Header pipes for heat exchanger
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United States of America Patent
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-
Feb 9, 1999
Grant Date -
N/A
app pub date -
Dec 30, 1997
filing date -
Jan 14, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The header pipes 3 and 4 of a heat exchanger 1, wherein each of the header pipes is provided with a plurality of tube insertion holes 9 in a longitudinal direction; the ends of tubes 2 are inserted into the tube insertion holes; the extended portions 3a and 4a respectively include longitudinally extended portions respectively extending from the portion provided with the tube insertion holes; further, the extended portions are provided with the reinforcing beads 13 respectively. The beads 13, each having a width equal to the opening width of each of the tube insertion holes 9, are pitched substantially equally as the tube insertion holes. Further, the header pipes 3 and 4 are formed by shaping a flat-sheet header pipe material H into pipes having a predetermined diameter.
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