WO2008131587A1

WO2008131587A1 - Heat pipe and manufacturing method thereof

Info

Publication number: WO2008131587A1
Application number: PCT/CN2007/001425
Authority: WO
Inventors: Jenshyan Chen
Original assignee: Jenshyan Chen
Priority date: 2007-04-28
Filing date: 2007-04-28
Publication date: 2008-11-06
Also published as: US20100108297A1

Abstract

A heat pipe and the method thereof are provided. The heat pipe (1) comprises a pipe body (12), a cavity (14) and a porous capillary diversion layer (18). The pipe body (12) has a first open (122) and a third open (124), and the cavity (14) has a second open (142). The first open (122) and the second open (142) are bonded together, and the third open (124) is sealed to form the heat pipe (1). The heat pipe comprises working liquid in it. The sectional area of the cavity (14) is larger than that of the pipe body (12). And the cavity (14) has a planar end (144).

Description

Heat pipe and manufacturing method thereof

Technical field

The present invention relates to a heat pipe and a method of manufacturing the same, and more particularly to a heat pipe for dissipating heat from a light emitting diode and a method of manufacturing the same. technical background

With the development of technology, the technology of many electronic products cannot be broken due to the problem of heat dissipation. For example, a computer central processor generates a large amount of heat during operation, and if this heat cannot be discharged, it will adversely affect the operation of the entire system. The heat pipe plays an important role in the heat dissipation portion of the computer's central processing unit. Especially in electronic devices where the available space is increasingly narrow, heat sinks that can effectively dissipate heat while making full use of space are more important.

Most of the existing heat pipe heat dissipation methods are formed by inserting a plurality of heat pipes in a metal medium to form a heat conducting surface on the metal medium. However, the heat generated by the electronic components mounted on the heat conducting surface needs to pass through the metal medium to be indirectly conducted to the heat pipe. Therefore, the heat dissipation efficiency of the heat dissipation method is limited by the metal medium. The physical properties are not easy to improve. If the electronic component is directly mounted on the heat pipe, the heat pipe in the general electronic device has a limited diameter and cannot carry a relatively large diameter electronic component or a clustered electronic component. If a vapor chamber is used directly, the problem of narrowing the installation area can be solved, but additional means are needed to discharge heat from the electronic component, such as a heat sink. Moreover, the space required for the heat sink and the heat sink is still too large for an electronic device having a small idle space.

Therefore, how to provide a heat pipe having different cross-sectional areas and a manufacturing method thereof can provide an effective and rapid heat dissipation method for an electronic component or a clustered electronic component having a large heat-generating area to solve the above problem, and become a researcher One of the problems that need to be solved. Summary of invention

1

Confirmation It is an object of the present invention to provide a heat pipe having different cross-sectional areas for heat dissipation of a light-emitting diode and a method of manufacturing the same.

To achieve the above object, the heat pipe provided by the present invention comprises a tube body, a cavity and a porous capillary flow guiding layer. The tube body has a first opening, and the tube body has a diameter of less than 10 mm. The cavity has a second opening, and the second opening is engaged with the first opening, thereby forming a sealed space between the tube and the cavity. The porous capillary flow guiding layer is formed inside the tubular body and the cavity. Wherein the sealed space accommodates a working fluid, and a cross-sectional area of the cavity is larger than a cross-sectional area of the tubular body. '

In a specific embodiment, the tubular body is integrally formed with the cavity. In another embodiment, the cavity is formed by a recess and an upper cover. The upper cover engages the recess and has the second opening. The groove may be formed by a powder metallurgy process, a stamping process, an injection molding process, a casting process or a machining process. In a specific embodiment, the cavity has a flat end for placement by a general electronic component.

In a specific embodiment, the porous capillary flow guiding layer may be sintered by a copper metal powder, a nickel metal powder, a silver metal powder, a metal powder coated with copper, nickel or silver or other similar metal powder. to make.

In another embodiment, the porous capillary flow guiding layer comprises a layer of metal particles and a metal mesh. The metal particle layer is sintered and formed on an inner wall of the tube body and an inner wall of the cavity, and the metal mesh body is disposed on the metal particle layer.

In another embodiment, the porous capillary flow guiding layer comprises a corrugated folded metal cloth and a flat metal mesh layer, and the corrugated folded metal cloth is laid on the inner wall of the tubular body and the cavity. The inner wall, and the flat metal mesh layer are disposed on the corrugated metal cloth. The corrugated shape of the corrugated metal cloth may be triangular, rectangular, trapezoidal or wavy.

In another embodiment, the porous capillary flow guiding layer comprises a plurality of fine scores formed on an inner wall of the tubular body and an inner wall of the cavity.

In another specific embodiment, the porous capillary flow guiding layer comprises a plurality of fine nicks and a gold It is a sintered layer, the fine notch is formed on the inner wall of the cavity, and the metal sintered layer is formed on the inner wall of the pipe body and is welded to the fine notch.

The heat pipe manufacturing method provided by the present invention comprises the following steps: (a) providing a pipe body having a first opening and a third opening; (b) providing a cavity having a second opening; (c) a first opening of the tubular body sealingly engages a second opening of the cavity to form a half finished heat pipe; (d) pumping the semi-finished heat pipe; and (e) sealing the third opening . Wherein the inner wall of the semi-finished heat pipe comprises a porous capillary flow guiding layer, the semi-finished heat pipe accommodating a working fluid, and a cross-sectional area of the cavity is larger than a cross-sectional area of the pipe body. And, the working fluid is injected into the semi-finished heat pipe before or after step (d). In addition, the sealing joint in the step (c) is a welding process, a welding process, a mechanical fastening process or a gluing process.

The step (b) of the heat pipe manufacturing method provided by the present invention may include: providing a groove; providing an upper cover, the upper cover having the second opening; and engaging the upper cover with the groove to The cavity is formed. The groove may be formed by a powder metallurgy process, a stamping process, an injection molding process, a casting process or a machining process. And forming a first sintered metal layer on the groove, a second sintered metal layer is formed on the upper cover, and the first sintered metal layer is in contact with the second sintered metal layer. Or forming a first plurality of fine nicks on the groove, and forming a second plurality of fine nicks on the upper cover, the first plurality of small nicks and the second plurality of small nicks Scotch convergence. The porous capillary flow guiding layer is formed by joining with the tubular body.

In a specific embodiment, a sintered metal powder layer is formed on the inner wall of the cavity. The porous capillary flow guiding layer is formed by inserting a center rod from the third opening into the semi-finished heat pipe and substantially abutting the sintered metal powder layer; the center rod and the semi-finished product Filling a first metal powder between the heat pipes; performing a sintering process to fuse the first metal powder with the sintered metal powder layer to form the porous capillary flow guiding layer; and The rod is removed from the semi-finished heat pipe.

In another embodiment, the cavity has a plurality of fine scores on the inner wall. The porous capillary flow guiding layer is formed by inserting a center rod from the third opening into the semi-finished product heat Inside the conduit and substantially abutting the plurality of fine scores; filling a second metal powder between the center rod and the semi-finished heat pipe; performing a sintering process to make the second metal powder and the A plurality of fine scores are welded to form the porous capillary flow guiding layer; and the center rod is removed from the semi-finished heat pipe. In the above two specific embodiments, the first metal powder or the second metal powder may be a copper metal powder, a nickel metal powder, a silver metal powder, a metal plated with copper, nickel or silver. Powder or other similar metal powder.

In another embodiment, the porous capillary flow guiding layer utilizes a machining process to create a plurality of fine scores on the inner wall of the tubular body and the inner wall of the cavity to form the porous capillary guide. Stream layer.

In another embodiment, the porous capillary flow guiding layer is formed by: sintering a plurality of metal particles on an inner wall of the tubular body and an inner wall of the cavity; and providing a metal mesh body in the On the metal particles to form the porous capillary flow guiding layer.

In another embodiment, the porous capillary flow guiding layer is formed by: laying a corrugated folded metal cloth on the inner wall of the tubular body and the inner wall of the cavity; and providing a flat metal mesh layer The corrugated folded metal cloth is formed to form the porous capillary flow guiding layer.

Another heat pipe manufacturing method provided by the present invention comprises the following steps: (A) providing a first pipe body having an opening and a closed end; (B) necking the first pipe body to form a communication a cavity and a second tube, wherein the cavity includes the closed end, the second tube includes the opening; (C) pumping the cavity and the second tube And (D) sealing the opening; wherein the cavity and the inner wall of the second tube body comprise a porous capillary flow guiding layer, the cavity and the second tube body accommodating a working fluid, The cross-sectional area of the cavity is larger than the cross-sectional area of the second pipe body. Wherein step (B) is carried out at a temperature in the range of from 400 to 600 °C.

In a specific embodiment, after step (A), the porous capillary flow guiding layer is formed on the inner wall of the first tubular body. The porous capillary flow guiding layer is formed by: placing a first metal powder in the first tube; inserting a center rod from the opening into the first tube body and substantially abutting the first tube a metal powder; filling a second between the center rod and the inner wall of the first tube a metal powder; performing a sintering process to fuse the first metal powder with the second metal powder to form the porous capillary flow guiding layer; and removing the center rod from the first tube.

The technical effect of the present invention is to provide a heat pipe having different sectional areas and a manufacturing method thereof, and an electronic component or a clustered electronic component having a large heat generating area can be disposed on a flat end of the heat pipe, and An efficient and rapid cooling mode of the electronic component is provided. ' Description of the drawings

Figure 1 is an exploded cross-sectional view of the first preferred embodiment before the heat pipe is completed;

2A is a cross-sectional view of the half-finished heat pipe of the first preferred embodiment;

Figure 2B is a cross-sectional view of the first preferred embodiment of the center rod inserted into the semi-finished heat pipe; Figure 2C is the first preferred embodiment between the center bar and the semi-finished heat pipe Filling in a cross-sectional view of a first metal powder;

Figure 2D is a cross-sectional view of the semi-finished heat pipe of the first preferred embodiment;

Figure 2E is a cross-sectional view of the heat pipe of the first preferred embodiment;

3A is a partial cross-sectional view of a first opening and a second opening of a heat pipe according to an embodiment; FIG. 3B is a first opening of the heat pipe of the embodiment bonded to a second opening; Partial cross-sectional view;

3C is a partial cross-sectional view showing a first opening and a second opening of the heat pipe of another embodiment; FIG. 3D is a first opening of the heat pipe of the embodiment bonded to a second opening; Partial cross-sectional view;

Figure 3E is a cross-sectional view of the heat pipe cavity of the above specific embodiment;

4A is a cross-sectional view of a half-finished heat pipe of a second preferred embodiment;

Figure 4B is a cross-sectional view showing the center rod of the second preferred embodiment inserted into the semi-finished heat pipe; Figure 4C is the second preferred embodiment between the center bar and the semi-finished heat pipe Filling in a cross-sectional view of a second metal powder; '

Figure 4D is a cross-sectional view of the heat pipe of the second preferred embodiment; _4E is a cross-sectional view of a specific embodiment before the heat pipe is completed;

Figure 4F is a cross-sectional view of the heat pipe of the specific embodiment before it is completed;

Figure 4G is a cross-sectional view of the heat pipe of the specific embodiment;

Figure 4H is a cross-sectional view of the cavity of the heat pipe of the above specific embodiment;

Figure 5 is a cross-sectional view of a heat pipe of a third preferred embodiment;

Figure 6 is a cross-sectional view of a heat pipe of a fourth preferred embodiment;

Figure 7 is a cross-sectional view showing a heat pipe of a fifth preferred embodiment;

Figure 8A is a cross-sectional view showing a first tube body of a heat pipe of a sixth preferred embodiment;

Figure 8B is a cross-sectional view of the first tube body after necking according to the sixth preferred embodiment;

Figure 8C is a cross-sectional view of the heat pipe of the sixth preferred embodiment;

Figure 8D is a cross-sectional view showing the first tube body of the sixth preferred embodiment in which a first metal powder is placed;

Figure 8E is a cross-sectional view of the sixth preferred embodiment in which a center rod is placed on the first tube; Figure 8F is the sixth preferred embodiment of the center rod and the first tube a schematic cross-sectional view of interposing a second metal powder between the bodies;

Figure 8G is a cross-sectional view of the first tube body of the sixth preferred embodiment. Summary of the invention

The above and other objects, features and advantages of the present invention will become more apparent from

Please refer to FIG. 1. FIG. 1 is an exploded cross-sectional view of the heat pipe 1 according to a first preferred embodiment of the present invention before it is completed. The heat pipe 1 comprises a tube body 12 and a cavity 14. The tube body 12 has a first opening 122 and a third opening 124. The cavity 14 has a second opening 142 and a flat end 144. A cross-sectional area of the cavity 14 is greater than a cross-sectional area of the tubular body 12. Wherein the cross-sectional area of the cavity 14 refers to the cross-sectional area of the cavity 14 near the flat end 144. The tubular body 12 has a diameter of less than 10 mm. As shown in FIG. 2A, the second opening 142 of the cavity 14 is sealingly engaged with the first opening 122 of the tubular body 12 to form a half finished heat pipe 16. The sealing joint may be a welding process, a welding process, a mechanical fastening process or a gluing process.

In the first preferred embodiment, a sintered metal powder layer 182 is formed on the inner wall of the cavity 14, as shown in Fig. 2A. After the sealing engagement, a center rod C1 is inserted from the third opening 124 into the semi-finished heat pipe 16 and substantially abuts the sintered metal powder layer 182, as shown in Fig. 2B. A first metal powder 184 is then filled between the center rod C1 and the semi-finished heat pipe 16, as shown in Figure 2C. The first metal powder 184 may be a copper metal powder, a nickel metal powder, a silver metal powder, a metal powder plated with copper, nickel or silver or the like.

As shown in Fig. 2D, a sintering process is then performed to splicing the first metal powder 184 with the sintered metal powder layer 182 to form a porous capillary flow guiding layer 18. Finally, the center rod C1 is taken out of the semi-finished heat pipe 16. As shown in Fig. 2E, the semi-finished heat pipe 16 is evacuated and a working fluid L1 is injected before the third opening 124 is sealed. The order in which the working fluid L1 is injected and the pumping is exchanged. In order for the subsequent sealing to be carried out smoothly, the third opening 124 may be shrunk before pumping. Finally, the heat pipe 1 is completed after the third opening 124 is sealed.

It should be noted that the sealing engagement should avoid excessive damage to the existing porous capillary flow guiding layer. In the first preferred embodiment, the second opening 142 of the cavity 14 is free of the sintered metal powder layer 182 (please refer to the figure so that the sealing joint can be used without regard to the sintering during the bonding process). The metal powder layer 182 causes damage, for example, using a general welding process or a welding process. However, it should be noted that after the sealing engagement, the inner wall of the cavity 14 and the inner wall of the pipe body 12 should be as The smooth connection is maintained so that the subsequent first metal powder 184 can be sintered smoothly and fused with the sintered metal powder layer 182 to form the porous capillary flow guiding layer 18.

In addition, if the sintered metal powder layer 182 is present at the second opening 142 of the cavity 14, the bonding process used is limited, or the use conditions are limited. For example, in this embodiment It is not advisable to use the welding process or the welding process directly. However, a fusion bonding process or a soldering process can be used by a suitable joint design. Referring to FIG. 3A, FIG. 3A is a partial cross-sectional view of the first opening 122 and the second opening 142 according to an embodiment. The first opening 122 includes a joint plane 1222 and a weld portion 1224. The second opening 142 includes a joint plane 1422 and a weld portion 1424. The joint planes 1222, 1422 are in close contact with each other. The welded portions 1224, 1424 are all inclined surfaces. When the joining planes are fitted, the welded portions 1224, 1424 form a groove for the filler to be welded. As shown in FIG. 3B, after the sealing joint is completed, only the soldering portions 1224, 1424 are affected, which is filled with a solder P, and the bonding planes 1222, 1224 are unaffected, thereby maintaining the cavity. The inner wall of the body 14 is smoothly connected to the inner wall of the tubular body 12 and does not damage the sintered metal powder layer 182 at the second opening 142 of the cavity 14.

In addition, please refer to FIG. 3C, which is a partial cross-sectional view of the first opening 122 and the second opening 142 of another embodiment. The first opening 122 includes a joint plane 1222 and a weld portion 1224. The second opening 142 includes a joint plane 1422 and a weld portion 1424. The welded portions 1224, 1424 are each composed of a raised portion 1224a, 1424a and a recess 1224b, 1424b. After the bonding planes are bonded, the bonding planes 1222, 1422 are in close contact with each other, and the protruding portions 1224a, 1424a are fused to each other by heating or other melting means, and fill the grooves 1224b, 1424b. After the sealing engagement is completed, only the welded portions 1224, 1424 are affected, and the joint planes 1222, 1224 are unaffected, thereby maintaining the inner wall of the cavity 14 and the inner wall of the tubular body 12 smooth. The sintered metal powder layer 182 at the second opening 142 of the cavity 14 is joined and does not damage, as shown in Figure 3D. The dashed circle in Fig. 3D indicates the welded region of the splicing portions 1224, 1424. Of course, if the first opening 122 and the second opening 142 are bolted, the above-mentioned influence due to heat will not exist, but attention should be paid to the sealing property of the joint.

It should be noted that, in the above specific embodiment, as shown in FIG. 3E, the cavity 14 may include a recess 146 and an upper cover 148. The groove 146 includes the flat end 144, and the upper cover 148 includes the second opening 142. Forming a first sintered metal layer on the groove 146 A second sintered metal layer 1824 is formed on the upper cover 148 of 1822 ₀ . The cavity 146 is engaged with the upper cover 148 to form the cavity 14, and the first sintered metal layer 1822 and the second sintered metal layer 1824 form the sintered metal powder layer 182. . In addition, the recess 146 itself may be made by a powder metallurgy process, a stamping process, an injection molding process, a casting process or a machining process.

Referring to Figure 4, Figure 4A is a cross-sectional view of the heat pipe 2 of a second preferred embodiment before it is completed. The heat pipe 2 is constructed in substantially the same manner as the heat pipe 1 of the first preferred embodiment and will not be described again. Only the manner in which the porous capillary guide layer 28 of the heat pipe 2 is formed will be described in detail.

As shown in Fig. 4A, the inner wall of the cavity 24 of the heat pipe 2 has a plurality of fine scores 282 thereon. As shown in Fig. 4A, a center rod C2 is inserted from the third opening 224 of the tubular body 22 of the heat pipe 2 into the half of the finished heat pipe 26 and substantially abuts the plurality of fine scores 282. As shown in Fig. 4C, a second metal powder is further filled between the center rod C2 and the semi-finished heat pipe 26. A sintering process is then performed to fuse the second metal powder 284 with the plurality of fine scores 282 to form the porous capillary flow director layer 28. Finally, the center rod C2 is removed from the semi-finished heat pipe 26 as shown in Fig. 4D. And after sealing the third opening 224, the heat pipe 2 is formed.

It should be noted that the center rod C2 does not have to have only one outer diameter, that is, the center rod C2 may have different outer diameters. Referring to FIG. 4A, FIG. 4A is a cross-sectional view of the heat pipe 2' of an embodiment before being completed. Compared with the second preferred embodiment, the plurality of fine scores 282' of the cavity 24' of the heat pipe 2' exhibit an inner diameter which is the same as the inner diameter of the tubular body 22' of the heat pipe 2'. Therefore, a center rod having only a single outer diameter cannot simultaneously satisfy the plurality of fine scores 282' and leave a space between the center rod and the heat pipe .2'-semi-finished heat pipe 26'. The requirement to accommodate the later added metal powder. In this case, a center rod C2' needs to have a different outer diameter such that a portion of the center rod C2' can abut the plurality of fine scores 282' and between the center rod C2' and the heat pipe 2' Space is left to accommodate the second metal powder 284' added later, and in the subsequent sintering In the art, the second metal powder 284' may be fused with the plurality of fine scores 282' to form a porous capillary guide layer 28', as shown in FIG. 4F. And after sealing the semi-finished heat pipe 26', the heat pipe 2' is formed as shown in Fig. 4G.

It should be noted that in the above specific embodiment, as shown in FIG. 4H, the cavity 24, 24' may include a recess 246 and an upper cover 248. The upper cover 248 includes a second opening 242 of the cavity 24. A first plurality of fine scores 2822 are formed on the groove 246. A second plurality of fine scores 2824 are formed on the upper cover 248. Forming the groove 246 with the upper cover 248 to form the cavity 24, 24', and the first plurality of fine scores 2822 and the second plurality of small scores 2824 are formed A few small fine marks 282 are described. Alternatively, the recess 246 housing itself may be formed by a powder metallurgy process, a stamping process, an injection molding process, a casting process, or a machining process.

Referring to Figure 5, Figure 5 is a cross-sectional view of a heat pipe 3 of a third preferred embodiment. The heat pipe 3 is basically made in the same manner as the heat pipe 1 of the first preferred embodiment, and will not be described again. Only the manner in which the porous capillary guide layer 38 of the heat pipe 3 is formed will be described. The porous capillary deflector 38 utilizes a machining process to create a plurality of fine scores 38 on the inner wall of a tubular body 32 of the heat pipe 3 and on the inner wall of a cavity 34 of the heat pipe 3. To form. The plurality of fine scores 38 are scored directly on the inner wall of the semi-finished heat pipe, for example, using a cutter. It should be noted that in one embodiment, the cavity of the half of the finished heat pipe has a plurality of small scores originally, so that after the sealing joint, only a few small scores are formed on other parts of the inner wall of the semi-finished heat pipe. A porous capillary flow guiding layer can be formed, but attention should be paid to the connection of the two sets of fine nicks. Such a cavity is more common in a combined cavity, such as a combination of a recess and an upper cover.

Please refer to FIG. 6. FIG. 6 is a cross-sectional view of a heat pipe 4 according to a preferred embodiment. The heat pipe 4 is manufactured in substantially the same manner as the heat pipe 1 of the first preferred embodiment, and details are not described herein. Only the manner in which the porous capillary guide layer 48 of the heat pipe 4 is formed will be described. A plurality of metal particles 482 are first sintered on the inner wall of the tube body 42 of the heat pipe 4 and on the inner wall of the cavity 44 of the heat pipe 4. The metal particles 482 are further disposed on a metal mesh 484 to form the porous Capillary baffle 48. It should be noted that the plurality of gold particles 482 may be sintered to the inner wall of the tube body 42 and the inner wall of the cavity 44, respectively.

Referring to Figures 7, Figure 7 is a cross-sectional view of a heat pipe 5 of a fifth preferred embodiment. The heat pipe 5 is generally manufactured in the same manner as the heat pipe 1 of the first preferred embodiment, and will not be described herein. Only the manner in which the porous capillary guide layer 58 of the heat pipe 5 is formed will be described. A corrugated metal cloth 582 is first laid on the inner wall of the tube 52 of the heat pipe 5 and on the inner wall of the cavity 54 of the heat pipe 5. The corrugated folded metal cloth 582 is placed on a flat metal mesh layer 584 to form the porous capillary flow guiding layer 58. The corrugated shape of the corrugated folded metal cloth 582 may be triangular, rectangular, trapezoidal or wavy.

Referring to Fig. 8A, Fig. 8A is a cross-sectional view showing the first tube body 62 of the heat pipe 6 of a sixth preferred embodiment. The first tubular body 62 has an opening 622 and a closed end 624. The closed end 624 is flat. The first tubular body 62 has a larger inner diameter for subsequent necking. And, because the wall of the first tubular body 62 that is tightened in the necking process will thicken after the necking, the sealing of the first tubular body 62 in a general application The wall thickness of the end 624 is mostly thicker than the wall thickness before the necking, so that the wall thickness after necking is uniform overall. But should not be limited to this.

The first tubular body 62 is then necked to form a cavity 626 and a second tubular body 628 that are in communication, as shown in Figure 8B. Wherein the cavity 626 includes the closed end 624, and the second body 628 includes the opening 622. A cross-sectional area of the cavity 626 is greater than a cross-sectional area of the second tubular body 628. The cross-sectional area of the cavity 626 refers to the cross-sectional area of the closed end. Additionally, the inner walls of the cavity 626 and the second tubular body 628 include a porous capillary flow guiding layer 64.

The cavity 626 and the second tube 628 are again evacuated, and a working fluid L2 is injected into the cavity 626 and the second tube 628. Finally, the opening 622 is sealed. The order in which the working fluid L2 is injected and the pumping is exchanged. After sealing the opening 622, the heat pipe 6 is completed as shown in Fig. 8C.

In the sixth preferred embodiment, the necking is performed at a temperature of 400 to 600 ° C or at a temperature higher than a recrystallization temperature of the first tube 62 by about 200 ° C. Implementation within scope Thermal processing. In addition, the porous capillary flow guiding layer 64 forms the porous capillary flow guiding layer 64 on the inner wall of the first tubular body 62 before the necking, the steps of which are as follows: in the first tubular body 62 A first metal powder 642 is built in, as shown in FIG. 8D; a center rod C3 is inserted into the first tube body 62 from the opening 622 and substantially abuts the first metal powder 642, as shown in FIG. 8E. Inserting a second metal powder 644 between the center rod C3 and the inner wall of the first tube body 62; performing a sintering process to weld the first metal powder 642 with the second metal powder 644, Thereby, the porous capillary flow guiding layer 64 is formed; and the center rod C3 is taken out from the first tubular body 62 as shown in Fig. 8G.

In the above specific embodiment, the tubular body and the cavity are connected in a symmetrical manner. In practical use, the tubular body and the cavity may also be connected in an asymmetric manner. For example, the tubular body is attached to the cavity near the edge to accommodate different space constraints.

In summary, the present invention provides a heat pipe having different cross-sectional areas and a method of manufacturing the same, and an electronic component or a cluster of electronic components having a large heat generating area may be disposed on a flat end of the heat pipe, and An efficient and rapid cooling mode of the electronic component is provided.

The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the embodiments, and various equivalent modifications or substitutions can be made by those skilled in the art without departing from the spirit of the invention. Such equivalent modifications or alternatives are intended to be included within the scope of the claims.

Claims

Rights request

A heat pipe, suitable for heat dissipation of an LED, characterized in that: the heat pipe comprises: a pipe body, the pipe body has a first opening, the pipe body has a diameter of less than 10 mm;

a cavity, the cavity has a second opening, the second opening is engaged with the first opening, and the tube body forms a sealed space with the cavity;

a porous capillary flow guiding layer formed in the tubular body and the cavity;

Wherein the sealed space accommodates a working fluid, and a cross-sectional area of the cavity is larger than a cross-sectional area of the tubular body.

2. The heat pipe according to claim 1, wherein the pipe body is integrally formed with the cavity.

3. The heat pipe of claim 1 wherein said cavity includes a recess and an upper cover, said upper cover engaging said recess and having said second opening.

4. The heat pipe according to claim 3, wherein the groove is made by a powder metallurgy process, a stamping process, an injection molding process, a casting process or a machining process.

5. The heat pipe of claim 1 wherein said cavity has a flat end.

6. The heat pipe according to claim 1, wherein the porous capillary flow guiding layer is made of a copper metal powder, a nickel metal powder, a silver metal powder, and a surface plated with copper, nickel or silver. Metal powder or other similar metal powder is sintered.

The heat pipe according to claim 1, wherein the porous capillary flow guiding layer comprises a metal particle layer and a metal mesh body, and the metal particle layer is sintered and formed on an inner wall of the pipe body and The inner wall of the cavity, and the metal mesh body are disposed on the metal particle layer.

The heat pipe according to claim 1, wherein the porous capillary flow guiding layer comprises a corrugated metal cloth and a flat metal mesh layer, and the corrugated metal cloth is laid on the pipe body. The inner wall and the inner wall of the cavity, and the flat metal mesh layer are disposed on the corrugated folded metal cloth.

The heat pipe according to claim 8, wherein the corrugated shape of the corrugated metal cloth is triangular, rectangular, trapezoidal or wavy.

The heat pipe according to claim 1, wherein said porous capillary flow guiding layer comprises a plurality of fine scores formed on an inner wall of said tubular body and an inner wall of said cavity.

The heat pipe according to claim 1, wherein the porous capillary flow guiding layer comprises a plurality of fine scores and a metal sintered layer, and the fine score is formed on an inner wall of the cavity. And the metal sintered layer is formed on an inner wall of the tube body and welded to the fine notch.

12. A method of manufacturing a heat pipe, comprising the steps of:

(a) providing a tubular body having a first opening and a third opening;

(b) providing a cavity having a second opening;

(c) sealingly engaging the first opening of the tubular body with the second opening of the cavity to form a semi-finished heat pipe;

(d) pumping the semi-finished heat pipe;

(e) sealing the third opening;

The inner wall of the semi-finished heat pipe comprises a porous capillary flow guiding layer, and the semi-finished heat pipe accommodates a working fluid, and a cross-sectional area of the cavity is larger than a cross-sectional area of the pipe body.

13. The method of claim 12 wherein said cavity has a flat end.

14. The method of claim 12, wherein the step (c) of the sealing joint is performed by a welding process, a welding process, a mechanical fastening process, or a gluing process.

15. The method of claim 12 wherein said working fluid is injected into said semi-finished heat conduit before or after step (d).

16. The method according to claim 12, wherein a sintered metal powder layer is formed on an inner wall of the cavity, and the porous capillary flow guiding layer is formed by the following steps:

Inserting a center rod from the third opening into the semi-finished heat pipe and substantially abutting the sintered metal powder layer;

Filling a first metal powder between the center rod and the semi-finished heat pipe; Performing a sintering process to fuse the first metal powder with the sintered metal powder layer to form the porous capillary flow guiding layer;

The center rod is removed from the semi-finished heat pipe.

17. The method of claim 12, wherein the inner wall of the cavity has a plurality of fine scores, and the porous capillary flow guiding layer is formed by the following steps:

Inserting a center rod from the third opening into the semi-finished heat pipe and substantially abutting the plurality of fine scores;

Filling a second metal powder between the center rod and the semi-finished heat pipe;

Performing a sintering process to fuse the second metal powder with the plurality of fine scores to form the porous capillary flow guiding layer;

The center rod is removed from the semi-finished heat pipe.

The method according to claim 16 or 17, wherein the first metal powder or the second metal powder may be a copper metal powder, a nickel metal powder, a silver metal powder, and a surface plating. There are metal powders of copper, nickel or silver or other similar metal powders.

19. The method of claim 12 wherein said porous capillary drainage layer is formed by the following steps:

A plurality of fine scores are formed on the inner wall of the tubular body and the inner wall of the cavity by a machining process to form the porous capillary flow guiding layer.

20. The method of claim 12, wherein the porous capillary flow guiding layer is formed by the following steps:

Sintering a plurality of metal particles on an inner wall of the tube body and an inner wall of the cavity;

A metal mesh body is disposed on the metal particles to form the porous capillary flow guiding layer.

21. The method of claim 12 wherein said porous capillary drainage layer is formed by the following steps:

Laying a corrugated metal cloth on the inner wall of the tube body and the inner wall of the cavity; and providing a flat metal mesh layer on the corrugated metal cloth to form the porous capillary flow Floor.

22. The method of claim 12, wherein step (b) comprises providing a recess;

Providing an upper cover, the upper cover having the second opening, and

The upper cover is engaged with the recess to form the cavity.

The method according to claim 22, wherein a first sintered metal layer is formed on the groove, and a second sintered metal layer is formed on the upper cover, the first sintered metal layer and the The second sintered metal layer is joined.

The method according to claim 22, wherein a first plurality of fine nicks are formed on the groove, and a second plurality of fine nicks are formed on the upper cover, the first number A small score is joined to the second plurality of fine scores.

25. The method of claim 22, wherein the recess is formed by a powder metallurgy process, a stamping process, an injection molding process, a casting process, or a machining process.

26. A method of manufacturing a heat pipe, comprising the steps of:

(A) providing a first tube body having an opening and a closed end;

(B) necking the first tubular body to form a cavity and a second tubular body, wherein the cavity comprises the closed end, and the second tubular body comprises the opening;

(C) pumping the cavity and the second tube; and

(D) sealing the opening;

Wherein the cavity and the inner wall of the second tube body comprise a porous capillary flow guiding layer, the cavity body and the second tube body accommodating a working fluid, and a cross-sectional area of the cavity body is larger than the The cross-sectional area of the second tube.

27. The method of claim 26 wherein said closed end is flat.

The method according to claim 26, wherein the step (B) is carried out at a temperature of from 400 to 600 °C.

The method according to claim 26, further comprising: After the step (A), the porous capillary flow guiding layer is formed on the inner wall of the first tube.

30. The method of claim 29, wherein the porous capillary drainage layer is formed by the following steps:

Inserting a first metal powder into the first tube;

Inserting a central rod from the mouth into the first tube and substantially abutting the first metal powder; filling a second metal powder between the center rod and the inner wall of the first tube;

Performing a sintering process to fuse the first metal powder with the second metal powder to form the porous capillary flow guiding layer;

The center rod is taken out of the first tube.