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US 5,172,762 AGranted
Heat exchanger
AssigneeSanden Corporation
InventorsToshiharu Shinmura, Nobuyasu Ando, Hisao Aoki, Naoyoshi Sutou
Life of this patent
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AssigneeSanden Corporation
InventorsToshiharu Shinmura, Nobuyasu Ando, Hisao Aoki, Naoyoshi Sutou
Estimating the term…
A heat exchanger includes a pair of header pipes, tubes disposed between the header pipes, and radiation fins provided along the tubes. Each of the header pipes has a plurality of connection holes for the tubes. Each of the header pipes is formed by bending a longitudinal flat plate in the form of a pipe and connecting the side edge portions of the bent plate to each other. The side edge portions of the bent longitudinal plate have connecting portions which are connected to each other with a junction area larger than the cross-sectional area defined by the thickness and length of each header pipe at a position other than the side edge portions. The connection holes are processed before the longitudinal flat plate is bent, and therefore, can be easily and precisely formed at desired positions. The manufacture of the heat exchanger can be simplified and the cost for the manufacture can be reduced. The connection strength of the side edge portions can be increased by the larger connection area of the connecting portions. The strength of the header pipe can be maintained over a long period of time.
A heat exchanger comprising:
A heat exchanger including at least one tubular header pipe formed from a rectangular plate having a pair of parallel opposed side edge portions which are joined together and at least one slot with sides for attachment of a heat exchange tube, at least one heat exchange tube being connected with said header pipe in fluid communication for effecting the flow of a heat exchange medium through said heat exchanger, and a plurality of fin units provided along the outside of said heat exchange tube, the improvement comprising said rectangular plate comprising a single bent rectangular plate including one opposed side edge portion having an extended folded portion which interlocks with and retains the other opposed side edge portion to form said tubular header pipe, wherein said slot of said bent rectangular plate is shaped and sized to engage and press into said heat exchange tube to hold it in place.
Dependencies are inferred from the claim text.