Flat tube heat exchanger, method of making the same and flat tubes for the heat exchanger
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United States of America Patent
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Oct 12, 1993
Grant Date -
N/A
app pub date -
Jun 22, 1992
filing date -
Jun 20, 1991
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A flat tube heat exchanger includes headers (4) and a number of flat tubes (12) between the headers (4), the flat tubes (12) having flat sides (14) and short sides (50) that are rounded. The flat tubes (12) also have internal reinforcing ribs (42). The heat exchanger also includes zigzag fins disposed between the flat sides (14) of the flat tubes (12), the fins being soldered to the flat tubes. The longitudinal extent (1) of a rounded short side (50) of a flat tube (12) is greater than half the distance d between the flat sides (14) of the flat tube (12). Furthermore, the zigzag fins (16) are soldered to portions (58) of both rounded short sides (50) of the flat tube (12). In the process for producing the flat tube heat exchanger (12), the ends of the flat tubes (12) are inserted into slits (8) of a header (4) and are cut free from their reinforcement ribs (42). The ends of the flat tubes (12) are then expanded against the rims of the slits (8) in the header (4). The heat exchanger can be used as a condenser in a vehicle air conditioner, or as a cooler for an engine or transmission or hydraulic oil in a motor vehicle. Flat tubes for installation in the flat tube heat exchanger can be linked together when they are made to facilitate transportation and handling.
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