POWER TURBINE UNIT

摘要

A power turbine unit includes a turbine housing, an exhaust duct, a turbine wheel with blades positioned in the exhaust duct, a shaft rigidly connected to the turbine wheel and rotatably supported in the housing, and an oil sealing system. The oil sealing system includes a sealing arrangement positioned in the vicinity of the turbine wheel for preventing oil from escaping from the turbine housing along the shaft to the exhaust duct. The oil sealing system further includes a buffer gas duct that is arranged to supply exhaust gas from the exhaust duct to the sealing arrangement for pressurizing the sealing arrangement.

主权项

1. Power turbine unit (2) comprising
a turbine housing (17a, 17b), an exhaust duct (18), a turbine wheel (6) with blades positioned in said exhaust duct (18), a shaft (16) rigidly connected to said turbine wheel (6) and rotatably supported in said housing (17b), and an oil sealing system comprising a sealing arrangement (37) positioned in the vicinity of the turbine wheel (6) for preventing oil from escaping from said turbine housing (17b) along said shaft (16) to said exhaust duct (18), characterised in that said oil sealing system comprises a buffer gas duct (40) that is arranged to supply exhaust gas from said exhaust duct (18) to said sealing arrangement (37) for pressurizing said sealing arrangement (37).