US3746081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer device
Assignee: General Electric Co
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Filing: 1971-03-16
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Granted: 1973-07-17
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Expires: 1991-03-16
Abstract
Abstract In a heat pipe the portion of the wicking material which receives the liquid condensed at the condenser surface at the heat output end of the heat pipe is provided with a plurality of large openings extending from the surface adjacent the condenser surface to the opposing surface thereof to avoid condensate accumulation adjacent the condensation surface. Such accumulation blocks access of the condensation surface to vapor and hence increases the thermal impedance of the heat output end of the heat pipe.
Inventors
- 👤 J Corman
- 👤 G Walmet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:23
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/04; F28D15/046
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
263 words
In a heat pipe, the combination of a wall having a pair of opposed surfaces, a layer of wicking material having a pair of opposed surface portions, one of which is located adjacent to one of said surfaces of said wall to absorb liquid therefrom, said layer of wicking material including a multiplicity of capillary passages of small cross-sectional area extending in various directions and to various extents and interconnected to move liquid therethrough from one surface portion to the other surface portion and including a plurality of openings, each opening being of large cross-sectional area in relation to the cross-sectional area of a capillary passage and each opening extending from one surface portion to the opposed surface portion of the layer of wicking material to provide a low impedance path for the passage of vapor therethrough, the total cross-sectional area of said openings being a substantial part of the total surface area of one of said surface portions, means for applying condensible vapor through saId openings in said layer of wicking material to one of said wall surfaces, the other of said opposed wall surfaces being adapted to be connected to a heat sink to cause vapor in contact with said one wall surface to condense, said openings being of a generally circular cross section and substantially larger in cross section than the mean cross section of said capillary passages, said one surface portion of said layer of wicking material being spaced apart from said one wall surface by a small distance which is larger than the diameter of a capillary passage.
Claim 2
Dependent Claim
263 words
In a heat pipe, the combination of a wall having a pair of opposed surfaces, a layer of wicking material having a pair of opposed surface portions, one of which is located adjacent to one of said surfaces of said wall to absorb liquid therefrom, said layer of wicking material including a multiplicity of capillary passages of small cross-sectional area extending in various directions and to various extents and interconnected to move liquid therethrough from one surface portion to the other surface portion and including a plurality of openings, each opening being of large cross-sectional area in relation to the cross-sectional area of a capillary passage and each opening extending from one surface portion to the opposed surface portion of the layer of wicking material to provide a low impedance path for the passage of vapor therethrough, the total cross-sectional area of said openings being a substantial part of the total surface area of one of said surface portions, means for applying condensible vapor through saId openings in said layer of wicking material to one of said wall surfaces, the other of said opposed wall surfaces being adapted to be connected to a heat sink to cause vapor in contact with said one wall surface to condense, said openings being of a generally circular cross section and substantially larger in cross section than the mean cross section of said capillary passages, said one surface portion of said layer of wicking material being spaced apart from said one wall surface by a small distance which is larger than the diameter of a capillary passage.
Claim 3
Dependent Claim
62 words
The combination of claim 1 further comprising spacers of wicking material for supporting the layer of wicking material in spaced apart relation from said one wall surface, said wicking material and spacers being comprised of fibres which are intertwined forming an integral body wherein the mean pore diameter of the capillary passages in said layer and in said spacers are the same.
References Cited (Backward Citations)
US3450195A
Cited
US3666005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |