US3880232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-material heat exchanger construction
Assignee: Garrett Corp
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Filing: 1973-07-25
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Granted: 1975-04-29
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Expires: 1993-07-25
Abstract
Abstract A recuperative heat exchanger in which the material composition of the fins and plates varies in the flow direction of the higher temperature fluid according to the designed temperature and stress conditions. A first plate of high stress- and heatresistance quality material is welded edgewise to a second plate of lower stress- and heat-resistance quality material which in turn may be edge-welded to another plate of still lesser quality material. The resulting multi-material plate is then rolled to a desired thickness and formed to provide the particular heat exchanger element. A plurality of such elements, formed as plates and fins for example, are then fabricated into a unitary heat exchanger core and arranged in a position whereby the portions of the elements having the high stress- and heat-resistance qualities are at the higher temperature end of the heat exchanger.
Inventors
- 👤 Kenneth O Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:32
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0062; F28F; F28F13/00; F28F13/14; F28F21/00; F28F2250/00; F28F2250/10; F28F2250/104; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/359; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49357; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12944; Y10T428/12951; Y10T428/12972
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
184 words
A heat exchanger core of the counterflow fluid type wherein one of the fluids is introduced to and removed from the core in a direction orthogonal to the direction of fluid flow through the core, comprising: a plurality of stacked plates formed to define layered passages for fluid streams flowing between opposite ends of the core, adjacent pairs of said streams being arranged to flow in opposed directions, one of said pair of streams comprising a hot gas and the other being a fluid entering the core at a cooler temperature; each of said plates comprising sections of different materials having different stress- and heat-resistance qualities, said sections being edge-welded together along juncture lines between adjacent sections, the sections and welded edges extending transversely to the direction of fluid flow through the core; said plates being disposed within the heat exchanger such that the sections of highest stress- and heat-resistance qualities are located adjacent the hot gas inlet end of the heat exchanger core and the sections of lowest stress- and heatresistance qualities are located adjacent the inlet end of the cooler temperature fluid.
Claim 2
Dependent Claim
184 words
A heat exchanger core of the counterflow fluid type wherein one of the fluids is introduced to and removed from the core in a direction orthogonal to the direction of fluid flow through the core, comprising: a plurality of stacked plates formed to define layered passages for fluid streams flowing between opposite ends of the core, adjacent pairs of said streams being arranged to flow in opposed directions, one of said pair of streams comprising a hot gas and the other being a fluid entering the core at a cooler temperature; each of said plates comprising sections of different materials having different stress- and heat-resistance qualities, said sections being edge-welded together along juncture lines between adjacent sections, the sections and welded edges extending transversely to the direction of fluid flow through the core; said plates being disposed within the heat exchanger such that the sections of highest stress- and heat-resistance qualities are located adjacent the hot gas inlet end of the heat exchanger core and the sections of lowest stress- and heatresistance qualities are located adjacent the inlet end of the cooler temperature fluid.
Claim 3
Dependent Claim
26 words
A heat exchanger core in accordance with claim 1 further comprising a plurality of finned elements individually arrayed between adjacent pairs of plates defining said passages.
Claim 4
Dependent Claim
58 words
A heat exchanger core in accordance with claim 2 wherein said finned elements comprise sections of different materials respectively corresponding in stress-and heat-resistance qualities to adjacent plate sections, the different finned element sections extending transversely to the direction of fluid flow through the core and generally coextensively with the adjacent plate sections of corresponding stress- and heat-resistance qualities.
Claim 5
Dependent Claim
22 words
A heat exchanger core in accordance with claim 3 wherein said finned elements adjacent sections are edge-welded together to form integral units.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |