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Turbine with variable inlet nozzle geometry

A technology for turbines and turbine impellers, applied in the field of turbochargers and variable turbochargers, can solve the problems of increased nozzle ring load and difficulty in guaranteeing

Active Publication Date: 2009-01-07
CUMMINS TURBO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] A possible problem with controlling the position of the nozzle ring with very small inlet widths, whether operating in engine braking mode (with or without a decompression braking system) or in exhaust heating mode, is that, as it approaches the closed position, Its load on the nozzle ring can increase rapidly
It can also be difficult to always have the best minimum flow through the turbine when the nozzle ring is in the fully closed position

Method used

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  • Turbine with variable inlet nozzle geometry
  • Turbine with variable inlet nozzle geometry
  • Turbine with variable inlet nozzle geometry

Examples

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Embodiment Construction

[0064] Referring to FIG. 1 , the variable turbocharger shown includes a variable turbine housing 1 and a compressor housing 2 connected to each other through a central bearing housing 3 . A turbocharger shaft 4 extends from the turbine housing 1 to the compressor housing 2 through the bearing housing 3 . The turbine wheel 5 is mounted on one end of the shaft 4 for rotation in the turbine housing 1 and the compressor wheel 6 is mounted on the other end of the shaft 4 for rotation in the compressor housing 2 . The shaft 4 rotates about a turbocharger axis 4a on a bearing assembly in a bearing housing.

[0065] The turbine housing 1 defines an intake chamber 7 (typically scroll-shaped) into which gas is delivered from an internal combustion engine (not shown). Exhaust gas flows from the inlet chamber 7 to the axial outlet channel 8 via the annular inlet channel 9 and the turbine wheel 5 . The inlet channel 9 is delimited on one side by a radial wall surface 10 of a movable annu...

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Abstract

The invention provides a variable turbine. The variable turbine comprises a turbine wheel supported in a housing for rotation about a turbine axis with an annular inlet passageway defined between a radial face of a movable nozzle ring and a facing wall of the housing. The nozzle ring is movable along the turbine axis to vary the width of the inlet passageway. A substantially annular rib is provided either on the face of the nozzle ring (such that the minimum width of the inlet passageway is defined between the rib and a the facing wall of the housing) or on the facing wall of the housing (such that the minimum width of the inlet passageway is defined between the rib and the nozzle ring).

Description

technical field [0001] The present invention relates to a variable geometry turbine and a method of controlling the variable geometry turbine. In particular, but not exclusively, the present invention relates to variable turbochargers, and more particularly to turbochargers operative to control engine braking or to affect the temperature of the exhaust gases of an internal combustion engine. 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). A conventional turbocharger basically consists of an exhaust gas driven turbine wheel mounted on a rotatable shaft within a turbine housing connected downstream of the engine outlet manifold. Rotation of the turbine wheel rotates a compressor wheel mounted on the other end of the shaft within the compressor housing. The compressor wheel delivers compressed air to the engine inlet manifold. The turbocharge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D17/14F01D17/16
CPCF01D17/141F01D17/165F05D2220/40F01D17/143F01D17/14F01D17/16F02B37/22
Inventor 约翰·帕克
Owner CUMMINS TURBO TECH
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