Rotary fluid machinery

A rotary fluid machine for a high-pressure gas-phase operating medium comprising:

• a casing having a rotor chamber,
• a rotor accommodated in said rotor chamber, and
• a plurality of vanes supported for reciprocal movement in slot-shaped spaces defined in said rotor radially about a rotational axis of said rotor, wherein said rotor chamber is divided into a plurality of mutually adjacent chamber section by cooperation of the casing, rotor and vanes, said rotor is rotated through said vanes by the expansion of the high-pressure gas-phase operating medium supplied into to the rotor chamber,
• wherein a static-pressure bearing is formed in said slot-shaped space between said rotor and said vane, so that said vane is supported in a floated state by the static-pressure bearing and that a sealed state of the high-pressure gas-phase operating medium supplied into each of the chamber sections against the operating medium within adjacent chamber sections is kept by the static-pressure bearing.

A rotary fluid machine comprising:

• a casing having a rotor chamber,
• a rotor accommodated in said rotor chamber,
• and a plurality of vanes reciprocally movably supported in slot-shaped spaces defined in said rotor radially about a rotational axis of said rotor, wherein said rotor is rotated through said vanes by the expansion of a high-pressure gas-phase operating medium supplied into said rotor chamber,
• wherein annular sealing means are disposed between side faces of said rotor and an inner surface of said casing and biased from one of said rotor and said casing toward the other member, and a pressurized liquid-phase fluid is supplied between said other member toward which the annular sealing means is biased and said sealing means to form a static-pressure bearing, thereby preventing the leakage of the gas-phase operating medium from said rotor chamber.