Fan unit including tapered airflow passage

Details Fan unit including tapered airflow passage Fan unit including tapered airflow passage

2011-05-24

2011-05-24

Nguyen, Ninh H (Department: 3745)

Rotary kinetic fluid motors or pumps

Plural runners supported for relative motion or on separate...

Serially spaced in working fluid flow path

C415S220000, C415S219100, C416S128000, C416S19800R

Reexamination Certificate

active

07946805

ABSTRACT:
An axial fan unit includes two or more impellers which rotate about a center axis in opposite directions relative to each other to create an axial airflow. Each impeller includes a hub and a plurality of blades disposed around the hub. The impellers are surrounded by a housing in a radial direction that is perpendicular or substantially perpendicular to the center axis. On a cross-sectional plane of the axial fan unit including the center axis, a distance between the hubs of the impellers and the housing decreases from an upstream side to a downstream side in a direction of the axial airflow.

REFERENCES:
patent: 2339602 (1944-01-01), Hagen
patent: 2384000 (1945-09-01), Wattendorf
patent: 7156611 (2007-01-01), Oosawa et al.
patent: 2406089 (2000-11-01), None
patent: 2002-344182 (2002-11-01), None
patent: 2004-278370 (2004-10-01), None
patent: 2004-278371 (2004-10-01), None

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