| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel structure of a heating tube having a reinforced central structure of a B-shaped tube design, in which a specially and separately designed body of corrugated web defines a channel. SOLUTION: The folding heating tube (10) for a heat exchanger is constituted of a pair of vertical walls (16) which are in contact with each other and internally extending in the longitudinal direction, and a lower wall (12) and an upper wall (14) which are connected by the walls (16), so as to raise stiffness of the tube. The tube is provided therein with a separately prepared inner web member (20) which is fixed between a pair of outwardly curved surface legs (18) formed on the contacting walls (16) and the lower wall (12). A wide and flat central groove (24) of the web member (20) is engaged with the lower surfaces of the legs (18), and the width of the groove (24) is approximately the same as the total width of the two legs (18). |
