Back to results
US 4,495,989 AGranted
Multiple coil heat exchanger
AssigneeSpiral Tubing Corporation
InventorRichard W. Sievers
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSpiral Tubing Corporation
InventorRichard W. Sievers
Estimating the term…
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 continuous 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 a 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.
A heat exchanger comprising a multiple coil structure having a common axis and formed from a continuous tube having inlet and outlet ends, said structure including an inner coil formed of said tube beginning from said inlet end and having a plurality of abutting and substantially identical turns coiled about and spaced along said common axis to the other end of said structure, an outer coil formed of said tube and having a plurality of abutting and substantially identical turns coiled concentrically and substantially coextensive with said inner coil and spaced along said common axis toward said inlet end, and a continuous transition segment joining said inner and said outer coils at said other end of said structure and having a first curved portion substantially parallel to said inner coil radially extending said tube relative to said inner coil and a second curved portion substantially parallel to said outer coil which extends over said inner coil.
A heat exchanger comprising a multiple coil structure formed from a continuous coiled tube having a common axis and inlet and outlet ends substantially disposed in a common plane at one end thereof, said structure including an inner coil formed of said tube beginning in said common plane and having a plurality of inner turns coiled about and spaced along said common axis to the other end of said structure at a first pitch angle, an outer coil formed of said tube and having a plurality of outer turns coiled over and substantially coextensive with said inner coil and spaced along said common axis extending to said common plane at a second pitch angle which is opposite to said first pitch angle, and a continuous transition segment joining said inner and said outer coils at said other end of said structure and having a pitch which transitions from said first pitch angle to said secoond pitch angle.
A multiple coil heat exchanger comprising a coiled tube formed with an inner coil having a plurality of contiguous turns coiled about a common axis in a spiral arrangement having a pitch in one direction and an outer coil having a plurality of contiguous turns coiled concentrically about said inner coil along said common axis in a spiral arrangement having a pitch in the opposite direction, and a continuous transition segment formed from said tube joining said inner and outer coils at one end thereof, said transition segment including a first curved portion of increasing radius of curvature substantially parallel to said inner coil to radially extend said tube relative to said inner coil and a second curved portion substantially parallel to said outer coil for axially extending said tube over said inner coil in forming said outer coil.
Dependencies are inferred from the claim text.