Tank structure of heat exchanger

Abstract

In a tank structure of a heat exchanger having a narrow width header plate, to reduce thermal stress generated in a tube on the outermost side of the header plate in a lengthwise direction. Insertion holes, except for end-portion tube insertion holes at least located at end portions of a header plate in the lengthwise direction, are linked with deformation prevention beads formed along the lengthwise direction of the header plate, and the end-portion tube insertion holes are not linked with the deformation prevention beads.

1 . A tank structure of a heat exchanger, comprising:
 a header plate having a plurality of flat tube insertion holes constituted of a pair of facing short side portions and a pair of long side portions linking the both short side portions;   a plurality of flat tubes whose end-portions have been inserted into the respective tube insertion holes, and the insertion portions have been brazed;   a tank main body to which a rim of the header plate is fixed by caulking, and   the short side portions of the plurality of tube insertion holes are located in a width direction of the header plate, and their tube insertion holes are arranged separately each other in a lengthwise direction of the header plate, wherein:   respective tube insertion holes, except for end-portion tube insertion holes at least located at end-portions in the lengthwise direction, are linked by deformation prevention beads formed along the lengthwise direction of the header plate; and   the end-portion tube insertion holes are not linked by the deformation prevention beads.   
     
     
         2 . The tank structure of a heat exchanger according to  claim 1 , wherein:
 a low burring having low height is formed on a hole brim of the short side portions of the respective tube insertion holes, while a high burring higher than the low burring is formed on the long side portions of the respective tube insertion holes except for at least the end-portion tube insertion holes; and   the low burring is formed on the hole brim of the end-portion tube insertion holes throughout the entire circumference thereof.   
     
     
         3 . The tank structure of a heat exchanger according to  claim 1 , wherein:
 the low burring having low height is formed on a hole brim of the short side portions of the respective tube insertion holes, and the high burring higher than the low burring is formed on the long side portions of the respective tube insertion holes except for at least the end-portion tube insertion holes; and   the low burring is formed on hole brims of both end-portions of the long side portions of at least the end-portion tube insertion holes, and the high burring is formed on a hole brim of the long side portion except for both end-portions thereof.   
     
     
         4 . A tank structure of a heat exchanger, including:
 a header plate having a plurality of flat tube insertion holes constituted of a pair of facing short side portions and a pair of long side portions linking the both short side portions;   a plurality of flat tubes whose end-portions have been inserted into the respective tube insertion holes, and the insertion portions have been brazed; and   a tank main body to which a rim of the header plate is fixed by caulking, in which   the short side portions of the plurality of tube insertion holes are located in a width direction of the header plate, and their tube insertion holes are arranged separately each other in a lengthwise direction of the header plate,   
       wherein:
 the tank main body harbors a partition portion that divides the same into a plurality of zones in a lengthwise direction; 
 a dummy tube insertion hole is formed at the header plate located near the partition portion, and the end-portion tube insertion hole with a plurality of tube insertion holes in parallel on both sides of the dummy tube insertion hole; 
 flat tubes are inserted into respective tube insertion holes; 
 respective tube insertion holes, except for the dummy tube insertion hole and an end-portion tube insertion hole located at least to the first from the dummy tube insertion hole, are linked by the deformation prevention beads formed along the lengthwise direction of the header plate; and 
 formed so that the deformation prevention beads do not exist for the dummy tube insertion hole and the end-portion tube insertion hole located at least to the first from the dummy tube insertion hole. 
 
     
     
         5 . The tank structure of a heat exchanger according to  claim 4 , wherein:
 the low burring is formed on short side portions of the respective tube insertion holes;   the high burring is provided for the long side portions of the respective tube insertion holes except for the dummy tube insertion hole and the end-portion tube insertion hole located at least to the first from the dummy tube insertion hole; and   the low burring is provided for the end-portion tube insertion hole located at least to the first from the dummy tube insertion hole throughout the entire circumference thereof.