Exhaust element comprising a static means for mixing an additive into the exhaust gases

Abstract

The invention relates to an exhaust element including a line for exhausting the gases of a motor vehicle with a combustion engine and through the inside of which flows a fluid with the exhaust gases and of an additive to these gases. The exhaust element has, mounted inside it, a static device for mixing this additive with these exhaust gases. The static device for mixing the additive with the exhaust gases comprises at least one helicoid having an axis extending in a direction that makes a set angle with the direction of flow of the fluid through this exhaust element.

1 . Exhaust element comprising:
 a line for exhausting the gases of a motor vehicle with a combustion engine and through the inside of which flows a fluid being comprised of the exhaust gases as well as of an additive to these gases,   a static means mounted inside the exhaust element, for mixing this additive with these exhaust gases, wherein the static means for mixing the additive with the exhaust gases comprises at least one helicoid having an axis extending in a direction forming a set angle with the direction of flow of the fluid through this exhaust element.   
     
     
         2 . Exhaust element according to  claim 1 , wherein the helicoid has an increasing width, in the direction of flow of the fluid through the exhaust element. 
     
     
         3 . Exhaust element according to  claim 1 , wherein the helicoid has a decreasing width, in the direction of flow of the fluid through the exhaust element. 
     
     
         4 . Exhaust element according to  claim 1 , wherein the direction of extension of the axis of a helicoid forms, with the direction of flow of the fluid through the exhaust element, an angle between 0 and 30°. 
     
     
         5 . Exhaust element according to  claim 1 , further comprising: a mixer comprised of a plurality of helicoids, each helicoid having an axis, extending in a direction forming a set angle, in particular between 0 and 30°, with the direction of extension of the axis of another helicoid and extending in a direction forming a set angle, in particular between 0 and 30°, with the direction of flow of the fluid through this exhaust element. 
     
     
         6 . Exhaust element according to  claim 5 , wherein the helicoids are arranged so that their extension axes diverge, in the direction of flow of the fluid through the exhaust element. 
     
     
         7 . Exhaust element according to  claim 5 , wherein the helicoids are arranged so that their extension axes converge, in the direction of flow of the fluid through the exhaust element. 
     
     
         8 . Exhaust element according to  claim 5 , wherein the axes of helicoids are arranged according to a matrix, in particular a regular one, with respect to the geometry of the section of the exhaust element. 
     
     
         9 . Exhaust element according to  claim 5 , wherein two immediately juxtaposed helicoids have the same direction of rotation. 
     
     
         10 . Exhaust element according to  claim 5 , wherein two immediately juxtaposed helicoids have an opposite direction of rotation. 
     
     
         11 . Exhaust element according to  claim 5 , wherein the mixer comprises a plurality of helicoids and wherein these helicoids are grouped together inside at least one set comprising at least two helicoids having preferably the same direction of rotation. 
     
     
         12 . Exhaust element according to  claim 5 , wherein the mixer comprises at least one module comprising a plate oriented parallel to the direction of flow of the fluid through the exhaust element and at least one or a set of at least two helicoids extending in the extension downstream of said plate. 
     
     
         13 . Exhaust element according to  claim 12 , wherein the mixer comprises a plurality of modules, each module comprising a plate as well as a set of at least two helicoids and assembled, two by two, in particular perpendicularly, through assembling means at least one plate of at least one such module includes. 
     
     
         14 . Exhaust element according to  claim 13 , wherein a module comprises, at the level of at least one of the lateral edges of a plate of said module, a wing located in the extension of said plate and oriented in the direction of another wing the plate of another module comprises, wherein said wing is made integral with, in particular by welding. 
     
     
         15 . Exhaust element according to  claim 12 , wherein the module comprises a single part, in particular a metallic part, preferably made by cutting out, boring, in particular complemented by folding. 
     
     
         16 . Exhaust element according to  claim 5 , wherein the exhaust element comprises a means for receiving the mixer. 
     
     
         17 . Exhaust element according to  claim 1 , wherein the exhaust element comprises either of an exhaust conduit comprising, inside, the means for mixing an additive with the exhaust gases, or of a device for the physical and/or chemical treatment of exhaust gases comprising, inside, the means for mixing an additive with the exhaust gases as well as, downstream of this mixer, a means for the physical and/or chemical treatment of this mixture.