| 摘要 |
A positive displacement, transverse flow, internally refluxing, rotary gas compressor which operates on a constant volume, variable mass, near-isothermal compression cycle. The compressor includes a pair of involutely lobed, intermeshed impellers that sweep gas from an intake port through the compressor housing to a discharge port in constant volume displacement cavities that are defined by the lobes of the impellers and the compressor housing walls. The cavities are effectively sealed against both the intake and discharge ports over upstream interior housing sidewall portions that extend from the intake port over an angle at least as great as the angle between adjacent lobes of the impellers. Downstream therefrom the interior housing sidewalls are spaced radially from the rotating impellers so as to allow limited reflux counterflow of discharge gas back into the advancing displacement cavities. The refluxing gas isentropically expands into the constant volume displacement cavities so that the pressure of the gas contained in the displacement cavities approaches that of discharge. The final pressure increase with accompanying volume reduction into discharge is gained by adiabatic compression at a low pressure ratio as each cavity opens into discharge. The resulting process is noncontaminating and more energy efficient than compression by volume reduction alone.
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