Apparatus for making a tube and fin heat exchanger

专利名称：Apparatus for making a tube and fin heat

exchanger

发明人：Steven L. Stroup申请号：US07/052689申请日：19870520公开号：US04780955A公开日：19881101

摘要：An improved tube and fin heat exchanger and a method and apparatus formaking the same is disclosed. The head exchanger includes spaced end sheets and astack of plate fins positioned therebetween. Hairpin tubes extend through the end platesand the stack of fins. The tubes are initially sized to loosely fit through the end sheetsand fins and are expanded into tight heat exchange engagement therewith duringmanufacture. The end sheets are accurately positioned a fixed distance apart by amethod and apparatus in which the end sheets are held a fixed distance apart during theexpansion of the tubes. The bent ends of the hairpin tubes are moved upwardly throughthe adjacent end sheet and the fins ahead of the expansion bullets to compensate for theshortening of the tubes created by the expansion operation. In one embodiment, pistonand cylinder actuators supply a force on the bent ends of the tubes which substantiallybalances the axial force produced by the expansion bullets and prevents distortion of theremove end sheet. In a second embodiment, a mechanical drive is provided to move thebent ends of the hairpins in response to movement of the slide which carries theexpansion bullets.

申请人：CROWN UNLIMITED MACHINE, INC.

代理机构：Pearne, Gordon, McCoy & Granger

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