| 摘要 |
<p>A mixer (100), for integration into an exhaust conduit (14, fig.4) of an exhaust after-treatment system, comprises a body portion 101 and a plurality of blades 102 projecting from the body portion, the blades 102 being elastically deformable under the action of the pressure seen by the mixer at different flow rates in the exhaust conduit (14). The blades may deform such that flow resistance decreases as flow rate increases. The body portion 101 may comprise inner and outer cylindrical frames 151, 150 joined by radial rods 152, 153. The blades 102 may be mounted on the rods 152, 153 equally angularly spaced around the longitudinal axis and may be curved in the longitudinal and/or transverse directions. The blades may be made from stainless steel, eg AISI 441, with a thickness between 0.1-0.8mm. The mixer may be placed in the exhaust conduit upstream of the after-treatment device, eg SCR catalyst (15), and downstream of a reactant injector (26, fig.4) of urea or ammonia.</p> |
