Device to supply gas for respiration; has drive unit and impeller with several blade channels separated by blades, where width of blade channel is 0.1 - 6.5 of impeller circumference

摘要

The device has a fan unit, which has a drive unit and an impeller (1). The impeller has several blade channels separated by blades (3,4). The number of blades is fixed, so that the blade channel width at the outer edge is 0.1% - 6.5% of the circumference of the impeller. Preferably, the impeller is a radial impeller. The blades have different blade depths, with shorter and longer blades alternating. An Independent claim is included for an impeller.