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Fluid flow rotating machinery of lobe type

  • US 4,145,168 A
  • Filed: 11/12/1976
  • Issued: 03/20/1979
  • Est. Priority Date: 11/12/1976
  • Status: Expired due to Term
First Claim
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1. A fluid flow rotating machine of the lobe type comprising first and second intermeshing rotors having pitch surfaces in sealing tangential contact, said rotors being disposed on parallel axes of rotation and rotating with a common pitch surface speed,at least the first of said rotors having a generally chisel shaped lobe projecting radially outwardly from its pitch surface to terminate in a tip rounded with an arc centered on the center of said first rotor and with a radius equal to the sum of the radius of the pitch surface and the radial height of the lobe, said lobe tip having opposed leading and trailing corners, such lobe being symmetrical and having a cross-sectional base width greater than the width of said tip and not greater than approximately said height,at least said second rotor having a lobe receiving peripheral sealing cavity extending inwardly from said pitch surface making sealing and moving contact with said lobe tip, said cavity having a cylindrical bottom surface coaxial with its pitch surface, a radius equal to the difference between the radius of said second rotor and the height of said lobe, and an arc length equal to that of said lobe tip, the ends of said bottom surface of the cavity being joined to leading and trailing surfaces extending outwardly to said pitch surface and having profiles defined by the leading and trailing corners of said lobe tip as the rotor with the lobe is rolled around the rotor with the cavity without slipping,said lobe having a pair of opposed flanks extending between the leading and trailing corners of the tip and the pitch surface from which the lobe extends, said flanks being spaced from all surfaces of said cavity at all times, so that the only contacts between rotors when said pitch surfaces are not rolling over one another is between the tip of a lobe and the surfaces of the intermeshing cavity,said pitch surface of each rotor having a net undisturbed circumference at least equal to the portion of its circumference interrupted by said lobes and cavities.

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