Patent ID: 6662858
Filing Date: 2003-12-16
Classification: F28F

Abstract:
A heat exchanger, comprising:a metal external plate; and at least one metal base plate, said at least one metal base plate and said external being piled up, having at least one elongated ridge with two ends, and a projecting connecting tube being located at said two ends respectively with an upper end thereof having through holes; wherein every two neighboring base plates are disposed to be revered to each other, with said ridges thereof forming horizontal tubes and said connecting tubes and said grooves thereof connecting with each other in series to form vertical tubes, and said external plate is placed on an uppermost base plate to close said through holes; wherein each of said base plates has at least one depression with a bottom surface and at least one projection with a top surface, said at least one ridge being placed in said at least one depression and said connecting tube at said ends of said at least one ridge and said top surface of said at least one projection having equal heights, said at least one projection has a groove and two ends of the groove has a connecting tube with through holes, and said connecting tubes of said groove and said bottom surface of said at least one depression having equal heights.