Exhaust silencer

Abstract

An exhaust silencer of a combustion engine, comprising a housing ( 1 ) that is to be connected to an exhaust pipe, through which housing the exhaust gases are arranged to be conducted and which comprises a reactive part ( 2 ) and an absorbing part ( 3 ) in the flow direction of the exhaust gases. The reactive part ( 2 ) is mainly hollow and comprises, at the inlet thereof, a first exhaust pipe ( 5 ) for feeding the exhaust gases to the reactive part ( 2 ) and, at its outlet, a second exhaust pipe ( 6 ) for directing the exhaust gases from the reactive part ( 2 ) to the absorbing part ( 3 ), both exhaust pipes ( 5, 6 ) being arranged so as to essentially extend inside the reactive part ( 2 ) of the housing. The absorbing part ( 3 ) comprises an absorbing filling element ( 7 ), which essentially fills the absorbing part ( 3 ) of the housing and, at the inlet of the absorbing part ( 3 ), is shaped so as to direct the exhaust gases to the space ( 8 ) between the filling element ( 7 ) and the inner lining of the housing ( 1 ).

1 . An exhaust silencer of a combustion engine, comprising a housing that is to be connected to an exhaust pipe, through which housing the exhaust gases are arranged to be conducted, the housing comprising a reactive part and an absorbing part in the flow direction of the exhaust gases, whereby the reactive part is mainly hollow and comprises, at the inlet thereof, a first exhaust pipe for feeding the exhaust gases to the reactive part and, at its outlet, a second exhaust pipe for directing the exhaust gases from the reactive part to the absorbing part, both the exhaust pipes being arranged to essentially extend inside the reactive part of the housing, wherein the absorbing part comprises an absorbing filling element, which essentially fills the absorbing part of the housing and, at the inlet of the absorbing part, is shaped so as to direct the exhaust gases from the central part of the housing to the space between the filling element and the inner lining of the housing. 
     
     
         2 . The silencer according to  claim 1 , wherein the first and second exhaust pipes are dimensioned so as to suppress the lowest frequencies of the exhaust noise by utilizing the mutual suppression interference of sonic waves. 
     
     
         3 . The silencer according to  claim 1 , wherein the mouths of first and second exhaust pipes, which are situated opposite each other, are arranged at a distance from each other. 
     
     
         4 . The silencer according to  claim 1 , wherein the first exhaust pipe extends inside the reactive part for about a fourth of the total length of the reactive part. 
     
     
         5 . The silencer according to  claim 1 , wherein the second exhaust pipe extends inside the reactive part for about a half of the total length of the reactive part. 
     
     
         6 . The silencer according to any of the preceding claims, wherein between the reactive part and the absorbing part, there are spark quenching means. 
     
     
         7 . The silencer according to  claim 6 , wherein the spark quenching means comprise a number of radially extending plate elements, which are shaped so as to direct the exhaust gas flow into a rotating movement around the filling element of the absorbing part. 
     
     
         8 . The silencer according to  claim 6 , wherein the housing comprises, in connection with the absorbing part and after the spark quenching means, a soot trap door in the longitudinal direction of the housing for recovering the soot particles and, if required, removing them from the housing. 
     
     
         9 . The silencer according to  claim 1 , wherein the filling element, on the side of the reactive part, is sharp-pointed. 
     
     
         10 . The silencer according to  claim 1 , wherein the filling element mainly consists of mineral wool, which is arranged inside a perforated plate, net or the like, which is supported on the housing. 
     
     
         11 . The silencer according to  claim 1 , wherein, in an operating situation, the housing is situated in the vertical direction, so that the exhaust gases are fed to the housing from below. 
     
     
         12 . The silencer according to  claim 9 , wherein the filling element, on the side of the reactive part, is conical.