TWI308952B - Heat pipe and method for making the same - Google Patents

Description

1308952 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a heat pipe and a method of preparing the same. [Prior Art] A heat pipe is a heat-conducting element that realizes heat conduction by a phase change of its internal working fluid, and has excellent characteristics such as high heat conductivity, excellent isothermality, good heat conduction effect, and wide application. In recent years, the rapid development of electronic technology, the high frequency, high speed of electronic devices and the intensive and miniaturization of integrated circuits have caused the heat generation per unit volume of electronic devices to increase dramatically. The heat pipe technology is characterized by its high efficiency, compactness, flexibility and reliability. Thermal issues due to performance improvements in electronic devices. ... Referring to the first figure, a typical heat pipe 10 is composed of a casing 11, a wick 12 (capillary structure), and a working fluid 13 sealed in the office. The heat pipe is usually made by vacuuming the inside of the pipe and then filling it with a suitable working fluid 13, so that the wick 12 which is in close contact with the inner wall of the pipe is filled with the working fluid 13 and sealed. One end of the heat official 10 is an evaporation section l〇a (heating section), and the other end is a condensation section 1〇b (cooling section), and an adiabatic section can be disposed between the evaporation section 10a and the condensation section l〇b according to application requirements. When the heat pipe 1〇 evaporation section 1〇a fork heats, the working fluid 13 in the wick 12 vaporizes and vaporizes to form a vapor ι4, and the vapor μ flows to the condensation section l〇b of the heat pipe 10 under a slight pressure difference, and condenses into a working fluid 13 The heat is discharged 15 and the working fluid 13 flows back along the wick 12 to the evaporation section 1〇a by capillary action. In this cycle, the heat 15 is continuously transmitted from the strip section 10a of the heat pipe to the condensation section i〇b, and is absorbed by the cold source at one end of the condensation section 1〇b. The heat pipe 10 includes the following six main processes associated with each other during the heat conduction process: (1) The heat 15 is supplied from the heat source through the heat pipe casing 11 and the wick 12 filled with the working fluid 丨3 to the working fluid 13; ^ (2) The working fluid 13 evaporates on the liquid-gas interface in the evaporation section 1 〇a; (3) the vapor 14 flows from the evaporation section 1 〇a to the condensation section 1 〇b; (4) the helium 14 is in the condensation section l〇b Coagulation on the gas-liquid interface;

(5) The heat enthalpy 15 is transmitted from the gas-liquid interface through the wick 12, the working fluid 13 犮 the shell π to the A

Source; T coffee (6) in the liquid absorbing magic 2 due to capillary action, the condensed working fluid 丨3 is returned to the evaporation section

Claims (1)

1308952 &ϊ, 12. 2 0 10. Patent application scope: 1. A thermal officer comprising a hollow casing and a working fluid sealed in the casing, wherein the inner wall of the casing is formed with a plurality of evenly arranged fine The depression has a diameter and a depth having a nanometer size 'the distance between each adjacent two minute depressions is a nanometer size, which has a capillary action. 2. The heat pipe according to claim 1, wherein the micro-recess is axially truncated, V-shaped, U-shaped, curved or trapezoidal. 3. The heat pipe of claim 1, wherein the diameter, depth and the distance between the adjacent depressions are both 2 to 50 nm. 4. The heat pipe according to claim 3, wherein the diameter and the depression of the micro-recess are preferably 10 to 40 nm. 5. If you want to cover the towel, please refer to the woman mentioned in the first item. The tube (4) has a sound-like powder material on the wall. s No, 6. The fresh-skinned material as described in claim 5, wherein the nano-powder material comprises cerium oxide, aluminum oxide or a combination thereof. 7. The heat pipe of claim 5, wherein the nano-powder material has a thickness of buckner. The heat pipe of claim 5, wherein the nano-powder material has a thickness of m nanometer. 75. The heat pipe of claim 1, wherein the working fluid comprises pure water, ammonia sterol, C13, and gamma.卞 10. The heat pipe of claim 9, wherein the working fluid advance comprises a thermally conductive material particle in the suspended liquid working fluid. 11. The heat pipe according to claim 10, wherein the heat conductive material particles comprise copper powder... a rice stone counter-actuator, a nano carbon ball or a carbon nanotube filled with a nano-sized copper powder, Nano carbon ball. 12. A method for preparing a heat pipe, comprising the steps of: providing a substrate; and in the substrate-table number sag, the diameter and depth of the micro-depression have a nanometer size, and the distance between the main and the concave sides of each adjacent side is Nano-size; the substrate is formed into a tubular shape so that the inner surface of the micro-recessed tube is formed; the county is evacuated and filled with a proper amount of crushed fluid, and finally at 10 1308952. 13. As claimed in the patent specification, 'iron or stainless steel . 9>V2>] 2% repair (more) is the replacement method of the heat pipe according to the item 12, wherein the substrate material comprises copper, 14. The method of preparing a heat pipe according to claim 12, wherein the method of small depression on the substrate_surface comprises nanoimprinting. 15. The method for preparing a heat pipe according to claim 2, wherein the nanocompression is: molding and imprinting. The method of preparing a heat pipe according to claim 15, wherein the embossing method is hot stamping. 17. The heat pipe preparation method according to claim 12, wherein a plurality of micro-pits are formed on the surface of the substrate, and then a layer of nano-powder material is formed on the surface. / The heat pipe preparation method according to Item 17, wherein the nano powder is dioxic and trioxide reduced in combination. 19. If the application of the refractory item is as follows, the thickness of the material is 1 to 20 nm. 20. The method of forming a tubular base into a tubular shape according to the method of claim 12, comprising rolling the substrate and welding. 11