Flow mixing device for an exhaust after-treatment system

Abstract

A flow mixing device includes a body having a first end, a second end, and an interior volume defined between them. An inlet plate, coupled to the first end of the body, defines at least two inlet orifices in fluid communication with the interior volume. Similarly, an outlet plate, coupled to the second end defines an outlet passage of the flow mixing device. A diffuser conduit, coupled to the inlet plate, defines an inlet passage disposed in fluid communication with the respective inlet orifices. A separator plate assembly disposed in the interior volume extends partially between the first and second ends of the body. Flow guiding vanes, coupled proximal to the second end, extend partially within the diffuser conduit.

What is claimed is: 
     
         1 . A flow mixing device for an exhaust after-treatment system of an internal combustion engine, the flow mixing device comprising:
 a body having a first end and a second end disposed distally away from one another, the body configured to define an interior volume therein;   an inlet plate coupled to the first end of the body, the inlet plate having at least two inlet orifices formed therein in fluid communication with the interior volume;   an outlet plate coupled to the second end of the body, the outlet plate defining an outlet passage in fluid communication with the interior volume;   a diffuser conduit releasably coupled to the inlet plate and disposed around each of the inlet orifices, the diffuser conduits configured to define an inlet passage disposed in fluid communication with the inlet orifices of the inlet plate and the interior volume of the body;   a separator plate assembly comprising a first separator plate and a second separator plate, the first and second separator plates coupled at an angle relative to each other at the first end of the body and converging towards a longitudinal plane defined between the pair of diffuser conduits; and   a plurality of flow guiding vanes coupled to the body proximal to the second end and configured to extend at least partially within the diffuser conduits.   
     
     
         2 . The flow mixing device of  claim 1  further including a perforated plate coupled to the outlet plate of the body, the perforated plate configured to allow a substantially uniform flow profile of a fluid exiting the body.