Patents by Inventor Kenji Emi

Kenji Emi 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).

  • Variable displacement wobble plate compressor with capacity control valve
    Patent number: 4815943
    Abstract: A variable displacement compressor comprises a housing forming a crank chamber, a shaft, expansible chambers including pistons, a swash plate connected to the shaft so as to be smoothly changeable in inclination against the shaft and driven to rotate, a wobble plate rotatable on the swash plate, a rotation preventing mechanism including a shoe member slidable in an axial direction, and a pressure control valve which is provided in a refrigerant passage from a suction port of the compressor to the expansible chamber to control the pressure of refrigerant to be sucked responsive to the suction pressure and both to the suction pressure and to the discharge pressure when the discharge pressure is high. The refrigerant passage has a sharply bent portion for separating lubrication oil from a refrigerant flowing therein and communicates with the crank chamber to discharge blow-by gas therefrom.
    Type: Grant
    Filed: September 30, 1987
    Date of Patent: March 28, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Kawashima, Kenji Emi, Akira Tezuka, Kosaku Sayo, Toshikazu Ito, Toshio Sudo, Yukio Takahashi, Isao Hayase, Atsushi Suginuma, Kiyosi Yamamoto, Hideo Usui, Kunihiko Takao, Masao Mizukami, Masaru Ito, Masahiro Moritaka
  • Apparatus for measuring refrigerant flow rate in refrigeration cycle
    Patent number: 4653288
    Abstract: A refrigerant flow rate measuring apparatus has a means for detecting the opening degree A of an expansion valve of a refrigeration cycle, a pressure detecting means for detecting the refrigerant pressure Pi at upstream side of the expansion valve, a pressure detecting means for detecting the refrigerant pressure Po at downstream side of the expansion valve, a refrigerant density detecting means for detecting the density .gamma.i of the refrigerant at the inlet side of the expansion valve, a converting means for directly or indirectly converting the values detected by the detecting means into electric signals, and a calculating means for calculating the flow rate of the refrigerant in accordance with the following formula, from the electric signals.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: March 31, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Kosaku Sayo, Seijiro Tani, Seigo Miyamoto, Kenji Emi, Toshihiko Fukushima
  • Refrigerant flow control device
    Patent number: 4617804
    Abstract: In a refrigeration cycle in which the opening of the expansion valve is controlled by the super-heat degree of the refrigerant periodically detected at the outlet of the evaporator, a negative control signal is produced to rapidly change the opening of the expansion valve when the detected super-heat degree has reached zero. As a result, occurrence of the liquid back is prevented.
    Type: Grant
    Filed: January 23, 1986
    Date of Patent: October 21, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Toshihiko Fukushima, Seigo Miyamoto, Kosaku Sayo, Kenji Emi