Method for producing a heat exchanger having a flat tube and header pipes

Patent · Tue Jul 07 04:00:00 EDT 1987

OSTI ID:6030331

Koisuka, M; Aoki, H

This patent describes a method for producing a heat exchanger comprising a flat metal tube of an aluminum alloy for conveying fluid, and two header pipes joined respectively onto opposite ends of the flat tube, which comprises the steps of preparing the flat tube and the header pipes of an aluminum alloy other than a brazing filler metal, and preparing two brazing filler members of an aluminum alloy brazing filler metal. Each of the header pipes has an axial slot in a side wall for receiving an end of the flat tube. Each brazing filler member comprises an elongated plate portion arcuately curved transversely with a lengthwise elongated opening and with a flat sleeve portion projecting from an outer surface of the elongated plate portion overlying the elongated opening in registration. The sleeve portion has an inner surface congruent with the perimeter of the elongated opening, the sleeve portion inner surface and the elongated opening having an inner contour slightly larger than the outer contour of the flat tube; inserting each of opposite ends of the flat tube through both the sleeve portion and the elongated opening of a respective brazing filler member. It inserts each of the flat tube ends into a respective one of the header pipes through the axial slot while bringing the arcuately curved plate portions in contact with the outer surface of the corresponding header pipe. Brazing filler members are heated together with the header pipes and end portions of the flat tube to melt the brazing filler members. Header pipes are joined and brazed to the corresponding ends of the flat tube.

• Assignee: Sanden Corp., Gunma
• Patent Number(s): US 4678112
• OSTI ID: 6030331
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
ALLOYS
ALUMINIUM ALLOYS
BRAZING ALLOYS
CONSTRUCTION
FILLER METALS
HEAT EXCHANGERS
PIPES
SLEEVES
SURFACES
TUBES