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Method and apparatus for reducing noise in a roots-type blower

  • US 20050112013A1
  • Filed: 11/10/2004
  • Published: 05/26/2005
  • Est. Priority Date: 08/04/2003
  • Status: Abandoned Application
First Claim
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1. A noise reducing configuration for a Roots-type blower comprising:

  • a housing defining a rotor chamber, said rotor chamber comprising having an inlet and an outlet;

    a first and a second rotor rotatably mounted in said chamber, each rotor defining a plurality of lobes, adjacent lobes of each rotor cooperating with said housing to define at one or more times gas transport chambers, said rotors configured to move gas from said inlet via said gas transport chamber to said outlet; and

    at least one outlet gas flow channel extending from said outlet along an inner surface of said housing at said rotor chamber in a direction opposite a direction of rotation of said rotor, said at least one outlet gas flow channel configured to permit gas to flow from said outlet into a gas transport chamber as said lobes of said rotor rotate towards said outlet, said at least one outlet gas flow channel configured so that a pressure of said gas in said chamber as said chamber moves towards said outlet changes at an approximately linear rate.

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