Patent ID: 8307648

Claim:
A compressor ( 16 ) for an internal combustion engine ( 10 ), having a housing ( 34 ) with an inflow channel ( 36 ); a compressor impeller ( 38 ) with an inlet ( 50 ) arranged in the inflow channel ( 36 ); a bypass channel ( 30 ) which has a first flow opening ( 48 ) upstream of the compressor impeller inlet ( 50 ), a second flow opening ( 52 ) downstream of the compressor impeller inlet ( 50 ) and an axial annular chamber ( 54 ) which extends between the first and the second flow openings; an axial guide vane structure ( 32 ) arranged in the axial annular chamber ( 54 ) of the bypass channel ( 30 ) so as to impart to the air flowing through the bypass channel from the second to the first flow opening ( 52 , 48 ) a swirl corresponding to that of an air mass flow through the inflow channel ( 36 ) in the proximity of the pumping limit of the compressor ( 16 ), said axial guide vane structure ( 32 ) having a narrowest flow cross section (A 32 ) which is not larger than a flow cross section (A 52 ) of the second flow opening ( 52 ) of the bypass channel ( 30 ).