PROBLEM TO BE SOLVED: To solve a problem in a conventional capillary tube embracing heat transfer tube that capillary tubes are embraced in close contact with grooves of a large diameter tube, but when designed pressure or higher is applied to the interior of the large diameter tube, the large diameter tube expands to form a clearance between itself and the capillary tubes to thereby cause the deterioration of heat exchange efficiency, and, in the worst case, the detachment of the capillary tubes from the grooves of the large-diameter tube may be caused to stop carrying out a heat exchange function.;SOLUTION: An outer tube is inserted around the large diameter tube embracing the capillary tubes, and diameter reduction working is carried out to attain close contact, thus improving a close contact property and pressure tightness.;COPYRIGHT: (C)2009,JPO&INPIT
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