Variable geometry turbine

Abstract

A variable geometry turbine comprising: a housing; a turbine wheel supported within said housing for rotation about a turbine axis; an annular inlet passage within said housing upstream of said turbine wheel and defined between respective radial inlet surfaces of first and second wall members; an outlet passage within said housing downstream of said turbine wheel; an array of vanes extending across the inlet passage, said vanes being connected to said first wall member; at least one of said first and second wall members being moveable along the turbine axis to vary the size of the inlet passage and / or at least one of said vanes being rotationally moveable about an axis that is substantially parallel to said turbine axis to vary the size of the inlet passage; wherein at least one particulate filter is provided within said housing at a location such that said particulate filter can be contacted by particulate matter flowing through said turbine during use.

Description

technical field [0001] The present invention relates to a variable geometry turbine, such as a variable geometry turbocharger, and particularly, but not exclusively, to a variable geometry turbine usable in a diesel generator internal combustion engine. The invention also relates to a nozzle ring for use in a variable geometry turbine. Background technique [0002] A turbocharger is a well known device for providing air at a pressure above atmospheric pressure (boost pressure) to the intake of an internal combustion engine. Conventional turbochargers essentially consist of a housing in which exhaust gases are provided to drive a turbine wheel mounted on a rotatable shaft connected downstream of the exhaust manifold of the engine. The rotating turbine wheel rotates the compressor wheel mounted on the other end of the shaft. The compressor wheel delivers compressed air to the engine exhaust manifold. The turbocharger shaft is usually supported by radial thrust bearings, inc...

AI Technical Summary

Problems solved by technology

While providing bypass flow passages and pressure equalization holes can improve the performance of variable geometry turbines under many different operating conditions, providing such configurations will cause turbine components such as nozzle ring actuator rods, bushings, seal rings and Nozzle annulus, exposed outside the turbine inlet passage for exhaust emissions, which can lead to the accumulation of particulate matter on these components

Accumulation of deposits on these components will likely result in stickiness and / or reduction in the attainable stroke of the nozzle ring

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