Compressor stage egr injection

Patent metadata

Field	Value
Publication number	US-2019107082-A1
Application number	US-201816158583-A
Country	US
Kind code	A1
Filing date	Oct 12, 2018
Priority date	Jun 30, 2016
Publication date	Apr 11, 2019
Grant date	—

Abstract

A product may include a bearing housing in which a shaft may be supported by a bearing so that it may rotate. A compressor wheel may be disposed on the shaft. A compressor cover may be connected with the bearing housing, which may form a compressor body and may define a chamber within which the compressor wheel may rotate. A diffuser may extend radially outward from the chamber and may receive gas from the compressor wheel. An inlet may be provided to the compressor body, which may receive a supply of exhaust gas. An EGR distribution cavity may be defined within the compressor body and may extend around the shaft. An EGR inlet channel may extend into the bearing housing from the inlet to the EGR distribution cavity. An EGR passage may extend from the EGR distribution cavity to the diffuser.

First claim

What is claimed is:

1 . A product comprising a bearing housing in which a shaft is supported by a bearing to rotate, a compressor wheel disposed on the shaft, a compressor cover connected with the bearing housing creating a compressor body defining a chamber within which the compressor wheel rotates, a diffuser extending radially outward from the chamber and receiving gas from the compressor wheel, an inlet on the compressor body receiving a supply of exhaust gas, an EGR distribution cavity defined completely within the compressor body and extending around the shaft, an EGR inlet channel extending into the bearing housing from the inlet to the EGR distribution cavity, and an EGR passage extending from the EGR distribution cavity to the diffuser.

2 . The product according to claim 1 wherein the shaft rotates on an axis and the EGR inlet channel extends in a direction toward the axis.

3 . The product according to claim 1 wherein the EGR distribution cavity extends in a circle around the shaft and at any point along the circle has a consistent cross section.

4 . The product according to claim 1 wherein the compressor wheel includes a compressor wheel tip at its radially outermost perimeter, and wherein the bearing housing includes a diffuser face defining a side of the diffuser that extends in a radial direction toward the shaft and is directed at the compressor wheel tip.

5 . The product according to claim 1 wherein the compressor wheel and bearing housing define a pocket between them that extends in a radial direction inward from a radially outermost tip of the compressor wheel, the EGR passage opening directly into the pocket.

6 . The product according to claim 1 wherein the shaft rotates on an axis and the EGR inlet channel extends to be directed toward the axis at an oblique angle.

7 . The product according to claim 1 comprising an engine, an exhaust passage carrying exhaust away from the engine, and an EGR passage connecting the exhaust passage with the EGR inlet channel.

8 . A method of operating the product of claim 7 comprising providing an exhaust throttle valve in the exhaust passage, and delivering exhaust gas to the EGR inlet channel without throttling the exhaust throttle valve.

9 . The method according to claim 8 comprising providing a pocket between the compressor wheel and the bearing housing that extends in a radial direction inward from a radially outermost tip of the compressor wheel, and directing at least of part of the EGR passage to supply exhaust gas directly into the pocket.

10 . A product comprising a bearing housing in which a shaft is supported by a bearing to rotate, a compressor wheel disposed on the shaft, a compressor cover connected with the bearing housing forming a compressor body that defines a chamber within which the compressor wheel rotates and defining an air inlet through which air is directed into the chamber, a diffuser extending radially outward from the chamber and receiving gas from the compressor wheel, an EGR inlet in the compressor body receiving a supply of exhaust gas, an EGR distribution cavity defined in the compressor body and extending around the shaft, an EGR inlet channel extending into the compressor body from the EGR inlet to the EGR distribution cavity, and an EGR passage extending from the EGR distribution cavity to the diffuser.

11 . The product according to claim 10 wherein the EGR distribution cavity extends in a circle around the shaft and at any point along the circle has a consistent cross section.

12 . The product according to claim 10 wherein the compressor wheel includes a compressor wheel tip at its radially outermost perimeter, and wherein the bearing housing includes a diffuser face defining a side of the diffuser that extends in a radial direction toward the shaft and is directed at the compressor wheel tip.

13 . The product according to claim 10 wherein the compressor wheel and bearing housing define a pocket between them that extends in a radial direction inward from a radially outermost tip of the compressor wheel, the EGR passage opening directly into the pocket.

14 . The product according to claim 10 wherein the shaft rotates on an axis and the EGR inlet channel points toward the axis.

15 . The product according to claim 10 wherein the EGR distribution cavity is annular in shape and has a rectangular cross section.

16 . A compressor for use with an engine, wherein the engine includes an exhaust passage operatively arranged to carry exhaust gas away from the engine and an intake passage operatively arranged to provide air to the engine, the compressor comprising:
a bearing housing in which a shaft is supported by a bearing to rotate about an axis; a compressor wheel disposed on the shaft; a compressor cover connected to the bearing housing and defining a chamber within which the compressor wheel rotates about the axis, the compressor cover comprising:
a first inlet arranged to deliver air to the compressor wheel; and
a diffuser extending radially outward from the chamber and receiving at least a portion of the air from the compressor wheel; and
an EGR junction, comprising:
a second inlet arranged to receive at least a portion of the exhaust gas from the engine;
an EGR distribution cavity extending around the shaft;
an EGR inlet channel extending from the second inlet to the EGR distribution cavity; and
an EGR passage extending from the EGR distribution cavity to the diffuser and arranged to deliver at least a portion of the exhaust gas to the diffuser.

17 . The compressor of claim 1 , wherein the EGR junction is disposed in the compressor cover.

18 . The compressor of claim 1 , wherein the EGR junction is disposed in the bearing housing.

19 . The compressor of claim 1 , further comprising a backplate disposed between the compressor cover and the bearing housing, wherein the backplate forms a portion of the diffuser, and wherein the EGR junction is disposed in the backplate.

20 . The compressor of claim 1 wherein the bearing housing includes a separate backplate disposed adjacent the compressor cover and wherein the backplate forms part of the diffuser.

Assignees

• Borgwarner Inc

Inventors

• Mchenry Joseph Powell
• Jenks Gordon Clark
• Wallace Robert Malcolm

Classifications

• F05D2220/40

  in turbochargers · CPC title

• F04D17/10

  for compressing or evacuating · CPC title

• F02B37/005

  Exhaust driven pumps being combined with an exhaust driven auxiliary apparatus, e.g. a ventilator · CPC title

• F02B33/40

  of non-positive-displacement type · CPC title

• F04D29/053

  Shafts · CPC title