
    Inventors: Rimpei Kawashita, Kazuo Hirota, Hitoshi Kaguchi, Yoshitake Kasubata, Akio Kambe