TWI458929B - Manufacturing method of heat pipe - Google Patents

Description

Heat pipe manufacturing method

The invention relates to a method of manufacturing a heat pipe.

At this stage, heat pipes have been widely used for heat dissipation of electronic components with large heat generation. When the heat pipe is in operation, the low-boiling working fluid filled inside the pipe body absorbs the heat generated by the heat-generating electronic component in the evaporation section, evaporates and vaporizes, moves with heat to the condensation section, and liquefies and condenses in the condensation section to release the heat. The liquefied working fluid is returned to the evaporation section under the action of the capillary structure of the heat pipe wall, and the heat generated by the electronic component is quickly transmitted to the radiator in contact with the condensation section of the heat pipe by the circulating motion of the working fluid. . When the capillary structure of the heat pipe cannot provide sufficient capillary force, the working fluid of the condensation section cannot be returned to the evaporation section in time, and the working fluid may be too small to be dried, thereby causing the heat pipe to lose heat transfer performance and causing the heat element to be Can not be cooled in time to burn.

In response to the increasing demand for the maximum heat transfer of electronic components, a variety of composite capillary structures have been developed, such as adding a second capillary structure to the capillary structure on the inner surface of the heat pipe body. The capillary structure may be a groove. a capillary structure, a wire mesh capillary structure or a sintered capillary structure, the second capillary structure may be a vessel, and the capillary structure is combined with the second capillary structure to generate more capillary force without causing Too much flow resistance.

However, in the prior art, the heat pipe for manufacturing the composite capillary structure is placed in the vessel. Usually, the vessel is usually inserted into the tube of the heat pipe at random, and the vessel generally cannot be directly attached to the capillary structure in the tube body along the axial direction of the tube body, so that the through hole in the vessel is not parallel with the tube body, and the working fluid is increased. The resistance to flow in the through hole greatly affects the ability of the vessel to transport fluid from the condensation section of the heat pipe to the evaporation section during operation. In addition, when a plurality of vessels are arranged in the same heat pipe, the vessels may overlap due to the inability to control their positions, and the plurality of vessels may not be surely attached to the capillary structure of the pipe body along the axial direction of the pipe body, which not only affects The fluid transport capacity of the vessel, and the steam flow path in the heat pipe is not smooth. Secondly, when used, it is often necessary to flatten the heat pipe and then contact the heat-generating electronic component. Since the direction in which the vessel extends in the pipe body, that is, the joint between the vessel and the capillary structure cannot be controlled, the heat pipe cannot be flattened. The entire vessel is precisely controlled on the wall of the tube in contact with the heat-generating electronic components in the future, causing a deviation between the performance of the heat pipe having the composite capillary structure.

In view of this, it is necessary to provide a heat pipe having a simple process technology and precisely controlling the position of the vessel.

A heat pipe manufacturing method comprising the steps of: providing a pipe body, a filling rod and at least one vessel, wherein the inner surface of the pipe body is provided with a capillary structure, the pipe body comprises an open end, and the outer surface of the filling rod is provided At least one groove; inserting the filling rod and the vessel into the tube, the vessel is received in the groove; and the tube body provided with the filling rod and the vessel is baked at a high temperature, so that The vessel and the capillary structure are combined with each other; the filling rod is extracted; the tube body is evacuated, injected, and sealed.

Compared with the prior art, the heat pipe is provided with a groove on the filling rod, so that the vessel in the composite capillary structure of the heat pipe and the capillary structure on the inner surface of the pipe have a certain fixed position, thereby eliminating heat regulation. After the formation, the position of the vessel is uncertain. Deviation in performance is caused, and the stability of the performance of the heat pipe having the composite capillary structure is improved.

10‧‧‧ tube body

11‧‧‧Open end

12‧‧‧Capillary structure

20, 20a‧‧‧Filling rod

21, 21a‧‧‧ Groove

30, 30a‧‧‧Vascular

31‧‧‧ center passage

32‧‧‧ wall

33‧‧‧ first joint

34‧‧‧Second junction

40‧‧‧ mark

50‧‧‧heat pipe

51‧‧‧Upper and lower surfaces

1 is a flow chart of a method of manufacturing a heat pipe in an embodiment of the present invention.

2 is an exploded view of a tube body, a filling rod, and a vessel in a method of manufacturing a heat pipe.

Figure 3 is a schematic view of the filling rod after it has been inserted into the tubular body.

Figure 4 is a schematic view of the vessel after it has been inserted into the tubular body.

Figure 5 is a cross-sectional view taken along line V-V of Figure 4;

Fig. 6 is a schematic view showing the setting of the mark outside the tube and the extraction of the filling rod from the tube body.

Figure 7 is a schematic view of the heat pipe after it has been flattened.

Figure 8 is a cross-sectional view taken along line VIII-VIII of Figure 7.

Fig. 9 is an exploded view of the tube body, the filling rod, and the vessel in the second embodiment of the heat pipe manufacturing method.

Hereinafter, the heat pipe manufacturing method of the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a flow chart showing a method of manufacturing a heat pipe, and a method of manufacturing the heat pipe will be described in detail below with reference to FIGS. 2 to 9.

First, please refer to FIG. 2 at the same time, a tube 10, a filling rod 20 and a vessel 30 are provided. The pipe body 10 is made of a hollow cylindrical metal casing made of a metal material having good heat conductivity such as copper. The tubular body 10 has a circular cross section, and both ends of the tubular body 10 are open ends. 11. A capillary structure 12 is laid on the inner surface of the tube 10. The capillary structure 12 may adopt a grooved capillary structure formed by directly forming a plurality of small axial grooves on the inner surface of the pipe body 10, a wire mesh capillary structure formed by braiding a metal copper mesh or a fiber bundle, or a ceramic powder may be selected. Or a metal powder such as copper powder or the like is formed into a sintered capillary structure through a sintering process. The filling rod 20 is a solid cylinder made of a high hardness, a high melting point, and a low activity metal material such as steel. The filling rod 20 is recessed inwardly from one side of the outer surface to form a recess 21. The groove 21 extends through the front and rear end faces of the filling rod 20 in the axial direction of the filling rod 20. The diameter of the filling rod 20 is substantially equal to the inner diameter of the tubular body 10 after the capillary structure 12 is disposed, and the length of the filling rod 20 is greater than the length of the tubular body 10. The vessel 30 is a flexible hollow tubular structure formed by weaving a pure copper wire having a wire diameter of about 0.05 mm. The width of the groove 21 is slightly larger than the diameter of the vessel 31, and the depth is slightly smaller than that of the vessel. The diameter of 31. The tube wall 32 of the vessel 30 is formed with a plurality of fine pores, and a central passage 31 is formed therein, and the pores on the tube wall 32 communicate with the central passage 31. The length of the vessel 30 is substantially equal to the length of the tubular body 10.

Referring to FIG. 3, the filling rod 20 is inserted into the tubular body 10 from the open end 11 of the tubular body 10. One end of the filling rod 20 projects from the open end 11 of the tubular body 10 beyond the tubular body 10. The outer surface of the filling rod 20 not provided with the groove 21 is in close contact with the capillary structure 12 in the tube body 10. If the capillary structure 12 is a wire mesh capillary structure or a sintered capillary structure, the filling rod 20 can provide appropriate pressure. The capillary structure 12 is forced to closely conform to the inner surface of the tube body 10, thereby increasing the tightness of the capillary structure 12 in contact with the tube body 10, so that heat can be smoothly transferred from the tube body 10 to the capillary structure 12.

Referring to Figure 4, the vessel 30 is inserted into the recess 21 of the filling rod 20 from the open end 11 of the tubular body 10 inwardly. Since the depth of the groove 21 is slightly smaller than the diameter of the vessel 30, when the vessel 30 is inserted into the groove 21, the vessel 30 is pressed by the filling rod 20 and the capillary structure 12. A slight deformation occurs. Therefore, the filling rod 20 can also provide appropriate pressure to increase the tightness of contact between the vessel 30 and the capillary structure 12, ensuring that the working fluid can be more smoothly transferred from the capillary structure 12 to the vessel 30. As shown in FIG. 5, the deformed vessel 30 has an elliptical cross section, and the upper and lower opposite sides of the vessel 30 are in contact with the capillary structure 12 and the surface of the filling rod 20 located in the groove 21 to form an arc. The first joint surface 33 and the second joint surface 34. Therefore, the contact area between the deformed elliptical vessel 30 and the capillary structure 12 is larger than the contact area of the undeformed circular vessel 30 and the capillary structure 12. Since the vessel 30 is axially attached to the capillary structure 12 to form a larger first joint surface 33, more pores in the tube wall 32 of the vessel 30 communicate with the pores in the capillary structure 12 to increase The overall capillary force of the composite capillary structure.

The tube body 10 provided with the filling rod 20 and the vessel 30 is placed in a high temperature furnace for high temperature baking, so that the tube wall 32 of the vessel 30 is chemically bonded to the capillary structure 12, and The vessel 30 and the capillary structure 12 are fixed to each other. The filling rod 20 ensures that during the high temperature baking process, the vessel 30 and the capillary structure 12 can be kept in close contact with each other in the axial direction of the tube body 10, thereby forming a defined linear fixed position.

Referring to Fig. 6, the filling rod 20 is withdrawn, and a mark 40 is provided on the outer surface of both end portions of the tube body 10 at a position corresponding to the vessel 20. The mark 40 may be a minute score which is formed on the outer surface of both end portions of the pipe body 10 and which is recognizable to the human eye by means of a dedicated knives. The mark 40 may also be formed only at one end of the outer surface of the tubular body 10. Since the vessel 30 and the capillary structure 12 in the tubular body 10 form a linear fixed position along the axial direction of the tubular body 10, the markings 40 at both ends or one end of the tubular body 10 can accurately determine the whole root. The position of the vessel 30 within the tubular body 10.

The tube 10 is subjected to vacuuming, liquid injection, sealing, etc. to obtain a finished heat pipe 50, and finally the heat pipe 50 is flattened at a position where the outer surface of the pipe body 10 is provided with the mark 40. The flat heat pipe 50 is required. The flattened flat heat pipe 50 includes planar upper and lower surfaces 51, and the mark 40 is located substantially at the center of the upper surface 51.

In use, the upper surface 51 of the flat heat pipe 50 having the indicia 40 can be directly attached to a heat-generating electronic component. In operation, as shown in FIG. 8, the vessel 20 is located at a central position of the upper surface 51 of the flat heat pipe 50, that is, at a position where the heat-generating electronic component is located, and the vessel 20 and the capillary structure 12 are attached to each other, and the wall 32 The upper pores communicate with the pores in the capillary structure 12 to form a composite capillary structure, and the vessel 20 is combined with the capillary structure 12 to maximize the maximum fluid transport efficiency of the composite capillary structure.

In the heat pipe manufacturing method, a linear fixing position can be formed between the vessel 30 and the capillary structure 12 in the heat pipe 50 by using the groove 21 on the filling rod 20, and the marking is made on the outer surface of the heat pipe 50. The manner of 40 enables the heat pipe 50 to accurately align the bonding position between the vessel 30 and the capillary structure 12 with the heat-generating electronic component during use or flattening, thereby effectively utilizing the vessel 30 and the capillary structure. The fluid transport efficiency of the resulting composite capillary structure. Different heat-generating electronic components have different sizes, hotspot positions, etc., and the use of the vessel 30 to face the hot spot of the heat-generating electronic component can maximize the fluid transfer efficiency of the composite capillary structure. Therefore, the filling rod 20 can be specially designed according to different heating electronic components. By opening the grooves 21 of different numbers, shapes and sizes on the outer surface of the filling rod 20, the plurality of blood vessels 30 can be simultaneously fixed to the heat pipe. A composite capillary structure suitable for special heat dissipation requirements is formed at a specific location within 50. FIG. 9 shows a second embodiment of the method for manufacturing a heat pipe according to the present invention. The filling rod 20a includes two grooves 21a at a first end and a groove 21a at an opposite second end, each groove 21a. Extending from the one end of the filling rod 20a toward the center of the filling rod 20a, the length of each groove 21a is smaller than the length of the filling rod 20a. In the heat pipe manufacturing process, the filling rod Each groove 21a of 20a can correspond to a vessel 30a. The composite capillary structure produced by the filling rod 20a comprises two vessels 30a at one end of the capillary structure 12 and a vessel at the other end. 30a. In addition to complementing the capillary force and fluid transport capability of the heat pipe 50, the composite capillary structure thus formed can also fix various vessels having complicated designs in the heat pipe 50.

In summary, the present invention conforms to the requirements of the invention patent, and proposes a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

Claims (10)

A heat pipe manufacturing method comprising the steps of: providing a pipe body, a filling rod and at least one vessel, wherein the inner surface of the pipe body is provided with a capillary structure, the pipe body comprises an open end, and the outer surface of the filling rod is provided At least one groove; inserting the filling rod and the vessel into the tube, the vessel is received in the groove; and the tube body provided with the filling rod and the vessel is baked at a high temperature, so that The vessel and the capillary structure are combined with each other; the filling rod is extracted; the tube body is evacuated, injected, and sealed; wherein the vessel is a hollow tubular structure formed by braiding a wire, and a central passage is formed therein. A plurality of pores are formed in the tube wall of the vessel, and the pores communicate with the central passage. The heat pipe manufacturing method according to claim 1, wherein the vessel is a hollow circular tubular structure formed by braiding, the width of the groove is larger than the diameter of the vessel, and the depth is smaller than The diameter of the vessel is deformed by the compression of the filling rod and the capillary structure, and the deformed vessel has an elliptical cross section. The heat pipe manufacturing method according to claim 1, wherein the groove extends in the axial direction of the filling rod and penetrates the front and rear end faces of the filling rod. The heat pipe manufacturing method according to claim 1, wherein the number of the grooves is plural and respectively located at both ends of the filling rod, and each groove extends from an end of the filling rod toward a center of the filling rod. The heat pipe manufacturing method according to claim 1, wherein the filling rod is made of a high hardness, a high melting point, and a low activity metal material. The heat pipe manufacturing method of claim 1, further comprising providing a mark on an outer surface of the pipe body at a position corresponding to the blood vessel. The heat pipe manufacturing method according to claim 6, wherein the mark is formed on an outer surface of both ends of the pipe body. The method of manufacturing a heat pipe according to claim 6, wherein the mark is a mark that is recognizable to the human eye. The heat pipe manufacturing method according to claim 6, further comprising flattening the heat pipe at a position where the outer surface of the pipe body is provided with a mark to obtain a flat heat pipe, wherein the flat heat pipe comprises a planar surface, and the mark is in a plane. The center of the surface. The heat pipe manufacturing method according to claim 1, wherein the diameter of the filling rod is equal to the inner diameter of the tubular body after the capillary structure is disposed, and the length of the filling rod is greater than the length of the tubular body.