Blower impeller apparatus with one way valves

摘要

Blower designs for vented enclosures include an impeller having a plurality of blades. A plurality of one way valves are interleaved between the blades to permit substantial airflow only in one direction. One valve design incorporates flaps coupled to either the blades or the impeller body with spring loaded hinges. Another valve design incorporates a flexible flaps coupled to either the blades or the impeller body. In one embodiment, the one-way valves reside on an insertable hub disposed within an inner periphery of the impeller such that the valves and blades are interleaved. The valves close to restrict air flow when the impeller rotational speed is below a threshold range. The valves open to permit air flow when the rotational speed exceeds the threshold range.