US4574878A
Expired / Lapsed
US
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Plate fin heat exchanger for superhigh pressure service
Assignee: Sumitomo Precision Products Co Ltd
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Filing: 1983-02-25
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Granted: 1986-03-11
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Expires: 2003-02-25
Abstract
Abstract A plate fin heat exchanger adapted to applications using superhigh-pressure fluids was fabricated by brazing, the heat exchanger using as fin stock an alloy consisting essentially of 0.3 to 1.0 wt. % Si, 0.05 to 0.25 wt. % Cu, 0.6 to 1.5 wt. % Mn and 0.45 to 0.9 wt. % Mg, the balance being aluminum and impurities, wherein said impurities contain up to 0.8 wt. % Fe. At least one component selected from the group consisting of 0.05 to 0.25 wt. % Cr, 0.01 to 0.25 wt. % Ti, 0.03 to 0.25 wt. % Zr and 0.01 to 0.25 wt. % V may be added to the above fin alloy stock. By using the above plate fin, excessive silicon diffusion from a brazing alloy into the fin, which may cause reduction of width of the brazed joint, is suppressed, and as a result, lowering of the bonding strength of the brazed joint is eliminated.
Inventors
- 👤 Yoshihiko Sugiyama
- 👤 Teruo Uno
- 👤 Hiroshi Irie
- 👤 Teruo Kurachi
- 👤 Tetsuo Abiko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:01
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/084; C; C22; C22C; C22C21/00; C22C21/06; C22C21/08; C22C21/12; C22C21/16; F28F3/00; F28F3/02; F28F3/025; Y; Y10; Y10S; Y10S165/00; Y10S165/905; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
80 words
In a brazed-plate-fin heat exchanger for use in a superhigh pressure service and comprising a corrugated fin disposed between two metal sheets and attached thereto by brazing, the improvement which comprises: said fins is made of an alloy consisting essentially of 0.3 to 1.0 wt.% Si, 0.05 to 0.25 wt.% Cu, 0.6 to 1.5 wt.% Mn, 0.45 to 0.9 wt.% Mg, up to 0.8 wt.% Fe, and balance being aluminum and impurities said alloy being free of calcium and tin.
Claim 2
Dependent Claim
80 words
In a brazed-plate-fin heat exchanger for use in a superhigh pressure service and comprising a corrugated fin disposed between two metal sheets and attached thereto by brazing, the improvement which comprises: said fins is made of an alloy consisting essentially of 0.3 to 1.0 wt.% Si, 0.05 to 0.25 wt.% Cu, 0.6 to 1.5 wt.% Mn, 0.45 to 0.9 wt.% Mg, up to 0.8 wt.% Fe, and balance being aluminum and impurities said alloy being free of calcium and tin.
Claim 3
Dependent Claim
112 words
In a brazed-plate-fin heat exchanger for use in a superhigh pressure service and comprising a corrugated fin disposed between two metal sheets and attached thereto by brazing, the improvement which comprises: said fin is made of an alloy consisting essentially of 0.3 to 1.0 wt.% Si, 0.05 to 0.25 wt.% Cu, 0.6 to 1.5 wt.% Mn, 0.45 to 0.9 wt.% Mg, up to 0.8 wt.% Fe, and at least one component selected from the group consisting of 0.05 to 0.25 wt.% Cr, 0.01 to 0.25 wt.% Ti, 0.03 to 0.25 wt.% Zr and 0.01 to 0.25 wt.% V, the balance being aluminum and impurities said alloy being free of calcium and tin.
Claim 4
Dependent Claim
112 words
In a brazed-plate-fin heat exchanger for use in a superhigh pressure service and comprising a corrugated fin disposed between two metal sheets and attached thereto by brazing, the improvement which comprises: said fin is made of an alloy consisting essentially of 0.3 to 1.0 wt.% Si, 0.05 to 0.25 wt.% Cu, 0.6 to 1.5 wt.% Mn, 0.45 to 0.9 wt.% Mg, up to 0.8 wt.% Fe, and at least one component selected from the group consisting of 0.05 to 0.25 wt.% Cr, 0.01 to 0.25 wt.% Ti, 0.03 to 0.25 wt.% Zr and 0.01 to 0.25 wt.% V, the balance being aluminum and impurities said alloy being free of calcium and tin.
Claim 5
Dependent Claim
18 words
A heat exchanger as claimed in claim 2, wherein said alloy contains at least two of said components.
Claim 6
Dependent Claim
18 words
A heat exchanger as claimed in claim 2, wherein said alloy contains at least three of said components.
Claim 7
Dependent Claim
29 words
A heat exchanger as claimed in claim 2, wherein said fin stock material consists of Si, Cu, Mn, Mg, Fe and Cr, the balance being aluminum and unavoidable impurities.
Claim 8
Dependent Claim
29 words
A heat exchanger as claimed in claim 2, wherein said fin stock material consists of Si, Cu, Mn, Mg, Fe and Ti, the balance being aluminum and unavoidable impurities.
Claim 9
Dependent Claim
29 words
A heat exchanger as claimed in claim 2, wherein said fin stock material consists of Si, Cu, Mn, Mg, Fe and Zr, the balance being aluminum and unavoidable impurities.
Claim 10
Dependent Claim
29 words
A heat exchanger as claimed in claim 2, wherein said fin stock material consists of Si, Cu, Mn, Mg, Fe and V, the balance being aluminum and unavoidable impurities.
Claim 11
Dependent Claim
48 words
A heat exchanger as claimed in claim 2, wherein said alloy consists of approximately 0.6 wt.% Si, 0.15 wt.% Cu, 1.3 wt.% Mn, 0.5 wt.% Mg, 0.07 wt.% Cr, less than 0.01 wt.% Ti, 0.09 wt.% Zr, 0.08 wt.% V, 0.4 wt.% Fe, and the balance is aluminum.
Claim 12
Dependent Claim
46 words
A heat exchanger as claimed in claim 2, wherein said alloy consists of approximately 0.6 wt.% Si, 0.15 wt.% Cu, 1.3 wt.% Mn, 0.5 wt.% Mg, 0.07 wt.% Cr, 0.05 wt.% Ti, 0.08 wt.% Zr, 0.07 wt.% V, 0.4 wt.% Fe, and the balance is aluminum.
Claim 13
Dependent Claim
113 words
In a brazed-plate-fin heat exchanger for use in a superhigh pressure service and comprising a corrugated fin disposed between two metal sheets and attached thereto by brazing, the improvement which comprises: said fin is made of an alloy which consists of 0.43 to 0.89 wt.% Si, 0.10 to 0.24 wt.% Cu, 0.82 to 1.4 wt.% Mn, 0.5 to 0.82 wt.% Mg, 0.2 to 0.4 wt.% Fe, and at least one element selected from the group consisting of 0.07 to 0.1 wt.% Cr, 0.01 to 0.05 wt.% Ti, 0.08 to 0.1 wt.% Zr and 0.07 to 0.1 wt.% V, the balance being aluminum and unavoidable impurities said alloy being free of calcium and tin.
Claim 14
Dependent Claim
113 words
In a brazed-plate-fin heat exchanger for use in a superhigh pressure service and comprising a corrugated fin disposed between two metal sheets and attached thereto by brazing, the improvement which comprises: said fin is made of an alloy which consists of 0.43 to 0.89 wt.% Si, 0.10 to 0.24 wt.% Cu, 0.82 to 1.4 wt.% Mn, 0.5 to 0.82 wt.% Mg, 0.2 to 0.4 wt.% Fe, and at least one element selected from the group consisting of 0.07 to 0.1 wt.% Cr, 0.01 to 0.05 wt.% Ti, 0.08 to 0.1 wt.% Zr and 0.07 to 0.1 wt.% V, the balance being aluminum and unavoidable impurities said alloy being free of calcium and tin.
Claim 15
Dependent Claim
18 words
A heat exchanger as claimed in claim 11, wherein said alloy contains at least two of said components.
Claim 16
Dependent Claim
18 words
A heat exchanger as claimed in claim 11, wherein said alloy contains at least three of said components.
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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) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |