Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Reexamination Certificate
2008-06-13
2011-10-11
Afzali, Sarang (Department: 3726)
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
C029S890040, C029S890044, C029S890054, C165S177000, C165S178000, C165S181000, C228S164000, C228S183000
Reexamination Certificate
active
08033018
ABSTRACT:
According to a preferred embodiment, an improved method and apparatus for manufacturing tube and fin heat exchangers that includes a step for reducing the outer diameter of stock tubing to a value well below nominal prior to bending the tubing into hairpins. The reduced diameter increases the stiffness of the resultant hairpins and allows for efficient lacing of the heat exchanger fins and end plates. The method uses pre-size rollers that are adjustable for reducing the diameter of the tubing. The invention also includes a hairpin and heat exchanger manufactured according to the method.
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Dees Dan
Garza Eric
Merschat Stephen
Mosser Sean
Overturff Andrew
Afzali Sarang
Andrews & Kurth LLP
Cooke Brett T.
Goodman Global, Inc.
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