Variable geometric turbine nozzle ring

Abstract

The invention discloses a nozzle ring used in variable geometric turbine and the variable geometric turbine having the nozzle ring, such as a variable geometric turbocharger; also discloses a method for producing the nozzle ring. The nozzle ring comprises a radial wall which limits a first radial surface; a blade group is extended from the first radial surface; and the first radial surface is extended backwards to form a flange which is located inside or outside while extended along the axial direction; the nozzle ring is an assembly composed of a first part and a second part; the first part comprises a support member for supporting at least one of the blades; the second part is used for limiting the flange located inside or outside while extended along the axial direction, and limiting one or more axially extended apertures which construct the axial flow path of the second part for gases to flow through in use.

Description

technical field

[0001] The invention relates to a nozzle ring for use in a variable geometry turbine and a variable geometry turbine incorporating said nozzle ring, such as a variable geometry turbocharger. More specifically, but not exclusively, nozzle rings may be used in variable geometry turbines of diesel powered internal combustion engines. Background technique

[0002] A turbocharger is a well known device for supplying air to the intake of an internal combustion engine at a pressure above atmospheric pressure (boost pressure). A conventional turbocharger essentially consists of a housing in which an exhaust gas driven turbine wheel is provided mounted on a rotatable shaft connected downstream of the engine outlet manifold. Rotation of the turbine wheel rotates a compressor wheel mounted on the other end of the shaft. The compressor wheel delivers compressed air to the engine inlet manifold. Traditionally, turbocharger shafts are supported by journals and thrust be...

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