FLATTENED HEAT PIPE AND MANUFACTURING METHOD THEREOF
First Claim
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1. A flattened heat pipe, comprising:
- a flat and tubular closed container;
at least one wick structure; and
a working fluid sealed into the container, whereinthe wick structure consists of a sintered metal formed of sintered globular or deformed powder,a cross-sectional shape of the wick structure in the container is formed into a semi-elliptical shape having a curved portion and a flat portion,the flat portion of the wick structure is in contact with an inner wall of the container,the curved portion of the wick structure is in contact with or in close proximity to the inner wall of the container by leaving a gap less than a predetermined distance,a capillary force is generated between the curved portion and the inner wall, while a capillary force is also generated in voids formed in the sintered metal, andvapor flowing passages are formed at least in curved areas of both sides of the container.
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Abstract
The invention provides a flattened heat pipe whose vapor flowing passage is not clogged and which has an excellent capillary force. The flattened heat pipe has a closed container formed by flattening a tubular container, a plurality of wick structures arrayed within the container in a longitudinal direction so as to form an acute-angled portion where a capillary force is large at least partially within the container, a hollow portion formed of an outer peripheral surface of the wick structure and an inner wall surface of the container and a working fluid sealed into the container.
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Citations
34 Claims
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1. A flattened heat pipe, comprising:
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a flat and tubular closed container; at least one wick structure; and a working fluid sealed into the container, wherein the wick structure consists of a sintered metal formed of sintered globular or deformed powder, a cross-sectional shape of the wick structure in the container is formed into a semi-elliptical shape having a curved portion and a flat portion, the flat portion of the wick structure is in contact with an inner wall of the container, the curved portion of the wick structure is in contact with or in close proximity to the inner wall of the container by leaving a gap less than a predetermined distance, a capillary force is generated between the curved portion and the inner wall, while a capillary force is also generated in voids formed in the sintered metal, and vapor flowing passages are formed at least in curved areas of both sides of the container. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A flattened heat pipe, comprising:
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a flat and tubular closed container; a plurality of wick structures; and a working fluid sealed into the container, wherein the wick structures consist of sintered metals formed of sintered globular or deformed powder, cross-sectional shapes of the wick structures in the container are respectively formed into semi-elliptical shapes having curved portions and flat portions, the flat portions of the wick structures are in contact with an inner wall of the container, the curved portions of neighboring wick structures are in contact with or in close proximity to each other by leaving a gap less than a predetermined distance, a capillary force is generated between neighboring curved portions, while a capillary force is also generated in voids formed in the sintered metals, and vapor flowing passages are formed at least in curved areas of both sides of the container. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A manufacturing method of a flattened heat pipe, comprising steps of:
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inserting a core rod, having a cross sectional shape in which one part is cut from a substantially circular shape so as to form a flat cutaway portion, into a tubular contoured object of which one end is concealed or having a narrower diameter; filling metal powder into a space formed by the cutaway portion and an inner wall of the tubular contoured object; heating the tubular contoured object in a state in which the core rod is inserted to prepare a sintered metal in contact with the inner wall; pulling the core rod out of the tubular contoured object; and pressing and deforming the tubular contoured object to form a deformed container so that the sintered metal is in contact with the inner wall or in close proximity to the inner wall with a gap less than a predetermined distance. - View Dependent Claims (30, 31)
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32. A manufacturing method of a flattened heat pipe, comprising steps of:
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inserting a core rod, having a cross sectional shape in which a plurality of parts are cut from a substantially circular shape so as to form flat cutaway portions, into a tubular contoured object of which one end is concealed or having a narrower diameter; filling metal powder into spaces formed by the cutaway portions and an inner wall of the tubular contoured object; heating the tubular contoured object in a state in which the core rod is inserted to prepare sintered metals in contact with the inner wall; pulling the core rod out of the tubular contoured object; and pressing and deforming the tubular contoured object to form a deformed container so that the sintered metals are in contact with each other or in close proximity to each other with a gap less than a predetermined distance. - View Dependent Claims (33, 34)
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Specification