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Roots type blower with reduced gaps between the rotors

  • US 4,666,384 A
  • Filed: 07/25/1986
  • Issued: 05/19/1987
  • Est. Priority Date: 09/30/1983
  • Status: Expired due to Term
First Claim
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1. A Roots type blower of the type comprising intermeshing rotor means including a rotor whose shape constitutes a reduction from an original theoretical base shape, said reduction comprising a combination of primary and secondary reductions, said primary reduction being uniform around the rotor periphery, said secondary reduction being variable along an outer periphery of said rotor in accordance with a cross-angle defined by the intersection of a first line extending normal to a point on said periphery and a second line extending to said point from an axis of rotation of said rotor, such that the secondary reduction is smallest at locations where said cross-angle is zero and becomes larger between said locations.

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