Patents by Inventor Shusaku Nabesaka

Shusaku Nabesaka 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).

  • Turbo-type fluid machine and a stepped seal apparatus to be used therein
    Patent number: 7338255
    Abstract: A turbo-type fluid machine comprises a mouth ring part provided between a shroud of an impeller and a pump casing and having a seal function. The mouth ring part comprises an impeller ring on a side of the shroud of the impeller and a casing ring provided on a side of a non-rotating body wall surface of the casing. The impeller ring is structured to have a stepped portion that is in the form of a staircase with at least two steps to be small in diameter toward a suction side of the impeller and large in diameter toward an outlet of the impeller. The casing ring is labyrinth-shaped to comprise a projection and a recess. A narrow clearance part having a narrow radial clearance is formed between the projection and the impeller ring. A flow passage spatial portion defining an enlarged portion of the narrow radial clearance is formed by the recess and the stepped portion of the impeller ring.
    Type: Grant
    Filed: July 6, 2005
    Date of Patent: March 4, 2008
    Assignee: Hitachi Industries Co., Ltd.
    Inventors: Shusaku Nabesaka, Sadashi Tanaka, Shinsuke Sakurai
  • Turbo-type fluid machine and a stepped seal apparatus to be used therein
    Publication number: 20060008348
    Abstract: A turbo-type fluid machine comprises a mouth ring part provided between a shroud of an impeller and a pump casing and having a seal function. The mouth ring part comprises an impeller ring on a side of the shroud of the impeller and a casing ring provided on a side of a non-rotating body wall surface of the casing. The impeller ring is structured to have a stepped portion that is in the form of a staircase with at least two steps to be small in diameter toward a suction side of the impeller and large in diameter toward an outlet of the impeller. The casing ring is labyrinth-shaped to comprise a projection and a recess. A narrow clearance part having a narrow radial clearance is formed between the projection and the impeller ring. A flow passage spatial portion defining an enlarged portion of the narrow radial clearance is formed by the recess and the stepped portion of the impeller ring.
    Type: Application
    Filed: July 6, 2005
    Publication date: January 12, 2006
    Applicant: Hitachi Industries Co., Ltd.
    Inventors: Shusaku Nabesaka, Sadashi Tanaka, Shinsuke Sakurai