Exhaust flow device

Patent metadata

Field	Value
Publication number	US-10086332-B2
Application number	US-201514706650-A
Country	US
Kind code	B2
Filing date	May 7, 2015
Priority date	May 7, 2015
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

Methods and systems are provided for a mixer. In one example, a system may include a mixer with three separate portions, each portion comprising a plurality of misaligned perforations.

First claim

The invention claimed is:

1. A system, comprising:
an engine exhaust gas passage; and
an exhaust gas mixer positioned in the passage having:
an upstream and a downstream section, each having a perforated annular plate angled downstream in an inward direction and a perforated upstream facing cone vertically aligned with the annular plate; and
a central section between the upstream and downstream sections having a perforated annular ring of triangular cross-section.

2. The system of claim 1 , wherein inner diameters of the annular plates of the upstream and downstream sections align longitudinally with an outer diameter of the annular ring of the central section.

3. The system of claim 1 , wherein an inner diameter of the annular ring of the central section aligns longitudinally with an outer diameter of each of the upstream facing cones of the upstream and downstream sections.

4. The system of claim 1 , wherein the perforated annular plate is coupled to the perforated upstream facing cone via one or more rods.

5. The system of claim 1 , wherein an outer diameter of each of the annular plates of the upstream and downstream sections has a cylindrical outer wall coupled thereto and in face-sharing contact with an inner surface of a pipe in which the exhaust gas mixer is fixed.

6. The system of claim 1 , wherein each section is fully separated from each other section other than coupling through a pipe in which the exhaust gas mixer is fixed.

7. The system of claim 1 , wherein space between each section in a longitudinal direction parallel to exhaust flow is free of any other mixer elements and occupied only by empty space.

8. The system of claim 1 , wherein an outer diameter of the annular ring of the central section is fully spaced away around an entire outer circumference from every point on an inner wall of a pipe in which the exhaust gas mixer is fixed, and wherein each outer diameter of each perforated annular plate of the upstream and downstream sections is contiguous with the inner wall.

9. The system of claim 1 , wherein perforations of each of the upstream and downstream sections and the central section are flow-through holes through which exhaust gas flows.

10. The system of claim 1 , wherein an upstream-most point of each of the upstream facing cones is at a central longitudinal axis of a pipe in which the exhaust gas mixer is fixed.

11. The system of claim 1 , wherein each of the upstream, central, and downstream sections is aligned with, and symmetrical about, a central longitudinal axis.

12. A system, comprising:
an engine exhaust gas passage; and
an exhaust gas mixer positioned in the engine exhaust gas passage, comprising:
three sections cascaded along an exhaust flow direction in the engine exhaust gas passage, where a first and a second outer section include respective pluralities of perforations that are axially aligned along the exhaust flow direction, and where a middle section includes a plurality of perforations that are axially misaligned from the respective pluralities of perforations of the first and second outer sections, and where the first and second outer sections are in face-sharing contact with a mixer pipe and the middle section is physically coupled to the mixer pipe via three equally spaced supports.

13. The system of claim 12 , wherein the first outer section and the second outer section include an outer annulus and a cone, and where the cone is convex and the outer annulus is concave.

14. The system of claim 13 , wherein a flow space separates the outer annulus and the cone, and wherein the flow space comprises three equally spaced legs physically coupled to the outer annulus and the cone.

15. The system of claim 12 , wherein the middle section includes an outer bevel and an inner bevel, and wherein the outer bevel and the inner bevel adjoin at an upstream portion of the middle section while deviating away from one another at a downstream portion of the middle section.

16. The system of claim 15 , wherein the inner bevel surrounds a hole of the middle section, and wherein the hole and the inner bevel are concave.

17. An engine exhaust system, comprising:
an exhaust mixer pipe with three portions;
a first portion and a third portion comprising outer and inner perforations on an outer annulus and a central cone;
the outer perforations radially misaligned with the inner perforations; and
a second portion comprising peripheral and central perforations axially misaligned with the outer and inner perforations respectively;
the peripheral and central perforations radially misaligned with one another.

18. The system of claim 1 , wherein the central section has a V-shaped cross-section with bevels coming together so that a point of the V faces upstream and an opening of the V faces downstream.

Assignees

• Ford Global Tech Llc

Inventors

• Zhang Xiaogang

Classifications

• F01N3/2066 Primary

  Selective catalytic reduction [SCR] · CPC title

• F01N3/2892

  Exhaust flow directors or the like, e.g. upstream of catalytic device · CPC title

• F01N13/007

  Apparatus used as intake or exhaust silencer · CPC title

• F01N3/2839 Primary

  Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration · CPC title

• B01D53/94 Primary

  by catalytic processes · CPC title