| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a heat transfer tube in which a spring is surely closely kept into contact with an inner face of the heat transfer tube, and a fluid flowing along the axial direction is prevented from being accumulated in a clearance gap between the spring and the inner face of the heat transfer tube. <P>SOLUTION: In manufacturing the heat transfer tube 3, the spiral spring 4 is inserted into the heat transfer tube 3. In inserting the spring 4 into the heat transfer tube 3, the spring 4 is locked on locking sections 61 disposed on both ends of a rod member 6, and extended to reduce its outer diameter. The spring 4 in a state of being reduced in its outer diameter, is inserted into the heat transfer tube 3, and then the locking state is released to recover an original state, so that the spring is pressed to the inner face 31 of the heat transfer tube 3. A metal rod 5 as a brazing filler metal 51 is placed to be melted in a furnace, and spread over the whole face by capillary action. The metal rod 5 having a quantity to form curved boundary sections in the same direction between the spring 4 and the inner face 31 of the heat transfer tube 3, is used. <P>COPYRIGHT: (C)2012,JPO&INPIT |
