SCAMBIATORE DI CALORE DI MATERIALE PLASTICO.

摘要

A heat exchanger (10) comprising a plurality of plastic tubes (12) arranged in a series of mutually parallel rows and a pair of plastic collector plates (14) bonded to the respective ends of the said tubes (12). Each collector plate (14) is formed by a plurality of plastic terminal elements (22), each of which has at least one set of semicircular seats (24 and 26) suitable for receiving the ends of a row of tubes (12). The said semicircular seats (24 and 26) of each terminal element (22) are separated from each other by bonding portions (28 and 30) suitable for welding to the corresponding bonding portions of a complementary terminal element along a welding plane (34). The bonding portions (28) of the first terminal element (22') have butt surfaces (36) that are set back with respect to the said welding plane (34) while the bonding portions (30) of the second terminal element (22") destined to be bonded to the first terminal element (22') have welding portions (38) projecting across the said welding plane (34). The ratio (R) between the volume of the said welding portions (38) and the volume between the butt portions (36) and the said welding plane (34) is in the range 0.8 to 1.3.