Rotary positive-displacement fluid machines

Details Rotary positive-displacement fluid machines Rotary positive-displacement fluid machines

2000-02-03

2001-10-02

Vrablik, John J. (Department: 3748)

Rotary expansible chamber devices

Positively actuated vane

In opposite directions

Reexamination Certificate

active

06296462

ABSTRACT:

THIS INVENTION relates to rotary positive-displacement fluid machines.
Such as machine is described in patent specification WO 96/39571 in which a rotor is eccentrically mounted in a casing for rotation about an axis the rotor having recesses respectively receiving vanes which oscillate in the recesses as the rotor rotates, each vane being connected by a crank to an arm for oscillation thereon about a vane axis, which arm can oscillate about an axis offset from the rotor axis. The vane axis coincides with the radial inner surface of the casing thus to pivot about the vane tip on a axis which coincides with the radial inner surface of the casing.
According to the present invention there is provided a rotary positive-displacement fluid machine comprising a rotor eccentrically mounted in a casing for rotation about an axis, the rotor having recesses respectively receiving vanes which oscillate in the recesses as the rotor rotates, each vane being connected by a crank to an arm for oscillation thereon about a vane axis, which arm can oscillate about an axis offset from the rotor axis, characterised in that the vane axis is located radially inwards of the radial inner surface of the casing.
The vane tip may be curved about said vane axis. The profile of the curved tip of each vane may be modified to a more flattened shape to ensure clearance from the radial inner surface of the casing at high rotor speeds. The modified profile may comprise one or more flats.


REFERENCES:
patent: 147623 (1874-02-01), Ellis
patent: 4149833 (1979-04-01), Baudin
patent: 2161693 (1973-06-01), None
patent: 2233145 (1974-01-01), None
patent: 0248613 (1987-12-01), None
patent: 2010401 (1979-06-01), None
patent: 2014244 (1979-08-01), None
patent: 96/39571 (1996-12-01), None

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