US4441548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High heat transport capacity heat pipe
Assignee: Boeing Co
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Filing: 1981-12-28
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Granted: 1984-04-10
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Expires: 2001-12-28
Abstract
Abstract A heat pipe (90) of increased heat transport capacity, capable of being primed under gravity conditions, comprises a sealed envelope (95) defining an evaporator (110) and a condenser (115). An arterial tube (125) of large liquid carrying capability is provided with an axial slot (130) formed on the upper surface of a segment of the tube (125). The slot (130) has beveled surfaces (135), (140) which increase the capillary pumping action to transverse wicking bodies (150, 155). The bodies (150, 155) transport working fluid to or from circumferential grooves (120) formed in the evaporator (110) and condenser (115).
Inventors
- 👤 James L. Franklin
- 👤 Dale F. Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:36
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/04; F28D15/046; F28F; F28F2200/00; F28F2200/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
An improved heat pipe of increased heat transport capacity, comprising: a sealed envelope, a working fluid contained within said envelope; said fluid being capable of undergoing a liquid/vapor phase change, an evaporator section defined within said envelope for vaporizing said fluid, a condenser section defined within said envelope for condensing said vaporized fluid, whereby a liquid is formed, means forming a solid wall artery disposed within said envelope extending between said condenser section and said evaporator section for conducting said liquid by capillary action from said condenser section to said evaporator section, a channel formed on the upper surface of said artery; said channel being provided with beveled surfaces, means forming a liquid conducting wick; said wick means lying along the inner periphery of said envelope and extending within said evaporator and said condenser, a liquid conducting means abuttingly contacting said beveled surfaces within said evaporator section for conducting liquid from said channel to said evaporator wick means, and a liquid transporting means abuttingly contacting said beveled surfaces within said condenser section for transporting liquid from said condenser wick means to said channel.
Claim 2
Dependent Claim
183 words
An improved heat pipe of increased heat transport capacity, comprising: a sealed envelope, a working fluid contained within said envelope; said fluid being capable of undergoing a liquid/vapor phase change, an evaporator section defined within said envelope for vaporizing said fluid, a condenser section defined within said envelope for condensing said vaporized fluid, whereby a liquid is formed, means forming a solid wall artery disposed within said envelope extending between said condenser section and said evaporator section for conducting said liquid by capillary action from said condenser section to said evaporator section, a channel formed on the upper surface of said artery; said channel being provided with beveled surfaces, means forming a liquid conducting wick; said wick means lying along the inner periphery of said envelope and extending within said evaporator and said condenser, a liquid conducting means abuttingly contacting said beveled surfaces within said evaporator section for conducting liquid from said channel to said evaporator wick means, and a liquid transporting means abuttingly contacting said beveled surfaces within said condenser section for transporting liquid from said condenser wick means to said channel.
Claim 3
Dependent Claim
14 words
The heat pipe of claim 1, further comprising means for priming said heat pipe.
Claim 4
Dependent Claim
31 words
The heat pipe of claim 2, wherein said channel extends between said evaporator section and said condenser section whereby said artery may be vented when said heat pipe is being primed.
Claim 5
Dependent Claim
23 words
The heat pipe of claim 3, further comprising a porous screen covering said channel extending between said evaporator section and said condenser section.
Claim 6
Dependent Claim
22 words
The heat pipe of claim 3, wherein said liquid conducting means and said liquid transporting means each comprise a porous capillary slab.
Claim 7
Dependent Claim
29 words
The heat pipe of claim 5, wherein said beveled surfaces are oriented parallel to the centerline of said artery; each of said capillary slabs abuttingly contacting said beveled surfaces.
Claim 8
Dependent Claim
29 words
The heat pipe of claim 6, wherein said evaporator wick means and said condenser wick means each comprise a plurality of grooves capable of conducting liquid by capillary action.
Claim 9
Dependent Claim
35 words
The heat pipe of claim 7, wherein said envelope is a tube, said grooves extend circumferentially within the interior periphery of said tube; and said slabs extending radially outwardly from said channel to said grooves.
References Cited (Backward Citations)
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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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |