Exhaust mixer, emissions cleaning module and method
AssigneePerkins Engines Company Limited
InventorsAndrew Keen, Naseer A. Niaz, Swapnil Padate, Anthony Rodman, David Phillips
Life of this patent
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Abstract
An exhaust mixer provided may be used for mixing an additive, such as urea, in exhaust fluid flow. The exhaust mixer may be useful in reducing or preventing build-up of solid additive deposits by increasing efficiency of mixing of the additive. The exhaust mixer may be located at least partially within a mixing conduit and includes plurality of elongate mixing blades held in spaced configuration by a support. Each mixing blade may have a longitudinal axis extending along a longitudinal axis of the mixing conduit, wherein an injector module may be located upstream of the inlet of the mixing conduit.
Claims17
An exhaust mixer comprising:
- a plurality of elongate mixing blades comprising a plate-like body extending between a leading edge and a trailing edge,
- at least one of the plurality of elongate mixing blades including at least one flap extending at an angle to its plate-like body,
- at least one of the plurality of elongate mixing blades further including a longitudinal axis extending between the leading and trailing edges and at least two flaps extending at an angle to the plate-like body in the central section, the at least two flaps being disposed at different distances laterally from the longitudinal axis,
- the plate-like body of at least one of the plurality of elongate mixing blades including a central section and at least one wing section along a side of and disposed at an angle to the central section along an elongate vertex, said elongate vertex extending parallel to an intended flow direction of an exhaust fluid passing through the exhaust mixer in use;
- a support configured to hold the plurality of elongate mixing blades in a spaced relationship to one another;
- the support disposed in, or forming a part of, at least one of an emissions cleaning module and exhaust conduit.
A method of mixing an additive into an exhaust fluid comprising the steps of:
- passing a flow of exhaust fluid along a mixing conduit having an inlet, an outlet and a longitudinal axis;
- injecting into the flow of exhaust fluid an additive spray from an injector module;
- and
- passing the flow of exhaust fluid and additive spray through an exhaust mixer located at least partially within the mixing conduit;
- wherein the exhaust mixer comprises a plurality of elongate mixing blades arranged in a spaced arrangement for turbulently mixing the additive spray with the exhaust fluid, each of the plurality of elongate mixing blades comprising a plate-like body extending between a leading edge and a trailing edge, and a longitudinal axis extending along a plane including the longitudinal axis of the mixing conduit,
- at least one of the plurality of elongate mixing blades including at least one flap extending at an angle to its plate-like body,
- at least one of the plurality of elongate mixing blades further including a longitudinal axis extending between the leading and trailing edges and at least two flaps extending at an angle to the plate-like body in the central section, the at least two flaps being disposed at different distances laterally from the corresponding longitudinal axis,
- the plate-like body of at least one of the plurality of elongate mixing blades including a central section and at least one wing section along a side of and disposed at an angle to the central section along an elongate vertex said elongate vertex extending parallel to the flow direction of exhaust fluid passing through the exhaust mixer;
- wherein the additive spray is injected into the inlet of the mixing conduit by the injector module.
Dependencies are inferred from the claim text.