Header pipe for heat exchanger and manufacturing apparatus and m

Details Header pipe for heat exchanger and manufacturing apparatus and m Header pipe for heat exchanger and manufacturing apparatus and m

1997-09-16

2000-04-25

Leo, Leonard

Heat exchange

Side-by-side tubular structures or tube sections

With manifold type header or header plate

165153, 165173, F28F 902

Patent

active

060532432

ABSTRACT:
When forming a circular tube-shaped header pipe by rolling a plate material, surfaces extending at a right angle to the internal and external surfaces of the plate material are formed at the two side edges extending in the lengthwise direction, and the plate material is rolled in such a manner that the two side edges face opposite each other while setting the two side edges in a non-contact state. In this process, the gap between the two side edges is set at or less than 0.3 mm. In order to manufacture this header pipe, a plate material that has been cut to a specific length is trimmed in the direction of its short side to achieve a specific dimension and also at a right angle to the front and rear surfaces of the plate material. After a piping insertion hole is formed, the entirety of the plate material is rolled so that its cross section achieves a U-shape. A plurality of tube insertion holes are formed in this state and then, with only an upper die and a lower die, the two side edges of the plate material are rolled in a circular tube shape so that they face opposite each other. Any level misalignment between the side edge portions that face opposite each other can be prevented, and defective brazing is eliminated.

REFERENCES:
patent: 4945635 (1990-08-01), Nobuse et al.
patent: 5243842 (1993-09-01), Kobayashi et al.
patent: 5341872 (1994-08-01), Mercurio
patent: 5351397 (1994-10-01), Angeli
patent: 5388329 (1995-02-01), Randlett et al.
patent: 5535819 (1996-07-01), Matsuura
patent: 5697433 (1997-12-01), Kato

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