Mitsubishi Jukogyo Kabushiki Kaisha

Yukio Nagato

Tetsuzo Ukai

Makoto Fujitani

Toshiyuki Shikanai

Takahide Ito

Kimiharu Takeda

Katsumi Hirooka

Object: To provide a high performance scroll type fluid machine in which machining is facilitated, strength of central end portion of scroll wrap is high enough, volume of the innermost compression chamber becomes zero and yet compression efficiency does not lower. Solving means: A central end portion profile of spiral wrap of each scroll (1, 2) is formed in a step-like shape having at least two steps (1A, 1B and 2A, 2B), the central end portion profile of each said step is made in a complete engagement profile and thickness of said step-like spiral wrap is made thinner at the upper step leaving an end plate.

Scroll type fluid machine having spiral wraps formed in a step-like shape

The present invention relates to a scroll type compressor. The compression gas in a discharge chamber is made to flow into a backside small sealed chamber through a leak passage provided before the position on the revolution angle of the revolving scroll, whereat the back side of a volute wrap of the revolving scroll starts to cross a discharge opening and at the same time a pair of small sealed chambers begin to communicate with the discharge chamber.

Scroll type compressor having a leak passage for the discharge chamber

An inexpensive, efficient pump which can supply lubricating oil uses the revolving motion of an orbiting scroll 2. The pump is so constructed that a piston supported by a fixing member 1 is fitted in a cylinder chamber 102 formed in the inner surface of the end plate 21 of an orbiting scroll 2 which revolves while sliding on the fixing member, by which a pump chamber 104 is defined between them. The piston 101 is extended or retracted depending on the revolving motion of orbiting scroll 2, the volume of the pump chamber 104 is increased or decreased, and a fluid suction port 105 and a fluid discharge port 106 are connected to the pump chamber 104 at predetermined time intervals to supply the fluid.

Growing community of inventors

Nagoya, Japan

Yukio Nagato