US 2009/0255656 A1 · Brazed Pipe and Method of Manufacturing the Same

Abstract

A method of manufacturing a brazed pipe comprises steps A to D. In the step A, on an upper surface of the right-hand side edge portion of a material plate 20 having a brazing material layer over opposite surfaces thereof, a first slant surface 21 is formed such that it inclines from the upper side toward the lower side while approaching the right end, and a first flat surface 22 is formed between the first slant surface 21 and the lower surface. In the step B, on a lower surface of the left-hand side edge portion of the material plate 20, a second slant surface 24 is formed such that it inclines from the lower side toward the upper side while approaching the left end, and a second flat surface 25 is formed between the second slant surface 24 and the lower surface. In the step C, the material plate 20 is formed into a tubular shape such that the slant surfaces 21 and 24 are in surface contact with each other, and the flat surfaces 22 and 25 abut against each other, whereby a brazed-pipe tubular body 34 is obtained. In the step D, the slant surfaces 21 and 24 and the flat surfaces 22 and 25 of the opposite side edge portions of the material plate 20 are respectively brazed together by making use of the brazing material layer of the material plate 20. According to the method of the present invention, a brazed pipe which has no step on the outer surface can be provided.

Claims21

Dependent claims

A brazed pipe fabricated through a process in which a material plate formed of a brazing sheet having a brazing material layer over each of opposite surfaces thereof is formed into a tubular shape, and opposite side edge portions of the material plate are partially overlapped with each other and brazed together by making use of the brazing material layer of the material palate, wherein
of the opposite side edge portions of the material plate overlapped with each other, a first side edge portion located on the inner side has a first slant surface which is formed on the outer surface thereof such that the first slant surface inclines inward toward a distal end of the first side edge portion;
a second side edge portion located on the outer side has a second slant surface which is formed on the inner surface thereof such that the second slant surface inclines outward toward a distal end of the second side edge portion;
a first flat surface is formed between the first slant surface and the inner surface of the first side edge portion such that the first flat surface forms an obtuse angle in relation to the first slant surface;
a second flat surface is formed between the second slant surface and the inner surface of the second side edge portion such that the second flat surface forms an obtuse angle in relation to the second slant surface and the first flat surface abuts against the second flat surface;
and the opposite side edge portions of the material plate are brazed together in a state where the first and second slant surfaces are in surface contact with each other and the first and second flat surfaces are in surface contact with each other.

3 more elements

A method of manufacturing a brazed pipe, comprising:

a step A of forming, on one side edge portion of a material plate formed of a brazing sheet having a brazing material layer over each of opposite surfaces thereof, a first slant surface such that the first slant surface is located on a first face of the material plate and inclines from the first face toward a second face of the material plate while approaching a distal end of the one side edge portion, and forming a first flat surface between the first slant surface and the second face such that the first flat surface forms an obtuse angle in relation to the first slant surface;
a step B of forming, on the other side edge portion of the material plate, a second slant surface such that the second slant surface is located on the second face of the material plate and inclines from the second face toward the first face of the material plate while approaching a distal end of the other side edge portion, and forming a second flat surface between the second slant surface and the second face such that the second flat surface forms an obtuse angle in relation to the second slant surface;
a step C of forming the material plate into a tubular shape such that the first face thereof is located on the outer side such that the first and second slant surfaces of the opposite side edge portions are in surface contact with each other and the first and second flat surfaces of the opposite side edge portions abut against each other, to thereby obtain a brazed-pipe tubular body;
and
a step D of brazing together the first and second slant surfaces and the first and second flat surfaces, respectively, of the opposite side edge portions of the material plate, which forms the brazed-pipe tubular body, by making use of the brazing material layer of the material plate,
wherein, after one of the steps A and B is performed, the remaining one of the steps A and B is performed, and then the steps C and D are performed in this sequence.

3 more elements

Dependencies are inferred from the claim text.

Brazed Pipe and Method of Manufacturing the Same

Life of this patent

Brazed Pipe and Method of Manufacturing the Same

Life of this patent

Abstract

Claims21