Patents by Inventor Yoshitaka Kume

Yoshitaka Kume 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).

  • Ejector cycle system with critical refrigerant pressure
    Patent number: 6477857
    Abstract: In an ejector cycle system using carbon dioxide as refrigerant, an ejector decompresses and expands refrigerant from a radiator to suck gas refrigerant evaporated in an evaporator, and converts an expansion energy to a pressure energy to increase a refrigerant pressure to be sucked into a compressor. Because refrigerant is decompressed and expanded in a super-critical area, a pressure difference during the decompression operation becomes larger, and a specific enthalpy difference becomes larger. Accordingly, energy converting efficiency in the ejector becomes higher, and efficiency of the ejector cycle system is improved.
    Type: Grant
    Filed: March 13, 2001
    Date of Patent: November 12, 2002
    Assignee: Denso Corporation
    Inventors: Hirotsugu Takeuchi, Kazuhisa Makida, Yoshitaka Kume, Hiroshi Ishikawa, Kunio Iritani, Satoshi Nomura, Hisayoshi Sakakibara, Makoto Ikegami
  • Ejector cycle system
    Patent number: 6438993
    Abstract: In an ejector cycle system, a mixing portion of an ejector has a length in a refrigerant flow direction and an equivalent diameter, and a ratio of the length to the equivalent diameter of the mixing portion is equal to or smaller than 120. Further, a ratio of the equivalent diameter of the mixing portion to an equivalent diameter at an outlet of a nozzle of the ejector is in a range of 1.05-10. Accordingly, the ejector cycle system operates while a high ejector efficiency is maintained.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: August 27, 2002
    Assignee: Denso Corporation
    Inventors: Hirotsugu Takeuchi, Yoshitaka Kume, Hiroshi Oshitani, Gota Ogata
  • Ejector cycle system
    Publication number: 20020000095
    Abstract: In an ejector cycle system, a mixing portion of an ejector has a length in a refrigerant flow direction and an equivalent diameter, and a ratio of the length to the equivalent diameter of the mixing portion is equal to or smaller than 120. Further, a ratio of the equivalent diameter of the mixing portion to an equivalent diameter at an outlet of a nozzle of the ejector is in a range of 1.05-10. Accordingly, the ejector cycle system operates while a high ejector efficiency is maintained.
    Type: Application
    Filed: June 1, 2001
    Publication date: January 3, 2002
    Inventors: Hirotsugu Takeuchi, Yoshitaka Kume, Hiroshi Oshitani, Gota Ogata
  • Ejector cycle system with critical refrigerant pressure
    Publication number: 20010025499
    Abstract: In an ejector cycle system using carbon dioxide as refrigerant, an ejector decompresses and expands refrigerant from a radiator to suck gas refrigerant evaporated in an evaporator, and converts an expansion energy to a pressure energy to increase a refrigerant pressure to be sucked into a compressor. Because refrigerant is decompressed and expanded in a super-critical area, a pressure difference during the decompression operation becomes larger, and a specific enthalpy difference becomes larger. Accordingly, energy converting efficiency in the ejector becomes higher, and efficiency of the ejector cycle system is improved.
    Type: Application
    Filed: March 13, 2001
    Publication date: October 4, 2001
    Inventors: Hirotsugu Takeuchi, Kazuhisa Makida, Yoshitaka Kume, Hiroshi Ishikawa, Kunio Iritani, Satoshi Nomura, Hisayoshi Sakakibara, Makoto Ikegami