TWM578372U - Heat pipe with composite structure - Google Patents

Abstract

A heat pipe with composite structure is provided. The heat pipe comprises a working fluid, a first capillary structure, a second capillary structure and a tube body. The first capillary structure has a smooth surface. The second capillary structure has a plurality of grooves. The tube body is used for accommodating the working fluid. The tube body includes a first section and a second section. The first section has a first inner wall. The first capillary structure is formed on the first inner wall. The second section is connected with the first section. The second section has a second inner wall. The grooves are formed on the second inner wall corresponding to an axial direction.

Description

Compound heat pipe

This creation is about a composite heat pipe, especially a composite heat pipe with two different capillary structures.

In addition to the general heat dissipation design, in addition to the air-cooled, water-cooled mechanism or the heat dissipation unit of a special material, it can be cooled by different methods such as conduction or convection. Heat pipes (or heat pipes) (Heat Pipe) It is also an effective and common heat dissipation design.

The so-called heat pipe is a hollow metal pipe body closed at both ends, and the cavity of the pipe body is filled with an appropriate amount of a working fluid. The heat dissipation principle of the heat pipe is through the two-phase change of the working fluid, that is, the working fluid will first absorb heat on the heat source corresponding to a heating section at the end of the pipe body to form vaporization, and change from the liquid phase to the gaseous state, and diffuse in the pipe body It transfers heat to a condensing section at the other end of the pipe body, and then conducts heat exchange through the relevant external heat dissipation mechanism to remove the heat.

Secondly, a capillary structure is provided on the inner wall of the tube body. When the gaseous working fluid releases heat due to heat exchange, it will form condensation, and then change from gaseous state to liquid state. At this time, the capillary structure can return the liquid working fluid to the heating section through gravity or capillary force. In this way, the working fluid can be continuously transferred between the heating section and the condensing section of the pipe body until the two ends tend to be even temperature, so that the effect of continuous heat conduction and heat dissipation can be achieved.

However, this conventional heat pipe structure still has many technical defects to be improved. For example, because the flow direction of the liquid working fluid and the gaseous working fluid in the tube body is opposite, and the two are in the same chamber, it is easy to interfere with the transmission of each other and reduce the diffusion or backflow. The speed, in turn, has an impact on the overall thermal and thermal performance.

Therefore, the current common improvement method is to propose processing on the inner wall of the pipe body, creating related texture or groove structures, and then matching the capillary structure in order to improve the reflow effect. However, such a design will inevitably limit the flow space of the gaseous working fluid in the tube body, especially the smaller the diameter of the heat pipe, the more limited the improvement effect. In addition, the heat pipe often needs to be further bent or crimped in the subsequent manufacturing process, which will inevitably damage the relevant groove structure or capillary structure on the inner wall of the tube, thereby affecting the effect of reflow.

The purpose of this creation is to propose a composite heat pipe. The composite heat pipe has two different capillary structures, one of which has multiple grooves, and the other of the capillary structure has a smooth surface design. With this configuration, the gaseous working fluid can be compared Large flow space can increase the return speed of liquid working fluid.

This composition is a composite heat pipe, including a working fluid, a first capillary structure, a second capillary structure and a tube body. The first capillary structure has a smooth surface. The second capillary structure has a plurality of grooves. The tube body is used to contain the working fluid. The tube body includes a first section and a second section. The first section has a first inner wall, and the first capillary structure is formed on the first inner wall. The second section is connected to the first section, the second section has a second inner wall, and the grooves are formed on the second inner wall corresponding to an axial direction.

In order to have a better understanding of the above and other aspects of this creation, the following examples are given in detail in conjunction with the attached drawings.

1. 1 ’, 1” ‧‧‧‧composite heat pipe

100‧‧‧tube

101‧‧‧Air flow channel

102‧‧‧Working fluid

10, 10a, 10b ‧‧‧ first section

11‧‧‧First inner wall

20, 20 ’, 20a, 20b ‧‧‧ second section

21、21’‧‧‧Second inner wall

30, 30a, 30b ‧‧‧ capillary structure

31‧‧‧Smooth surface

40, 40 ’, 40a, 40b ‧‧‧ second capillary structure

41, 41 ’, 411, 412

42、42’‧‧‧Side wall

43, 43’‧‧‧ bottom

7‧‧‧heat source

8‧‧‧heat dissipation mechanism

C0‧‧‧case thickness

C1‧‧‧ First average thickness

C2‧‧‧Second average thickness

C3‧‧‧Depth

D1‧‧‧axial

S1, S1 ’, S1” ‧‧‧‧Heating section

S2, S2 ’, S2” transmission section

S3, S3 ’, S3” ‧‧‧‧Condensation section

Figure 1 is a schematic plan view of a composite heat pipe 1 proposed in the first embodiment of the present invention.

FIG. 2 is a side sectional view and application schematic diagram of the compound heat pipe 1.

FIG. 3 is a cross-sectional view of the composite heat pipe 1 at section A-A in FIG. 1.

FIG. 4 is a cross-sectional view of the composite heat pipe 1 in section B-B of FIG. 1.

FIG. 5 is a partially enlarged schematic view showing a second section 20 and a second capillary structure 40 of the composite heat pipe 1 in a lateral manner.

Fig. 6 is a cross-sectional view of a second section 20 'proposed in the second embodiment of the present invention.

Fig. 7 is a side cross-sectional view and application schematic diagram of a composite heat pipe 1 'proposed in the third embodiment of the present invention.

Fig. 8 is a side sectional view and application schematic diagram of a composite heat pipe 1 "proposed in the fourth embodiment of the present invention.

The following is an example for detailed description. The example is only used as an example, and does not limit the scope of protection of the creation. In addition, the drawings in the embodiments omit unnecessary or common technical elements to clearly show the technical characteristics of the creation.

A first embodiment is now used to illustrate the implementation of this creation. Please refer to Figure 1 and Figure 2 at the same time. FIG. 1 is a schematic plan view of a composite heat pipe 1 according to the first embodiment; FIG. 2 is a side cross-sectional view and application diagram of the composite heat pipe 1. As shown in FIG. 1 and FIG. 2, the composite heat pipe 1 mainly includes a tube body 100 and a working fluid 102. The working fluid 102 is accommodated in the tube body 100 that is closed at both ends. The pipe body 100 in FIGS. 1 and 2 is illustrated in a linear manner, but it can be understood that the possible forms of the pipe body 100 are not limited thereto.

The working fluid 102 can be water, cooling fluid or other fluids that can produce the same effect, such as methanol, acetone, mercury, etc. That is, it is in a liquid state before heating, and can be changed into a gaseous state after heating, and then returns to a liquid state after cooling. It can be understood that the applicable working fluid is different according to the temperature of the working environment, and must be injected into the tube body 100 before one end is closed. In the actual operating state, the working fluid 102 may present a liquid state and a gas state in the tube body 100 at the same time. The tube body 100 can be made of metal materials with better thermal conductivity, such as copper, aluminum, stainless steel, etc.

As shown in FIGS. 1 and 2, the tube body 100 includes a first section 10 and a second section 20. The second section 20 is connected to the first section 10. In this embodiment, the first section 10 is configured for a heating section S1 in an actual operating state, that is, the heating section S1 corresponds to a heat source 7 (eg, a wafer unit) for heating. Secondly, the second section 20 is a condensing section S3 and a transmission section S2, wherein the condensing section S3 corresponds to an external heat dissipation mechanism 8 (such as a heat dissipation fin set) for heat dissipation. Generally speaking, the defined heating section S1 and the condensing section S3 are respectively located at both ends of the tube body 100, and the transmission section S2 is located between the heating section S1 and the condensing section S3. The length of the heating section S1, the transmission section S2 and the condensation section S3 depends on the actual application.

Please refer to Figure 3 and Figure 4 at the same time. FIG. 3 is a cross-sectional view of the composite heat pipe 1 in section A-A of FIG. 1; FIG. 4 is a cross-sectional view of the composite heat pipe 1 in section B-B of FIG. 1. As shown in FIGS. 1 to 4, the heat pipe 1 further includes a first capillary structure 30 and a second capillary structure 40, wherein the first capillary structure 30 corresponds to the first section 10, and the second The capillary structure 40 corresponds to the second section 20. As can be seen from FIG. 3, the first section 10 has a first inner wall 11, and the first capillary structure 30 is formed on the first inner wall 11. As can be seen from FIG. 4, the second section 20 has a second inner wall 21, and the second capillary structure 40 is formed on the second inner wall 21.

As mentioned above, the first capillary structure 30 has a smooth surface 31, that is, after the structure is formed on the first inner wall 11, the smooth surface 31 with no unevenness is presented. One feature of this creation is that after the formation of the first capillary structure 30, there is still considerable space inside the first section 10, that is, the first capillary structure 30 only forms a specific thickness, and The inside of the first section 10 is not completely filled.

In detail, as shown in FIGS. 1 to 4, the tube body 100 further has an air flow channel 101 which penetrates the first section 10 and the second section 20 and is heated from the Section S1 communicates with this condensing section S3. In this way, the working fluid located at the first capillary structure 30 is heated by the heat source 7 to be vaporized into When gaseous, there is enough space to accommodate it.

Another feature of the present creation is that the second capillary structure 40 is directly formed on the second inner wall 21 with a plurality of grooves 41 corresponding to an axial direction D1. In this embodiment, the first section 10 and the second section 20 of the tube body 100 may be of an integral design, that is, the first inner wall 11 and the second inner wall 21 are integrally formed, However, different capillary structures are formed on them.

Therefore, it can be designed that the tube body 100 has the same thickness of the casing no matter in the first section 10 or the second section 20. The first capillary structure 30 and the second capillary structure 40 can be respectively formed on the first inner wall in an appropriate manner before the two ends (or only one end) of the tube body 100 have not been closed. 11 and the second inner wall 21. For example, the first capillary structure 30 and the second capillary structure 40 can be completed by sintering or metallurgically extending into the tube body 100 by powder of a metal such as copper.

The schematic diagram of FIG. 2 also presents the transmission state of the gaseous working fluid 102 (as indicated by the hollow arrows). The capillary structures 30, 40 formed of copper powder are attached to the inner walls 11, 21 of the tube body 100, so that the working fluid 102, which is transformed from the condensation section S3 to the liquid phase by the condensation, can be sequentially adsorbed on The second capillary structure 40 and the first capillary structure 30 can return to the heating section S1 (ie, the first section 10) (as indicated by solid arrows).

On the other hand, the axial direction D1 in this embodiment is the axis line direction of the tube body 100, and the grooves 41 correspond to the axial direction D1, that is, the grooves 41 are arranged from the The course of one end of the second section 20 to the other end is parallel to the axial direction D1. Of course, the concept of the present creation is not limited to this, that is, its arrangement can be not only parallel, as long as it can effectively return the liquid working fluid 102 to the heating section S1, it can be the groove type of the creation.

As shown in FIG. 4, the grooves 41 have a regularly arranged zigzag pattern, that is, a plurality of grooves are arranged at intervals. In this embodiment, the second capillary structure 40 further includes a plurality of side walls 42 adjacent to the trenches 41 and A bottom 43, the side walls 42 are matched with the grooves 41 to present square saw teeth on the bottom 43. Due to the arrangement of the grooves 41 of the second capillary structure 40, its perimeter is larger than that of a generally smooth capillary structure (such as the smooth surface 31 of the first capillary structure 30) Therefore, the cross-sectional area of the contact is also relatively increased, which can effectively improve the reflow speed.

Further, when the cross-sectional area of the capillary structure is increased, in addition to increasing the return speed, it can also effectively absorb the liquid working fluid, which makes the overflow phenomenon that commonly occurs in general heat pipe devices or the reverse flow that is likely to occur when the flow rate is large. The conventional problems such as sound and noise phenomena can also be significantly improved. Secondly, for the subsequent problems of the overflow phenomenon, when the temperature of the applied working environment is relatively low (for example, the polar region of minus 40 degrees Celsius), the icing problem caused by the overflow water can be solved together, and the Freezing will cause damage to the pipeline structure.

Furthermore, because the grooves 41 of the second capillary structure 40 are directly formed on the second inner wall 21, the second inner wall 21 is not processed first, and the related texture or groove structure is created Then, the capillary structure is sintered on it, so that the gaseous working fluid 102 can be relatively reduced by the constriction of the flow space in the tube body 100, that is, the gas flow channel 101 is relatively large.

Please refer to FIG. 5, which is a partially enlarged schematic view of the second section 20 and the second capillary structure 40 presented in a lateral manner. As shown in FIG. 5, the tube body 100 (in the second section 20) has a shell thickness C0, and the second capillary structure 40 has a second average thickness C2. Generally speaking, the deeper grooves can facilitate reflow, so in this embodiment, the second average thickness C2 is designed to be greater than the thickness C0 of the housing. As described above, the second capillary structure 40 includes the trench 41, the sidewall 42 and the bottom 43, so the second average thickness C2 is the depth C3 of the trench 41 (or the height of the sidewall 42) plus The thickness of the bottom 43.

In a simulation experiment, the thickness C0 of the housing can be designed between 0.1 millimeters (mm) and 0.4 millimeters (mm), and the second average thickness C2 is designed between 0.3 millimeters (mm) and 1.5 millimeters (mm) between. On the other hand, the depth C3 of the grooves 41 (or the height of the side walls 42) can be designed to be 0.3 millimeters (mm) to 0.5 millimeters (mm). Therefore, the maximum thickness of the bottom portion 43 may be 1.2 millimeters (mm). When both the second average thickness C2 and the depth C3 are designed to be 0.3 millimeters (mm), it means that the bottom 43 may not be designed.

On the other hand, the first capillary structure 30 has a first average thickness C1, the first average thickness C1 and the second average thickness C2 may have a corresponding relationship, or there is no corresponding relationship between the two, that is, the first An average thickness C1 may be less than, equal to or greater than the second average thickness C2. Generally speaking, in order to allow the gaseous working fluid 102 to have sufficient accommodation space, the first average thickness C1 formed should not be too large. However, because the temperature of the heating section S1 is relatively high, sufficient liquid working fluid 102 also needs to be retained, so the first average thickness C1 should not be too small. In a simulation experiment, the first average thickness C1 can be designed between 0.3 millimeters (mm) and 2.5 millimeters (mm).

This creation can also be designed according to the above-mentioned first embodiment of the technical concept of other changes, and can achieve the same or similar functions and purposes.

For example, in another embodiment, the configuration of the first section and the first capillary structure and the configuration of the second section and the second capillary structure may be manufactured separately, and then combined. In other words, the first section and the second section of the pipe body of the present creation may not be a whole, that is, their respective first inner wall and second inner wall may not be a unitary design. In this way, the first inner wall and the second inner wall may have different shell thicknesses. This combined design can be applied to larger heat pipe modules, because there may be a longer distance between the heat source and the heat dissipation mechanism.

Or alternatively, the types of the plurality of grooves in the second capillary structure of the present creation can also be changed differently, or can be adjusted according to application requirements.

A second embodiment is now used to illustrate the implementation of this creation. Please refer to FIG. 6, which is a cross-sectional view of a second section 20 'proposed by the second embodiment. Components with similar functions are indicated by similar component numbers, such as the second capillary structure 40 ', the groove 41', the side wall 42 'and the bottom 43'. As shown in FIG. 6, the difference between this second embodiment and the first embodiment lies in the many of the second capillary structures 40 'formed on a second inner wall 21' of the second section 20 ' Groove 41 ', 411 and 412 show non-equidistant or irregular arrangement.

As mentioned above, although the grooves 41 ', 411, and 412 also exhibit a zigzag pattern, that is, a plurality of grooves are also arranged at intervals, but two of the grooves 411 and 412 are wider than their phase The width of another adjacent trench 41 '(the width of other trenches can be set to be smaller). According to the known technology, the heat pipe often needs to be further bent or folded in the subsequent manufacturing process. Therefore, if some of the grooves of the capillary structure have a relatively large width, it can be processed for the part with a larger width during processing; for example, the two grooves 411, 412 in Figure 6 can be so Let the deformation or possible damage of the groove or capillary structure be effectively controlled and improved.

It can be understood that the two grooves with relatively large widths proposed in the second embodiment are only an implementation description thereof, but the concept of the present creation is not limited to this. For example, there may be more grooves or at least one groove with a relatively larger width.

Or alternatively, the corresponding relationship between the first section and the second section of the creation and the condensation section, the transmission section and the heating section can be designed differently. In the first embodiment, the first section 10 where the smooth surface 31 is formed is used as the heating section S1, and the second section 20 where the groove 41 is formed is used as the condensation section S3 and the transfer section S2. However, the structure of the section as the transmission section is actually not limited.

A third embodiment is now used to illustrate the implementation of this creation. Please refer to FIG. 7, which is a side sectional view and application schematic diagram of a composite heat pipe 1 'according to the third embodiment. Components with similar functions are indicated by similar component numbers. As shown in FIG. 7, the difference between this third embodiment and the first embodiment lies in that a second section 20a forming a second capillary structure 40a (ie, corresponding groove) is used only as a condensation section S3 ', and a first section 10a forming a first capillary structure 30a (ie a corresponding smooth surface) can be used as a heating section S1' and a transmission section S2 'at the same time.

A fourth embodiment is now used to illustrate the implementation of this creation. Please refer to FIG. 8, which is a side cross-sectional view of a composite heat pipe 1 "proposed in the fourth embodiment. And application diagram. Components with similar functions are indicated by similar component numbers. As shown in FIG. 8, the difference between this fourth embodiment and the first embodiment lies in that a first section 10b forming a first capillary structure 30b (ie, a corresponding smooth surface) is only used as a heating section S1 "is only a part, and a second section 20b forming a second capillary structure 40b (ie corresponding groove) can be used as a condensing section S3", a transmission section S2 "and the heating section The other part of S1 ", that is, the second capillary structure 40b of the second section 20b, appears to extend into the heating section S1". It should be noted that the second section 20b (or the first section The second capillary structure 40b) does not form an overlap with the heat source 7, that is, the second section 20b (or the second capillary structure 40b) only cuts the edge of the heat source 7 above, and does not cover it.

In summary, compared with the prior art, the composite heat pipe proposed in this creation can achieve the following technical improvements: First, the groove of the capillary structure in this creation is directly formed on the corresponding inner wall, so it can be The gaseous working fluid has a larger flow space; second, the groove design of the capillary structure relatively increases the cross-sectional area, so it can effectively increase the return speed; third, because the increased return speed, it can reduce the phenomenon of overflow Occurred, thereby avoiding the problems of back sound and noise; fourth, due to the reduction of water overflow, it can avoid the problems of icing and pipeline structure damage in low temperature environments; fifth, the original creation in the heating section There is still a gas flow channel inside the tube body, so that when the working fluid is vaporized into a gas state, there is enough space to accommodate it.

Therefore, this creation can effectively solve the related problems raised in the previous technology, and can successfully achieve the main purpose of the development of this case.

Although this creation has been disclosed above with examples, it is not intended to limit this creation. Those with ordinary knowledge in the technical field to which this creation belongs can be used for various changes and retouching without departing from the spirit and scope of this creation. Therefore, the scope of protection of this creation shall be deemed as defined by the scope of the attached patent application.

Claims (17)

A composite heat pipe includes: a working fluid; a first capillary structure with a smooth surface; a second capillary structure with a plurality of grooves; and a tube body for accommodating the working fluid; wherein the The tube body includes: a first section with a first inner wall, and the first capillary structure is formed on the first inner wall; and a second section, connected to the first section, the second The section has a second inner wall, and the grooves are formed on the second inner wall corresponding to an axial direction. The composite heat pipe as described in item 1 of the patent application range, wherein the pipe body has a shell thickness, the second capillary structure has a second average thickness, and the second average thickness is greater than the shell thickness. The composite heat pipe as described in item 2 of the patent application scope, wherein the thickness of the shell is between 0.1 millimeters (mm) and 0.4 millimeters (mm). The composite heat pipe as described in item 2 of the patent application range, wherein the second average thickness is between 0.3 millimeters (mm) and 1.5 millimeters (mm). The compound heat pipe as described in item 2 of the patent application scope, wherein the first capillary structure has a first average thickness, and the first average thickness is greater than the second average thickness. The composite heat pipe as described in item 5 of the patent application range, wherein the first average thickness is between 0.3 millimeters (mm) and 2.5 millimeters (mm). The composite heat pipe as described in item 2 of the patent application range, wherein the first capillary structure has a first average thickness, and the first average thickness is less than or equal to the second average thickness. The composite heat pipe as described in item 1 of the scope of patent application, wherein the grooves present a regular arrangement. The compound heat pipe as described in item 1 of the scope of the patent application, wherein the grooves present an irregular arrangement, and the width of at least one of the grooves is greater than that of the other groove adjacent to it width. The compound heat pipe as described in item 1 of the patent application scope, wherein the first section is a heating section, and the heating section corresponds to a heat source for heating. The composite heat pipe as described in item 10 of the patent application scope, wherein the second section is a condensing section and a transmission section, the condensing section corresponds to a heat dissipation mechanism for heat dissipation, the transmission section is located in the heating section and the Between the condensation sections. The compound heat pipe as described in item 1 of the patent application scope, wherein the second section is a condensing section, and the condensing section corresponds to a heat dissipation mechanism for heat dissipation. The composite heat pipe as described in item 12 of the patent application scope, wherein the first section is a heating section and a transmission section, the heating section corresponds to a heat source for heating, the transmission section is located in the heating section and the condensation Between segments. The composite heat pipe as described in item 1 of the patent application, wherein the first section is a part of a heating section, and the heating section corresponds to a heat source for heating. The compound heat pipe as described in item 14 of the patent scope, wherein the second section is a condensing section, a transmission section and another part of the heating section, the condensing section corresponds to a heat dissipation mechanism for heat dissipation The transmission section is located between the heating section and the condensation section, and the second section does not overlap with the heat source. The composite heat pipe as described in item 1 of the patent application scope, wherein the pipe body has an air flow channel, and the air flow channel penetrates the first section and the second section. The composite heat pipe as described in item 1 of the patent application scope, wherein the first capillary structure and the second capillary structure are completed by a powder of a metal by sintering or metallurgy, and the metal is copper.