Exhaust aftertreatment assembly with a mixer having a mixing plate that is crescent shaped

Patent metadata

Field	Value
Publication number	US-2025135414-A1
Application number	US-202418909471-A
Country	US
Kind code	A1
Filing date	Oct 8, 2024
Priority date	Oct 26, 2023
Publication date	May 1, 2025
Grant date	—

Abstract

An exhaust aftertreatment assembly includes a tubular conduit and a mixer. The tubular conduit has a central axis. The mixer is disposed in the tubular conduit. The mixer includes a first mixing plate and a second mixing plate. The first mixing plate is crescent shaped. The first mixing plate includes a first plate convex edge and a first plate concave edge. The first plate convex edge is attached to the tubular conduit. The first plate concave edge intersects the first plate convex edge at a first plate first point and a first plate second point. The second mixing plate is crescent shaped. The second mixing plate includes a second plate convex edge and a second plate concave edge. The second plate convex edge is attached to the tubular conduit. The second plate concave edge intersects the second plate convex edge.

First claim

What is claimed is:

1 . An exhaust aftertreatment assembly comprising:
a tubular conduit having a central axis; and a mixer disposed in the tubular conduit and comprising:
a first mixing plate, the first mixing plate being crescent shaped, the first mixing plate comprising:
a first plate convex edge attached to the tubular conduit, and
a first plate concave edge that intersects the first plate convex edge at a first plate first point and a first plate second point; and

a second mixing plate, the second mixing plate being crescent shaped, the second mixing plate comprising:
a second plate convex edge attached to the tubular conduit, and
a second plate concave edge that intersects the second plate convex edge at a second plate first point and a second plate second point;

wherein:
a plane in which the first mixing plate extends and a plane in which the second mixing plate extends are oblique to the central axis of the tubular conduit; and
the plane in which the first mixing plate extends intersects the plane in which the second mixing plate extends inside of the tubular conduit.

2 . The exhaust aftertreatment assembly of claim 1 , wherein:
the first mixing plate is flat; and the second mixing plate is flat.

3 . The exhaust aftertreatment assembly of claim 1 , wherein the first mixing plate and the second mixing plate are positioned relative to the tubular conduit such that the central axis extends between the first plate concave edge and the second plate concave edge.

4 . The exhaust aftertreatment assembly of claim 1 , wherein the plane in which the first mixing plate extends intersects the second mixing plate between the second plate first point and the second plate second point of the second plate convex edge.

5 . The exhaust aftertreatment assembly of claim 1 , wherein the first plate concave edge comprises:
a plurality slots; and a plurality of tabs, each of the tabs positioned between two of the slots, each of the tabs extending away from a body of the first mixing plate.

6 . The exhaust aftertreatment assembly of claim 5 , wherein the one or more of the tabs extend over a side of the body of the first mixing plate, and one or more of the tabs extend parallel to the side of the body.

7 . The exhaust aftertreatment assembly of claim 1 , wherein the mixer further comprises:
a third mixing plate comprising:
a third mixing plate convex edge positioned clockwise about the central axis of the tubular conduit, a midpoint of the third mixing plate convex edge positioned 90 degrees clockwise relative to a midpoint of the first plate convex edge of the first mixing plate.

8 . The exhaust aftertreatment assembly of claim 1 , wherein the mixer further comprises:
a third mixing plate positioned 90 degrees clockwise around the central axis of the tubular conduit relative to the first mixing plate or the second mixing plate.

9 . The exhaust aftertreatment assembly of claim 1 , wherein the mixer further comprises:
a third mixing plate positioned 90 degrees clockwise around the central axis of the tubular conduit relative to the first mixing plate; and a fourth mixing plate positioned 90 degrees clockwise around the central axis of the tubular conduit relative to the second mixing plate.

10 . The exhaust aftertreatment assembly of claim 1 , wherein the first mixing plate and the second mixing plate include a bent portion between a first end portion and a second end portion.

11 . The exhaust aftertreatment assembly of claim 1 , wherein the first mixing plate is bent a first angular amount about a first axis and a second angular amount about a second axis, the first angular amount greater than the second angular amount.

12 . The exhaust aftertreatment assembly of claim 1 , wherein the mixer further comprises:
a third mixing plate; a fourth mixing plate; a fifth mixing plate positioned between the first mixing plate and the second mixing plate; and a sixth mixing plate positioned between the third mixing plate and the fourth mixing plate.

13 . The exhaust aftertreatment assembly of claim 1 , wherein the mixer further comprises:
a third mixing plate separated from the first mixing plate by 120 degrees about the central axis and separated from the second mixing plate by 120 degrees about the central axis.

14 . The exhaust aftertreatment assembly of claim 1 , wherein the first mixing plate and the second mixing plate intersect.

15 . The exhaust aftertreatment assembly of claim 1 , wherein the first mixing plate and the second mixing plate are rotated at angles about the central axis such that the mixer is asymmetric when viewed from an upstream or downstream end.

16 . The exhaust aftertreatment assembly of claim 1 , wherein the first mixing plate includes one or more of (a) a plurality of notches along the first plate concave edge (b) a plurality of actuate grooves extending around the first plate concave edge (c) a plurality of cut-outs, each of the cut-outs along the first plate convex edge, or (d) a plurality of protrusions along the first plate concave edge.

17 . An exhaust aftertreatment assembly comprising:
a tubular conduit having a central axis; and a mixer disposed in the tubular conduit and comprising:
a first mixing plate, the first mixing plate being crescent shaped, the first mixing plate comprising:
a first plate convex edge attached to the tubular conduit, and
a first plate concave edge; and

a second mixing plate, the second mixing plate being crescent shaped, the second mixing plate comprising:
a second plate convex edge attached to the tubular conduit, and
a second plate concave edge;

wherein:
the first mixing plate and the second mixing plate are positioned relative to the tubular conduit such that the central axis extends between the first plate concave edge and the second plate concave edge; and
a plane in which the first mixing plate extends and a plane in which the second mixing plate extends are oblique to the central axis of the tubular conduit.

18 . The exhaust aftertreatment assembly of claim 17 , wherein the first mixing plate is truncated and further comprises:
a first connecting edge extending between the first plate convex edge and the second plate convex edge; and a second connecting edge extending between the first plate convex edge and the second plate convex edge, the second connecting edge opposite the first connecting edge.

19 . An exhaust aftertreatment assembly comprising:
a tubular conduit having a central axis; and a mixer disposed in the tubular conduit and comprising:
a first mixing plate comprising:
a first plate convex edge attached to the tubular conduit, and
a first plate concave edge opposite the first plate convex edge; and

a second mixing plate comprising:
a second plate convex edge attached to the tubular conduit, and
a second plate concave edge opposite the second plate convex edge;

wherein:
the first mixing plate and the second mixing plate are positioned relative to the tubular conduit such that the central axis extends between the first plate concave edge and the second plate concave edge; and
a plane in which the first mixing plate extends intersects a plane in which the second mixing plate extends inside of the tubular conduit.

20 . The exhaust aftertreatment assembly of claim 19 , wherein the first plate concave edge and the first plate convex edge coincide with the plane in which the first mixing plate extends and the second plate convex edge and th

Assignees

• Cummins Emission Solutions Inc

Inventors

• Willey Donald Edward
• Petersen Ryan Aaron

Classifications

• B01F25/431971

  Mounted on the wall · CPC title

• B01F25/431

  Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor · CPC title

• B01F25/43151

  composed of consecutive sections of deformed flat pieces of material · CPC title

• B01F25/43161

  composed of consecutive sections of flat pieces of material · CPC title

• B01F25/4316 Primary

  the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod · CPC title