US 6,202,413 B1Granted

Multiple nozzle ejector for wastegated turbomachinery

AssigneeCummins Engine Company, Inc.

InventorsGlenn L. Baker, Gregory H. Henderson, P. Douglas Free

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Abstract

An improved wastegated turbocharger including ejector nozzles such that the bypassed exhaust flow re-enters the main exhaust flow at a predetermined pitch angle and yaw angle so as to create a drop in turbine back pressure. The exhaust gas turbocharger includes a turbine housing having a turbine chamber, an exhaust housing portion, and an exhaust gas inlet to said turbine chamber wherein a turbine wheel is rotatably mounted in the turbine chamber and is rotatably responsive to exhaust gas flow from the exhaust gas inlet. In one embodiment, an outlet insert is provided which is rigidly attached to the exhaust housing portion and extends toward the turbine chamber thereby defining a bypass chamber and providing an exhaust gas outlet. A bypass flow passage which fluidly connects the exhaust gas inlet with the bypass chamber is also provided. The outlet insert includes a plurality of ejector nozzles for directing exhaust flow from the bypass chamber to the exhaust gas outlet. In another embodiment, an ejector nozzle ring with plurality of ejector nozzles is positioned between the turbine chamber and the outlet insert.

Claims9

Dependent claims

An exhaust gas turbocharger comprising:

a turbine housing having a turbine chamber, an exhaust housing portion, and an exhaust gas inlet communicating with said turbine chamber;
a turbine wheel rotatably mounted in said turbine chamber, said turbine wheel being rotatably responsive to exhaust gas flow from said exhaust gas inlet across said turbine wheel;
an outlet insert positioned within said exhaust housing portion and extending toward said turbine chamber thereby providing an exhaust gas outlet and defining a bypass chamber, an end of said outlet insert being spaced at a predetermined distance from said turbine chamber thereby forming an annular nozzle ring receiving area;
an ejector nozzle ring disposed in said annular nozzle ring receiving area, said ejector nozzle ring including a plurality of ejector nozzles for directing exhaust flow from said bypass chamber to said exhaust gas outlet, each of said plurality of ejector nozzles including a substantially tubular passage having a width dimension which is substantially equal to a height dimension;
a bypass flow passage fluidly connecting said exhaust gas inlet with said bypass chamber;
and
a valve positioned to control flow through said bypass flow path.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/244,048Filed 4 Feb 1999
Granted: 20 Mar 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F02C 3/32
Gas-turbine plants characterised by the use of combustion products as the working fluid: inducing air flow by fluid jet, e.g. ejector action
F01N 5/04
Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy: the devices using kinetic energy
F02B 37/025
Gas passages between engine outlet and pump drive, e.g. reservoirs: multiple scrolls or multiple gas passages guiding the gas to the pump drive
F02B 37/18
Control of the pumps: by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere