Extruded tube for a heat exchanger

Abstract

An extruded tube for a heat exchanger is provided that includes two at least approximately parallel outer side walls that extend in a longitudinal direction and a transverse direction of the extruded tube and that are connected by two outer narrow sides in a vertical direction of the extruded tube, wherein at least one continuous web extends between the side walls in the longitudinal direction and in the vertical direction and separates at least two ducts of the extruded tube, and wherein at least one of the outer side walls has embossings that serve to form both bulged portions that project into the ducts of the side walls and also bulged portions that extend substantially in the transverse direction of the web, wherein the bulged portions of the at least one web have a controlled orientation with respect to the transverse direction.

1 . An extruded tube for a heat exchanger, the extruded tube comprising
 two at least approximately parallel outer side walls, which extend in a longitudinal direction and a transverse direction of the extruded tube and are connected by two outer narrow sides in a vertical direction of the extruded tube; and   at least one continuous web extending between the side walls in the longitudinal direction and in the vertical direction and separating at least two channels of the extruded tube,   wherein at least one of the outer side walls has impressions that form bulges of the side walls, the bulges projecting into the channels and extending substantially in the transverse direction, and   wherein bulges of the at least one web have a controlled orientation relative to the transverse direction.   
     
     
         2 . The extruded tube according to  claim 1 , wherein at least one of the channels of the extruded tube in the longitudinal direction has a regular, wave-shaped course with respect to the transverse direction. 
     
     
         3 . The extruded tube according to  claim 1 , wherein a distance in the transverse direction between two neighboring webs is substantially constant. 
     
     
         4 . The extruded tube according to  claim 1 , wherein at least one of the impressions has an elongated form, and wherein a majority of webs are overlapped and bulged out by the same impression. 
     
     
         5 . The extruded tube according to  claim 4 , wherein the elongated impression has an orientation angle to the transverse direction. 
     
     
         6 . The extruded tube according to  claim 5 , wherein the orientation angle is approximately between 0° and 45°, in particular approximately between 20° and 45°, or in particular approximately between 28° and 42°. 
     
     
         7 . The extruded tube according to  claim 1 , wherein at least one of the impressions coincides substantially only with the at least one web. 
     
     
         8 . The extruded tube according to  claim 1 , wherein at least one of the impressions does not coincide with a web. 
     
     
         9 . The extruded tube according to  claim 8 , wherein the impression has an orientation opposite to the transverse direction. 
     
     
         10 . The extruded tube according to  claim 9 , wherein an orientation angle of the impression relative to the transverse direction is approximately between 0° and 45°, approximately between 25° and 45°, or approximately between 30° and 40°. 
     
     
         11 . The extruded tube according to  claim 1 , wherein at least one of the impressions is made winglet-shaped, or wherein at least one of the impressions is made as elongated winglets. 
     
     
         12 . The extruded tube according to  claim 10 , wherein the winglet-shaped impression has a length-to-width ratio of between 1.2 and 5, preferably between 2 and 5, especially preferably between 2.5 and 3.2, or preferably between 1.5 and 3, especially preferably between 1.8 and 2.5. 
     
     
         13 . The extruded tube according to  claim 1 , wherein the orientations of at least some bulges of neighboring webs, which are substantially at the same height in the longitudinal direction, are the same. 
     
     
         14 . A heat exchanger for a motor vehicle, comprising an extruded tube according to  claim 1 . 
     
     
         15 . A method for producing an extruded tube according to  claim 1 , the method comprising:
 producing the extruded tube by an extrusion process; and   subsequently impressing the impressions in the side walls.