Flowhood and emissions cleaning module

Patent metadata

Field	Value
Publication number	US-9816422-B2
Application number	US-201414783362-A
Country	US
Kind code	B2
Filing date	Apr 11, 2014
Priority date	Apr 11, 2013
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A flowhood is provided to which an upstream conduit and a downstream conduit of an emissions cleaning module can be connected includes a first section and a second section. The second section includes a first aperture for connection to the upstream conduit and a second aperture for connection to the downstream conduit. The first and second apertures may face substantially in the same direction to permit a compact arrangement. A body of the first section may be shaped to channel gas flow from the first aperture to the second aperture. An emissions cleaning module including such a flowhood is also described.

First claim

The invention claimed is:

1. A flowhood for an emissions cleaning module having an upstream conduit and a downstream conduit, the flowhood comprising:
a first section;
a second section coupled to the first section, the first section and the second section defining an internal volume of the flowhood,
the second section defining a first aperture and a second aperture therethrough, the first aperture being configured for fluid connection to the upstream conduit, the second aperture being configured for fluid connection to the downstream conduit;
an elongate body conduit disposed at least partly within the internal volume of the flowhood and projecting through the second aperture, the elongate body conduit being configured to effect fluid communication between the internal volume of the flowhood and the downstream conduit; and
at least one deflector disposed within the internal volume of the flowhood and located at least partly between the first aperture and the second aperture along a first direction that extends from the first aperture toward the second aperture, the at least one deflector extending at least partly between the first aperture and the second aperture along a second direction that is transverse to the first direction,
the at least one deflector being concentrically arranged with the elongate body conduit and being spaced apart from the elongate body conduit, such that the at least one deflector and the elongate body conduit define a circulation flow path therebetween, the circulation flow path being configured to effect a circulation fluid flow about a perimeter the elongate body conduit.

2. The flowhood as claimed in claim 1 , wherein the first aperture and the second aperture each face the second direction.

3. The flowhood as claimed in claim 1 , wherein the first section of the flowhood comprises a rear wall and a sidewall defining an open mouth of the first section, and
the second section comprises a body that closes the open mouth of the first section other than at the first aperture and the second aperture.

4. The flowhood as claimed in claim 3 , wherein the flowhood is tapered by shaping and/or angling of the sidewall.

5. The flowhood as claimed in claim 1 , wherein the second aperture is located at a downstream end of the flowhood and the first aperture is located at an upstream end of the flowhood.

6. The flowhood as claimed in claim 5 , wherein the flowhood is tapered along the first direction such that a dimension of the upstream end is larger than a dimension of the downstream end.

7. The flowhood as claimed in claim 1 , wherein the at least one deflector comprises at least one curved element having a concave surface, the concave surface facing the elongate body conduit and at least partly defining the circulation flow path.

8. The flowhood as claimed in claim 1 , wherein the at least one deflector comprises a generally V-shaped configuration having a first element and a second element joined at an apex, the apex being disposed between the first aperture and the second aperture along the first direction.

9. The flowhood as claimed in claim 1 , wherein a rear wall of the first section defines a third aperture that is configured for mounting of an injector module.

10. The flowhood as claimed in claim 9 , wherein the third aperture faces the second direction, and the third aperture at least partially overlaps with the second aperture along the first direction.

11. The flowhood as claimed in claim 1 , wherein the first section of the flowhood includes a first sidewall and a second sidewall, the first sidewall facing the second sidewall along the second direction,
the at least one deflector includes a first deflector and a second deflector,
the first deflector extends away from the first sidewall at least partly along the second direction,
the second deflector extends away from the second sidewall at least partly along the second direction,
the first deflector overlaps with the second deflector along the second direction, and
the second deflector is disposed between the first deflector and the first aperture along the first direction.

12. An emissions cleaning module comprising an upstream conduit, a downstream conduit and a flowhood, the flowhood comprising:
a first section;
a second section coupled to the first section, the first section and the second section defining an internal volume of the flowhood,
the second section defining a first aperture and a second aperture therethrough, the first aperture being fluidly connected to the upstream conduit, the second aperture being fluidly connected to the downstream conduit;
an elongate body conduit disposed at least partly within the internal volume of the flowhood and projecting through the second aperture, the elongate body conduit effecting fluid communication between the internal volume of the flowhood and the downstream conduit; and
at least one deflector disposed within the internal volume of the flowhood and located at least partly between the first aperture and the second aperture along a first direction that extends from the first aperture toward the second aperture, the at least one deflector extending at least partly between the first aperture and the second aperture along a second direction that is transverse to the first direction,
the at least one deflector being concentrically arranged with the elongate body conduit and being spaced apart from the elongate body conduit, such that the at least one deflector and the elongate body conduit define a circulation flow path therebetween, the circulation flow path being configured to effect a circulation fluid flow about a perimeter the elongate body conduit.

13. The emissions cleaning module as claimed in claim 12 , further comprising a mixer that includes the elongate body conduit.

14. The emissions cleaning module as claimed in claim 13 , wherein the mixer spans a junction between the flowhood and the downstream conduit.

15. The emissions cleaning module as claimed in claim 13 , wherein an upstream end of the mixer is mounted to the flowhood and disposed within the internal volume of the flowhood, and
a wall of the elongate body conduit defines a plurality of apertures therethrough, an internal volume of the elongate body conduit being in fluid communication with the internal volume of the flowhood via the plurality of apertures through the wall of the elongate body conduit.

16. The emissions cleaning module as claimed in claim 12 , wherein the flowhood is formed from at least one component that is separate from the upstream conduit and the downstream conduit which are connected between the upstream conduit and the downstream conduit.

17. The emissions cleaning module as claimed claim 12 , wherein the at least one deflector includes a first deflector and a second deflector.

18. The emissions cleaning module as claimed in claim 17 , wherein the first section of the flowhood includes a first sidewall and a second sidewall, the first sidewall facing the second sidewall along the second direction,
the first deflector extends away from the first sidewall at least partly along the second direction,
the second deflector extends away from the second sidewall at least partly along the second direction,
the first deflector overlaps with the second deflector along the second direction, and
the second deflector is disposed between the first deflector and the first aperture along the first direction.

19. The emissions cleaning module as claimed in claim 12 , wherein the at least one deflector comprise

Assignees

• Perkins Engines Co Ltd

Inventors

• Freeman Susannah
• Zimmermann Anton
• Keen Andrew
• Heaton David
• Petto Christopher

Classifications

• F01N2470/08

  Exhaust gas passages being formed between the walls of an outer shell and an inner chamber · CPC title

• F01N3/2066

  Selective catalytic reduction [SCR] · CPC title

• F01N13/1888

  the housing of the assembly consisting of two or more parts, e.g. two half-shells · CPC title

• F01N13/0097

  the purifying devices are arranged in a single housing · CPC title

• F01N3/2892 Primary

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