US5351750A
Expired / Lapsed
US
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Tubular element for a heat exchanger
Assignee: Valeo Engine Cooling Inc
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Filing: 1993-03-24
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Granted: 1994-10-04
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Expires: 2013-03-24
Abstract
Abstract A tubular element for a heat-exchanger comprises a tubular core composed of a first aluminum alloy comprising up to 0.3 wt % maximum of silicon, up to 0.5 wt % maximum of iron, from 0.50 to 0.70 wt % of copper, from 0.65 to 1.0 wt % of manganese, from 0.1 to 0.30 wt % of magnesium, up to 0.05 wt % maximum of zinc, from 0.08 to 0.10 wt % of titanium, and the balance aluminum and unavoidable impurities; an inner layer of a second aluminum alloy on the tubular core; and an outer brazable layer of a third aluminum alloy on the tubular core. The tubular core and the inner layer may be selected to have a corrosion potential difference of from 170 to 200 mV verses a saturated calomel electrode. The tubular core may have a grain size falling within the range about ASTM 5 to about ASTM 6 and the grains having a morphology which is elongated in the axial direction of the tubular core.
Inventors
- 👤 Jose J. Garcia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:37
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/02; F28F19/06; F28F2245/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
226 words
A tubular element for a heat-exchanger comprising: a tubular core composed of a first aluminum alloy comprising up to 0.3 wt % maximum of silicon, up to 0.5 wt % maximum of iron, from 0.50 to 0.70 wt % of copper, from 0.65 to 1.0 wt % of manganese, from 0.1 to 0.30 wt % of magnesium, up to 0.05 wt % maximum of zinc, from 0.08 to 0.10 wt % of titanium, and the balance aluminum and unavoidable impurities; an inner layer on the tubular core and composed of a second aluminum alloy comprising up to 0.70 wt % maximum in total of silicon and iron, up to 0.10 wt % maximum of copper, up to 0.10 wt % maximum of manganese, up to 0.10 wt % maximum of magnesium, from 0.80 to 1.3 wt % of zinc, up to 0.05 wt % maximum of titanium and the balance aluminum and unavoidable impurities; and an outer brazable layer on the tubular core and composed of a third aluminum alloy comprising from 6.8 to 8.2 wt % of silicon, up to 0.80 wt % maximum of iron, up to 0.25 wt % maximum of copper, up to 0.10 wt % maximum of manganese, up to 0.10 wt % maximum of zinc, up to 0.05 wt % maximum of titanium, and the balance aluminum and unavoidable impurities.
Claim 2
Dependent Claim
226 words
A tubular element for a heat-exchanger comprising: a tubular core composed of a first aluminum alloy comprising up to 0.3 wt % maximum of silicon, up to 0.5 wt % maximum of iron, from 0.50 to 0.70 wt % of copper, from 0.65 to 1.0 wt % of manganese, from 0.1 to 0.30 wt % of magnesium, up to 0.05 wt % maximum of zinc, from 0.08 to 0.10 wt % of titanium, and the balance aluminum and unavoidable impurities; an inner layer on the tubular core and composed of a second aluminum alloy comprising up to 0.70 wt % maximum in total of silicon and iron, up to 0.10 wt % maximum of copper, up to 0.10 wt % maximum of manganese, up to 0.10 wt % maximum of magnesium, from 0.80 to 1.3 wt % of zinc, up to 0.05 wt % maximum of titanium and the balance aluminum and unavoidable impurities; and an outer brazable layer on the tubular core and composed of a third aluminum alloy comprising from 6.8 to 8.2 wt % of silicon, up to 0.80 wt % maximum of iron, up to 0.25 wt % maximum of copper, up to 0.10 wt % maximum of manganese, up to 0.10 wt % maximum of zinc, up to 0.05 wt % maximum of titanium, and the balance aluminum and unavoidable impurities.
Claim 3
Dependent Claim
47 words
A tubular element according to claim 1, wherein the first and second aluminum alloys are selected so that the corrosion potential difference between the tubular core and the inner clad layer is in the range from about 170 to about 200 mV versus a saturated calomel electrode.
Claim 4
Dependent Claim
40 words
A tubular element according to claim 1, wherein the first and second aluminum alloys are selected so that the corrosion potential difference between the tubular core and the inner clad layer is about 185 mV versus a saturated calomel electrode.
Claim 5
Dependent Claim
43 words
A tubular element according to claim 1, wherein the tubular core has a grain size falling within the range about ASTM 5 to about ASTM 6 and the grains have a morphology which is elongated in the axial direction of the tubular core.
Claim 6
Dependent Claim
51 words
A tubular element according to claim 1, wherein the thickness of the inner clad layer is about 12 percent of the total wall thickness of the tubular element and the thickness of the outer clad layer is from 9 to 12 percent of the total wall thickness of the tubular element.
Claim 7
Dependent Claim
31 words
A tubular element according to claim 1, further comprising external fin members brazed thereto, said fin members being composed of the aluminum alloy "AA3003" which additionally includes 1.5 wt % zinc.
Claim 8
Dependent Claim
95 words
A tubular element for a heat exchanger, the tubular element comprising: a tubular core composed of a first aluminum alloy; and an inner layer clad on the tubular core, the inner clad layer being composed of a second aluminum alloy and being adapted, in use, to act as a sacrificial anodic layer for the tubular core, the first and second aluminum alloys being chosen so that the corrosion potential difference between the tubular core and the inner clad layer is in the range from about 170 to about 200 mV versus a saturated calomel electrode.
Claim 9
Dependent Claim
95 words
A tubular element for a heat exchanger, the tubular element comprising: a tubular core composed of a first aluminum alloy; and an inner layer clad on the tubular core, the inner clad layer being composed of a second aluminum alloy and being adapted, in use, to act as a sacrificial anodic layer for the tubular core, the first and second aluminum alloys being chosen so that the corrosion potential difference between the tubular core and the inner clad layer is in the range from about 170 to about 200 mV versus a saturated calomel electrode.
Claim 10
Dependent Claim
40 words
A tubular element according to claim 7, wherein the first and second aluminum alloys are chosen so that the corrosion potential difference between the tubular core and the inner clad layer is about 185 mV versus a saturated calomel electrode.
Claim 11
Dependent Claim
75 words
A tubular element according to claim 7, wherein the first aluminum alloy comprises up to 0.3 wt % maximum of silicon, up to 0.5 wt % maximum of iron, from 0.50 to 0.70 wt % of copper, from 0.65 to 1.0 wt % of manganese, from 0.1 to 0.30 wt % of magnesium, up to 0.05 wt % maximum of zinc, from 0.08 to 0.10 wt % titanium, and the balance aluminum and unavoidable impurities.
Claim 12
Dependent Claim
72 words
A tubular element according to claim 7, wherein the second aluminium alloy comprises up to 0.70 wt % maximum in total of silicon and iron, up to 0.10 wt % maximum of copper, up to 0.10 wt % maximum of manganese, up to 0.10 wt % maximum of magnesium, from 0.80 to 1.3 wt % of zinc, up to 0.05 wt % maximum of titanium and the balance aluminium and unavoidable impurities.
Claim 13
Dependent Claim
43 words
A tubular element according to claim 7, wherein the tubular core has a grain size falling within the range about ASTM 5 to about ASTM 6 and the grains have a morphology which is elongated in the axial direction of the tubular core.
Claim 14
Dependent Claim
81 words
A tubular element according to claim 7, further comprising an outer brazable layer clad on the tubular core and composed of a third aluminum alloy comprising from 6.8 to 8.2 wt % of silicon, up to 0.80 wt % maximum of iron, up to 0.25 wt % maximum of copper, up to 0.10 wt % maximum of manganese, up to 0.10 wt % maximum of zinc, up to 0.05 wt % maximum of titanium, and the balance aluminum and unavoidable impurities.
Claim 15
Dependent Claim
51 words
A tubular element according to claim 12, wherein the thickness of the inner clad layer is about 12 percent of the total wall thickness of the tubular element and the thickness of the outer brazable layer is from 9 to 12 percent of the total wall thickness of the tubular element.
Claim 16
Dependent Claim
84 words
A tubular element for a heat exchanger, the tubular element comprising: a tubular core comprised of a first aluminum alloy; an inner layer on the tubular core and composed of a second aluminum alloy; and an outer layer composed of a third aluminum alloy clad on the tubular core; the tubular core having a grain size falling within the range about ASTM 5 to about ASTM 6 and the grains having a morphology which is elongated in the axial direction of the tubular core.
Claim 17
Dependent Claim
84 words
A tubular element for a heat exchanger, the tubular element comprising: a tubular core comprised of a first aluminum alloy; an inner layer on the tubular core and composed of a second aluminum alloy; and an outer layer composed of a third aluminum alloy clad on the tubular core; the tubular core having a grain size falling within the range about ASTM 5 to about ASTM 6 and the grains having a morphology which is elongated in the axial direction of the tubular core.
Claim 18
Dependent Claim
76 words
A tubular element according to claim 14, wherein the first aluminum alloy comprises up to 0.3 wt % maximum of silicon, up to 0.5 wt % maximum of iron, from 0.50 to 0.70 wt % of copper, from 0.65 to 1.0 wt % of manganese, from 0.1 to 0.30 wt % of magnesium, up to 0.05 wt % maximum of zinc, from 0.08 to 0.10 wt % of titanium, and the balance aluminum and unavoidable impurities.
Claim 19
Dependent Claim
72 words
A tubular element according to claim 14, wherein the second aluminum alloy comprises up to 0.70 wt % maximum in total of silicon and iron, up to 0.10 wt % maximum of copper, up to 0.10 wt % maximum of manganese, up to 0.10 wt % maximum of magnesium, from 0.80 to 1.3 wt % of zinc, up to 0.05 wt % maximum of titanium, and the balance aluminum and unavoidable impurities.
Claim 20
Dependent Claim
68 words
A tubular element according to claim 14, wherein the third aluminum alloy comprises from 6.8 to 8.2 wt % of silicon, up to 0.80 wt % maximum of iron, up to 0.25 wt % maximum of copper, up to 0.10 wt % maximum of manganese, up to 0.10 wt % maximum of zinc, up to 0.05 wt % maximum of titanium, and the balance aluminum and unavoidable impurities.
Claim 21
Dependent Claim
47 words
A tubular element according to claim 14, wherein the first and second aluminum alloys are selected so that the corrosion potential difference between the tubular core and the inner clad layer is in the range from about 170 to about 200 mV versus a saturated calomel electrode.
Claim 22
Dependent Claim
40 words
A tubular element according to claim 18, wherein the first and second aluminum alloys are selected so that the corrosion potential difference between the tubular core and the inner clad layer is about 185 mV versus a saturated calomel electrode.
Claim 23
Dependent Claim
51 words
A tubular element according to claim 14, wherein the thickness of the inner clad layer is about 12 percent of the total wall thickness of the tubular element and the thickness of the outer clad layer is from 9 to 12 percent of the total wall thickness of the tubular element.
References Cited (Backward Citations)
US4121750A
Cited
US4173302A
Cited
US3809155A
Cited
US3843333A
Cited
JPS5233154A
Cited
US4214925A
Cited
JPS5595094A
Cited
US4560625A
Cited
US4587701A
Cited
JPS60227970A
Cited
GB2159175A
Cited
US4716959A
Cited
US4761267A
Cited
US5054549A
Cited
US4991647A
Cited
US5072789A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-10-03 | 1998-04-04 | 1998-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-03 | 2002-04-04 | 2002-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-03 | 2006-04-04 | 2006-10-04 | $7700.00 | Window Closed / Lapsed |