To solve the problem of a conventional technology, wherein, since a previously coated brazing material is poured into a recessed part formed in the outer surface of a core tube (a heat transfer tube) and a coiled tube is arranged above the recessed part to cover the recessed part, unevenness is easily caused in positioning of the recessed part and the coiled tube, and wherein, since a protruding shape is machined in order from an end of the heat transmitting tube when forming the protrusion in the inner surface of the heat transmitting tube, it takes long time to manufacture the tube.
This heat exchanger has: a heat transfer tube 1 formed with a spiral crest and trough part on the outer surface and the inner surface thereof and provided with an irregular part 7 in the spiral angular part 6 in the inner surface; and a coiled tube 4 spirally wound around the outer surface of the heat transfer tube 3 along the trough part 3.
| JP2002181490 | HEAT EXCHANGER AND METHOD OF HEAT EXCHANGE |
| JPS58182003 | 【考案の名称】油圧用オイルク-ラ- |
KAWAI TAKAHIKO
HARADA MITSUHIRO
| JP2006090697A | 2006-04-06 | |||
| JP2004249580A | 2004-09-09 |
Masuo Oiwa
Toshihide Kodama
Keigo Murakami