Patent ID: 8528627

Claim:
An air-guiding cover mounted outside of a cylindrical heat-dissipating body with a venting channel, a portion of the center of the heat-dissipating body being hollow through the entire length thereof, the air-guiding cover comprising: a hollow cylinder surrounding the heat-dissipating body; and an air-guiding plate extending inwardly from an inner wall of the cylinder and accommodated in the venting channel to divide the venting channel into a first and a second air flow channels, the air-guiding plate being separate from a fan frame, wherein the air-guiding plate is helically inclined to the inner wall of the cylinder such that air entering the hollow cylinder is guided into the first air flow channel by a first surface of the air-guiding plate in a direction essentially along the length of the hollow cylinder and is diverged to run essentially perpendicular to the length of the hollow cylinder into heat-dissipating paths of the heat-dissipating body, and after the air flows out of the heat-dissipating paths, the air runs into the second air flow channel to be guided by a second surface of the air guiding plate that is opposite to the first surface to exit the hollow cylinder back to the direction essentially along the length of the hollow cylinder.