Spiral corrugated copper-aluminum connecting pipe

The utility model discloses a spiral corrugated copper-aluminum connecting pipe which comprises a copper pipe (1) and an aluminum pipe (2), a welding portion (3) is arranged at the end of the copper pipe (1), the outer diameter of the welding portion (3) is not larger than the inner diameter of the aluminum pipe (2), and the welding portion (3) is in complete contact with the inner wall of the aluminum pipe (2). Spiral corrugations (4) are arranged on the copper pipe (1) or/and the aluminum pipe (2), the axial sections of the corrugations (4) are wide arcs (6) with the circle centers externally arranged, narrow arcs (7) with the circle centers internally arranged are connected between the wide arcs (6), and the radius of the narrow arcs (7) is smaller than that of the wide arcs (6). The connecting structure has the advantages of being high in installation flexibility and structural strength. 本实用新型公开了一种螺旋波纹铜铝连接管，包括铜管(1)和铝管(2)，铜管(1)的端部设有焊接部(3)，焊接部(3)的外径不大于铝管(2)的内径，且焊接部(3)与铝管(2)内壁完全接触；所述铜管(1)或/和铝管(2)上设有螺旋状的波纹(4)