Hitachi, Ltd.

Hajime Arai

Akira Arai

Riichi Uchida

Katsumi Matsubara

Hidetomo Mori

Haruo Mishina

Eiji Yokoyama

Screw fluid machines are for use as a compressor for generating high pressure gas, a cooling-medium-compressing compressor for use in a refrigerator or an air conditioner. The fluid machine includes a rotor casing, two side-casings, a pair of screw rotors, and accessories such as silencer, a gas cooler, an oil cooler, and an oil tank. The rotor casing includes an outer wall, an inner wall and interconnecting members or ribs which interconnect the outer wall and the inner wall, with a space being provided between the outer wall and the inner wall. This space is partitioned into two or more spaces by means of the aforesaid interconnecting members. A working chamber or space is provided inwardly of the inner wall and has an inlet port and a discharge port. Both side-casings are secured to the opposite end faces of a rotor casing through the medium of flanges and are provided with a passage adapted to bring two or more spaces thus partitioned, into communication with each other. A pair of rotors are housed in meshing relation in a working chamber in the rotor casing. In addition, accessories are housed in spaces thus partitioned.

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Ibaraki, Japan

Hajime Arai