Patent ID: 8079801
Filing Date: 2011-12-20
Classification: F04D

Abstract:
1. A serial axial fan unit comprising: a first axial fan and a second axial fan connected to and arranged coaxially with a center axis of the serial axial fan unit, wherein each of the first axial fan and the second axial fan includes: a motor including a base portion arranged adjacent to the other axial fan; an impeller including a plurality of blades which are radially arranged about the center axis and extend outward in a radial direction substantially perpendicular to the center axis, the impeller being rotatable about the center axis to create an axial air flow; a housing surrounding the impeller; and supporting ribs extending from the base portion of the motor outward in the radial direction and connecting the base portion to the housing; wherein the first axial fan and the second axial fan are arranged with their base portions adjacent to and facing each other with a motor gap therebetween in an axial direction substantially parallel to the center axis; and a lower end surface of the housings of the first axial fan is arranged to only be in contact with an upper end surface of the housing of the second axial fan through substantially an entire periphery of the lower end surface of the housing of the first axial fan and substantially an entire periphery of the upper end surface of the housing of the second axial fan.