Abstract: A method is disclosed to produce a wick structure for a heat pipe. The wick structure is a sintered powder wick and is produced by sintering process. A group of powders is firstly provided. The group of powders is then classified into many sub-groups in terms of powder size. At least one sub-group of the powders is selected to form the wick structure via the sintering process. Thus, the powders used to construct the wick structure are confined to powders having a relatively narrower range of powder size in relative to the group of powders as originally provided. This has greatly reduced the complexity involved in the sintering process, and as a result, the required sintering temperature and the required time for the sintering process are easier to be determined.

Abstract: A heat pipe (10) includes a hollow pipe body (20) for receiving a working fluid therein and a screen mesh (30) disposed in the pipe body. The screen mesh includes at least two layers. One of the two layers is in the form of a planar layer (50) and the other is in the form of a wave layer (40). A plurality of flowing channels (48) is formed by the wave layer. The channels formed by the wave layer of the screen mesh are capable of reducing the flow resistance for the condensed fluid to flow back while pores in the screen mesh provide a relatively large capillary pressure for drawing the condensed fluid to flow back.

Abstract: A heat pipe (10) includes a pipe body (20) having an inner wall (22) and a screen mesh (30) disposed on the inner wall of the pipe body. The screen mesh is in the form of a multi-layer structure with at least one layer thereof having an average pore size different from that of the other layers. The layer with large-sized pores is capable of reducing the flow resistance to the condensed fluid to flow back, whereas the layer with small-size pores is capable of providing a relatively large capillary pressure for drawing the condensed fluid from the condensing section to the evaporating section.

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 of at least three layers and each layer has an average powder size different from that of the other layers, wherein the layer (143) with large-sized powders is capable of reducing the flow resistance to the condensed liquid to flow back while the layer (141) with small-sized powders is still capable of providing a relatively large capillary force for the wick.

Abstract: A heat pipe (10) includes a pipe body (30) filled with working fluid, a screen mesh (50) located in the pipe body, a porous support member (70) supporting the screen mesh to contact with an inner wall (32) of the pipe body.

Abstract: A bearing system includes a bearing, a shaft extending in the bearing, and a layer of nano-structured coating coated on one of the bearing and the shaft. A space is formed between the bearing and the shaft, and a lubricant is filled in the space. The lubricant is made of polymer material with hydrophilic and hydropholic properties. The nano-structured coating has a high surface tension which results in the coating being capable of adsorbing the lubricant to form a layer of lubricant film between the coating and the other of the bearing and the shaft, thereby reducing possibility of direct contact between the lubricant and the other of the shaft and the bearing. Thus, loss of the lubricant is reduced to avoid contacting frication between the shaft and the bearing. Accordingly, noise generated by the bearing system is decreased and life of the bearing system is extended.