Patent ID: 6470964
Filing Date: 2002-10-29
Classification: F28D,F28F

Abstract:
A heat exchanger comprising:a tube body having first and second wall portions which oppose each other forming an interior defining a fluid flow passage for flow of a fluid therethrough, each of said first and second wall portions having inner and outer surfaces defining heat entrance and exit surfaces of the fluid; a plurality of bulging wall portions formed in said first wall portion of said tube body, each of said plurality of bulging wall portions have a curved cylindrical side wall portion beginning at an intersection thereof with said first wall portion and tapering in diameter to a flat leading end; a plurality of triangular-shaped cross-section protrusion members protruding inwardly into said interior of said tube body from portions of said inner surfaces of said first and second wall portions, each of said plurality of triangular-shaped cross-section protrusion members extending linearly in a direction of a length of said tube body, each of said plurality of triangular-shaped cross-section protrusion members on said portions of said inner surfaces of said first wall portion being located at least on said flat leading ends of each of said plurality of bulging wall portions, and each of said plurality of triangular-shaped cross-section protrusion members being immediately adjacent to another one of said plurality of triangular-shaped cross-section protrusion members, but separated therefrom by each of a plurality of triangular-shaped cross-section recesses; wherein each of said plurality of bulging wall portions formed in said first wall portion have said flat leading end thereof extending toward a direction of said second wall portion so that each of said plurality of triangular-shaped cross-section protrusion members on at least said inner surfaces of said flat leading ends of each of said plurality of bulging wall portions matingly fit and are fixedly connected to each of said plurality of triangular-shaped cross-section recesses on said inner surface of said second wall portion, thereby providing more surface area for a better fit and stronger connection of said flat leading end portions of each of said plurality of bowl-shaped bulging wall portions.