Turbine inlet scroll

Details Turbine inlet scroll Turbine inlet scroll

2000-05-10

2001-10-16

Verdier, Christopher (Department: 3745)

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Plural distributing means immediately upstream of runner

C415S191000, C415S189000, C415S205000, C415S209200, C415S210100, C415S204000, C417S409000

Reexamination Certificate

active

06302647

ABSTRACT:

TECHNICAL FIELD
This invention relates to engine exhaust driven turbochargers and more particularly to a turbine inlet scroll and duct for conducting pressurized exhaust gas from an engine exhaust system to an annular inlet of a turbine wheel.
BACKGROUND OF THE INVENTION
It is known in the art relating to engine turbochargers to provide an inlet duct which changes from an open conduit to an annular passage for delivering pressurized exhaust gas to the inlet of an exhaust turbine with relatively even pressure and flow distribution around the turbine annular inlet. In the case of an offset exhaust system connection, the inlet duct has been joined with an annular scroll that provides a plenum-like volume to evenly distribute the exhaust gas through angled vanes of an nozzle ring to the energy converting blades of a turbine wheel. Where a relatively short axial distance is allowed for connecting an exhaust manifold with a laterally offset turbine inlet to a free wheeling turbine, the even distribution of exhaust gas to an annular turbine inlet from a minimal plenum area requires specific design of the annular passage portion of the inlet scroll.
SUMMARY OF THE INVENTION
The present invention provides a relatively short coupled turbine inlet scroll and duct wherein an inlet portion connectable with an engine exhaust manifold is ducted through a generally S-shaped passage to a laterally offset position where the passage is merged into an annular outlet connectable with a turbine inlet nozzle ring. An outer wall of the scroll defines the generally S-shaped passage while an inner wall in the outlet end of the passage converts the open passage to an annular passage configuration.
Struts are provided between the outer wall and the inner wall to support the inner wall within the outlet portion of the inlet scroll. The shapes of the outer and inner walls are developed to effectively diffuse the exhaust gas leaving the engine exhaust manifold to a larger annular exit area in an efficient manner. However, the relatively compact form and tight curves of the short-coupled inlet scroll cause difficulties in turning the exhaust gas back to the axial flow direction and maintaining even distribution of the gas to the turbine inlet. These problems are reduced by forming the struts with aerodynamic shapes that reduce turbulence in the gas flow and by properly positioning and shaping some of the ducts as flow directing vanes. The vanes then assist the configurations of the walls in redirecting and evenly distributing the exhaust gas across the annular portion of the passage for distribution to the connected turbine inlet.
These and other features and advantages of the invention will be more fully understood from the following description of certain specific embodiments of the invention taken together with the accompanying drawings.


REFERENCES:
patent: 2932156 (1960-04-01), Eckert et al.
patent: 5868553 (1999-02-01), Battig et al.

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