Inspection method and inspection equipment of the corrugated fin, ventilation performance test methods and ventilation performance inspection equipment of the heat exchanger, and pressure resistance test method and pressure resistance testing apparatus of the heat exchanger

摘要

PROBLEM TO BE SOLVED: To provide a method for simply and accurately inspecting the pressure resistance performance of a heat exchanger.;SOLUTION: The method is used for inspecting the pressure resistance performance of the heat exchanger 1 in which a plurality of flat heat exchange pipes having an internal junction section are provided in parallel, and a corrugated fin is arranged the draft gap between adjacent heat exchange pipes. The inside of the heat exchanger 1 is pressurized. Light is emitted from one side of the draft direction of the heat exchanger 1 each before and after the pressurization. The same portion of the heat exchanger 1 is imaged by a CCD camera 43 from a plurality of directions at the opposite side in the same manner for obtaining a plurality of monochrome images of the same portion. Gray processing is performed to each monochrome image and each monochrome image is divided into a plurality of dots. The binarization of white and black portions is performed to luminance information at each dot by a prescribed threshold, and the number of black portions is counted. The pressure resistance of the heat exchanger 1 is determined from an increase in the number of the black portions after the pressurization to the number of black portions before the pressurization in each image.;COPYRIGHT: (C)2006,JPO&NCIPI