Brazable Component And Heat Exchanger Comprising Same

Abstract

The brazable component for the circulation of a fluid in a heat exchanger, in particular for a motor vehicle, according to the invention, comprises an aluminum alloy core 4 . It further comprises a pure aluminum protective layer 8 placed against the core 4.

1 . A brazable component for the circulation of a fluid in a heat exchanger for a motor vehicle, the brazable component comprising an aluminum alloy core, wherein the brazable component further comprises a pure aluminum protective layer placed against the core. 
     
     
         2 . The component as claimed in  claim 1 , wherein the protective layer comprises an aluminum weight percentage which is greater than or equal to 99.5%. 
     
     
         3 . The component as claimed in  claim 1 , wherein the core has a first surface on which the protective layer extends evenly. 
     
     
         4 . The component as claimed in  claim 1 , wherein the core has a second surface, opposite the first surface, and wherein the component comprises a second pure aluminum protective layer which is placed against the second surface. 
     
     
         5 . The component as claimed in  claim 1 , wherein the two protective layers have the same composition. 
     
     
         6 . The component as claimed in  claim 1 , wherein the product of the mechanical strength after brazing of the component by the component thickness is greater than or equal to 46800 MPa.μm. 
     
     
         7 . The component as claimed in  claim 1 , wherein the component has a thickness of between 200 μm and 530 μm. 
     
     
         8 . The component as claimed in  claim 1 , wherein the thickness of the protective layer is between 25 μm and 80 μm. 
     
     
         9 . The component as claimed in  claim 1 , wherein the protective layer is placed between the core and a layer of solder for the assembly by brazing of the component to another component, the ratio between the thickness of the layer of solder and the thickness of the protective layer being between 0.3 and 1. 
     
     
         10 . The component as claimed in  claim 9 , wherein the thickness of the layer of solder is between 4% and 10% of the total thickness. 
     
     
         11 . The component as claimed in  claim 1 , wherein the component is a tube. 
     
     
         12 . The component as claimed in  claim 1 , wherein the component is a plate. 
     
     
         13 . A heat exchanger for motor vehicles, for the exchange of heat between a first fluid circulating in a first circuit and a second fluid circulating in a second circuit that is separate from the first circuit, wherein the heat exchanger comprises a plurality of components as claimed in  claim 1 , the surface of at least one of the plurality of components comprising the protective layer belonging to the first circuit. 
     
     
         14 . The exchanger as claimed in  claim 13 , wherein the first fluid comprises recirculated exhaust gases. 
     
     
         15 . The exchanger as claimed in  claim 13 , wherein, after brazing, the product of the mechanical strength of the component by the thickness of the core of the component is greater than or equal to 46800 MPa.μm. 
     
     
         16 . The exchanger as claimed in  claim 13 , wherein the components are stacked plates. 
     
     
         17 . The exchanger as claimed in  claim 13 , wherein the components are tubes placed in parallel. 
     
     
         18 . The exchanger as claimed in  claim 17 , wherein the tubes are separated by dividers. 
     
     
         19 . The exchanger as claimed in  claim 17 , wherein disturbing elements are placed inside the tubes.