Patent ID: 6540479
Filing Date: 2003-04-01
Classification: F04D

Abstract:
An axial flow fan comprising:a first rotor having a first ring with first blades extending radially outward from said first ring, a second rotor having a second ring with second blades extending radially outward from said second ring, said first rotor axially connected to said second rotor; a first stator having a third ring and third blades extending from radially inward from an inner periphery of said third ring, said first rotor and said second rotor received in said third ring and said third blades located between said first blades and said second blades, a plurality of insertions extending from an outer periphery of said third ring of said first stator, and a second stator having recesses for receiving said insertions of said first stator so as to be connected to said first stator and having a fourth ring with fourth blades extending radially inward from an inner periphery of said fourth ring.