PLATE FIN FOR HEAT EXCHANGER AND PLATE FIN TUBE TYPE HEAT EXCHANGER

摘要

PURPOSE: To improve coil heat transmissivity by a method wherein a lance having a sine-waveform and raised to the peak and the trough of the sine- waveform adjoining to a train of a tube is provided, and a plate fin having no surface raised part is assembled in the position of the trough between the trains of the tubes. CONSTITUTION: The section of a plate fin 12 forms two sine-waveforms along a surface line 50 of a fin 12 and elongated lances 36 and 38 are raised upward along the surface line 50 based on an original surface. The lances 36 and 38 are formed only at the maximum value part (peak) and the minimum value part (trough) of the sine-waveform, and formed only on both sides of a hole 16 for a tube. Since the raised lances are not present in the trough 36, a plurality of trains fins are cut into single trains of the fins and the leading edge and the trailing edge of the fin after cutting contain no raised lance. In the single train of the fins, the leading edge and the trailing edge are not brittle and hardly deformed. The raised lances 36 and 38 increase capacity of the plate fin 12 to absorb or dissipate heat when occasion demands.