| 摘要 |
PURPOSE:To provide a heat exchanger in which the workability and heat transfer characteristic of heat transfer fins are improved and which is efficient by forming trapezoidal flat portions between rows in the air flowing direction as cut portions in the stage direction of fins, on the centerline in the trapezoidal height direction. CONSTITUTION:Each of heat transfer fins 1 has a plurality of through holes 13, and each pipe 2 penetrates a plurality of heat transfer fins 1. The fins 1 are delivered in the stage direction, and barring portions 10, through holes 13 and the tranpezoidal shape are formed. Thereafter, the fine 1 are cut on he flat portions 3, 4a and 4b positioned on the centerline in the height direction of the trapezoidal form by means of upper and lower cutters 5a and 5b in accordance with the necessary number of rows, and then are cut in a predetermined stage dimension. Thus, the fin cut portions are always made constant, and hence the working precision of the cut portion 8 can be maintained and fine splits (cutting irregularity) can be prevented from occurring.
|
