Patents by Inventor Ezo Kita

Ezo Kita 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).

  • Method of counterflow through a pump and method of controlling the operation of a pump in a pumping installation
    Patent number: 5456115
    Abstract: A method of detecting a counterflow in a pump comprises providing with detecting means for detecting variations in the discharge pressure of the pump and signal analyzing means for analyzing oscillation components contained in an output signal from the pressure detecting means, and detecting the pump's operating point to have entered a counterflow characteristic operation region when a waveform of the detection signal generated in association with the variations in the discharge pressure of the pump exhibits a predetermined spectrum distribution. Further, when it is detected that the operating point enters a counterflow characteristic operation region, the escape from that region is performed by temporally throttling the guide vane and temporally increasing the rotating speed.
    Type: Grant
    Filed: August 4, 1993
    Date of Patent: October 10, 1995
    Assignees: Hitachi, Ltd., The Kansai Electric Power Co., Inc.
    Inventors: Takao Kuwabara, Ezo Kita, Isao Yokoyama, Hiroto Nakagawa, Yasuteru Oono
  • Method of controlling the operation of a pump in a pumping installation by detecting counterflow
    Patent number: 5090872
    Abstract: A method of detecting a counterflow in a pump comprises providing with detecting means for detecting variations in the discharge pressure of the pump and signal analyzing means for analyzing oscillation components contained in an output signal from the pressure detecting means, and detecting the pump's operating point to have entered a counterflow characteristic operation region when a waveform of the detection signal generated in association with the variations in the discharge pressure of the pump exhibits a predetermined spectrum distribution. Further, when it is detected that the operating point enters a counterflow characteristic operation region, the escape from that region is performed by temporally throttling the guide vane and temporally increasing the rotating speed.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: February 25, 1992
    Assignees: Hitachi Ltd., The Kansai Electric Power Co., Inc.
    Inventors: Takao Kuwabara, Ezo Kita, Isao Yokoyama, Hiroto Nakagawa, Yasuteru Oono