John Jahoda DeceasedMc Minnville, TN

4197625, Apr 15, 1980

Feb 15, 1978

5/878059

John Jahoda - McMinnville TN

Carrier Corporation - Syracuse NY

B23P 1526

291573V

A method of assembling a plate fin coil by making sheets of single pass single row plate fins from plate fin stock. The fins within each sheet are connected by tabular portions and have openings for the receipt of hairpin tubes which form part of the flow circuitry of the heat exchanger. A plurality of sheets are arranged in registration so that hairpin tubes may be inserted through the openings within the fins to form partially assembled heat exchanger coil cores. The adjacent coil cores may be separated at this point by rupturing the tabular portions connecting the fins within the various sheets or additional process steps may be completed simultaneously upon the entire coil bundle having many coil cores. At some time in the plate fin coil assembly process the rows of plate fins are separated into single or multi-row coils by rupturing the tabular portions to form the appropriate row size coil core. A coil bundle formed by partially assembling coil cores having sheets of connected fins is also disclosed.

4173998, Nov 13, 1979

Feb 16, 1978

5/878195

John Jahoda - McMinnville TN

Carrier Corporation - Syracuse NY

B23P 1526

165182

Apparatus and a method of manufacturing a formed coil having multiple single row coil cores of varying lengths. Sheets of fins are cut from plate fin stock such that the fins within each sheet are connected to each other by rupturable tabular portions. The sheets of fins are then arranged in registration such that openings within the fins for the receipt of tubes are aligned and tubular members or hairpins may be inserted within the fins to form part of the fluid flow circuit of the coil. Since the hairpins for adjacent coil rows are of different lengths, when the multiple row coil core is bent each coil row is formed about a separate radius curvature so that the formed coil will be in the desired configuration. Prior to bending, the hairpins are expanded to form a heat transfer bond with the fins, the expansion process acting to rupture the tabular portions connecting the fins such that the fins on the hairpins become separately spaced along each hairpin. Thereafter the coil core is bent to the desired formed coil configuration wherein the fins are spaced distinctly along each coil row notwithstanding that the fins were originally from the same sheet and connected to each other by the tabular portions.