Exhaust Gas Heat Exchange, in Particular an Exhaust Gas Cooler for Exhaust Gas Recirculation in a Motor Vehicle

Abstract

The invention relates to an exhaust gas heat exchanger, in particular, to an exhaust gas cooler for exhaust gas recirculation in a motor vehicle comprising heat exchanging conduits which are passed through by exhaust gases, surrounded by a coolant and linked to a distributing and/or collecting chambers comprising a flux guiding device which is provided with the exhaust gas input and output sides and a plurality of channels extending therebetween and inclined to each other

1 . Exhaust gas heat exchanger, in particular an exhaust gas cooler, for exhaust gas recirculation in motor vehicles, having heat exchanger channels through which exhaust gas can flow and which lead into a distributing and/or collecting chamber, having a flow conducting device arranged in the distributing and/or collecting chamber, the flow conducting device comprising an exhaust gas inlet surface, an exhaust gas outlet surface and a plurality of flow channels extending from the exhaust gas inlet surface to the exhaust gas outlet surface, wherein the flow channels are inclined relative to each other, the flow channels are inclined relative to a surface normal of the exhaust gas inlet and/or outlet surface, and/or the surface normals of the exhaust gas inlet and outlet surfaces are inclined relative to each other. 
   
   
       2 . Exhaust gas heat exchanger according to  claim 1 , wherein the flow conducting device is a catalytic converter, in particular oxidation or diesel oxidation catalyst. 
   
   
       3 . Exhaust gas heat exchanger according to  claim 1 , wherein the flow channels, the exhaust gas inlet surface normal and/or the exhaust gas outlet surface normal are inclined relative to a principal direction of flow of the heat exchanger channels. 
   
   
       4 . Exhaust gas heat exchanger according to  claim 1  wherein the flow channels are completely separate from each other. 
   
   
       5 . Exhaust gas heat exchanger according to  claim 1 , wherein the flow channels communicate with each other via apertures. 
   
   
       6 . Exhaust gas heat exchanger according to  claim 1 , wherein the exhaust gas outlet surface is as large as the exhaust gas inlet surface. 
   
   
       7 . Exhaust gas heat exchanger according to  claim 1 , wherein the exhaust gas outlet surface is smaller or larger than the exhaust gas inlet surface. 
   
   
       8 . Exhaust gas heat exchanger according to  claim 1  wherein the exhaust gas inlet or outlet surface is opposite the heat exchanger channels and in particular covers all the heat exchanger channels on the outlet or inlet side. 
   
   
       9 . Exhaust gas heat exchanger according to  claim 1  wherein a distance between the exhaust gas inlet or outlet surface and the heat exchanger channels is less than 15 mm, preferably less than 10 mm, particularly preferably less than 5 mm. 
   
   
       10 . Exhaust gas heat exchanger according to  claim 1 , wherein the flow channels are of rectilinear design. 
   
   
       11 . Exhaust gas heat exchanger according to  claim 1  wherein the flow channels are of curved design. 
   
   
       12 . Exhaust gas heat exchanger according to  claim 1  wherein the exhaust gas inlet and/or outlet surface is round, in particular circular. 
   
   
       13 . Exhaust gas heat exchanger according to  claim 1 , wherein the exhaust gas inlet and/or outlet surface is angular, in particular quadrangular or rectangular. 
   
   
       14 . Exhaust gas heat exchanger according to  claim 1 , wherein the exhaust gas inlet and/or outlet surface is curved, in particular cylindrical. 
   
   
       15 . Exhaust gas heat exchanger according to  claim 1 , wherein the exhaust gas inlet or outlet surface is surrounded by an annular channel for the exhaust gas. 
   
   
       16 . Exhaust gas heat exchanger according to  claim 1 , wherein the distributing and/or collecting chamber is designed as a diffuser and the flow conducting device in particular fills the diffuser cross-section. 
   
   
       17 . Exhaust gas heat exchanger according to  claim 1 , wherein the heat exchanger channels are formed by pairs of discs. 
   
   
       18 . Exhaust gas heat exchanger according to  claim 1 , wherein the heat exchanger channels are formed by tubes which are held with their tube ends in tube bottoms and surrounded by a housing which conducts the coolant. 
   
   
       19 . Exhaust gas heat exchanger according to  claim 1 , wherein the distributing and/or collecting chamber comprises a flange for connection to an exhaust pipe, in particular to an EGR pipe.