Patent US5508884A successfully refreshed from Google Patents.
US5508884A
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US
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System for dissipating heat energy generated by an electronic component and sealed enclosure used in a system of this kind
Assignee: Alcatel CIT SA
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Filing: 1995-06-01
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Granted: 1996-04-16
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Expires: 2015-06-01
Abstract
Abstract System for dissipating heat energy generated by an electronic component and sealed enclosure used in a system of this kind. The system for dissipating heat of the invention is of the type comprising a sealed metal enclosure (21) the interior volume of which contains a fluid (22), said component (11) being fixed to the outside wall of said enclosure (21) and connected to a heat dissipator (12) by said enclosure (21) and is characterized in that the phase change temperature of the fluid (22) at atmospheric pressure is less than a given maximum ambient temperature and in that said enclosure (21) also contains a volume of gas (23) different from the fluid (22) so that variation in the ambient temperature causes a variation in the pressure inside the enclosure (21) which modifies the phase change temperature of the fluid (22).
Inventors
- 👤 Patrice Brunet
- 👤 Gilles Avignon
- 👤 Franck Heron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:14
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/70; H10W40/73; F; F28; F28D; F28D15/00; F28D15/02; F28D15/06; H10W72/00; H10W72/851; H10W72/874; H10W72/884; H10W90/00; H10W90/701; H10W90/731; H10W90/736; H10W90/751; H10W90/754
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
252 words
A system for dissipating heat energy generated by an electronic component comprising a sealed metal enclosure the interior volume of which contains a liquid having a phase change temperature at atmospheric pressure, said component being fixed to the outside wall of said enclosure and connected to a heat dissipator by said enclosure, characterized in that the phase change temperature of said liquid at atmospheric pressure is less than a given maximum ambient temperature and in that said enclosure also contains a volume of a gas, said gas not being a vapor of said liquid and being only a gas at atmospheric pressure so that variation in the ambient temperature causes a variation in the pressure inside said enclosure which modifies the phase change temperature of said liquid, further characterized in that the ratio by which said enclosure is filled with said liquid is equal to: ##EQU5## with v 0 =v i =v 0 .β.ΔT where: V 0 is the volume of liquid used; v 0 is the residual volume of gas inside the enclosure under initial conditions; β is the coefficient of thermal expansion of the liquid; ΔT=T i -T 0 where T i is the maximum ambient temperature and T 0 is the temperature at which the enclosure is filled; P 0 is the ambient pressure when the enclosure is filled; P i is the pressure inside the enclosure at temperature T i ; v i is the volume of the gas in the enclosure at the pressure P i .
Claim 2
Independent Claim
252 words
A system for dissipating heat energy generated by an electronic component comprising a sealed metal enclosure the interior volume of which contains a liquid having a phase change temperature at atmospheric pressure, said component being fixed to the outside wall of said enclosure and connected to a heat dissipator by said enclosure, characterized in that the phase change temperature of said liquid at atmospheric pressure is less than a given maximum ambient temperature and in that said enclosure also contains a volume of a gas, said gas not being a vapor of said liquid and being only a gas at atmospheric pressure so that variation in the ambient temperature causes a variation in the pressure inside said enclosure which modifies the phase change temperature of said liquid, further characterized in that the ratio by which said enclosure is filled with said liquid is equal to: ##EQU5## with v 0 =v i =v 0 .β.ΔT where: V 0 is the volume of liquid used; v 0 is the residual volume of gas inside the enclosure under initial conditions; β is the coefficient of thermal expansion of the liquid; ΔT=T i -T 0 where T i is the maximum ambient temperature and T 0 is the temperature at which the enclosure is filled; P 0 is the ambient pressure when the enclosure is filled; P i is the pressure inside the enclosure at temperature T i ; v i is the volume of the gas in the enclosure at the pressure P i .
Claim 3
Dependent Claim
34 words
A system according to claim 1 characterized in that said enclosure has two substantially parallel walls and in that said component and said dissipator are each fixed to a respective one of said walls.
Claim 4
Dependent Claim
23 words
A system according to claim 1 characterized in that said component and said dissipator are fixed to the same wall of said enclosure.
Claim 5
Dependent Claim
73 words
A system according to claim 1 characterized in that said enclosure includes at least one pressurized gas concentration region which is not filled with said liquid when the ambient temperature is less than said maximum ambient temperature, said region being disposed for receiving said gas as said liquid expands at ambient temperature ever said phase change temperature, whereby said expanded liquid is operative to establish thermal contact between said component and said dissipator.
Claim 6
Dependent Claim
21 words
A system according to claim 1 characterized in that said component is a microwave transistor mounted in an electromagnetic shield box.
Claim 7
Dependent Claim
12 words
System according to claim 1 characterized in that said gas is air.
Claim 8
Dependent Claim
205 words
A sealed metal enclosure whose interior volume contains a liquid characterized in that the phase change temperature of said liquid at atmospheric pressure is less than a given maximum ambient temperature and in that said enclosure also contains a volume of a gas at said atmospheric pressure, said gas not being a vapor of said liquid so that variation in the ambient temperature causes a variation in pressure inside said enclosure which modifies the phase change temperature of said liquid, further characterized in that the ratio by which said enclosure is filled with said liquid is equal to: ##EQU6## with v 0 =v i +v 0 .β.ΔT where: V 0 is the volume of liquid used; v 0 is the residual volume of gas inside the enclosure under initial conditions; β is the coefficient of thermal expansion of the liquid; ΔT=T i -T 0 where T i is the maximum ambient temperature and T 0 is the temperature at which the enclosure is filled; P 0 is the ambient pressure when the enclosure is filled; P i is the pressure inside the enclosure at temperature T i ; v i is the volume of the gas in the enclosure at the pressure P i .
Claim 9
Dependent Claim
205 words
A sealed metal enclosure whose interior volume contains a liquid characterized in that the phase change temperature of said liquid at atmospheric pressure is less than a given maximum ambient temperature and in that said enclosure also contains a volume of a gas at said atmospheric pressure, said gas not being a vapor of said liquid so that variation in the ambient temperature causes a variation in pressure inside said enclosure which modifies the phase change temperature of said liquid, further characterized in that the ratio by which said enclosure is filled with said liquid is equal to: ##EQU6## with v 0 =v i +v 0 .β.ΔT where: V 0 is the volume of liquid used; v 0 is the residual volume of gas inside the enclosure under initial conditions; β is the coefficient of thermal expansion of the liquid; ΔT=T i -T 0 where T i is the maximum ambient temperature and T 0 is the temperature at which the enclosure is filled; P 0 is the ambient pressure when the enclosure is filled; P i is the pressure inside the enclosure at temperature T i ; v i is the volume of the gas in the enclosure at the pressure P i .
Claim 10
Dependent Claim
76 words
An enclosure according to claim 7 characterized in that it includes at least one pressurized gas concentration region which is not filled with said liquid when the ambient temperature is less than said maximum ambient temperature, said region being disposed for receiving said gas when pressurized as said liquid expands at ambient temperatures over said phase change temperature, whereby said expanded liquid is operative to establish thermal contact between an electronic component and a heat dissipator.
Claim 11
Dependent Claim
12 words
Enclosure according to claim 7 characterized in that said gas is air.
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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) | 1999-04-16 | 1999-10-16 | 2000-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-16 | 2003-10-16 | 2004-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-16 | 2007-10-16 | 2008-04-16 | $7700.00 | Window Closed / Lapsed |