Exhaust system

Abstract

In order to provide an exhaust system for a combustion engine with an outer casing in which hot exhaust gas is introduced through an exhaust inlet and discharged from an exhaust outlet wherein the exhaust outlet is of a tubular, more preferably having a circular or oval cross section design which, in a simple way, preferably effectively lowers the exhaust gas temperature in the exhaust outlet it is proposed that arranged in the area of the tubular exhaust outlet is an exhaust swirling device having at least one guide blade through which the exhaust gas is deflected in the exhaust outlet.

1 . An exhaust system ( 100 ) for a combustion engine with an outer casing ( 10 ), directed into which is hot exhaust gas ( 31 ) through an exhaust inlet and discharged from an exhaust outlet ( 12 ) while the exhaust outlet ( 12 ) is constructed in tube form, especially with a circular or oval cross section, characterised in that in the area of the tubular exhaust outlet ( 12 ) an exhaust swirling device ( 20 ) having at least one guide blade ( 23 ) is arranged by means of which the exhaust gas ( 31 ) is deflected in the exhaust outlet ( 12 ). 
   
   
       2 . The exhaust system according to  claim 1 , characterised in that the exhaust swirling device ( 20 ) is provided as an independent component in the area of the exhaust outlet ( 12 ). 
   
   
       3 . The exhaust system according to  claim 1  characterised in that the exhaust swirling device ( 20 ) is arranged in a separate casing ( 21 ) more preferably in a casing ( 21 ) with a sectional circular or oval cross section, where the casing ( 21 ) more preferably serves for the attachment of the exhaust swirling device ( 20 ) in the area of the tubular exhaust outlet ( 12 ). 
   
   
       4 . The exhaust system according to  claim 1  characterised in that the exhaust swirling device ( 20 ) is arranged in the exhaust outlet ( 12 ) such that a short pipe section, especially of the exhaust outlet ( 12 ), additionally joins the exhaust swirling device ( 20 ) before the exhaust gas ( 31 ) leaves the casing ( 10 ). 
   
   
       5 . The exhaust system according to  claim 1  in that the exhaust swirling device ( 20 ) has a sheet metal design wherein more preferably a part or the entire exhaust swirling device ( 20 ) can be formed from the outer casing ( 10 ). 
   
   
       6 . The exhaust system according to  claim 1  characterised in that the exhaust swirling device ( 20 ) has a casting more preferably a precision casting. 
   
   
       7 . The exhaust system according to  claim 1  characterised in that the entire exhaust gas ( 31 ) can be deflected by means of the guide blade(s) ( 23 ) as a result of which swirling of the entire exhaust gas ( 31 ) with the ambient air takes place. 
   
   
       8 . The exhaust system according to  claim 7 , characterised in that a fixed element is provided in the central cross sectional area of the exhaust swirling device ( 20 ) to which the guide blade(s) ( 23 ) can also be attached. 
   
   
       9 . The exhaust system according to  claim 1  characterised in that only a part of the exhaust gas ( 31 ) can be deflected centrally by means of the guide blade(s) ( 23 ) while an outer part of the exhaust gas ( 31 ) can be influenced by the guide blade(s) ( 23 ) while an inner part in the central cross sectional area passes through the exhaust swirling device ( 20 ) without being influenced. 
   
   
       10 . The exhaust system according to  claim 9  characterised in that the central cross sectional area of the exhaust swirling device ( 20 ) is designed open. 
   
   
       11 . The exhaust system according to  claim 1  characterised in that a triangular opening ( 26 ) through which a part of the exhaust gas ( 31 ) is directed is provided for each guide blade ( 23 ). 
   
   
       12 . The exhaust system according to  claim 11  characterised in that the exhaust gas ( 31 ) passes the guide blade(s) ( 23 ) first in flow direction and is subsequently directed through the triangular openings ( 26 ). 
   
   
       13 . The exhaust system according to  claim 1  characterised in that a guide blade ( 23 ) has a circular segment type surface more preferably constructed flat. 
   
   
       14 . The exhaust system according to  claim 1  characterised in that a guide blade ( 23 ) is developed arch-shaped or wave-type. 
   
   
       15 . The exhaust system according to  claim 1  characterised in that the approximate width ( 28 ) of a guide blade ( 23 ) corresponds to a radius of the exhaust swirling device ( 20 ). 
   
   
       16 . The exhaust system according to  claim 1  characterised in that all guide blades ( 23 ) are constructed symmetrically identical. 
   
   
       17 . The exhaust system according to  claim 1  characterised in that the exhaust swirling device ( 20 ) discharges the exhaust gas ( 31 ) largely tangentially to the longitudinal axis ( 27 ) of the exhaust swirling device ( 20 ). 
   
   
       18 . The exhaust system according to  claim 1  characterised in that the exhaust swirling device ( 20 ) discharges the exhaust gas ( 31 ) largely radially to the longitudinal axis ( 27 ) of the exhaust swirling device ( 20 ). 
   
   
       19 . The exhaust system according to  claim 1  characterised in that the hot exhaust gas ( 31 ) is discharged from the exhaust outlet ( 12 ) following treatment of the exhaust gas ( 31 ). 
   
   
       20 . The exhaust system according to  claim 1  characterised in that at least one catalyst element for exhaust gas treatment is arranged in the exhaust system. 
   
   
       21 . The exhaust system according to  claim 20  characterised in that the catalyst element is arranged in a catalyst chamber ( 13 ) and the exhaust gases ( 31 ) are directed from the catalyst chamber ( 13 ) through an exhaust duct ( 15 ) to the exhaust swirling device ( 20 ) before the exhaust gas ( 31 ) enters the environment through the exhaust outlet ( 12 ). 
   
   
       22 . The exhaust system according to  claim 1  characterised in that at least one spark protection screen is arranged before or in the exhaust swirling device ( 20 ). 
   
   
       23 . The exhaust system according to  claim 1  characterised in that an axial depression of the guide blades ( 23 ) comprises 5 to 70% advantageously 10 to 50% and particularly advantageously 15 to 30% of the diameter of the exhaust duct ( 12 ). 
   
   
       24 . The exhaust system according to  claim 1  characterised in that the area of all openings ( 26 ) for a part flow of the exhaust gas ( 31 ) is at least as large as the cross sectional area of the exhaust outlet ( 1   2 ). 
   
   
       25 . (canceled)