Refrigerant compressed by a first stage compression elements (30) run by a motor (20) is discharged in the closed container (10) via a silencer chamber (35) to cool the motor (20) before the refrigerant is led to a second stage compression element (40). The refrigerant is discharged from the second stage...http://www.google.de/patents/US20030126885?utm_source=gb-gplus-sharePatent US20030126885 - Multistage compressor
