CN102778156A - Thin heat pipe structure and manufacturing method thereof - Google Patents

Abstract

A thin heat pipe structure and a manufacturing method thereof, the thin heat pipe structure comprising: a tube body and a grid body, the tube body having a chamber and at least one first groove, at least one second groove and a working fluid, the first and second grooves extending alternately with each other; the grid body is attached to the inner wall of the chamber; the present invention allows the heat pipe to conduct heat in both the axial and radial directions, and the manufacturing method can achieve thinning of the heat pipe and greatly improve the yield rate of the manufacturing process.

Description

Thin heat pipe structure and manufacturing method thereof

technical field

The present invention relates to a thin heat pipe structure and its manufacturing method, in particular to a thin heat pipe that increases the vapor-liquid diffusion efficiency by opening interlaced grooves on the inner pipe wall of the heat pipe so that the heat pipe can conduct heat in both the axial and radial directions. structure and method of manufacture.

Background technique

The apparent thermal conductivity of the heat pipe is several times to tens of times that of metals such as copper and aluminum, and is quite excellent, so it is used as a cooling element for various heat countermeasures related equipment. In terms of shape, heat pipes can be divided into round pipe-shaped heat pipes and planar-shaped heat pipes. In order to cool parts to be cooled in electronic equipment such as CPUs, planar heat pipes are preferably used from the viewpoint of being easy to install on the parts to be cooled and obtaining a wide contact area. Along with miniaturization and space saving of cooling mechanisms, in the case of cooling mechanisms using heat pipes, thinning of the heat pipes is also required.

A space is provided inside the heat pipe as a flow path for the working fluid, and the working fluid accommodated in the space transfers heat through phase change and movement such as evaporation and condensation. Next, the operation of the heat pipe will be described in detail. The heat pipe has a sealed cavity, and transfers heat by phase change and movement of a working fluid contained in the cavity.

Therefore, the industry uses heat pipes as heat-conducting elements. The heat pipes are installed in the heat dissipation fins, and the low-boiling-point working liquid filled in the heat pipes absorbs heat and evaporates at the heat-generating electronic components (evaporation end), and moves to the heat dissipation fins. The fins (condensing end) transfer the heat generated by the heating electronic components to the cooling fins, and use the cooling fan to take away the generated heat to complete the heat dissipation of the electronic components.

The manufacturing method of the heat pipe is to fill a hollow tube with metal powder, and sinter the metal powder to form a capillary structure layer on the inner wall of the hollow tube, and then vacuumize the tube Fill in the working fluid and finally seal the tube, but because of the thinning requirements of electronic equipment, the heat pipe needs to be made thin.

The principle of the vapor chamber is the same as that of the heat pipe, which conducts heat through the evaporation and condensation of the working fluid. The only difference is that the heat pipe mainly adopts axial heat conduction, while the vapor chamber is a large-area approximate surface-to-surface heat conduction, like The current electronic equipment adopts a thinner design, so in order to use it with the electronic equipment, it is necessary to make a thinner design for the heat pipe or the chamber.

The known technology is to flatten a heat pipe into a flat plate shape, so as to meet the demand for thinning. To make a heat pipe thin, the first step is to fill the heat pipe with powder and sinter it, then flatten the heat pipe into a flat shape, and then carry out After filling the working fluid, seal the tube at last, or first press the tube body of the heat pipe into a flat shape and then carry out the powder filling and sintering operation, but because the internal cavity of the tube body is extremely narrow, the construction of the powder filling operation is not easy, and due to The capillary structure in the heat pipe should be used for support and capillary force conduction at the same time, and the effect is limited in a too narrow space.

In addition, the vapor channel inside the heat pipe will affect the vapor-liquid circulation due to excessive narrowness, so this manufacturing process and structure are not suitable.

The biggest problem in the known technology is that although the thinned heat pipe has a larger heat receiving and cooling area, the heat pipe only has the effect of axial heat conduction, and cannot achieve radial heat conduction; therefore, the known technology has the following disadvantages:

1. Thin heat pipe processing is not easy;

2. It is easy to damage the capillary structure in the heat pipe;

3. High manufacturing cost;

4. Cannot conduct heat radially.

Contents of the invention

The main purpose of the present invention is to provide a thin heat pipe structure capable of conducting heat both in the axial direction and in the radial direction.

Another object of the present invention is to provide a method for manufacturing a thin heat pipe structure that can be made into a thin heat pipe.

In order to achieve the above purpose, the present invention proposes a thin heat pipe structure, which includes: a pipe body and a grid body; the pipe body has a chamber, and the inner wall of the chamber has at least one first groove and at least one A second slot, the first and second slots extend alternately; the grid body has a plurality of grids, and the grid body is attached to the inner wall of the chamber.

In order to achieve the above object, the present invention proposes a method for manufacturing a thin heat pipe structure, which comprises the following steps:

Prepare a hollow tube and a grid;

opening at least one first channel and at least one second channel on the inner wall of the hollow tube;

The grid body is attached to the inner wall of the aforementioned tube body;

Press the tube body into a flat shape;

Vacuumize the tube body and fill it with working fluid;

The tube is closed.

Through the thin heat pipe structure and its manufacturing method of the present invention, the heat pipe can be thinned, and heat can be transferred in both the axial and radial directions of the pipe body, greatly improving the heat transfer efficiency.

Detailed ways

The above-mentioned purpose of the present invention and its structural and functional characteristics will be described based on the preferred embodiments of the accompanying drawings.

Please refer to Fig. 1, Fig. 1a, Fig. 2 and Fig. 2a, which are the three-dimensional exploded view and combined view of the first embodiment of the thin heat pipe structure of the present invention and the partial enlarged view of the three-dimensional exploded view and combined view, as shown in the figure, The thin heat pipe structure 1 includes: a pipe body 11 and a grid body 12;

The pipe body 11 has a chamber 111 and a working fluid 13 (as shown in FIG. 8 ), the inner wall 1111 of the chamber 111 has at least one first channel 1111a and at least one second channel 1111b, the first The first and second channels 1111a and 1111b extend alternately;

The grid body 12 has a plurality of grids 121 , and the grid body 12 is attached to the inner wall 1111 of the chamber 111 .

The tube body 11 further has a first closed end 112 and a second closed end 113 , and the first closed end 112 and the second closed end 113 communicate with the chamber 111 .

Please refer to Fig. 3, which is a cross-sectional view of the second embodiment of the thin heat pipe structure of the present invention. As shown in the figure, part of the structure of this embodiment is the same as that of the first embodiment, so it will not be repeated here, but The difference between this embodiment and the aforementioned first embodiment is that the surfaces of the first and second channels 1111a and 1111b have sintered powder 5, and the sintered powder 5 is any one of copper powder and aluminum powder. The examples are illustrative but not limited to copper powder.

Please refer to Fig. 4, which is a cross-sectional view of the third embodiment of the thin heat pipe structure of the present invention. As shown in the figure, part of the structure of this embodiment is the same as that of the first embodiment, so it will not be repeated here, but The difference between this embodiment and the aforementioned first embodiment is that the first channel 1111a extends in an arc shape, the second channel 1111b extends in an arc shape, and the first and second channels 1111a, 1111b are Interlaced with each other, and at least one intersecting portion 1111c is formed at the intersection of the first and second channels 1111a, 1111b.

Please refer to Fig. 5, which is a cross-sectional view of the tube body of the fourth embodiment of the thin heat pipe structure of the present invention. As shown in the figure, part of the structure of this embodiment is the same as that of the aforementioned first embodiment, so it will not be repeated here, but The difference between this embodiment and the aforementioned first embodiment is that the first channel 1111a extends helically, the second channel 1111b extends helically, and the first and second channels 1111a, 1111b are mutually interlaced, and at least one intersecting portion 1111c is formed at the intersection of the first and second channels 1111a, 1111b.

Please refer to Fig. 6, which is a cross-sectional view of the fifth embodiment of the thin heat pipe structure of the present invention. As shown in the figure, part of the structure of this embodiment is the same as that of the first embodiment, so it will not be repeated here, but The difference between this embodiment and the aforementioned first embodiment is that the first channel 1111a and the second channel 1111b are only provided on the tube body 11 close to the first closed end 112 and the second closed end 113 .

Please refer to Fig. 7 and Fig. 8, which are application schematic diagrams and A-A cross-sectional views of the thin heat pipe structure of the present invention. It is in contact with at least one heat source 3, and the heat dissipation end 11b is in contact with at least one heat dissipation element 4. In this embodiment, the heat dissipation element 4 is illustrated as a radiator but not limited thereto. When the heat source 3 generates heat, And the heat is absorbed by the heat receiving end 11a so that the liquid working fluid 13a is evaporated and converted into a vapor working fluid 13b, and the vapor working fluid 13b is conducted to the heat dissipation end 11b through the gap between the grid bodies 12 and then transferred to the cooling end 11b. The cooling end 11b is cooled, and the cooled gaseous working fluid 13b is condensed into a liquid working fluid 13a, and diffuses back through the first and second grooves 1111a, 1111b on the inner wall 1111 of the chamber 111 of the pipe body 11, Therefore, the liquid working fluid 13a can flow back to the heated end 11a along the axial and radial directions of the first and second grooves 1111a and 1111b of the pipe body 11 .

Please refer to Fig. 9 and Fig. 10, which are another application schematic diagram and B-B cross-sectional view of the thin heat pipe structure of the present invention. As shown in the figure, if the side where the heated end 11a is in contact with the heat source 3 is set as the heat-absorbing side 11c, then On the contrary, the other side of the heat-absorbing side 11c is set as the heat-dissipating side 11d, and the heat-dissipating element 4 can be arranged on the heat-dissipating side 11d. When the heat-absorbing side 11c absorbs the heat generated by the heat source 3, the liquid working fluid 13a undergoes evaporative conversion. The vaporized working fluid 13b is conducted to the cooling side 11d for cooling, and the condensed liquid working fluid 13a flows back along the first and second channels 1111a and 1111b to the heat-absorbing side 11c to continue the vapor-liquid cycle.

Therefore, the thin heat pipe structure 1 of the present invention not only has the function of conducting heat in the axial direction, but also has the function of conducting heat in the radial direction, and can increase its support through the grid body 12 .

Please refer to Fig. 11, Fig. 12 and Fig. 13, which are the step flow chart and processing schematic diagram of the first embodiment of the thin heat pipe structure manufacturing method of the present invention and supplemented by referring to Fig. 4 and Fig. Referring to Fig. 1 and Fig. 2, the manufacturing method of the thin heat pipe structure comprises the following steps:

S1: Prepare a hollow tube and a grid;

A hollow pipe body 11 and a grid body 12 are prepared. The hollow pipe body 11 and the grid body 12 are made of metal materials with good thermal conductivity, such as copper and aluminum materials, or any of them. A metal with good thermal conductivity, this embodiment uses copper as an illustration but is not limited thereto.

S2: opening at least one first channel and at least one second channel on the inner wall of the hollow tube;

At least one first groove 1111a and at least one second groove 1111b are provided along the surface of the inner chamber 111 of the hollow tubular body 11 by machining (it may be turning), and the first groove 1111a and The second channel 1111b can extend linearly (as shown in FIG. 1 ), arcuately (as shown in FIG. 4 ) and helically (as shown in FIG. 5 ).

S3: attaching the mesh body to the inner wall of the aforementioned tube body;

Put the aforementioned mesh body 12 into the cavity 111 of the aforementioned hollow tube body 11, and completely flatten the inner wall 1111 of the cavity 111 in the tube body 11, and cover the aforementioned first and second channels 1111a, 1111b.

S4: pressing the tube body into a flat shape;

The pipe body 11 is placed on the stamping tool 2, and the pipe body 11 is pressed into a flat shape by stamping.

S5: vacuumize the pipe body and fill it with working fluid;

The chamber 111 of the tube body 11 pressed into a flat shape is evacuated and filled with the working fluid 13 .

S6: closing the tube body.

Finally, the open end of the tube body 11 that is evacuated and filled with the working fluid 13 is closed.

Please refer to Fig. 11, which is a flow chart of the steps of the second embodiment of the thin heat pipe structure manufacturing method of the present invention, as shown in the figure, and refer to Fig. 1 and Fig. 2 together, the thin heat pipe structure manufacturing method includes Follow these steps:

S1: Prepare a hollow tube and a grid;

S2: opening at least one first channel and at least one second channel on the inner wall of the hollow tube;

S3: attaching the mesh body to the inner wall of the aforementioned tube body;

S4: pressing the tube body into a flat shape;

S5: vacuumize the pipe body and fill it with working fluid;

S6: closing the tube body.

The aforementioned steps are the same as those of the aforementioned first embodiment and can refer to the description of the first embodiment, so they will not be repeated here, but the difference between this embodiment and the aforementioned first embodiment is step S2: At least one first channel and at least one second channel are defined on the inner wall of the hollow tube;

In this embodiment, at least one first channel 1111a and at least one second channel 1111b are provided on the inner wall 1111 of the hollow tube body 11 through machining and milling, along the inner cavity of the hollow tube body 11 111 The inner wall 1111 defines at least one first channel 1111a and one second channel 1111b.

Please refer to Fig. 14, which is a flow chart of the steps of the third embodiment of the thin heat pipe structure manufacturing method of the present invention. As shown in the figure, and referring to Fig. 1 and Fig. 2 together, the thin heat pipe structure manufacturing method includes the following step:

S1: Prepare a hollow tube and a grid;

S2: opening at least one first channel and at least one second channel on the inner wall of the hollow tube;

S3: attaching the mesh body to the inner wall of the aforementioned tube body;

S4: pressing the tube body into a flat shape;

S7: performing heat treatment on the pipe body;

S5: vacuumize the pipe body and fill it with working fluid;

S6: closing the tube body.

The aforementioned steps are the same as those of the aforementioned first embodiment, and can refer to the description of the first embodiment, so they will not be repeated here, but the difference between this embodiment and the aforementioned first embodiment is in step S5: Vacuumize the tube body and fill it with working fluid; and step S4: pressurize the tube body into a flat shape; there is a step S7 between the two steps: heat treat the tube body; The method of heating the hollow pipe body 11 and the grid body 12 arranged inside the hollow pipe body 11, the method of heat treatment is exemplified by diffusion bonding in this embodiment, but not cited As a limitation, the diffusion bonding makes the two (pipe body 11 and grid body 12) more tightly bonded to improve the efficiency of heat transfer.

The thin heat pipe of the present invention has the effect of heat conduction both in the axial direction and in the radial direction, so whether it is used for axial heat conduction or radial large-area heat conduction, it has excellent heat conduction performance.

Illustration

Fig. 1 is the three-dimensional exploded view of the first embodiment of the thin heat pipe structure of the present invention;

Figure 1a is a partially enlarged view of the first embodiment of the thin heat pipe structure of the present invention

Fig. 2 is the three-dimensional assembly diagram of the first embodiment of the thin heat pipe structure of the present invention;

Figure 2a is a partial enlarged view of the first embodiment of the thin heat pipe structure of the present invention;

3 is a three-dimensional combined sectional view of the second embodiment of the thin heat pipe structure of the present invention;

4 is a sectional view of the third embodiment of the thin heat pipe structure of the present invention;

5 is a cross-sectional view of the fourth embodiment of the thin heat pipe structure of the present invention;

Fig. 6 is a sectional view of the fifth embodiment of the thin heat pipe structure of the present invention;

7 is a schematic diagram of the application of the thin heat pipe structure of the present invention;

Figure 8 is a sectional view of Figure 7A-A of the present invention;

Figure 9 is a schematic diagram of the application of the thin heat pipe structure of the present invention;

Fig. 10 is a sectional view of Fig. 8B-B of the present invention;

Fig. 11 is a flow chart of the steps of the first embodiment of the manufacturing method of the thin heat pipe structure of the present invention;

Fig. 12 is a processing schematic diagram of the thin heat pipe structure manufacturing method of the present invention;

Fig. 13 is a processing schematic diagram of the thin heat pipe structure manufacturing method of the present invention;

FIG. 14 is a flow chart of the steps of the third embodiment of the manufacturing method of the thin heat pipe structure of the present invention.

Description of main component symbols

Thin heat pipe structure 1

Tube 11

Heating end 11a

Heat sink 11b

Chamber 111

Inner wall 1111

first channel 1111a

Second channel 1111b

Interlaced part 1111c

First closed end 112

second closed end 113

Mesh 12

Grid 121

Working Fluid 13

Liquid working fluid 13a

Vapor working fluid 13b

heat source 3

Heat dissipation element 4

Sintered powder 5

Claims (12)

1. slim heat pipe structure is to comprise:

One body has a chamber and a working fluid, and wall has at least one first conduit and at least one second conduit within this chamber, and said first and second conduit is interlaced extension;

One grid body has a plurality of grids, and this grid is shown consideration for and invested the aforementioned cavity inwall.

2. slim heat pipe structure as claimed in claim 1, wherein said first and second conduit surface has sintered powder.

3. slim heat pipe structure as claimed in claim 2, wherein said sintered powder are to be that copper powders may and aluminium powder are wherein arbitrary.

4. slim heat pipe structure as claimed in claim 1, wherein said this body also have one first blind end and one second blind end, and said first blind end and second blind end system are connected with aforementioned cavity.

5. slim heat pipe structure as claimed in claim 1, wherein said first conduit system is arcuation extends, and said second conduit system is arcuation extends, and this first and second conduit is interlaced, and forms at least one staggered portion in this first and second conduit staggered place.

6. slim heat pipe structure as claimed in claim 1, wherein said first conduit are that shape extends in the shape of a spiral, and said second conduit is that shape extends in the shape of a spiral, and this first and second conduit is interlaced, and form at least one staggered portion in this first and second conduit staggered place.

7. slim heat pipe structure as claimed in claim 4, wherein said body are only in being provided with aforementioned first and second conduit near this first blind end and this second blind end place.

8. slim heat pipe structure manufacturing approach is to comprise the following step:

Prepare a hollow tube and a grid body;

Wall is offered at least one first conduit and at least one second conduit within this hollow tube;

Wall within the light-emitting diode body is located in this grid consideration;

With this body add be pressed into flat-shaped;

This body is vacuumized and inserts working fluid;

With this body sealing.

9. slim heat pipe structure manufacturing approach as claimed in claim 8, wherein said step are pressed into this body and have more a step after flat-shaped this body is heat-treated.

10. slim heat pipe structure manufacturing approach as claimed in claim 9, wherein said heat treatment are to be diffusion bond.

11. adding this body, slim heat pipe structure manufacturing approach as claimed in claim 8, wherein said step be pressed into flat-shaped system through pressing.

12. slim heat pipe structure manufacturing approach as claimed in claim 8, wherein said step wall within this hollow tube are offered at least one first conduit and one second conduit system is made through turning processing and the wherein arbitrary processing method of Milling Process.

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