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A rotary compressor having a housing defining a chamber with a curved outer wall of substantially elliptical profile containing a rotor of cylindrical shape having a plurality of vanes profiled to fit the chamber and radially slidable in grooves in the rotor to define enclosed compartments between t

A rotary compressor having a housing defining a chamber with a curved outer wall of substantially elliptical profile containing a rotor of cylindrical shape having a plurality of vanes profiled to fit the chamber and radially slidable in grooves in the rotor to define enclosed compartments between them. Each vane has a pair of axially extending stubshafts having rollers respectively mounted thereon. Roller tracks formed in the end walls of the chamber accommodate the rollers for guiding the vanes so that the outer edges of the vanes follow the outer wall of the chamber in closely spaced engagement. Inlet and outlet ports located in the curved outer wall of the chamber closely straddle a reference region. The rotor has its axis laterally offset from the chamber for engagement at the reference region for sealing between the ports, the rotor axis being offset toward the outlet port and being spaced along both the major and minor axes of the elliptical profile by sufficient amounts that each vane undergoes but a single in and out stroke during each revolution of the rotor notwithstanding the elliptical nature of the chamber. In the preferred construction the rollers ride in grooves having radially opposed walls formed in the respective end walls of the chamber, with the radially inward wall having substantially constant radial clearance with respect to the contained rollers thereby to determine the amount that each vane can move radially inward under starting conditions and in the face of “slugging”.

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A rotary compressor comprising in combination a housing defining a chamber having opposed parallel end walls and a curved outer wall, the outer wall having a reference region between inlet and outlet sides of the chamber, said inlet and outlet sides having a substantially elliptical profile having m

A rotary compressor comprising in combination a housing defining a chamber having opposed parallel end walls and a curved outer wall, the outer wall having a reference region between inlet and outlet sides of the chamber, said inlet and outlet sides having a substantially elliptical profile having major and minor axes centered on the chamber axis, a rotor of cylindrical shape having a plurality of equally spaced radial grooves formed therein and having a shaft supporting the same for rotation in the housing, vanes profiled to fit the chamber and radially slidable in the grooves to define enclosed compartments between them, each vane having a pair of axially extending stubshafts having rollers respectively mounted thereon, roller tracks formed in the end walls of the chamber for accomodating the rollers and for guiding the vanes so that the profiled outer edges of the vanes follow the outer wall of the chamber in closely spaced engagement, means defining an inlet port on the inlet side of the chamber for aspiration of gas into a compartment and an outlet port on the outlet side for discharging gas from the compartment in the compressed state, the ports being located in the curved outer wall of the chamber and positioned to closely straddle the reference region, the rotor having its axis laterally offset from the chamber axis for sealing engagement at the reference region for sealing between the ports, the rotor axis being offset toward the outlet port and the rotor axis being spaced along both the major and minor axes of the elliptical profile by sufficient amounts that each vane undergoes but a single in and out stroke during each revolution of the rotor notwithstanding the elliptical nature of the chamber.