| 摘要 |
A rotary positive displacement engine includes one or more power rotors (20, 28) acted upon by a pressurized gas, and an annular barrier rotor (52) geared for synchronous rotation with the power rotors. The power rotors (20, 28) have cylindrical outer surfaces (22, 30) having opposed and extended vanes (24, 26, 32, 34) acted upon by the powering charge. The barrier rotor (52) forms a charge delivery mechanism and a barrier between the exhaust ports (82) and the expanding gas powering the engine. Within the barrier rotor (52) is a stator (70) which has ports (72, 73) in fluid communication with the ports (62, 64) in the barrier rotor (52) for delivering the powering charge to the rotors when the respective ports (62, 64, 72, 73) are aligned. The location of the barrier rotor (52) is adjustable with respect to the power rotors (20, 28) to permit the clearances (81, 83) between the barrier rotor outer surfaces (54) and the power rotors outer surface (20, 28) to be adjusted to extremely tight tolerances, to provide high efficiency operation with low exhaust gas contaminations.
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