Patent ID: 8226350
Filing Date: 2012-07-24
Classification: F04D

Abstract:
1. A fan apparatus comprising: a casing defined by a hollow member and including an inlet and an outlet a fan unit defined by a plurality of axial fans, the fan unit including an inlet and an outlet; and a duct defined by a hollow member including an inlet and an outlet on an inside of the casing, and the duct is arranged to couple the outlet of the fan unit to the outlet of the casing; wherein the fan unit is arranged on the inside of the casing, the inlet of the fan unit is disposed adjacent to the inlet of the casing, and the fan unit is closer to the inlet of the casing than the outlet of the casing; the duct includes a through hole that has a decreasing thickness such that a portion of the through hole of the duct directly opposed to the outlet of the fan unit has a smaller diameter than a portion of the through hole of the duct adjacent to the outlet of the casing.