| 摘要 |
A cylindrical rotor journalled in a housing has an even number of vanes slidable in slots in the rotor and adapted to sealingly engage the inside wall surface of the housing to form working chambers between the rotor, said wall surface and the vanes, the rotor being provided with recesses adapted to cooperate with outlet parts in the end walls of the housing to form outlet passages for compressed gas. Piston means are located radially inside each of these recesses and connected to a diametrically opposed vane, each piston means being movable into the corresponding recess by said vane so as to fill up the recess and thereby force the gas therein out through the corresponding outlet port.
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