US3601185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger construction
Assignee: RTX Corp
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Filing: 1969-11-04
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Granted: 1971-08-24
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Expires: 1989-11-04
Abstract
Abstract A heat exchanger construction for maximum thermal fatigue life having C-shaped closure bars on the cool fluid side, the C-shaped closure bars being made from a material having a lower coefficient of thermal expansion than the remainder of the core, and having cooling fins therein and having hot fluid fins cut back from the inlet face of the core to reduce the heat input to the closure bars.
Inventors
- 👤 Edward A Rothman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:12
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; F28F3/025; F28D; F28D9/00; F28D9/0062; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/387; Y10S165/39
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
In combination with a plate-fin heat exchanger core construction for long tHermal fatigue life of the type where superposed stacked plate and fin elements are adapted to form a crossflow arrangement with the plate elements and the fin elements disposed therein defining flow paths, the improvement comprising: C-shaped closure bars having a pair of parallel legs contiguous with and separating said plates on the cool fluid side of the heat exchanger and said legs being progressively wider from the center of the core to the top and bottom of the core so as to progressively extend the transition between the closure bars and the plates; and said fins on the hot fluid side of said heat exchanger being cut back from the inlet face of the heat exchanger core thereby reducing the heat input to the closure bars.
Claim 2
Dependent Claim
138 words
In combination with a plate-fin heat exchanger core construction for long tHermal fatigue life of the type where superposed stacked plate and fin elements are adapted to form a crossflow arrangement with the plate elements and the fin elements disposed therein defining flow paths, the improvement comprising: C-shaped closure bars having a pair of parallel legs contiguous with and separating said plates on the cool fluid side of the heat exchanger and said legs being progressively wider from the center of the core to the top and bottom of the core so as to progressively extend the transition between the closure bars and the plates; and said fins on the hot fluid side of said heat exchanger being cut back from the inlet face of the heat exchanger core thereby reducing the heat input to the closure bars.
Claim 3
Dependent Claim
33 words
A heat exchanger core construction as recited in claim 1 wherein said C-shaped closure bars are constructed of a material having a lower thermal expansion coefficient than the remainder of the core materials.
Claim 4
Dependent Claim
28 words
A heat exchanger core construction as recited in claim 1 wherein cooling fins are disposed within at least the first C-shaped closure bar in from the end plates.
Claim 5
Dependent Claim
179 words
In combination with a plate-fin heat exchanger core construction for long thermal fatigue life of the type where superposed stacked plate and fin elements are adapted to form a crossflow arrangement with the plate elements defining flow paths and the fin elements disposed therein, the improvement comprising: C-shaped closure bars separating said plates on the cool fluid side of the heat exchanger for extending the transition between the closure bars and plates, said C-shaped closure bars being constructed of a material having a lower thermal expansion coefficient than the remainder of the core materials and being disposed between the plates in a graduated sequence, being wider near the end sheets and gradually decreasing in width towards the center of the heat exchanger core; cooling fins disposed within at least the first C-shaped closure bar in from the end plates and absent from the other C-shaped closure bar; and said fins on the hot fluid side of said heat exchanger core being cut back from the inlet face of the core, thereby reducing the heat input to the closure bars.
Claim 6
Dependent Claim
179 words
In combination with a plate-fin heat exchanger core construction for long thermal fatigue life of the type where superposed stacked plate and fin elements are adapted to form a crossflow arrangement with the plate elements defining flow paths and the fin elements disposed therein, the improvement comprising: C-shaped closure bars separating said plates on the cool fluid side of the heat exchanger for extending the transition between the closure bars and plates, said C-shaped closure bars being constructed of a material having a lower thermal expansion coefficient than the remainder of the core materials and being disposed between the plates in a graduated sequence, being wider near the end sheets and gradually decreasing in width towards the center of the heat exchanger core; cooling fins disposed within at least the first C-shaped closure bar in from the end plates and absent from the other C-shaped closure bar; and said fins on the hot fluid side of said heat exchanger core being cut back from the inlet face of the core, thereby reducing the heat input to the closure bars.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |