Turbocharger
AssigneeIHI Corporation
InventorYoshimitsu Matsuyama
Life of this patent
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Abstract
Turbulence of exhaust gas in a turbine impeller outlet is reduced with a simple structure to improve efficiency of a turbine. A sealing device 25 for prevention of exhaust gas in a scroll passage 8 from leaking via a gap 19 to a turbine impeller 4 is arranged upstream, in a travel direction of the exhaust gas, of through-holes 24 via which the vane shafts 16b extend through a rear exhaust introduction wall 11, whereby pressure P2 in a gap 19 communicating with the through-holes 24 of the rear wall 11 is kept lower than pressure P1 in an exhaust nozzle 9 so as to displace nozzle vanes 15 to the rear wall 11.
Claims2
A turbocharger with a turbine housing having a scroll passage outwardly of an exhaust nozzle which in turn is arranged outwardly of a turbine impeller rotatably supported on a bearing housing and serves for guiding exhaust gas from the scroll passage to the turbine impeller, said exhaust nozzle having a plurality of nozzle vanes between front and rear exhaust introduction walls on sides of the bearing and turbine housings, respectively, vane shafts fixed to opposite sides of each of said nozzle vanes extending through the front and rear walls and being rotatably supported, the rear wall being arranged to have a gap between said rear wall and the turbine housing,
- characterized in that a sealing device for preventing the exhaust gas from said scroll passage from leaking via said gap to the turbine impeller is arranged upstream, in a travel direction of the exhaust gas, of through-holes via which the vane shafts extend through the rear wall, whereby pressure in said gap communicating with said through-holes of the rear wall is kept lower than pressure in the exhaust nozzle so as to displace the nozzle vanes to the rear wall.
Dependencies are inferred from the claim text.