TW201403016A - Heat pipe - Google Patents

Abstract

A heat pipe includes a cover and a wick structure. The cover defines a sealed cavity, and includes an inner surface. The wick structure is graphite structure.

Description

Heat pipe

The present invention relates to a heat transfer device, and more particularly to a heat pipe.

The heat pipe is a heat conduction element that realizes heat conduction by changing the phase of the working fluid inside the body, and has the characteristics of high thermal conductivity, excellent isothermal property, good heat conduction effect, and wide application. At present, heat pipes are widely used for heat dissipation of electronic components with large heat generation because of their relatively fast heat transfer rates.

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 led to a sharp increase in the heat generation per unit volume of electronic devices, and higher requirements for the thermal conductivity of heat pipes.

In view of this, it is necessary to provide a heat pipe having a high thermal conductivity.

A heat pipe comprising a casing and a capillary structure, the casing forming a closed chamber, the casing comprising an inner tube wall, the capillary structure being a graphite structure.

Since the heat pipe uses the graphite structure as a capillary structure, it is directly attached to the inner pipe wall of the metal casing. The use of graphite materials for the transfer of heat has superconducting properties, and the transfer of heat directly and more quickly inside the heat pipe increases the superconducting efficiency of the heat pipe itself. Therefore, the heat pipe has superior heat transfer performance in heat dissipation applications, and is suitable for a fast, large-scale heat dissipation environment.

Referring to FIG. 1, a schematic view of a heat pipe 10 according to a first embodiment of the present invention is shown. In the present embodiment, a plate-shaped tubular heat pipe 10 is taken as an example, but is not limited to a plate-type pipe. The heat pipe 10 includes a casing 12, a capillary structure 14 and a graphite structure 16. The outer casing 12 is made of a metal having good thermal conductivity such as copper, gold, silver, or aluminum. In the present embodiment, the material of the outer casing 12 is preferably metallic copper. A closed chamber 100 is formed within the metal casing 10 and includes an inner tube wall 120. The capillary structure 14 is in close contact with the inner tube wall 120 of the metal casing 10 and covers the inner tube wall 120 to avoid local overheating due to uneven bonding. The capillary structure 14 can be one of a groove, a wire mesh, or a sintered type. Among them, the wire mesh type capillary structure 14 is relatively easy to manufacture, and the material thereof is generally copper, stainless steel, barbed wire or the like. The grooved capillary structure 14 can have both axial grooves and circumferential grooves. The axial groove is formed by pressing and pulling the pin; the circumferential groove is generally formed into a thread type for easy processing. The sintered type capillary structure 14 is obtained by sintering a large amount of metal powder particles for filling. The graphite structure 16 is disposed on the capillary structure 14. In the present embodiment, the graphite structure 16 is in close contact with the capillary structure 14 in a sheet form, and its thickness is preferably 0.15 mm. The graphite structure 16 is entirely made of a graphite material. The graphite structure 16 serves as another capillary structure of the heat pipe 10, and is combined with the capillary structure 14 to form a composite capillary structure of the heat pipe 10 to facilitate heat transfer. Of course, the graphite structure 16 may exist in the shape of a circle, an ellipse or the like within the chamber 100. In addition, the graphite structure 16 may also be formed in the chamber 100 by means of grooves, vessels, or sintering.

A graphite structure 16 is provided in the outer casing 12 of the heat pipe 10. The superconducting property of the heat transfer by the graphite material increases the superconducting efficiency of the heat pipe 10 itself. Therefore, the heat pipe 10 has superior heat transfer performance in heat dissipation applications, and is suitable for a fast, large heat dissipation environment.

Referring to Figure 2, a schematic view of a heat pipe 10 in accordance with a second embodiment of the present invention is shown. The heat pipe 20 in this embodiment includes a metal casing 22 and a graphite structure 26. The metal casing 22 is identical in material and construction to the casing 12 of the first embodiment, and each forms a closed chamber 200 and includes an inner tube wall 220. The difference from the heat pipe 10 in the first embodiment is that the graphite structure 26 of the heat pipe 20 in the present embodiment is directly attached to the inner tube wall 220 as a capillary structure in the form of a graphite sheet, and the graphite structure 26 is entirely Made of graphite material. The graphite structure 26 covers the inner tube wall 220 to avoid local overheating due to uneven bonding. The graphite structure 26 is preferably a sheet having a thickness of 0.15 mm and is uniformly attached to the inner tube wall 220. The graphite structure 26 may exist in the shape of a circle, an ellipse or the like within the chamber 200. In addition, the graphite structure 26 may also be formed in the chamber 200 by means of grooves, vessels, or sintering.

Since the heat pipe 20 is formed by using the graphite structure 26 as a capillary structure, the graphite material has superconducting properties for heat transfer, so that the heat is more directly and more quickly transferred inside the heat pipe 20, increasing the heat pipe 20 itself. Guide performance. Therefore, the heat pipe 20 has superior heat transfer performance in heat dissipation applications, and is suitable for a fast, large-scale heat dissipation environment.

10, 20. . . Heat pipe

12, 22. . . metal shell

120. . . Inner wall

14. . . Capillary structure

16, 26. . . Graphite structure

100, 200. . . Chamber

Fig. 1 shows a schematic view of a heat pipe according to a first embodiment of the present invention.

Fig. 2 is a schematic view showing a heat pipe of a second embodiment of the present invention.

10. . . Heat pipe

12. . . metal shell

120. . . Inner wall

14. . . Capillary structure

16. . . Graphite structure

100. . . Chamber

Claims (10)

A heat pipe comprising a casing and a capillary structure, the casing forming a closed chamber, the casing comprising an inner tube wall, the improvement being that the capillary structure is a graphite structure. The heat pipe of claim 1, wherein the outer casing comprises an inner tube wall to which the graphite structure is attached. The heat pipe of claim 1, wherein: further comprising another capillary structure formed in the outer casing, the another capillary structure and the graphite structure together forming a composite capillary structure of the heat pipe. The heat pipe of claim 3, wherein the outer casing comprises an inner tube wall attached to the inner tube wall, and the graphite structure is attached to the other capillary structure. The heat pipe according to claim 3, wherein the another capillary structure is one of a groove, a wire mesh or a sintered type. The heat pipe of claim 1, wherein the graphite structure is formed in the chamber by a groove, a vessel or a sintering. The heat pipe according to claim 1, wherein the graphite structure is a graphite sheet having a thickness of 0.15 mm. The heat pipe according to claim 1, wherein the graphite structure is circular or elliptical. The heat pipe according to claim 1, wherein the metal casing is a copper pipe. The heat pipe according to claim 1, wherein the capillary structure is entirely made of a graphite material.