Rotary fluid-handling mechanism

A rotor (68) internally cylindrically recessed from one end receives, in close fitting, sealing relationship, a stationary cyclindrical support (66) for at least one pair of rotary blades (77). The rotor (68) is provided internally with corresponding cavities (69) helically oriented to receive portions of the respective blades (77) which enter and pass through the respective cavities (69) for compressing or propelling the particular fluid concerned. The rotor and blades are synchronized by a single shaft (70) axially journalled in the cylindrical support (66) and connected by gearing (74, 75) with the rotable mountings of the blades (77). Inflow of fluid internally of the mechanism is provided by diametrically opposite passages (78) flanking the shaft (70) and extending from inflow ports at the one end of the cylindrical support (66) towards the opposite end thereof.