Brazed wick for a heat transfer device and method of making same
First Claim
1. A capillary structure for a heat transfer device comprising:
- a plurality of particles joined together by a brazing compound such that fillets of said brazing compound are formed between adjacent ones of said plurality of particles so as to form a network of capillary passageways between said particles.
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Accused Products
Abstract
A capillary structure for a heat transfer device, such as a heat pipe is provided having a plurality of particles joined together by a brazing compound such that fillets of the brazing compound are formed between adjacent ones of the plurality of particles. In this way, a network of capillary passageways are formed between the particles to aid in the transfer of working fluid by capillary action, while the plurality of fillets. provide enhanced thermal transfer properties between the plurality of particles so as to greatly improve over all heat transfer efficiency of the device. A method of making the capillary structure according to the invention is also presented.
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Citations
58 Claims
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1. A capillary structure for a heat transfer device comprising:
a plurality of particles joined together by a brazing compound such that fillets of said brazing compound are formed between adjacent ones of said plurality of particles so as to form a network of capillary passageways between said particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 21)
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15. A heat pipe comprising:
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a hermetically sealed and partially evacuated enclosure, said enclosure comprising internal surfaces;
a wick disposed on at least one of said internal surfaces and comprising a plurality of particles joined together by a brazing compound such that fillets of said brazing compound are formed between adjacent ones of said plurality of particles so as to form a network of capillary passageways between said particles; and
a two-phase fluid at least partially disposed within a portion of said wick. - View Dependent Claims (16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28)
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29. A heat pipe comprising a sealed and partially evacuated tubular enclosure having an internal surface covered by a brazed wick comprising a plurality of copper particles joined together by a brazing compound comprising about sixty-five percent weight copper and thirty-five percent weight gold such that fillets of said brazing compound are formed between adjacent ones of said plurality of particles so as to form a network of capillary passageways between said particles;
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a working fluid disposed within said tubular enclosure.
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30. A heat pipe comprising:
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a sealed and partially evacuated enclosure having an internal surface;
a grooved brazed wick disposed upon said internal surface comprising a plurality of individual particles which together yield an average particle diameter and a brazing compound such that fillets of said brazing compound are formed between adjacent ones of said plurality of particles, and further including at least two lands that are in fluid communication with one another through a particle layer disposed between said at least two lands wherein said particle layer comprises at least one dimension that is no more than about six average particle diameters wherein said particles in said particle layer are thermally engaged with one another by a plurality of said fillets; and
a working fluid disposed within said enclosure. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A heat pipe comprising:
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a sealed and partially evacuated enclosure having an internal surface;
a grooved brazed wick disposed upon said internal surface comprising a plurality of individual particles and a brazing compound such that fillets of said brazing compound are formed between adjacent ones of said plurality of particles, and further including at least two lands that are in fluid communication with one another wherein said particles are thermally engaged with one another by a plurality of said fillets; and
a working fluid disposed within said enclosure.
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45. A heat pipe comprising:
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a sealed and partially evacuated tubular enclosure having an internal surface covered by a brazed wick comprising a plurality of particles joined together by a brazing compound such that fillets of said brazing compound are formed between adjacent ones of said plurality of particles so as to form a network of capillary passageways between said particle and sealed at a first end;
a base sealing fixed to a second end of said enclosure so as to form an internal surface within said enclosure;
a working fluid disposed within said enclosure;
at least one fin projecting radially outwardly from an outer surface of said tubular enclosure; and
a grooved brazed wick disposed upon said internal surface comprising a plurality of individual particles which together yield an average particle diameter and a brazing compound such that fillets of said brazing compound are formed between adjacent ones of said plurality of particles, and further including at least two lands that are in fluid communication with one another through a particle layer disposed between said at least two lands wherein said particle layer comprises at least one dimension that is no more than about six average particle diameters wherein said particles in said particle layer are thermally engaged with one another by a plurality of said fillets. - View Dependent Claims (56, 57, 58)
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46. A method for making a capillary structure on an inside surface of a container, comprising the steps of:
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(a) providing a slurry of metal particles that are mixed with a brazing compound wherein said metal particles comprise a first melting temperature and said brazing compound comprises a second melting temperature that is lower than said first melting temperature;
(b) coating at least portion of said inside surface of said container with said slurry;
(c) drying said slurry to form a green wick; and
,(d) heating said green wick to a temperature that is no less than said second melting temperature and below said first melting temperature so that said brazing compound is drawn by capillary action toward adjacent of said metal particles so as to form heat-distribution fillets between said adjacent metal particles thereby to yield a brazed wick. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53)
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54. A method for making a heat pipe wick on an inside surface of a heat pipe container, comprising the steps of:
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(a) positioning a mandrel having a grooved contour and a plurality of recesses within a portion of said container;
(b) providing a slurry of metal particles having an average particle diameter and that are mixed with a brazing compound wherein said metal particles comprise a first melting temperature and said brazing compound comprises a second melting temperature that is lower than said first melting temperature;
(c) coating at least portion of the inside surface of said container with said slurry so that said slurry conforms to said grooved contour of said mandrel and forms a layer of slurry between adjacent grooves that comprises no more than about six average particle diameters;
(d) drying said slurry to form a green wick; and
,(e) heating said green wick to a temperature that is no less than said second melting temperature and below said first melting temperature so that said brazing compound is drawn by capillary action toward adjacent of said metal particles so as to form heat-distribution fillets between said adjacent metal particles thereby to yield a brazed wick. - View Dependent Claims (55)
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Specification