US4955525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger and method of producing same
Assignee: MA Aluminum Corp
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Filing: 1989-02-27
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Granted: 1990-09-11
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Expires: 2009-02-27
Abstract
Abstract A method of producing a heat exchanger comprising abutting a tube made of an aluminum material and fins made of an aluminum material, applying to the resulting abutments a flux containing zinc halide, and thereafter conducting a reaction soldering in an inert gas atmosphere. The assembled tube and fins applied with the flux may be moved in a position to enhance the formation of zinc deposited by the reaction soldering during the drying step of the flux. The heat exchanger produced by this method has a thick and uniform Zn coating at the joints with good mechanical strength and surface conditions.
Inventors
- 👤 Hajime Kudo
- 👤 Masami Asano
- 👤 Ken Toma
- 👤 Yo Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:37
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/282; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B23K1/00; B23K1/0008; B23K1/0012; B23K35/34; B23K35/36; B23K35/3601; B23K35/3603; F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; F28D1/0478
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
55 words
A heat exchanger composed of an aluminum tube and aluminum fins abutted to said tube, the joints of said tube and said fins having been soldered by zinc deposited by a reaction soldering using a flux containing 10-50 weight % of zinc halide and 10-60 weight % of Zn powder in an inert gas atmosphere.
Claim 2
Dependent Claim
55 words
A heat exchanger composed of an aluminum tube and aluminum fins abutted to said tube, the joints of said tube and said fins having been soldered by zinc deposited by a reaction soldering using a flux containing 10-50 weight % of zinc halide and 10-60 weight % of Zn powder in an inert gas atmosphere.
Claim 3
Dependent Claim
16 words
The heat exchanger according to claim 1, wherein said zinc halide employed was ZnCl 2 .
Claim 4
Dependent Claim
22 words
The heat exchanger according to claim 1, wherein said tube was made of an aluminum alloy containing 0.1-3 weight % of Zn.
Claim 5
Dependent Claim
23 words
The heat exchanger according to claim 1, wherein said fins were made of an aluminum alloy containing 0.3-6.5 weight % of Zn. 18
Claim 6
Dependent Claim
28 words
The heat exchanger according to claim 1, wherein said fins were made of an aluminum alloy containing 0.3-6.5 weight % of Zn and 0.1-2.2 weight % of Mg.
Claim 7
Dependent Claim
55 words
The heat exchanger according to claim 1, wherein in the course of drying of said flux containing zinc halide and Zn powder applied to the joints of said tube and said fins, said heat exchanger applied with said flux is moved in a position to enhance the formation of zinc deposited by the reaction soldering.
Claim 8
Dependent Claim
40 words
The heat exchanger according to claim 1, wherein said heat exchanger is positioned according to claim 24 30 seconds to 30 minutes after the initiation of drying of said flux at a temperature of from about 100 to 300° C.
Claim 9
Dependent Claim
22 words
The heat exchanger according to claim 1, wherein said inert gas was one with a dew point of -10° C. or less.
Claim 10
Dependent Claim
13 words
The heat exchanger according to claim 8, wherein said inert gas was Ar.
Claim 11
Dependent Claim
16 words
The heat exchanger according to claim 8, or wherein said inert gas was N 2 .
Claim 12
Dependent Claim
14 words
The heat exchanger according to claim 8, or wherein said inert gas was flowing.
Claim 13
Dependent Claim
31 words
The heat exchanger according to claim 11, wherein said inert gas was flowing at a speed of 1×10 -3 -1 m/s in the vicinity of said flux applied to said joints.
Claim 14
Dependent Claim
31 words
The heat exchanger according to claim 1, wherein said inert gas was flowing at a speed of 1×10 -3 -1 m/s in the vicinity of said flux applied to said joints.
Claim 15
Dependent Claim
13 words
The heat exchanger according to claim 1, wherein said inert gas was Ar.
Claim 16
Dependent Claim
15 words
The heat exchanger according to claim 1, wherein said inert gas was N 2 .
Claim 17
Dependent Claim
13 words
The heat exchanger according to claim 1, wherein said inert gas was flowing.
Claim 18
Dependent Claim
30 words
The heat exchanger according to claim 16, wherein said inert gas was flowing at a speed of 1×10 -3 -1 m/s in the vicinity of said flux applied to joints.
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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) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |