Tube bottom and heat exchanger

Abstract

A tube bottom for a heat exchanger, with a bottom region having slot-type openings, wherein the slot-type openings are rimmed by eyelets and the tube bottom has an attached rim region. Formed between the eyelets and the attached rim region is a U-shaped trough as a receiving region for the foot of a box-like cover. The U-shaped trough has an inner first wall, the attached rim region and a second wall forming the trough bottom, wherein the inner first wall has at least one hump-like raised portion in the continuation of an eyelet on a side oriented toward the U-shaped trough, which bounds the breadth of the U-shaped trough between the attached rim region and the first wall and extends from the trough bottom to that end region of the eyelet oriented toward the U-shaped trough. A depression is formed in the hump-like raised portion.

What is claimed is: 
     
         1 . A tube bottom for a heat exchanger, the tube bottom comprising:
 a bottom region with slot-type openings rimmed by eyelets, the tube bottom having an attached rim region; and   a U-shaped trough formed between the eyelets and the attached rim region as a receiving area for the bottom of a box-like cover, the U-shaped trough being formed by an inner first wall, the attached rim region and a second wall forming a trough bottom,   wherein the inner first wall has at least one hump-like portion in an extension of an eyelet on a side facing the U-shaped trough, which bounds a breadth of the U-shaped trough between the attached rim region and the first wall and extends from the trough bottom to the end region of the eyelet facing the U-shaped trough, and   wherein a depression is formed in the hump-like portion as a lead-in chamfer for tubes.   
     
     
         2 . A tube bottom according to  claim 1 , wherein a displacement of the material towards the side of the first wall facing away from the U-shaped trough is formed by the molded-in depression. 
     
     
         3 . A tube bottom according to  claim 1 , wherein a deflection of the hump-like portion from the inner wall increases from the trough bottom towards the respective eyelet. 
     
     
         4 . A tube bottom according to  claim 1 , wherein the hump-like portion extends into the bottom region and at least partly surrounds the eyelet. 
     
     
         5 . A tube bottom according to  claim 1 , wherein the first wall has a lead-in chamfer on its side facing away from the U-shaped trough, wherein the lead-in chamfer is arranged on the hump-like portion and the lead-in chamfer creates a tapering of the slot-type openings rimmed by the eyelets. 
     
     
         6 . A tube bottom according to  claim 5 , wherein the lead-in chamfer is formed on the molded-in depression. 
     
     
         7 . A tube bottom according to  claim 5 , wherein the slot-type openings have two opposing narrow sides and two opposing wide sides, wherein a slot-type opening is tapered by lead-in chamfers on the narrow side and on the end regions of the wide sides facing the narrow side. 
     
     
         8 . A tube bottom according to  claim 1 , wherein the hump-like portion and/or the depression is impressed into the tube bottom in the hump-like portion or molded in by thermoforming. 
     
     
         9 . A tube bottom according to  claim 1 , wherein the first wall and the surface of the hump-like portion oriented to the U-shaped trough are directed towards the trough bottom at an angle of more than 90 degrees. 
     
     
         10 . A tube bottom according to  claim 1 , wherein the surface of the hump-like portion facing the U-shaped trough provides a centering aid for inserting the box-like cover into the U-shaped trough. 
     
     
         11 . A heat exchanger with two tube bottoms according to  claim 1 , wherein the heat exchanger has a plurality of tubes, which are arranged parallel to each other and are accommodated at their ends in each case in an opening of a tube bottom rimmed by an eyelet, wherein the tubes are each inserted in respective openings along the lead-in chamfers, and wherein a box-like cover, which is connected to the respective tube bottom, is inserted into the U-shaped trough of each tube bottom.