Exhaust silencer

Abstract

In order to provide an exhaust muffler ( 100 ) for an internal combustion engine ( 11 ), especially a portable implement, comprising a catalyst ( 10 ) which is arranged in a housing ( 12 ) which has at least one inlet opening ( 13 ) and one outlet opening ( 14 ) for exhaust gas flowing out from the internal combustion engine ( 11 ) into the environment ( 15 ), in which the temperature of the exhaust gas in the area of the outlet into the environment is reduced substantially and/or a sufficiently long path length is made available so that flame development can be avoided especially in the outlet area of the exhaust muffler, it is proposed that the outlet opening ( 14 ) has at least one means ( 16 ) through which exhaust gas flows, which is arranged partially outside the housing ( 12 ) and has an outlet ( 18 ) facing the environment ( 15 ), whereby the flow path of the exhaust gas in the direction of the environment ( 15 ) is lengthened.

1 . An exhaust muffler ( 100 ) for an internal combustion engine ( 11 ), especially a portable implement, comprising a catalyst ( 10 ) which is arranged in a housing ( 12 ) which has at least one inlet opening ( 13 ) and one outlet opening ( 14 ) for exhaust gas flowing out from the internal combustion engine ( 11 ) into the environment ( 15 ), characterised in that the outlet opening ( 14 ) has at least one means ( 16 ) through which exhaust gas flows, which is arranged partially outside the housing ( 12 ) and has an outlet ( 18 ) facing the environment ( 15 ), whereby the flow path of the exhaust gas in the direction of the environment ( 15 ) is lengthened.  
   
   
       2 . The exhaust muffler according to  claim 1 , characterised in that the means ( 16 ) has a labyrinth-shaped channel ( 29 ).  
   
   
       3 . The exhaust muffler according to  claim 1 , characterised in that the means ( 16 ) comprises a bent pipe ( 17 ).  
   
   
       4 . The exhaust muffler according to  claim 3 , characterised in that the pipe ( 17 ) has a helical-shaped profile.  
   
   
       5 . The exhaust muffler according to  claim 1 , characterised in that the outlet ( 18 ) has the form of a diffuser.  
   
   
       6 . The exhaust muffler according to  claim 3 , characterised in that the pipe ( 17 ) is constructed with a plurality of openings ( 19 ).  
   
   
       7 . The exhaust muffler according to  claim 3 , characterised by at least one bypass pipe ( 20 ) which guides at least some of the exhaust gas flowing out from the internal combustion engine ( 11 ) past the catalyst ( 10 ) into the means ( 16 ).  
   
   
       8 . The exhaust muffler according to  claim 7 , characterised in that an air baffle plate ( 22 ) is provided for specific guidance of cooling air to or over the pipe ( 17 ) or a channel ( 29 ).  
   
   
       9 . The exhaust muffler according to  claim 8 , characterised in that the air baffle plate ( 22 ) is a protective element against direct contact of the pipe ( 17 ) or the channel ( 29 ).  
   
   
       10 . The exhaust muffler according to  claim 9 , characterised in that the protective element air baffle plate ( 22 ) is constructed such that it can be placed subsequently on the housing ( 12 ).  
   
   
       11 . The exhaust muffler according to  claim 9 , characterised in that the protective element air baffle plate ( 22 ) is constructed from a perforated sheet to reduce the weight.  
   
   
       12 . The exhaust muffler according to  claim 1 , characterised in that the catalyst ( 10 ) is arranged on one region of the outlet opening ( 14 ).  
   
   
       13 . The exhaust muffler according to  claim 1 , characterised in that a dividing wall ( 24 ) is arranged inside the housing ( 12 ) so that a first space ( 26 ) and a second space ( 27 ) is formed inside the housing ( 12 ), wherein the catalyst ( 10 ) is arranged at the dividing wall ( 24 ) and connects the first and the second space ( 26 ,  27 ).  
   
   
       14 . The exhaust muffler according to  claim 13 , characterised in that the dividing wall ( 24 ) has at least one bypass opening ( 25 ).  
   
   
       15 . The exhaust muffler according to  claim 1 , characterised in that the housing ( 12 ) is constructed with an insulating layer.  
   
   
       16 . The exhaust muffler according to  claim 1 , characterised in that insulating material is arranged inside the housing ( 12 ).  
   
   
       17 . The exhaust muffler according to  claim 1 , characterised in that the outlet ( 18 ) has a spark arrester screen.  
   
   
       18 . A portable implement with an internal combustion engine comprising an exhaust muffler ( 100 ) according to  claim 1.