| 摘要 |
A screw-type compressor/expander including a housing having inlet and outlet ends and two matching profile rotors with male and female lobes helically wrapped to form endless screws is characterized by end plates having spaced ports arranged at each axial end of the rotors and valve gates slidable with respect to other end plates to select either compression mode ports or expansion mode parts. When the expansion mode ports are selected, the rotors and housing enclose spaces initially opening to the inlet end that have a volume that expands as the rotors are turned. When the compression mode ports are selected, the rotors and the housing enclose spaces initially opening at the inlet end and then closing such that the volume of the spaces contracts as the rotors are turned.
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