Brazed pipe and production method thereof

Abstract

A method of producing a brazed pipe including steps A-D. In step A, a first inclined surface (21) inclined downwardly from the above toward the right end is formed on the top surface of the right-side edge of a blank plate (20) having brazing filler metal layers on the opposite surfaces, and a first flat surface (22) is formed between the first inclined surface (21) and the bottom surface. In step B, a second inclined surface (24) inclined upwardly from the below toward the left end is formed on the bottom surface of the left-side edge of a blank plate (20), and a second flat surface (25) is formed between the second inclined surface (24) and the bottom surface. In step C, the blank plate (20) is formed in a tubular shape, and the both inclined surfaces (21, 24) are brought into surface-contact and the both flat surfaces (22, 25) are brought into contact to obtain a brazed pipe-use tubular body (34). In step D, the both inclined surfaces (21, 24) at the opposite-side edges of the blank plate (20) and the both flat surfaces (22, 25) are respectively brazed to each other by using the brazing filler metal layers of the blank plate (20). The above method can provide a brazed pipe free from step difference on the outer surface.

Description

technical field [0001] The present invention relates to a brazed pipe and its manufacturing method. More specifically, it relates to a brazed pipe suitable for use as a header in heat exchangers such as condensers and evaporators for in-vehicle air conditioners, and oil coolers for motor vehicles. Welded pipe and method for its manufacture. [0002] In this manual, the figure 1 Up and down, left and right are called up and down, left and right. In the description related to FIG. 7 , the up, down, and left and right in FIG. 7 are referred to as up, down, and left. In this specification, the term "aluminum" includes pure aluminum and aluminum alloys. Background technique [0003] As the heat exchanger 1 applied to, for example, a condenser of an interior air conditioner of a vehicle, the following heat exchangers are widely used. As shown in FIG. 7, the heat exchanger includes: a pair of aluminum water tanks 2, 3 extending in the vertical direction and spaced apart from ea...

AI Technical Summary

Problems solved by technology

Therefore, when there is a step difference on the outside of the cylindrical body 18 for brazing pipes, for example, when the inlet member 8 and the outlet member 9 are brazed to the cylindrical body 18 for brazing pipes, poor brazing will occur (see FIG. 9 ).

In order to prevent such a problem, it is necessary to prevent the two inclined surfaces 16, 17 from sliding against each other when obtaining the cylindrical body 18 for brazed pipe so that no step difference occurs outside the cylindrical body 18 for brazed pipe. operation, there is a problem that the manufacturing operation of the brazed pipe becomes complicated

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