| 摘要 |
<p>An improved heat exchange tubing and blade assembly and a method for fabricating the same is described. The heat exchange assembly comprises on elongated tube and on elongated heat exchange blade strip positioned thereon. The heat exchange strip includes an array of integrally formed blade segments which extend from a U-shaped support segment of the strip. Surfaces of the blades extend at a favorable angle of attack to the incident fluid flow stream, and in a preferred embodiment the chords of the blades extend in a direction substantially normal to a longitudenal axis of the tube. The strip is supported on an outer surface of the tube, and a means integrally formed with the tube maintain the support segment in thermal contact with the tube. In a presently prefered embodiment, the tube has a generally streamlined oval cross section for utilization in heat exchanger apparatus such as in an air conditioner, refrigerator or heat pump, with the tubing arranged such that the minor axis of the oval extends perpendicular to the external fluid flow and its major axis extends parallel therewith for reducing the frictional drag and reducing stagnant regions of the external fluid flow. The multiple blades fan out from opposite sides of the oval tubing along its two gently curving arcuate faces where the fluid flow is relatively fan out from opposite sides of the oval tubing along its two gently curving arcuate faces where the fluid flow is relatively unimpeded. Moreover, the individual blades in a preferred embodiment are tapered so as to decrease in thickness from root to tip, thereby reducing the mass and weight of thermally conductive material in the blade strips while providing suitable thermal conduction and mechanical strength in the individual blades.</p> |
