US4587701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing an aluminum heat exchanger
Assignee: Sanden Corp
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Filing: 1984-08-27
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Granted: 1986-05-13
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Expires: 2004-08-27
Abstract
Abstract A serpentine-type aluminum heat exchanger comprising a serpentine-anfractuous flat tube of an aluminum alloy, a plurality of corrugated fin units made of an aluminum alloy having a high aluminum content of 99 wt. % or more, and brazing metal coating layers fixed onto entire flat surfaces of parallel portions of the serpentine-anfractuous flat tube and for joining the flat tube and the fin units, is produced by preparing the serpentine-anfractuous flat tube of an aluminum alloy, the corrugated fin units and U-shaped members of an aluminum alloy brazing filler metal, closely fitting the U-shaped members onto the parallel portions of the flat tube, disposing the fin units in spaces between adjacent U-shaped members fitted onto the parallel portions of the flat tube, and heating the flat tube, the fin units and U-shaped members in the assembled relation to the brazing temperature.
Inventors
- 👤 Mikio Koisuka
- 👤 Hisao Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:44
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/089; B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B21D53/085; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; F28D1/0478; F28F1/00; F28F1/10; F28F1/12; F28F1/126; F28F21/081; F28F21/084; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49359; Y10T29/49377; Y10T29/49378; Y10T29/4938
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
195 words
In a method for producing an aluminum heat exchanger, wherein a flat aluminum tube is provided having at least one refrigerant passageway therein, said tube being formed into a serpentine-anfractuous shape in a longitudinal direction of said tube and characterized by a plurality of spaced parallel walls, into each space of which a corrugated aluminum metal fin unit is interposed, each brazed to corresponding parallel walls of said flat tube, the improvement which comprises: providing said serpentine-anfractuous flat aluminum metal tube, said corrugated fin units of a first aluminum metal having a high aluminum content of 99 wt. % or more, and a plurality of U-shaped members of an aluminum alloy filler brazing metal; closely fitting each of said U-shaped members of brazing metal between and onto said parallel walls of said flat tube, respectively; closely fitting said corrugated fin units in spaces within said U-shaped brazing members to form a heat exchanger assembly thereof; and heating said assembly to a brazing temperature to effect joining of said fin units and said flat tube and provide a coating layer of said brazing metal on an entire surface of said parallel walls of said flat tube.
Claim 2
Dependent Claim
195 words
In a method for producing an aluminum heat exchanger, wherein a flat aluminum tube is provided having at least one refrigerant passageway therein, said tube being formed into a serpentine-anfractuous shape in a longitudinal direction of said tube and characterized by a plurality of spaced parallel walls, into each space of which a corrugated aluminum metal fin unit is interposed, each brazed to corresponding parallel walls of said flat tube, the improvement which comprises: providing said serpentine-anfractuous flat aluminum metal tube, said corrugated fin units of a first aluminum metal having a high aluminum content of 99 wt. % or more, and a plurality of U-shaped members of an aluminum alloy filler brazing metal; closely fitting each of said U-shaped members of brazing metal between and onto said parallel walls of said flat tube, respectively; closely fitting said corrugated fin units in spaces within said U-shaped brazing members to form a heat exchanger assembly thereof; and heating said assembly to a brazing temperature to effect joining of said fin units and said flat tube and provide a coating layer of said brazing metal on an entire surface of said parallel walls of said flat tube.
Claim 3
Dependent Claim
31 words
A method as claimed in claim 1, wherein said flat tube is made of a second aluminum metal having a corrosion potential substantially equal to that of said first aluminum alloy.
Claim 4
Dependent Claim
30 words
A method as claimed in claim 1, wherein said flat tube is made of a second aluminum metal having a corrosion potential nobler than that of said first aluminum alloy.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 2, wherein said second aluminum metal has a high aluminum content of 99 wt. % or more.
Claim 6
Dependent Claim
68 words
A method as claimed in claim 4, wherein said first and second aluminum metals are an aluminum alloy comprising 0.25 wt. % or less Si, 0.40 wt. % or less Fe, 0.05 wt. % or less Cu, 0.05 wt. % or less Mn, 0.05 wt. % or less Mg, 0.05 wt. % or less Zn, 0.03 wt. % or less Ti and 99.50 wt. % or more Al.
Claim 7
Dependent Claim
48 words
A method as claimed in claim 3, wherein said second aluminum metal is an aluminum alloy which comprises 0.6 wt. % or less Si, 0.7 wt. % or less Fe, 0.05-0.2 wt. % Cu, 1.0-1.5 wt. % Mn, 0.10 wt. % or less Zn and the balance Al.
Claim 8
Dependent Claim
58 words
A method as claimed in claim 1, wherein said U-shaped members are made of an aluminum alloy which comprises 0.3 wt. % or less Cu, 5-13 wt. % Si, 0.8 wt. % or less Fe, 0.15 wt. % or less Mn, up to 0.1 wt. % Mg, 0.2 wt. % or less Zn, and the balance substantially Al.
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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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |