US5042574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finned assembly for heat exchangers
Assignee: Modine Manufacturing Co
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Filing: 1990-07-26
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Granted: 1991-08-27
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Expires: 2010-07-26
Abstract
Abstract Potential difficulties with corrosion in heat exchangers utilizing aluminum fins are avoided by using fin and tube constructions made by a method which includes the steps of providing a flattened tube (50) of ferrous material (80) and having an exterior coating (82) predominantly of aluminum; providing at least one serpentine fin (56) of aluminum (86) and clad with a predominantly aluminum braze cladding (88); assembling (102) the fin (56) to the flattened tube (50); applying (94), (100), (104), brazing flux to at least one of the fin (56) and the tube (50); raising (106) the temperature of the assembly to a level sufficient to at least partially melt the braze cladding (88); and maintaining the temperature for a sufficient period of time to achieve a brazed joint (60) between the fin (56) and the tube (50) but a time insufficient to convert the coating (82) and the cladding (88) to ferrous-aluminum intermetallic compound or intermediate phase.
Inventors
- 👤 Andrew J. Cottone
- 👤 Zalman P. Saperstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:35
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/126; F28F1/128; B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; B23K35/00; B23K35/001; B23K35/002; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/0535; F28F13/00; F28F13/06; F28F13/12; F28F19/00; F28F19/02; F28F19/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
A corrosion resistant heat exchanger assembly consisting essentially of: a partition having opposed sides and adapted to be contacted on a first side by a first heat exchange fluid and contacted on the other side by a second heat exchange fluid; a fin-like structure brazed to one of said sides to enhance heat exchange between the heat exchange fluid ont he associated side and said partition; one of said partition and said fin-like structure being formed of a ferrous material having an external aluminum coating facing the other of said partition and said fin-like structure; the other of said partition and said fin-like structure having an aluminum surface facing said one of said partition and said fin-like structure; and aluminum braze clad material at the interface of said partition and said fin-like structure; said assembly being characterized by the absence of any appreciable exposed layer of ferrous aluminum intermetallic compound or intermediate phase on said one of said partition and said fin-like structure in the area of said other of said partition and said fin-like structure.
Claim 2
Dependent Claim
176 words
A corrosion resistant heat exchanger assembly consisting essentially of: a partition having opposed sides and adapted to be contacted on a first side by a first heat exchange fluid and contacted on the other side by a second heat exchange fluid; a fin-like structure brazed to one of said sides to enhance heat exchange between the heat exchange fluid ont he associated side and said partition; one of said partition and said fin-like structure being formed of a ferrous material having an external aluminum coating facing the other of said partition and said fin-like structure; the other of said partition and said fin-like structure having an aluminum surface facing said one of said partition and said fin-like structure; and aluminum braze clad material at the interface of said partition and said fin-like structure; said assembly being characterized by the absence of any appreciable exposed layer of ferrous aluminum intermetallic compound or intermediate phase on said one of said partition and said fin-like structure in the area of said other of said partition and said fin-like structure.
Claim 3
Dependent Claim
17 words
The heat exchanger of claim 1 wherein said one side is an interior side of said partition.
Claim 4
Dependent Claim
14 words
The heat exchanger of claim 1 wherein said partition is defined by a tube.
Claim 5
Dependent Claim
14 words
The heat exchanger of claim 3 wherein said fin is located within said tube.
Claim 6
Dependent Claim
34 words
The heat exchanger of claim 3 wherein said tube is a flattened tube having opposed walls and said fin is located within said tube and extends between and is bonded to both said walls.
Claim 7
Dependent Claim
30 words
The heat exchanger of claim 3 wherein said tube is a flattened tube having opposed walls and wherein there are two said fins, one bonded to each of said walls.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |