Improved composite heat pipe

Abstract

The utility model relates to the technical field of radiator heat pipe production, and discloses an improved composite heat pipe which comprises a pipe body, the two ends of the pipe body are closed, working fluid is arranged in the pipe body, and the pipe body comprises an evaporation area, a transition area and a condensation area. The transition area is arranged at the tail end of the evaporation area, the condensation area is arranged at the tail end of the transition area, and the evaporation area, the transition area and the condensation area are sequentially connected end to end. A first capillary structure is arranged in the evaporation area, and a first groove is formed between the evaporation area and the first capillary structure. The transition area is provided with a second capillary structure, and a second groove is formed between the transition area and the second capillary structure. A third groove is formed in the inner wall of the condensation area. The porosity of the first capillary structure is lower than that of the second capillary structure. By arranging the first capillary structure and the second capillary structure which are different in porosity, differential configuration of the porosity is achieved, the problems that the structure is compact and the porosity is reduced due to the fact that too much copper powder exists in an existing heat pipe are effectively solved, and therefore the heat resistance is reduced, and the heat conduction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to radiator heat pipe production technical field especially is a kind of improved composite heat pipe. BACKGROUND

[0002] General electronic device or machine equipment generates high temperature when operating, so manufacturer usually installs heat pipe to dissipate heat. Heat pipe is to use internal cooling liquid evaporation and condensation to achieve the effect of rapid temperature equalization. In detail, liquid cooling liquid in heat pipe moves to condensing end by vapor pressure after absorbing heat in evaporation end. After gaseous cooling liquid condenses into liquid cooling liquid in condensing end, liquid cooling liquid flows back to evaporation end again through internal capillary structure, absorbs heat and evaporates again to carry out cooling cycle.

[0003] For example, the patent name of the Chinese patent document with publication number CN201318892Y is heat pipe, which mentions "including: a pipe body, both ends are closed, with a plurality of grooves on the inner wall of the pipe body; a layer of copper powder, provided on the inner wall surface of the middle section of the pipe body and having a predetermined thickness; and a predetermined amount of operating liquid, filled into the pipe body; the pipe body defines a heated section in the middle section, and the pipe body with a predetermined length is defined as an adiabatic section at both ends of the heated section, and the remaining pipe body is defined as a condensing section at the outer end of the two adiabatic sections; the distribution area of the layer of copper powder inside the pipe body covers the heated section and part of the two adiabatic sections", the structure can improve the transition efficiency of the operating liquid flowing back into the copper powder by setting copper powder in part of the two adiabatic sections, thereby improving the overall efficiency of the heat pipe.

[0004] Then, from the above, the existing heat pipe is usually sintered by filling single copper powder, and the capillary force is improved by increasing the amount of copper powder. However, the existing heat pipe uses more copper powder, and the structure after sintering is more dense, the porosity decreases, the thermal resistance increases, and the local dry burning is easy to cause the heat conduction failure.

[0005] Therefore, it is necessary to study a new technical solution to solve the above problems. UTILITY MODEL CONTENT

[0006] Therefore, the utility model provides an improved composite heat pipe in view of the defects of the prior art.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0008] An improved composite heat pipe comprises a pipe body, the pipe body is closed at both ends, the pipe body is provided with working liquid, the pipe body comprises an evaporation zone, a transition zone and a condensation zone; the transition zone is arranged at the end of the evaporation zone, the condensation zone is arranged at the end of the transition zone, and the evaporation zone, the transition zone and the condensation zone are sequentially connected end to end; the evaporation zone is provided with a first capillary structure, and a first groove is arranged between the evaporation zone and the first capillary structure; the transition zone is provided with a second capillary structure, and a second groove is arranged between the transition zone and the second capillary structure; a third groove is arranged on the inner wall of the condensation zone.

[0009] Wherein, the porosity of the first capillary structure is lower than the porosity of the second capillary structure.

[0010] As a further elaboration, the first capillary structure is integrally made of fine copper powder material; the second capillary structure is integrally made of coarse copper powder material; the particle diameter of the fine copper powder is smaller than the particle diameter of the coarse copper powder.

[0011] As a further elaboration, the mesh number of the fine copper powder is 100-150 mesh; the mesh number of the coarse copper powder is 60-80 mesh.

[0012] As a further elaboration, the first capillary structure and the first groove are integrally sintered and formed; the second capillary structure and the second groove are integrally sintered and formed; the cross-sectional shape of the first capillary structure is a honeycomb shape that is uniformly distributed or unevenly distributed, and the cross-sectional shape of the second capillary structure is an irregular or regular polygon.

[0013] As a further elaboration, a plurality of air tubes are arranged outside the third groove; the plurality of air tubes form a powder-free air channel for reducing the thermal resistance of the heat pipe.

[0014] As a further elaboration, a first groove segment and a second groove segment are arranged in the second groove; the first groove segment and the second groove segment are connected end to end, and the size of the first groove segment is greater than the size of the second groove segment; the size of the first groove is greater than the size of the first groove segment; the size of the second groove segment is greater than the size of the third groove.

[0015] As a further elaboration, the first groove is arranged in a spiral structure; the second groove is arranged in a strip or spiral structure; the third groove is arranged in a strip or spiral structure.

[0016] As a further elaboration, the first groove and the third groove are arranged in a trapezoidal, triangular, rectangular or special-shaped structure; the first groove segment is arranged in a triangular structure, and the second groove segment is arranged in a rectangular or trapezoidal structure.

[0017] As a further illustration, the condensing area is provided with a graphene composite layer, which is wrapped outside the third groove and has a thickness of 100-150 nm.

[0018] As a further illustration, a heat conductor for rapid heat conduction is arranged between the third groove and the graphene composite layer; and a heat dissipation fin or a heat plate is arranged outside the condensing area and closely adheres to the condensing area.

[0019] The utility model discloses a kind of composite heat pipes, which has obvious advantages and beneficial effects compared with prior art, specifically speaking, as known from the above technical solution:

[0020] By setting the first capillary structure and the second capillary structure with different porosities, the differential configuration of porosity is achieved. The first capillary structure is made of fine copper powder material, which has a low porosity and is mainly located in the evaporation zone, helping the rapid evaporation of working fluid. The second capillary structure is made of coarse copper powder material, which has a high porosity and is located in the transition zone, facilitating the smooth flow of steam and the reflux of condensate. This effectively avoids the problem of dense structure and reduced porosity caused by excessive copper powder in existing heat pipes, thereby reducing thermal resistance and improving heat conduction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 The utility model provides a kind of overall structure schematic diagram of improved composite heat pipe;

[0023] Figure 2 The utility model provides a kind of internal structure schematic diagram of improved composite heat pipe;

[0024] Figure 3 The utility model provides the internal structure schematic diagram of condensing area;

[0025] Figure 4 The utility model provides the cross-sectional structure schematic diagram of evaporation zone;

[0026] Figure 5 The utility model provides the first slot section cross-sectional structure schematic diagram of transition zone;

[0027] Figure 6 The utility model provides the second slot section cross-sectional structure schematic diagram of transition zone;

[0028] Figure 7The utility model provides a cross section structure schematic drawing of condensing area.

[0029] In the drawing, various reference signs:

[0030] 10, evaporation area; 11, transition area; 12, condensing area; 20, first capillary structure; 21, first groove; 30, second capillary structure; 31, second groove; 311, first groove section; 312, second groove section; 40, third groove; 42, graphene composite layer. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical schemes and beneficial effects of the present application clearer and more apparent, the present application will be further described in detail below in combination with the drawings and examples.

[0032] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0035] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples.

[0036] In an embodiment of the utility model, as Figures 1-7As shown, an improved composite heat pipe is provided, which comprises a pipe body, the pipe body is closed at both ends, and a working fluid is arranged in the pipe body. The pipe body comprises an evaporation zone 10, a transition zone 11 and a condensation zone 12. The transition zone 11 is arranged at the end of the evaporation zone 10, and the condensation zone 12 is arranged at the end of the transition zone 11. The evaporation zone 10, the transition zone 11 and the condensation zone 12 are sequentially connected end to end. The evaporation zone 10 is provided with a first capillary structure 20, and a first groove 21 is arranged between the evaporation zone 10 and the first capillary structure 20. The transition zone 11 is provided with a second capillary structure 30, and a second groove 31 is arranged between the transition zone 11 and the second capillary structure 30. The inner wall of the condensation zone 12 is provided with a third groove 40.

[0037] The porosity of the first capillary structure 20 is lower than the porosity of the second capillary structure 30, and the length of the transition zone 11 is 0.5-0.6 times the length of the evaporation zone 10.

[0038] By arranging the first capillary structure 20 and the second capillary structure 30 with different porosities, the differential configuration of the porosities is realized. The first capillary structure 20 is made of fine copper powder material and has a relatively low porosity, and is mainly located in the evaporation zone 10, which is helpful for the rapid evaporation of the working fluid. The second capillary structure 30 is made of coarse copper powder material and has a relatively high porosity, and is located in the transition zone 11, which is conducive to the smooth flow of steam and the return flow of condensed liquid, effectively avoiding the problem of dense structure and reduced porosity caused by excessive use of copper powder in the existing heat pipe, thereby reducing the thermal resistance and improving the heat conduction efficiency.

[0039] Preferably, in the present embodiment, the sizes of the first groove 21, the second groove 31 and the third groove 40 are the same.

[0040] The first capillary structure 20 is integrally made of fine copper powder material. The second capillary structure 30 is integrally made of coarse copper powder material. The particle diameter of the fine copper powder is smaller than the particle diameter of the coarse copper powder.

[0041] By arranging the first capillary structure 20 and the second capillary structure 30 with different porosities, the differential configuration of the porosities is realized. The first capillary structure 20 is made of fine copper powder material and has a relatively low porosity, and is mainly located in the evaporation zone 10, which is helpful for the rapid evaporation of the working fluid. The second capillary structure 30 is made of coarse copper powder material and has a relatively high porosity, and is located in the transition zone 11, which is conducive to the smooth flow of steam and the return flow of condensed liquid, effectively avoiding the problem of dense structure and reduced porosity caused by excessive use of copper powder in the existing heat pipe, thereby reducing the thermal resistance and improving the heat conduction efficiency.

[0042] Further, the fine copper powder has a mesh number of 100-150 mesh. The coarse copper powder has a mesh number of 60-80 mesh. In the embodiment, the mesh numbers of the fine copper powder and the coarse copper powder can be combined in different combinations according to actual production conditions, so that the composite heat pipe can meet the use of different occasions.

[0043] Further, the first capillary structure 20 is integrally sintered and formed with the first groove 21. The second capillary structure 30 is integrally sintered and formed with the second groove 31. The cross-sectional shape of the first capillary structure 20 is uniformly distributed or unevenly distributed honeycomb shape, and the cross-sectional shape of the second capillary structure 30 is irregular or regular polygon. In the embodiment, the corresponding cross-sectional shape is selected according to different occasions, the cross-sectional shape of the capillary structure is optimized, the flow resistance of the fluid in the capillary structure is reduced, the heat conduction efficiency is improved, and the risk of heat conduction failure caused by local dry burning is reduced.

[0044] Preferably, the third groove 40 is provided with a plurality of groups of air tubes outside. The plurality of groups of air tubes form a powder-free air channel for reducing the thermal resistance of the heat pipe, and the width is 0.3-0.5mm. By setting the powder-free air channel, the thermal resistance inside the heat pipe is effectively reduced, the heat dissipation efficiency is improved, and the heat conduction failure problem caused by local dry burning is avoided.

[0045] Preferably, in another embodiment, the sizes of the first groove 21, the second groove 31 and the third groove 40 are designed to be sequentially reduced along the fluid flow direction.

[0046] The second groove 31 is provided with a first groove section 311 and a second groove section 312. The first groove section 311 and the second groove section 312 are connected end to end, and the size of the first groove section 311 is greater than the size of the second groove section 312, wherein the groove depth of the second groove section 312 is 0.5 or 0.75 times the groove depth of the first groove section 311. The size of the first groove 21 is greater than the size of the first groove section 311. The size of the second groove section 312 is greater than the size of the third groove 40. By setting the stepped groove section with gradually reduced size, the flow resistance of the fluid in the groove is reduced, the heat conduction efficiency is improved, and the thermal resistance is further reduced.

[0047] Further, the first groove 21 is provided in a spiral structure. The second groove 31 is provided in a strip or spiral structure. The third groove 40 is provided in a strip or spiral structure. By setting the spiral or strip structure groove mechanism, the heat dissipation area is effectively increased, the heat dissipation efficiency is improved, the working temperature of the heat pipe is reduced, and the risk of heat conduction failure caused by local dry burning is reduced.

[0048] Further, the first groove 21 and the third groove 40 are arranged in a trapezoidal or triangular or rectangular or special-shaped structure. The first groove section 311 is arranged in a triangular structure, and the second groove section 312 is arranged in a rectangular or trapezoidal structure. By optimizing the shape design of each groove, the vortex and turbulent flow phenomenon of the fluid in the groove is reduced, the heat conduction efficiency is improved, and the thermal resistance is further reduced.

[0049] Preferably, the condensation area 12 is provided with a graphene composite layer 42, the graphene composite layer 42 is wrapped outside the third groove 40, and the thickness is 100-150nm.

[0050] In the embodiment, the graphene composite layer 42 has high thermal conductivity, accelerates heat conduction, improves heat transfer efficiency, and has super-hydrophilic properties, which can reduce the flow resistance of the liquid in the wick. By arranging the graphene composite layer 42, the heat conduction performance and heat dissipation efficiency of the heat pipe are improved, the thermal resistance is reduced, and the overall performance of the heat pipe is improved.

[0051] Further, a heat-conducting body for rapid heat conduction is arranged between the third groove 40 and the graphene composite layer 42, and the heat-conducting body is made of a heat-conducting material such as copper or aluminum. The condensation area 12 is provided with a heat dissipation fin or a heat plate which is tightly attached to the condensation area 12. By arranging the heat-conducting body and the heat dissipation fin or the heat plate, the heat dissipation efficiency of the heat pipe is further improved, the working temperature of the heat pipe is reduced, the risk of heat conduction failure caused by local dry burning is reduced, and the reliability and stability of the heat pipe are improved.

[0052] The above is only a preferred embodiment of the present application, and only the technical principle of the present application is specifically described. These descriptions are only for explaining the principle of the present application, and cannot be explained as a limitation on the protection scope of the present application in any way. Based on the above explanation, any modification, equivalent replacement and improvement within the spirit and principle of the present application, and other specific embodiments of the present application which can be easily thought by those skilled in the art without creative labor, should be included in the protection scope of the present application.

Claims

1. An improved composite heat pipe, comprising a tube body, the tube body being sealed at both ends, and a working fluid being disposed within the tube body, characterized in that, The tube body includes an evaporation zone, a transition zone, and a condensation zone; the transition zone is located at the end of the evaporation zone, the condensation zone is located at the end of the transition zone, and the evaporation zone, transition zone, and condensation zone are connected end to end in sequence; the evaporation zone has a first capillary structure, and a first groove is provided between the evaporation zone and the first capillary structure; the transition zone has a second capillary structure, and a second groove is provided between the transition zone and the second capillary structure; a third groove is provided on the inner wall of the condensation zone; The porosity of the first capillary structure is lower than that of the second capillary structure.

2. The improved composite heat pipe according to claim 1, characterized in that, The first capillary structure is integrally made of fine copper powder material; the second capillary structure is integrally made of coarse copper powder material; the particle diameter of the fine copper powder is smaller than the particle diameter of the coarse copper powder.

3. The improved composite heat pipe according to claim 2, characterized in that, The fine copper powder has a mesh size of 100-150; the coarse copper powder has a mesh size of 60-80.

4. The improved composite heat pipe according to claim 3, characterized in that, The first capillary structure and the first groove are integrally sintered; the second capillary structure and the second groove are integrally sintered; the cross-sectional shape of the first capillary structure is a uniformly or non-uniformly distributed honeycomb structure, and the cross-sectional shape of the second capillary structure is an irregular or regular polygon.

5. The improved composite heat pipe according to claim 1, characterized in that, Multiple sets of air pipes are provided on the outer side of the third groove; the multiple sets of air pipes form a powder-free air channel for reducing the thermal resistance of the heat pipe.

6. The improved composite heat pipe according to claim 1, characterized in that, The second trench is provided with a first groove segment and a second groove segment; the first groove segment and the second groove segment are connected end to end, and the size of the first groove segment is larger than the size of the second groove segment; the size of the first trench is larger than the size of the first groove segment; the size of the second groove segment is larger than the size of the third trench.

7. The improved composite heat pipe according to claim 6, characterized in that, The first groove is arranged in a spiral structure; the second groove is arranged in a strip or spiral structure; the third groove is arranged in a strip or spiral structure.

8. The improved composite heat pipe according to claim 7, characterized in that, The first trench and the third trench are arranged in a trapezoidal, triangular, rectangular or irregular shape; the first trench segment is arranged in a triangular shape, and the second trench segment is arranged in a rectangular or trapezoidal shape.

9. The improved composite heat pipe according to claim 1, characterized in that, The condensation zone is provided with a graphene composite layer, which is wrapped around the outside of the third trench and has a thickness of 100-150 nm.

10. The improved composite heat pipe according to claim 9, characterized in that, A heat conductor for rapid heat conduction is provided between the third trench and the graphene composite layer; a heat dissipation fin or heat spreader is provided on the outside of the condensation zone in close contact with it.

Images