Waste gas heat exchanger

Abstract

The invention relates to a waste gas heat exchanger comprising at least one bank of tubes ( 2, 3 ) through which waste gas can flow, the tube ends ( 4, 5 ) being respectively connected to a tube bottom ( 6 ) in a material fit, and a housing envelope ( 7 ) which surrounds the bank of tubes and through which a coolant can flow, one of the two tube bottoms being connected to the housing envelope (fixed bearing) in a fixed manner. According to the invention, the other tube bottom ( 6 ) is embodied as a movable bearing and forms a sliding seat ( 13 ) with the housing envelope ( 7 ), said sliding seat being in communication with the coolant side ( 8 ) on one side thereof and with the outer side (atmosphere) on the other side thereof.

1 . An exhaust gas heat exchanger having at least one tube bank, through which exhaust gas can flow and the tube ends of which are each integrally connected to a tube sheet, and having a casing shell which surrounds the tube bank and through which a coolant can flow, and that one of the two tube sheets is firmly connected to the casing shell (fixed bearing), characterized in that the other tube sheet ( 6 ,  30 ) is designed as a movable bearing and forms together with the casing shell ( 7 ,  32 ) a sliding seat ( 13 ,  40 ,  41 ) which is connected to the coolant side ( 8 ) on the one hand and to the outside (atmosphere) on the other hand.  
     
     
         2 . The exhaust gas heat exchanger as claimed in  claim 1 , characterized in that the sliding seat ( 14 ,  40 ,  41 ) is arranged on the outside of the casing shell ( 7 ,  32 ).  
     
     
         3 . The exhaust gas heat exchanger as claimed in  claim 1 , characterized in that the sliding seat ( 13 ,  40 ,  41 ) has an annular groove ( 14 ,  37 ) with an O-ring ( 15 ,  38 ).  
     
     
         4 . The exhaust gas heat exchanger as claimed in  claim 1 , characterized in that the tube sheet ( 6 ,  30 ) has an annular flange ( 10 ,  31 ) which projects beyond the casing shell ( 7 ,  32 ) and carries the sliding seat ( 13 ,  40 ,  41 ).  
     
     
         5 . The exhaust gas heat exchanger as claimed in  claim 4 , characterized in that the sliding seat ( 13 ,  40 ) is formed by a sealing flange ( 12 ,  39 ) which is connected to the annular flange ( 10 ,  31 ).  
     
     
         6 . The exhaust gas heat exchanger as claimed in  claim 4 , characterized in that an annular part ( 36 ) is fastened to the end face of the casing shell ( 32 ), this annular part ( 36 ) accommodating the O-ring ( 38 ) in an annular groove ( 37 ) and, together with a sealing flange ( 39 ) fastened to the tube sheet ( 30 ,  31 ), forming the sliding seat ( 40 ,  41 ).  
     
     
         7 . The exhaust gas heat exchanger as claimed in  claim 1 , characterized in that the annular flange ( 10 ) is connected via a gasket ( 20 ) to a connection flange ( 17 ) for the exhaust gas line.  
     
     
         8 . The exhaust gas heat exchanger as claimed in  claim 1 , characterized in that the flange parts ( 12 ,  10 ,  17 ) form a flanged connection.