Mixing device in an exhaust gas pipe
AssigneeRenault Trucks
InventorsMichel Vanvolsem, Julien Ampere
Life of this patent
Estimating the term…
Abstract
In an exhaust gas pipe, a first fluid flows in a flow direction in the pipe, and a second fluid is injected inside the pipe by a nozzle, from an injection inlet arranged in the pipe wall, according to an injection direction. A mixing device fastened inside the pipe upstream from the injection inlet creates turbulence that helps the mixing of the fluids. The mixing device has a first portion located on the injection inlet side of the pipe and a second portion located opposite the injection inlet side of the pipe, the portions being designed so that the fluid velocity is higher downstream from the mixing device second portion than downstream from the mixing device first portion. An aqueous solution of urea can be injected inside an exhaust pipe of a diesel engine.
Claims7
A mixing system comprising:
- a pipe in which a first fluid can flow in a flow direction;
- a nozzle designed to inject a second fluid inside the pipe from an injection inlet arranged in the pipe wall, according to an injection direction;
- and
- a mixing device positioned inside the pipe upstream from the injection inlet, the mixing device having, at least, a first portion proximal to the injection inlet and a second portion distal to the injection inlet, wherein the mixing device comprises a central axis identical to a pipe axis and blades extending radially from the central axis, the spacing between successive blades being greater in the second portion compared with the first portion.
Dependencies are inferred from the claim text.