DOUBLE PIPE HEAT EXCHANGER AND METHOD FOR MANUFACTURING THE SAME

The present invention provides a double pipe heat exchanger and a method for manufacturing the same so that an inner pipe and each connecting pipe can be assembled with an outer pipe through a simple process by forming an outer pipe integrated connector. For this, the present invention provides a double pipe heat exchanger including an outer pipe, an inner pipe configured to form a first fluid passage internally and a second fluid passage between the inner pipe and the outer pipe by inserting in the outer pipe, a first connecting pipe and a second connecting pipe configured to pass a fluid from the outside and exhaust the fluid by connecting to both ends of the outer pipe, and a connector configured to connect the inner pipe and each connecting pipe to the outer pipe. The connector includes an expanding part formed by expanding both ends of the outer pipe and a reducing part configured to assemble the inner pipe inserted in the outer pipe with an end of each connecting pipe by forming at an end of each expanding part with a pressing process. The center line of the inner pipe connected to the connector is disposed at an upper side of the inner circumference surface of the outer pipe.