| 摘要 |
A rotary compressor, expansion engine, or the like. Two interengaging rotors rotate in a casing structure. The optimum number of lobes per rotor is two for pressure ratios up to about three. The first rotor has end plates thereon which open and close larger ports in the end walls. Low pressure dump pockets are formed twice per rotation and these have now been determined to have negligable loss. The first rotor has lobes of small angle so as to reduce a precompression loss. The second rotor has lobes of larger angle so as to improve performance. An interchamber throttling loss has now been reduced. When operating as a compressor machine, the discharge ports start to be uncovered about 15 degrees early for better performance.
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