Patents by Inventor Takashi OKIHARA

Takashi OKIHARA 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).

  • Pump suction pipe
    Patent number: 9334885
    Abstract: The present invention is to suppress generation of cavitation in an impeller of a pump and disproportion of generation areas thereof by suppressing a secondary flow generated in a bent portion of a pump suction pipe. A pump suction pipe includes: a suction pipe outlet portion that is connected to an impeller suction port of a pump and is arranged in the up-and-down direction; a suction pipe inlet portion that is arranged in the lateral direction; and a suction pipe bent portion that connects the suction pipe outlet portion and the suction pipe inlet portion to each other and changes a flow from the lateral direction to the up-and-down direction. The distance from a reference point to an inner end of the suction pipe bent portion is monotonically increased from the upstream side to the downstream side on a vertical cross-section.
    Type: Grant
    Filed: April 11, 2013
    Date of Patent: May 10, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Okihara, Takahide Nagahara, Daichi Torii, Takeshi Kazama
  • PUMP SUCTION PIPE
    Publication number: 20130269817
    Abstract: The present invention is to suppress generation of cavitation in an impeller of a pump and disproportion of generation areas thereof by suppressing a secondary flow generated in a bent portion of a pump suction pipe. A pump suction pipe includes: a suction pipe outlet portion that is connected to an impeller suction port of a pump and is arranged in the up-and-down direction; a suction pipe inlet portion that is arranged in the lateral direction; and a suction pipe bent portion that connects the suction pipe outlet portion and the suction pipe inlet portion to each other and changes a flow from the lateral direction to the up-and-down direction. The distance from a reference point to an inner end of the suction pipe bent portion is monotonically increased from the upstream side to the downstream side on a vertical cross-section.
    Type: Application
    Filed: April 11, 2013
    Publication date: October 17, 2013
    Applicant: Hitachi, Ltd.
    Inventors: Takashi OKIHARA, Takahide NAGAHARA, Daichi TORII, Takeshi KAZAMA