초록 ▼

An exhaust treatment arrangement includes a mixing assembly disposed between first and second substrates; and an injection mounting location disposed at the mixing assembly. The mixing assembly includes a mixing arrangement configured to direct exhaust flow exiting the first substrate in a swirling

An exhaust treatment arrangement includes a mixing assembly disposed between first and second substrates; and an injection mounting location disposed at the mixing assembly. The mixing assembly includes a mixing arrangement configured to direct exhaust flow exiting the first substrate in a swirling configuration, a restricting member defining a restricted passage, and optionally a dispersing member configured to even out the exhaust flow.

대표청구항 ▼

1. A mixing assembly having an upstream end and a downstream end, the mixing assembly having a central longitudinal axis extending between the upstream end and the downstream end, the mixing assembly comprising: a mixing arrangement including a deflection body, a mesh holder, and a mesh, the deflect

1. A mixing assembly having an upstream end and a downstream end, the mixing assembly having a central longitudinal axis extending between the upstream end and the downstream end, the mixing assembly comprising: a mixing arrangement including a deflection body, a mesh holder, and a mesh, the deflection body extending across a full cross-dimension of the mixing assembly to divide the mixing assembly into a first region upstream of the deflection body and a second region downstream of the deflection body, the mesh holder defining a passage through the deflection body between the first and second regions, the passage not being parallel with the central longitudinal axis of the mixing assembly, the mesh being disposed in the passage, the mesh holder having a first set of perforations leading to the passage at a location upstream of the mesh; anda restricting member disposed downstream of the mixing arrangement, the restricting member including a baffle extending across the cross-dimension of the mixing assembly, the baffle defining a restricted passage. 2. The mixing assembly of claim 1, wherein the passage defined by the mesh holder extends perpendicular to the central longitudinal axis of the mixing assembly. 3. The mixing assembly of claim 2, wherein the passage defined by the mesh holder is offset from the central longitudinal axis of the mixing assembly so that exhaust leaving the mesh holder enters the second region of the mixing assembly tangentially. 4. The mixing assembly of claim 1, wherein the mesh has an upstream face that is parallel to the central longitudinal axis of the mixing assembly. 5. The mixing assembly of claim 1, wherein an upstream face of the mesh is angled relative to the central longitudinal axis of the mixing assembly by about 25° to about 30°. 6. The mixing assembly of claim 1, further comprising a doser mount located at a first axial end of the mesh holder so that a doser mounted at the doser mount would spray into the passage towards the mesh. 7. The mixing assembly of claim 1, wherein the deflection body defines a plate extending across the mixing assembly at a non-zero, non-orthogonal angle relative to the central longitudinal axis. 8. The mixing assembly of claim 1, further comprising: an annular wall extending between upstream and downstream ends of the mixing assembly, the annular wall defining the cross-dimension of the mixing assembly; anda deflector arrangement disposed between the passage of the mesh holder and the annular wall, the deflector arrangement being aligned with the passage to inhibit reactant carried by exhaust flowing through the mesh holder from contacting the annular wall, the deflector arrangement being thermally buffered from the annular wall. 9. The mixing assembly of claim 8, wherein the deflector arrangement is monolithically formed with the deflection body. 10. The mixing assembly of claim 1, wherein the deflection body is shaped so that exhaust can flow fully around a circumference of the mesh holder. 11. The mixing assembly of claim 1, wherein the first set of perforations extend fully around a circumference of the mesh holder so that the first set of perforations includes perforations facing downstream and perforations facing upstream, wherein the perforations facing downstream are sized and shaped to allow a greater volume of exhaust to pass therethrough compared to the perforations facing upstream. 12. The mixing assembly of claim 1, wherein the mesh divides the passage of the mesh holder into an upstream passage and a downstream passage, the first set of perforations leading to the upstream passage, the mesh holder also defining a second set of perforations leading to the downstream passage, thereby providing a bypass around the mesh. 13. The mixing assembly of claim 12, wherein the bypass is a first bypass, and wherein the deflection body defines a second bypass downstream of the mesh holder and upstream of the restricting member, the second bypass including at least one aperture defined in the deflection body to enable exhaust to enter the second region of the mixing assembly tangentially without passing through the mesh holder. 14. The mixing assembly of claim 12, wherein the second set of perforations defined by the mesh holder are located at a common side of the mesh holder to enhance swirling of the exhaust leaving the downstream passage of the mesh holder. 15. An exhaust treatment arrangement disposed along a conduit, the exhaust treatment arrangement comprising: a mixing arrangement including a deflection body, a mesh holder, and a mesh, the deflection body extending across a full cross-dimension of the conduit to divide the conduit into a first region upstream of the deflection body and a second region downstream of the deflection body, the mesh holder defining a passage through the deflection body between the first and second regions, the passage not being parallel with a central longitudinal axis of the mixing arrangement, the mesh being disposed in the passage, the mesh holder having a first set of perforations leading to the passage at a location upstream of the mesh, the mesh having an upstream face that is either parallel to the central longitudinal axis of the mixing arrangement or angled relative to the central longitudinal axis of the mixing arrangement by about 25° to about 30°; anda downstream exhaust treatment substrate disposed downstream of the mixing arrangement. 16. The exhaust treatment arrangement of claim 15, further comprising an upstream exhaust treatment substrate disposed upstream of the mixing arrangement. 17. The exhaust treatment arrangement of claim 16, wherein the upstream exhaust treatment substrate and the downstream exhaust treatment substrate are coaxially aligned with the mixing arrangement. 18. The exhaust treatment arrangement of claim 15, further comprising a restricting member disposed downstream of the mixing arrangement and upstream of the downstream exhaust treatment substrate. 19. The exhaust treatment arrangement of claim 18, further comprising a dispersing member disposed downstream of the restricting member. 20. The exhaust treatment arrangement of claim 15, further comprising: at least one deflector disposed in the second region of the conduit, the deflector not being aligned with the passage of the mesh holder, the deflector extending radially inwardly from an outer circumference of the second region. 21. The mixing assembly of claim 1, wherein the mesh holder has a cylindrical shape.