Heat exchanging unit for motor vehicles

Abstract

A heat exchanging unit for motor vehicles, having a first heat exchanger that has two headers that are situated parallel to one another and at a distance from one another and that are connected to one another fluidically via a multiplicity of connecting pipes situated parallel to one another and at a respective distance in the longitudinal direction of the headers, the connecting pipes opening into the first header asymmetrically with respect to the width of the pipe floor situated perpendicular to the longitudinal first header axis, and the second wall segment, in the cross-section regarded perpendicular to the header longitudinal axis, becoming increasingly further removed from the first end of the pipe floor as the wall segment extends towards the second end area of the pipe floor, regarded in the direction perpendicular to the longitudinal axis of the connecting pipes and perpendicular to the longitudinal header axis.

1 . A heat exchanging unit for motor vehicles, comprising: a first heat exchanger that has two headers situated essentially parallel to one another at a distance from one another, connected to one another fluidically via a multiplicity of connecting pipes that are situated parallel to one another and at a distance from one another in a longitudinal direction of the headers, a jacket wall of the respective header, extending around the respective longitudinal axis of the respective header, being limited in the direction facing the respective other header by a flat wall segment (the pipe floor), and the connecting pipes standing perpendicular to these flat pipe floors, and a first wall segment of the jacket wall of this first header being connected in a first end area of the pipe floor of the first header, and a second wall segment of the jacket wall of this first header being connected in the opposite, other end area of this pipe floor, and an inlet connecting piece opening into this first wall segment that is connected fluidically to the interior of the first header, and an outlet connecting piece opening in one of the headers that is connected fluidically to the interior of the relevant header, 
 the connecting pipes opening into the first header asymmetrically with respect to the width of the pipe floor oriented perpendicular to the longitudinal axis of the first header, and the second wall segment, in the cross-section regarded perpendicular to the header longitudinal axis, increasingly approaches the first end area or first end of the pipe floor as it extends away from the second end area of the pipe floor in the direction regarded perpendicular to the longitudinal axis of the connecting pipes and perpendicular to the longitudinal axis of the header.    
   
   
       2 . The heat exchanging unit as recited in  claim 1 , characterized in that the second wall segment of the first header of the first heat exchanger is convexly curved or has convexly curved segments, regarded in the cross-section perpendicular to the header longitudinal axis.  
   
   
       3 . The heat exchanging unit as recited in  claim 1 , characterized in that the second wall segment of the first header of the first heat exchanger has a straight construction or has straight segments, regarded in the cross-section perpendicular to the header longitudinal axis.  
   
   
       4 . The heat exchanging unit as recited in  claim 1 , characterized in that the inlet connecting piece extends perpendicular to the longitudinal axis of the connecting pipes.  
   
   
       5 . The heat exchanging unit as recited in  claim 1 , characterized in that the connecting pipes open asymmetrically into the pipe floor in such a way that their central longitudinal axes are at a greater distance from the first end of the pipe floor than is the central longitudinal axis of the pipe floor.  
   
   
       6 . The heat exchanging unit as recited in  claim 1 , characterized in that the connecting pipes are formed as flat pipes.  
   
   
       7 . The heat exchanging unit as recited in  claim 6 , characterized in that the flat pipes are situated in such a way that the planes fixed by them are situated parallel to one another and perpendicular to the longitudinal axis of the first header of the first heat exchanger.  
   
   
       8 . The heat exchanging unit, as recited  claim 1 , characterized in that it has a first heat exchanger having two headers that are essentially parallel to one another and are situated at a distance from one another and that are connected to one another fluidically via a multiplicity of connecting pipes situated parallel to one another and at a distance from one another in the longitudinal direction of the headers, the jacket wall of the respective header, extending around the respective longitudinal axis of the respective header, being limited in the direction facing the respective other header by a flat wall segment (the pipe floor), and the cross-section of the interior of at least one of these headers changing, preferably tapering, along its longitudinal axis.  
   
   
       9 . The heat exchanging unit as recited in  claim 1 , characterized in that the first header of the first heat exchanger changes in its cross-section along its longitudinal axis.  
   
   
       10 . The heat exchanging unit as recited in  claim 1 , characterized in that the first header of the first heat exchanger tapers in its cross-section along its longitudinal axis.  
   
   
       11 . The heat exchanging unit as recited in  claim 1 , characterized in that the inlet connecting piece is situated in a first axial end area of the first header.  
   
   
       12 . The heat exchanging unit as recited in  claim 11 , characterized in that the cross-section of the first header of the first heat exchanger tapers in the direction of the second axial end area of the first header.  
   
   
       13 . The heat exchanging unit as recited in  claim 1 , characterized in that the cross-section of the first header of the first heat exchanger tapers from its first axial end in the direction of the opposed, second axial end, in that the wall segment, situated opposite the floor wall, of the jacket wall of the first header of the first heat exchanger runs increasingly toward the floor wall along the longitudinal axis of the first header, in the direction oriented towards the second axial end.  
   
   
       14 . The heat exchanging unit as recited in  claim 1 , characterized in that the first header is limited at the side of the jacket wall facing away from the connecting pipes by a flat wall segment, or a flat wall.  
   
   
       15 . The heat exchanging unit as recited in  claim 1 , characterized in that the first header is constructed in one piece in the cross-section situated perpendicular to its longitudinal axis.  
   
   
       16 . The heat exchanging unit as recited in  claim 1 , characterized in that in a cross-section situated perpendicular to its longitudinal axis, the first header is constructed in multiple parts, in particular in two parts.  
   
   
       17 . The heat exchanging unit as recited in  claim 1 , characterized in that in a cross-section situated perpendicular to its longitudinal axis, the first header is constructed in two parts, the dividing plane being situated essentially parallel to the longitudinal axis of the connecting pipes.  
   
   
       18 . The heat exchanging unit as recited in  claim 17 , characterized in that the dividing plane is situated in the area of the wall pointing toward the first wall segment.  
   
   
       19 . The heat exchanging unit as recited in  claim 18 , characterized in that the wall having the first wall segment has an essentially flat construction, and has, at its end areas in the jacket direction of the first header, flanges that are bent off in essentially perpendicular fashion and that are connected in overlapping fashion to an end segment of the floor wall and of the wall situated opposite the floor wall.  
   
   
       20 . The heat exchanging unit as recited in  claim 1 , characterized in that the second wall segment of the first header of the first heat exchanger has a fluidic conducting function for the fluid supplied through the inlet connecting piece, and diverts this fluid flowing through the inlet connecting piece in the direction of the connecting pipes, or supports this deflection.  
   
   
       21 . The heat exchanging unit as recited in  claim 6 , characterized in that the flat pipes essentially have the same width and are situated such that they are positioned one over the other so as to essentially coincide.  
   
   
       22 . The heat exchanging unit as recited in  claim 1 , characterized in that the first heat exchanger is a radiator of a motor vehicle.  
   
   
       23 . The heat exchanging unit as recited in  claim 1 , characterized in that fluid flows through the connecting pipes essentially in parallel and in the same direction of flow.  
   
   
       24 . The heat exchanging unit as recited in  claim 1 , characterized in that a second heat exchanger is provided that is different from the first heat exchanger and that has a separate fluid circuit.  
   
   
       25 . The heat exchanging unit as recited in  claim 24 , characterized in that the second heat exchanger has two parallel headers situated at a distance from one another that are connected to one another fluidically via a multiplicity of connecting pipes situated in parallel.  
   
   
       26 . The heat exchanging unit as recited in  claim 24 , characterized in that the second heat exchanger is an air-conditioning condenser of a motor vehicle.  
   
   
       27 . The heat exchanging unit as recited in  claim 24 , characterized in that the first and/or the second heat exchanger is made of aluminum, and is preferably made essentially completely of aluminum.  
   
   
       28 . The heat exchanging unit as recited in  claim 24 , characterized in that the first and the second heat exchanger are connected to one another.  
   
   
       29 . The heat exchanging unit as recited in  claim 1 , characterized in that a sealing end plate is provided axially at the end of at least one of the headers, on one or both ends of the header, in particular on both axial ends of the first header of the first heat exchanger.  
   
   
       30 . The heat exchanging unit as recited in  claim 29 , characterized in that at least one cover plate of a first heat exchanger, situated axially on the end of a header, is a cover plate of the second heat exchanger, or is connected to such a cover plate.  
   
   
       31 . The heat exchanging unit as recited in  claim 24 , characterized in that the second wall, or the second wall segment, of the first header of the first heat exchanger faces the second heat exchanger, and the first wall, or the first wall segment, is situated on the side of the first heat exchanger facing away from the second heat exchanger.  
   
   
       32 . The heat exchanging unit as recited in  claim 1 , characterized in that the outlet connecting piece opens into the second header of the first heat exchanger.  
   
   
       33 . An assembly tool for assembling a heat exchanger having two headers and a multiplicity of connecting pipes situated in parallel that connect these headers, at least one of these headers being constructed in multiple parts, in particular in two parts, in its cross-section perpendicular to its longitudinal axis, and having in this cross-section an essentially U-shaped part that comprises a pipe floor that is provided with a multiplicity of openings for accepting the connecting pipes, the tool comprising: a tool element that can engage in this U-shape and having in its body along its longitudinal axis a multiplicity of laterally open slots that are situated in parallel and at a distance from one another axially, so that, using the tool, the U-shaped part can be grasped and placed on the connecting pipes so that the connecting pipes also extend into the tool element, and so that the tool element can subsequently be withdrawn on the basis of the slots.