Heat exchanger for gases, especially for engine exhaust gases

Abstract

It comprises a plurality of parallel conduits ( 3 ) provided inside a housing ( 2 ), through which gases to be cooled flow in heat exchange with a cooling fluid, said conduits ( 3 ) being attached between two plates ( 7 ) fixed in both ends of said housing ( 2 ), and the housing ( 2 ), and the housing ( 2 ) and the plates ( 7 ) having an area substantially rectangular. It is characterized in that each plate ( 7 ) comprises dimples ( 9 ) arranged near to its perimeter area, said dimples ( 9 ) including nails ( 10 ) capable of being into contact with a peripherical area ( 11 ) of the housing ( 2 ). It is possible to immobilize the plates during handling and application of brazing paste.

1 . Heat exchanger ( 1 ) for gases, especially engine exhaust gases, comprising a plurality of parallel pipes ( 3 ) arranged inside a casing ( 2 ), through which gases flow to be cooled by thermal exchange with a refrigeration fluid, said pipes ( 3 ) being connected between two support plates ( 7 ) anchored at both ends of said casing ( 2 ), and the casing ( 2 ) and the support plates ( 7 ) having a substantially rectangular cross-section, characterized in that each support plate ( 7 ) comprises protuberances ( 9 ) arranged in proximity to its peripheral zone, said protuberances ( 9 ) including raised portions ( 10 ) able to come into contact with a peripheral surface area ( 11 ) of the casing ( 2 ).  
   
   
       2 . Exchanger ( 1 ), according to  claim 1 , characterized in that the protuberances ( 9 ) are arranged symmetrically on each support plate ( 7 ).  
   
   
       3 . Exchanger ( 1 ), according to  claim 1  or  2 , characterized in that each support plate ( 7 ) comprises at least four protuberances ( 9 ).  
   
   
       4 . Exchanger ( 1 ), according to  claim 3 , characterized in that each support plate ( 7 ) comprises six protuberances ( 9 ), four protuberances ( 9 ) being arranged at each corner of the support plate ( 7 ), and the two remaining ones arranged in the median zone of two opposite laterals.  
   
   
       5 . Exchanger ( 1 ), according to any one of the previous claims, characterized in that the raised portions ( 10 ) of the protuberances ( 9 ) are orientated towards the inside of the exchanger ( 1 ) in order to assemble the support plates ( 7 ) with the casing ( 2 ).  
   
   
       6 . Exchanger ( 1 ), according to any one of the previous claims, characterized in that the height of the raised portions ( 10 ) is 0.5 mm with a tolerance of +0.1/−0.2 mm.  
   
   
       7 . Exchanger ( 1 ), according to any one of the previous claims, characterized in that the diameter of the protuberances ( 9 ) is 2 mm with a tolerance of +0/−0.2 mm.  
   
   
       8 . Exchanger ( 1 ), according to any one of the previous claims, characterized in that the distance from the protuberances ( 9 ) to the edge of the support plate ( 7 ) is approximately 1.05 mm with a tolerance of +0.1/−0 mm.