Exhaust-gas turbocharger
An exhaust-gas turbocharger ( 1 ) comprising a housing ( 2 ), a turbine wheel ( 5 ) with blades ( 6 ), a compressor wheel ( 4 ) with blades ( 6 ), and a shaft ( 3 ) which is mounted in the housing ( 2 ) and which connects the turbine wheel ( 5 ) and compressor wheel ( 4 ), wherein, in a gap ( 7 ) between the housing ( 2 ) and at least one blade ( 6 ), a contactless labyrinth seal ( 8 ) is formed on the blade ( 6 ) and on the housing ( 2 ), wherein the labyrinth seal ( 8 ) comprises at least one combination of a groove ( 13 ) and a projection ( 14 ).
1. An exhaust-gas turbocharger ( 1 ) comprising:
a housing ( 2 ),
a turbine wheel ( 5 ) with blades ( 6 ) adapted for receiving air radially and discharging air axially,
a compressor wheel ( 4 ) with blades ( 6 ) adapted to drawing air in axially and discharging air radially, and
a shaft ( 3 ) which is mounted in the housing ( 2 ) and which connects the turbine wheel ( 5 ) and compressor wheel ( 4 ),
wherein,
in a gap ( 7 ) between the housing ( 2 ) and at least one blade ( 6 ), a contactless labyrinth seal ( 8 ) is formed on the blade ( 6 ) and on the housing ( 2 ), wherein the labyrinth seal ( 8 ) comprises at least one combination of a groove ( 13 ) and a projection ( 14 ).
2. The exhaust-gas turbocharger as claimed in claim 1 , wherein the labyrinth seal ( 8 ) comprises at least one groove ( 13 ) in the housing ( 2 ) and one projection ( 14 ), which projects into the groove ( 13 ), on the blade ( 6 ), and/or at least one groove ( 13 ) in the blade ( 6 ) and one projection ( 14 ), which projects into the groove ( 13 ), on the housing ( 2 ).
3. The exhaust-gas turbocharger as claimed in claim 1 , wherein the labyrinth seal ( 8 ) comprises multiple combinations of a groove ( 13 ) and a projection ( 14 ) on a blade ( 6 ).
4. The exhaust-gas turbocharger as claimed in claim 1 , wherein the groove ( 13 ) and/or the projection ( 14 ) is arranged at a blade tip ( 15 ) of the blade ( 6 ).
5. The exhaust-gas turbocharger as claimed in claim 1 , wherein the groove ( 13 ) and/or the projection ( 14 ) is arranged on each blade ( 6 ) of the compressor wheel ( 4 ) or turbine wheel ( 5 ).
6. The exhaust-gas turbocharger as claimed in claim 1 , wherein the groove ( 13 ) and/or the projection ( 14 ) is arranged in that half of the blade ( 6 ) of the compressor wheel ( 4 ) which faces toward a compressor outlet ( 9 ).
7. The exhaust-gas turbocharger as claimed in claim 1 , wherein the groove ( 13 ) and/or the projection ( 14 ) is arranged in that half of the blade ( 6 ) of the turbine wheel ( 5 ) which faces toward a turbine inlet ( 10 ).
8. The exhaust-gas turbocharger as claimed in claim 1 , wherein the groove ( 13 ) and/or the projection ( 14 ) is trapezoidal.
9. The exhaust-gas turbocharger as claimed in claim 1 , wherein the groove ( 13 ) and/or the projection ( 14 ) is arranged in the downstream half of the blade ( 6 ) of the compressor wheel ( 4 ).
10. The exhaust-gas turbocharger as claimed in claim 1 , wherein the groove ( 13 ) and/or the projection ( 14 ) is arranged in the upstream half of the blade ( 6 ) of the turbine wheel ( 5 ).