Air supply device for the compressor of a supercharged internal combustion engine

The device has a tubular air admitting pipe (2) connected to an air inlet (3) of a casing (4) of a compressor. The tubular pipe has a convergent tubular part, relatively in direction of air flow, with edge having lesser diameter being adjacent to the air inlet of the casing of the compressor. The edge is directly connected to the air inlet of the casing of the compressor.