| 摘要 |
<p>PROBLEM TO BE SOLVED: To maintain an appropriate clearance between a turbine blade and a shroud ring by considering the mounting structure and shape of the shroud ring in an exhaust turbine supercharger.SOLUTION: An axial flow type exhaust turbine supercharger includes: a gas inlet casing that defines an exhaust gas flow passage; a gas outlet casing 6 communicated with the gas inlet casing via an exhaust gas outlet guide cylinder 5; and a turbine moving blade 7 and a turbine nozzle 8 disposed adjacent to the turbine moving blade, which are located on the upstream side of the exhaust gas outlet guide cylinder. Expansion of exhaust gas introduced to the turbine moving blade through the turbine nozzle causes rotation of the turbine moving blade, and by using axial rotating force obtained by the rotation of the turbine moving blade, a compressor is rotated. A shroud ring 20 that surrounds the turbine moving blade and defines a clearance g with a tip of the turbine moving blade is arranged on the upstream side of the exhaust gas outlet guide cylinder. One peripheral edge side of the shroud ring is fixed to the upstream side of the exhaust gas outlet guide cylinder, and the other peripheral edge side is engaged with the turbine nozzle side so as to enable expansion of the diameter in the radial direction.</p> |
