Heat exchanging fin and method of manufacturing the same
OwnerMamoru Yamadainventor
Life of this patent
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Abstract
An object of the present invention is to provide a heat exchanging fin capable of preventing cracks from forming in the flares of the collared tube holes, even if the metallic plate section is made of the thin and tough material. In the heat exchanging fin, a metallic plate section has a plurality of tube holes. A plurality of collars are respectively extended from edges of the tube holes. A plurality of flares are respectively formed at front ends of the collars. Each flare includes a plurality of radially extended sections, which are radially outwardly extended from the front end of each collar, and separation between the metallic plate section and each radially extended section is fixed.
Claims20
A heat exchanging fin,
- comprising:
- a metallic plate section having a plurality of tube holes;
- a plurality of collars each of which is extended from an edge of each tube hole;
- and
- a plurality of flares each of which is formed at a front end of each collar,
- wherein each flare includes a plurality of radially extended sections, which are radially outwardly extended from the front end of each collar, and separation between said metallic plate section and each radially extended section is fixed.
A method of manufacturing a heat exchanging fin including:
- a metallic plate section having a plurality of tube holes;
- a plurality of collars each of which is extended from an edge of each tube hole;
- a plurality of flares having prescribed height, each flare being formed at a front end of each collar,
- comprising the steps of:
- forming a cylindrical section, in which higher sections and lower sections are alternately formed at a front end, along the edge of each tube hole;
- and
- forming the flare of each collar by radially outwardly bending the higher sections of said cylindrical section.
Dependencies are inferred from the claim text.