US3815672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split fin heat exchange unit
Assignee: MERCANTILE TEXAS CREDIT Corp
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Filing: 1972-11-17
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Granted: 1974-06-11
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Expires: 1992-11-17
Abstract
Abstract A heat exchange unit comprises a series of parallel tubular finned leg portions connected with U-shaped bends to form a continuous path for the circulation of a heat exchange fluid. The unit is formed of two joined sections, each of which is provided with an offset portion. In the construction of the unit, hairpin tubing is employed in each section; however, straight tubes extend through at least the longitudinally aligned offset portion of each section. The method of constructing the unit comprises expanding the hairpin tubes of each section into heat conducting engagement with the fins thereon by a single stroke multi-tube expander device, juxtapositioning both sections in side-by-side relationship, inserting the straight tubes through at least the offset portions of the sections, separately expanding the straight tubes into heat conducting engagement with the fins thereon, and providing return bends on the open ends of the straight tubes and on selected open ends of the hairpin tubing to provide the desired circulation path for the heat exchange fluid.
Inventors
- 👤 R Bullard
- 👤 R Lloyd
- 👤 D Zipser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:39
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B21D53/085; F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/495; Y10S165/497; Y10S165/498; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/4938
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
213 words
In a heat exchange unit comprising a coil of thermallyconductive tubing adapted to permit the continuous passage therethrough of a heat exchange fluid, said coil being formed by a plurality of parallel and substantially planar straight portions and end loops connecting said parallel portions to form a continuous tube circuit and in which said tubing has been expanded into heat conducting engagement with thermally conductive fins carried thereon, the improvement comprising a first section which includes hairpin tubing extending between and mounted in a first pair of end plates, a portion of said fins closer to one of said end plates than the other having a greater width than that of the remaining fins whereby a first offset portion is formed, a second section which includes hairpin tubing extending between and mounted in a second pair of end plates, a portion of said fins closer to one end plate of said second pair than the other having a greater width than that of the remaining fins in said second section whereby a second offset portion is formed, and a plurality of single straight tubes mounted in said end plates of the first and second pairs extending through and carrying at least those portions of said fins within said first and second offset portions.
Claim 2
Dependent Claim
213 words
In a heat exchange unit comprising a coil of thermallyconductive tubing adapted to permit the continuous passage therethrough of a heat exchange fluid, said coil being formed by a plurality of parallel and substantially planar straight portions and end loops connecting said parallel portions to form a continuous tube circuit and in which said tubing has been expanded into heat conducting engagement with thermally conductive fins carried thereon, the improvement comprising a first section which includes hairpin tubing extending between and mounted in a first pair of end plates, a portion of said fins closer to one of said end plates than the other having a greater width than that of the remaining fins whereby a first offset portion is formed, a second section which includes hairpin tubing extending between and mounted in a second pair of end plates, a portion of said fins closer to one end plate of said second pair than the other having a greater width than that of the remaining fins in said second section whereby a second offset portion is formed, and a plurality of single straight tubes mounted in said end plates of the first and second pairs extending through and carrying at least those portions of said fins within said first and second offset portions.
Claim 3
Dependent Claim
27 words
A heat exchange unit according to claim 1, wherein the width of the fins within the offset portions of said first and second sections are substantially equal.
Claim 4
Dependent Claim
33 words
A heat exchange unit according to claim 1, wherein the combined width of said first and second sections renders the unit too wide for use with standard single stroke multi-core tube expander devices.
Claim 5
Dependent Claim
46 words
A heat exchange unit according to claim 1, wherein the said straight tubes and selected open ends of said hairpin tubing are provided with return bends and are interconnected so as to permit continuous passage of said heat exchange fluid therethrough in the desired circulation path.
Claim 6
Dependent Claim
71 words
A heat exchange unit according to claim 1, wherein one of the end plates of each said pair extends beyond the edge of the fins arranged closest thereto and the other end plate of each pair terminates short of the edge of the fins arranged closest thereto to provide for an overlapping end plate construction, apertures being provided in said extended portions of said end plates and straight tubes extending therethrough.
References Cited (Backward Citations)
US2437452A
Cited
US3030782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |