Abstract: A heat exchanger and a method for manufacturing the same provides a double pipe heat exchanger including an outer pipe, an inner pipe forming a first fluid passage and a second fluid passage between the inner pipe and the outer pipe, first and second connecting pipes to pass fluid from the outside and exhaust the fluid by connecting ends of the outer pipe, and a connector to connect the inner pipe and each connecting pipe to the outer pipe. The connector includes expanded 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.

Abstract: A heat exchanger and a method for manufacturing the same provides a double pipe heat exchanger including an outer pipe, an inner pipe forming a first fluid passage and a second fluid passage between the inner pipe and the outer pipe, first and second connecting pipes to pass fluid from the outside and exhaust the fluid by connecting ends of the outer pipe, and a connector to connect the inner pipe and each connecting pipe to the outer pipe. The connector includes expanded 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.

Abstract: A double pipe heat exchanger and a method of manufacturing the same are provided. The double pipe heat exchanger including an outer pipe and an inner pipe having a first flow channel therein and having an outer diameter smaller than an inner diameter of the outer pipe and inserted into the outer pipe to form a second flow channel between the inner pipe and the outer pipe includes a plurality of first grooves formed in a spiral shape in a lengthwise direction at an outer circumferential surface of the inner pipe to enable the second flow channel to have at least partially a spiral shape and at least one second groove each formed in a portion between two first grooves adjacent to an outer circumferential surface of the inner pipe and formed along the first groove.

Abstract: A heat exchanger and a method for manufacturing the same provides a double pipe heat exchanger including an outer pipe, an inner pipe forming a first fluid passage and a second fluid passage between the inner pipe and the outer pipe, first and second connecting pipes to pass fluid from the outside and exhaust the fluid by connecting ends of the outer pipe, and a connector to connect the inner pipe and each connecting pipe to the outer pipe. The connector includes expanded 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.

Abstract: A double pipe heat exchanger and a method of manufacturing the same are provided. The double pipe heat exchanger including an outer pipe and an inner pipe having a first flow channel therein and having an outer diameter smaller than an inner diameter of the outer pipe and inserted into the outer pipe to form a second flow channel between the inner pipe and the outer pipe includes a plurality of first grooves formed in a spiral shape in a lengthwise direction at an outer circumferential surface of the inner pipe to enable the second flow channel to have at least partially a spiral shape and at least one second groove each formed in a portion between two first grooves adjacent to an outer circumferential surface of the inner pipe and formed along the first groove.