Heat exchange device and method of manufacturing the same

Abstract

To provide a heat exchange device having tubes both ends thereof are fitted into a connecting pipe thereby exchanging heat at a surface of the tube, and a method of manufacturing the same. In a heat exchange device 1, both ends of a plurality of tubes 2 for letting through a second heat medium 4 are fitted tightly into connecting tubes 5 while being contacted with a first heat medium 3 thereby exchanging heat between the first and the second heat media 3 and 4, and an inner diameter of the connecting pipe 5 is larger at the side in which the tubes 2 are fitted.

1 . A heat exchange device, comprising: a first heat medium and a second heat medium exchanging heat mutually; and a plurality of narrow tubes for letting through one of the heat media; wherein:
 end portions of the plurality of narrow tubes is gathered to seal a clearance among the tubes liquid-tightly or air-tightly; and   the gathered ends of the narrow tubes are fitted into a connecting pipe whose diameter is larger than that of the gathered tubes liquid-tightly or air-tightly; and   an inner diameter of an end portion of the connecting pipe to which the narrow tubes are fitted is larger than that of the other end portion thereof.   
   
   
       2 . The heat exchange device as set forth in  claim 1 , further comprising:
 a hollow header; and   a plurality of holes formed on one of the surfaces of the header;   wherein the connecting pipe is fitted into the hole liquid-tightly or air-tightly.   
   
   
       3 . A method for manufacturing a heat exchange device having a plurality of narrow tubes, comprising:
 gathering end portions of the plurality of narrow tubes to seal a clearance among the narrow tubes liquid-tightly or air-tightly; and   fitting the gathered ends of the narrow tubes into a connecting pipe while contracting the connecting pipe diametrically.   
   
   
       4 . The method for manufacturing a heat exchange device as set forth in  claim 3 , comprising:
 contracting the connecting pipe diametrically by stretching the connecting pipe in its axial direction, after fitting the gathered end of the narrow tubes into the connecting pipe.   
   
   
       5 . The method for manufacturing a heat exchange device as set forth in  claim 3 , wherein:
 after fitting the gathered end of the narrow tubes into the connecting pipe, the connecting pipe is contracted diametrically by applying a tension in an axial direction of the connecting pipe.   
   
   
       6 . The method for manufacturing a heat exchange device as set forth in  claim 3 , comprising:
 fitting the connecting pipe into a hole formed on a surface of a header.   
   
   
       7 . The method for manufacturing a heat exchange device as set forth in  claim 6 , wherein:
 the hole comprises a circular flange for holding the connecting pipe fitted therein tightly.   
   
   
       8 . The method for manufacturing a heat exchange device as set forth in  claim 4 , comprising:
 fitting the connecting pipe into a hole formed on a surface of a header.   
   
   
       9 . The method for manufacturing a heat exchange device as set forth in  claim 5 , comprising:
 fitting the connecting pipe into a hole formed on a surface of a header.   
   
   
       10 . The method for manufacturing a heat exchange device as set forth in  claim 8 , wherein:
 the hole comprises a circular flange for holding the connecting pipe fitted therein tightly.   
   
   
       11 . The method for manufacturing a heat exchange device as set forth in  claim 9 , wherein:
 the hole comprises a circular flange for holding the connecting pipe fitted therein tightly.