METHOD OF MAKING COILS OF FINNED TUBES Russian patent published in 1997 - IPC

Abstract RU 2087236 C1

FIELD: plastic metal working, namely manufacture of helical coils of heat exchangers. SUBSTANCE: method comprises steps of U-bending finned tube and forming its different-length branches; bending up end portions of said tube branches by angle (90-(90-γ)°) degrees, where γ - lead angle of helical line of coiling; securing bent up ends to mandrel and coiling tube onto mandrel. Length difference of branches of U-shaped finned tube is equal to half of length of mandrel circle. Before and after U-bending operation finned tube is annealed. EFFECT: enhanced efficiency. 10 dwg

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RU 2 087 236 C1

Authors

Chernov N.S.

Kachalov V.A.

Ovchinnikov A.I.

Zubkov N.N.

Dates

1997-08-20Published

1994-05-06Filed