F - Mech Eng,Light,Heat,Weapons – 28 – F
Patent
F - Mech Eng,Light,Heat,Weapons
28
F
26/145, 257/26
F28F 1/00 (2006.01) B21D 11/06 (2006.01) B21D 53/06 (2006.01) F28D 7/08 (2006.01)
Patent
CA 1146160
MULTIPLE COIL HEAT EXCHANGER ABSTRACT A compact multiple coil heat exchanger having a high heat transfer density is provided to include at least an inner coil formed from a continuous tube into a plurality of contiguous turns about a common axis in a spiral arrangement and having a pitch in one direction and an outer coil formed from the con- tinuous tube into a plurality of overlapping turns concentrically about the inner coil in a spiral arrangement having an opposite pitch. Further, a coil-forming apparatus and continuous coil- forming method is directed to form a multiple coil heat exchanger from a continuous tube using a coil-forming die rotatably mounted on d support frame. The coil-forming die includes a continuous spiral thread constructed to receive and laterally support the continuous tube while fabricating the multiple coil heat exchanger according to the continuous coil-forming method of this invention. The thread of the coil-forming die terminates at one end thereof at a coil-reversing plate having a first portion which spirals outward to a radial position above the thread and a second portion which axially extends towards the opposite end of the coil- forming die to form a one-piece multiple coil heat exchanger.
362221
R. William Wray & Associates
Spiral Tubing Corp.
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