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A low noise, axial flow fan particularly suited for use in a turbulent air flow such as the flow exiting an automobile radiator has a band that is secured to the outer ends of the fan blades. The blades are highly forwardly skewed and have an increasing blade angle as a function of blade radius over

A low noise, axial flow fan particularly suited for use in a turbulent air flow such as the flow exiting an automobile radiator has a band that is secured to the outer ends of the fan blades. The blades are highly forwardly skewed and have an increasing blade angle as a function of blade radius over at least the outer portions of the blade. Each blade is secured to the band along its full width. In the preferred form, the band has a cross-sectional shape that acts as a nozzle to accelerate the airflow through the fan, each blade has a cambered, airfoil cross-section, and the entire fan is formed of an injection molded plastic as a single, integral structure.

대표청구항 ▼

A fan particularly suited to low noise operation in a turbulent air flow comprising a hub having a center of rotation for the fan that is aligned in a first direction, a generally circular band concentric with and surrounding the hub, said band extending generally in the first direction, and a plura

A fan particularly suited to low noise operation in a turbulent air flow comprising a hub having a center of rotation for the fan that is aligned in a first direction, a generally circular band concentric with and surrounding the hub, said band extending generally in the first direction, and a plurality of fan blades each secured between said hub and said band, each of said blades: (i) being highly forwardly skewed; (ii) having an increasing blade angle as a function of blade radius over at least the portion of said blade adjacent said band; and (iii) being secured to said band continuously along its width.