Single station tension hairpin tube expander

Details Single station tension hairpin tube expander Single station tension hairpin tube expander

1988-06-06

1989-08-22

Rosenbaum, Mark

Metal working

Means to assemble or disassemble

Heat exchanger

291573C, 291574, 29523, B23P 1526

Patent

active

048583057

ABSTRACT:
A single-station tube expander apparatus bells and expands the open ends of heat exchanger hairpin tubes in a plate-fin heat exchanger unit. A frame supports belling jaw fingers which close over and the open ends of the tubes so that a belling device can enter the tube ends to urge the tube outward into a profile surface formed in the mating faces of the fingers. Also on the frame are mounted expander jaw fingers which close over tube ends which have been belled previously, and hold the associated hairpin tubes against axial movement while expander rods pass into the associated tube legs to urge the hairpin tube legs outward to contact against the fin plates and tube sheets of the fin pack heat exchanger. The belling fingers and belling device move step by step from one tube to another, and the expander gripping fingers and expander rods follow the belling fingers and belling device.

REFERENCES:
patent: 1791887 (1931-02-01), Davies et al.
patent: 2016795 (1935-10-01), Belknap
patent: 2620013 (1952-12-01), De Voss
patent: 3119435 (1964-01-01), Greenman
patent: 4228573 (1980-10-01), Barnard
patent: 4584751 (1986-04-01), Gray et al.
patent: 4584765 (1986-04-01), Gray
patent: 4720902 (1988-01-01), Gray
patent: 4745678 (1988-05-01), Gray
patent: 4761866 (1988-08-01), Murphy
patent: 4766667 (1988-08-01), Gray

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