| 摘要 |
A flat tube 1 comprises an upper wall 2 , a lower wall 3 , left and right side walls 4, 5 interconnecting the upper and lower walls 2, 3 at respective left and right side edges thereof, and a plurality of reinforcing walls 6 interconnecting the upper and lower walls 2, 3 and positioned between the left and right side walls 4, 5 . The tube 1 has parallel fluid channels 7 inside thereof, and each of the reinforcing walls 6 has communication holes 8 for holding the adjacent fluid channels 7 in communication with each other therethrough. The reinforcing wall 6 is formed from a downward ridge 11 integral with the upper wall 2 and an upward ridge 12 integral with the lower wall 3 , by brazing the two ridges to each other. Only one of the downward ridge 11 and the upward ridge 12 forming the reinforcing wall 6 is provided with a plurality of cutouts 13, 14 . The openings of the cutouts 13, 14 are closed with the other ridge 11, 12 having no cutouts to thereby form the communication holes 8 . The ridges 11, 12 forming the reinforcing wall 6 are brazed with an enhanced strength. |
