Patents by Inventor Keiju Sakaino

Keiju Sakaino 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).

  • Patent number: 5346375
    Abstract: A discharge valve is incorporated into a scroll compressor for use in a refrigerator or an air conditioner. A valve element seating surface having a concave cylindrical shape is formed in the upper surface of the stationary disk of the stationary scroll plate of the scroll compressor, a discharge port is formed through the stationary disk of the stationary scroll plate so as to open in the valve element seating surface, and a discharge valve element having a cylindrical shape conforming to the concave cylindrical shape of the valve element seating surface is seated on the valve element seating surface so as to open or close the discharge port. The valve element seating surface having a concave cylindrical shape facilitates machining the stationary scroll plate, reduces the top clearance of the scroll compressor without reducing the rigidity of the stationary disk, prevents the concentration of stress on the delivery valve, and improves the reliability of the delivery valve.
    Type: Grant
    Filed: November 23, 1992
    Date of Patent: September 13, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuyuki Akiyama, Yoshinori Shirafuji, Keiju Sakaino
  • Patent number: 4780067
    Abstract: A multicylinder rotary compressor has a plurality of cylinders housing rolling pistons which are rotated inside the cylinders by a common crankshaft. Each cylinder has a separate suction pipe. At least one of the suction pipes has a check valve which may be closed to unload the cylinder to which the suction pipe is connected. The check valve has a housing and a slider which can slide inside the housing between an open position and a closed position. The check valve may be closed by introduction of high-pressure refrigerant gas into the space beneath the slider to push it to the closed position when a cylinder is to be unloaded. In another form of the invention, the check valve is closed by a spring made of a shape-memory alloy and a heater for heating the spring above a prescribed temperature at which the allow changes shape. When a cylinder is to be unloaded, the heater is turned on, and the shape-memory alloy deforms into a shape such as to force the slide to the closed position.
    Type: Grant
    Filed: September 28, 1987
    Date of Patent: October 25, 1988
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Sou Suzuki, Keiju Sakaino, Katsuyuki Kawasaki, Yoshinori Shirafuji, Hiroshi Ogawa, Hiroyuki Nagashima
  • Patent number: 4745777
    Abstract: A refrigerating cycle apparatus of an improved operating efficiency, which is constructed, in combination, with: a refrigerant circuit including an evaporator, a compressor, a condenser, a first throttle, an economizer for separating the refrigerant into a gas phase and a liquid phase, and a second throttle, all these component elements being interconnected in the order as mentioned; and a piping for the economizer, which connects the gas phase portion of the economizer and an intermediate pressure region of the compressor, wherein the length of the economizer is set in such a value that is greater than the values to be determined from a Mollier's diagram on the basis of the operating conditions for the refrigerating cycle apparatus for the increase in the cooling or warming capability as well as the increase in the coefficient of performance.
    Type: Grant
    Filed: March 31, 1987
    Date of Patent: May 24, 1988
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Etsuo Morishita, Keiju Sakaino, Masayuki Kakuda
  • Patent number: 4487555
    Abstract: A hermetic motor compressor including a closed housing which covers motor and compressor means; and a partition wall which separates a lower temperature compartment in which at least part of a motor is held and a recycling coolant is fed through an inlet port formed on said housing; and a higher temperature compartment in which a compressor and a coolant muffler and a loop part of an outlet pipe are held.
    Type: Grant
    Filed: December 14, 1981
    Date of Patent: December 11, 1984
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Okinobu Ohinata, Takuho Hirahara, Keiju Sakaino, Yawara Uzawa, Nobuhiro Shimizu, Shigeru Shida
  • Patent number: RE36604
    Abstract: A scroll type compressor comprising: a crankshaft having an eccentric shaft portion formed thereon; an orbiting scroll which is given torque by the crankshaft through the eccentric shaft portion; and bearing means for rotatably supporting the crankshaft; wherein at least one of the eccentric shaft portion and the bearing means is constituted by a rotatably engaged bushing and a curved surface portion.
    Type: Grant
    Filed: June 23, 1995
    Date of Patent: March 7, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Fumiaki Sano, Masahiko Oide, Toshiyuki Nakamura, Norihide Kobayashi, Hiroshi Ogawa, Yoshinori Shirafuji, Takashi Yamamoto, Keiju Sakaino