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Rotary positive-displacement scavenging device for rotary vane pumping machine

  • US 6,244,240 B1
  • Filed: 04/30/1999
  • Issued: 06/12/2001
  • Est. Priority Date: 04/30/1999
  • Status: Active Grant
First Claim
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1. A rotary vane pumping machine comprising:

  • a stator assembly comprising an annular ring, the inner circumferential surface of the annular ring defining a contoured surface of a stator cavity;

    a rotor spinning around a rotor shaft axis, the rotor shaft axis being a fixed rotational axis relative to the stator cavity, the rotor having a plurality of radial vane slots and the rotor and stator being in relative rotation;

    a plurality of vanes, each of the plurality of vanes extending and retracting within a corresponding one of the radial vane slots of the rotor, wherein a pair of adjacent vanes defines a vane cell; and

    a rotary scavenging disk disposed along the annular ring and extending into the vane cell, wherein an outer circumferential edge of the rotary scavenging disk being in sealing proximity with an outer circumferential edge of the rotor, and wherein the rotary scavenging disk contains at least one recess formed along the outer circumferential edge thereof.

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