Patent ID: 6098704
Filing Date: 2000-08-08
Classification: B21C,B23P,F28D,F28F

Abstract:
A heat exchanger carrying out heat exchange between a first fluid and a second fluid, which is connected to a first external pipe through which the first fluid flows and a second external pipe through which the second fluid flows, comprising:a double pipe construction in which an inner pipe, an outer pipe and a connecting wall to connect the inner pipe and the outer pipe are unitarily formed by one of an extruding process and a draw forming process, said inner pipe and said outer pipe forming a first passage through which the first fluid flows therebetween, said inner pipe forming a second passage through which the second fluid flows;a removed portion formed at a longitudinal end of said double pipe construction, said removed portion being formed by removing a part of said outer pipe for a specified distance from said longitudinal end to fully expose said inner pipe for said specific distance;a first connecting member connected to said exposed inner pipe and said outer pipe, said first connection sealingly connecting said first passage with said first external pipe; anda second connecting member connected to a longitudinal end of said exposed inner pipe, said second connecting member communicating said second passage with said second external pipe.