Heat pipe with sintered powder wick
OwnerChu-Wan Hong, Jung-Yuan Wu +2inventors
InventorsChu-Wan Hong, Jung-Yuan Wu, Chang-Ting Lo, Ching-Tai Cheng
Life of this patent
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Abstract
A heat pipe (10) includes a casing (12) and a sintered powder wick (14) arranged at an inner surface of the casing. The sintered powder wick is in the form of a multi-layer structure in a radial direction of the casing and at least one layer is divided into multiple sections in a longitudinal direction of the casing, and the multiple sections have powder sizes different from each other. The sections with large-sized powders are capable of reducing the flow resistance to the condensed liquid to flow back while the sections with small-sized powders are capable of providing a satisfactory capillary force for moving the condensed liquid.
Claims19
A heat pipe comprising:
- a casing;
- and
- a sintered powder wick arranged at an inner surface of the casing;
- wherein
- the sintered powder wick is in the form of a multi-layer structure in a radial direction of the casing and at least one layer is divided into multiple sections in a longitudinal direction of the casing, and the multiple sections have powder sizes different from each other.
A method for manufacturing a heat pipe comprising steps of:
- (1) providing a hollow casing;
- (2) inserting a mandrel into the casing, and filling powders into said casing to form a layer of powder under the control of the mandrel;
- (3) pre-sintering the layer of powder at a first temperature and drawing out the mandrel;
- (4) repeating the steps of (2) and (3) until at least two layers of powder are formed inside the casing, wherein in forming one of the at least two layers of powder, at least two groups of powder with different powder sizes are used;
- and
- (5) sintering said at least two layers of powder at a second temperature higher than the first temperature, whereby a sintered powder wick with a multi-layer structure is formed inside the heat pipe.
A heat pipe for transmitting heat from one section of the heat pipe to another section of the heat pipe comprising:
- a metal hollow casing having an inner surface;
- and
- a sintered powder wick in the casing and adjacent to the inner surface, the wick comprising a plurality of layers along a radial direction of the casing and a plurality of sections along a longitudinal direction of the casing, wherein two neighboring sections of one of the layers have different pore sizes.
Dependencies are inferred from the claim text.