| 摘要 |
<p>A vane-type rotary fluid displacing device (1) including an external member (2) co-operating with an internal member (3), the members being relatively rotatable about a common axis, the external member (2) having an internal peripheral surface and the internal member (3) having an external peripheral surface, the surfaces being opposed, one of which peripheral surfaces has a sinuous profile (9) additionally including first and second arcs (10, 11), the other peripheral surface having a substantially circular profilem wherein said member having the substantially circular profile has at least one diametrically opposed vane (12) slidably received therein; said first arc (10) having a radius of curvature fractionally greather than a distance from the axis of rotation to said external peripheral surface of said internal member; said second arc (11) having a radius of curvature larger than that of said first arc (10) by the extent of the maximum excursion of said vane (12) beyond said other peripheral surface; wherein said vane (12) is adapted to continuously contact and sweep the peripheral surface of the other member, such that upon relative rotation of the members, the or each vane (12) slides in the member having said other peripheral surface as the vane sweeps said one peripheral surface; wherein the or each vane (12) together with said peripheral surfaces form a plurality of chambers (20), and an inlet (4) provided in one said chamber and an outlet (5) provided in another said chamber whereby, in use, fluid may be drawn into said one chamber (20) through said inlet (4) and discharged from said other chamber through said outlet (5) by the sweeping action of said or each vane.</p> |
