Improved fin collar and method of manufacturing

摘要

A heat exchanger fin collar (20) for a plate-fin heat exchanger having close tolerance dimensions for achieving greater contact area on the tube (100). The fin collar (20) comprises an elongated fin portion (70) for dissipating heat and a leg (22) connected with the fin portion (20). The leg (22) has a height and includes a straight contact portion substantially perpendicular to the fin portion, wherein the contact portion has a contact height along which the contact portion contacts the tube (100). The height is in the range of 0.008 to 0.080 inches. It also includes a first curved end portion (68) having a first radius extending from a first end of the contact portion and a stepped transitional portion (50) connecting the contact portion (22) and the elongated fin portion (70). The transitional portion (50) has a second curved end portion having a second radius, wherein the second curved end portion extends from the contact portion opposite the first end. A method for forming the fin collar (20) and a heat exchanger are also disclosed.