| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal heat exchanger having a structure requiring no brazing between both ends of an outer tube and an inner tube.SOLUTION: On both ends of an outer tube 12, the diameter of an inner peripheral surface 12a of the outer tube 12 is reduced so as to be held in contact with an outer peripheral surface 11a of an enlarged diameter part 11b of an inner tube 11, and the inner peripheral surface 12a of the outer tube 12 and an airtight member 14 fitted to a fitting groove part 11f of the inner tube 11 are held in contact with each other, thereby ensuring airtightness of a refrigerant flow passage 16 against atmosphere. |
