Metal working – Means to assemble or disassemble – Heat exchanger
Patent
1995-06-16
1997-10-28
Cuda, Irene
Metal working
Means to assemble or disassemble
Heat exchanger
297265, 29890043, 29890047, B23P 1500
Patent
active
056806957
ABSTRACT:
An apparatus provides automatic lacing of hairpin tubes through the holes of a heat exchanger fin stack. This apparatus includes a plurality of identical extendable guide rods, each positioned in approximate alignment to engage an open end of a respective heat exchanger tube which is positioned adjacent to a respective fin stack hole. The plurality of guide rods are extended in unison through the holes of the heat exchanger fin stack to positions within the open ends of the hairpin tubes. Lead guides are located toward the end of each guide rod. The lead guides have forward and backward tapered surfaces extending from a central portion of maximum diameter. The lead guides ensure that the holes in the individual fins are moved into coaxial alignment with the guide rods as they travel through the fin stack. Once the guide rod ends are within the open ends of the hairpin tubes, self-aligning engagement fingers on each guide rod lead end expand to engage the internal diameter of a respective hairpin tube. The guide rods are then retracted in unison pulling the tubes through the fin stack holes. A self-regulating pressure mechanism assures that the pressure exerted by expanding fingers is within a predetermined range. Once the tubes have been laced, the engagement fingers are collapsed and the guide rods withdrawn from the tubes.
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Cuda Irene
Gore Gregory J.
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