Heat exchanger

Abstract

A heat exchanger, which comprises a plurality of filler metal absorption means formed on both sides of each of porous smoothing tubes provided with both ends bonded to header pipes so as to prevent filler metal from flowing from the header pipes along scratches or die lines formed in the porous smoothing tubes and melting corrugated pins, thereby remarkably reducing failures generated by the melting of the pins, and having an improved external appearance compared to conventional heat exchangers having additional cutoff means.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a heat exchanger, and more particularly to a heat exchanger for vehicles that prevents filler metal, for bonding header pipes and porous smoothing tubes, from flowing from the header pipes along scratches or die lines formed in the porous smoothing tubes and melting corrugated pins, thereby improving efficiency in brazing. [0003] 2. Description of the Related Art [0004] Generally, a heat exchanger for vehicles, as shown in FIG. 1, comprises a plurality of porous smoothing tubes 2, obtained by extruding a material made of aluminum or aluminum alloy and arranged in parallel; a pair of header pipes 1 bonded to the porous smoothing tubes 2; and a plurality of corrugated pins 3 interposed between the porous smoothing tubes 2. [0005] Here, the header pipes 1 and the pins 3 are obtained by cladding the surfaces of base materials with filler metal. Since the filler metal has a melting point ...

AI Technical Summary

Benefits of technology

"The present invention provides a heat exchanger for vehicles that prevents filler metal from flowing along scratches or die lines formed in the porous smoothing tubes and melting corrugated pins. This is achieved by forming a plurality of filler metal absorption means on the porous smoothing tubes, which absorb molten filler metal and prevent it from leaking to the outside, to prevent pin-melting when the header pipes, the porous smoothing tubes, and the pins are bonded by brazing. The filler metal absorption means may be dented grooves formed in the external surfaces of the porous smoothing tubes, which have a depth of 5% to 10% of the wall thickness of the porous smoothing tubes. The number of the filler metal absorption means formed at one edge of one surface of each of the porous smoothing tubes may be from two to six, and the filler metal absorption means may be symmetrically formed at both surfaces."

Problems solved by technology

However, the above conventional method is disadvantageous in that the cutoff means mars the external appearance of the heat exchanger after the brazing process for bonding components is finished.

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