Heat pipe

Abstract

The utility model relates to the technical field of heat pipes, aims to solve the problem that an existing heat pipe is poor in heat dissipation efficiency in a vertical inverse gravity working state, and provides a heat pipe. The heat pipe comprises a metal pipe, a working medium and a capillary structure. The capillary structure is annular, the periphery of the capillary structure is connected to the inner wall of the metal pipe, and a containing cavity is defined by the inner periphery of the capillary structure. The capillary structure comprises a composite part and a powder core part which are connected in the circumferential direction, and the composite part is formed by combining a woven wire harness and sintering powder. The powder core part is formed by sintering sintered powder. The heat pipe has the beneficial effects that the heat pipe is provided with the capillary structure formed by combining the composite part and the powder core part, the working medium can flow back more quickly by utilizing the larger adsorption force of the woven wire harness in the composite part in the vertical state to the working medium, the working medium backflow rate is increased, and therefore the heat dissipation efficiency of the working state of vertical inverse gravity is improved, and the service life of the heat pipe is prolonged. Therefore, the anti-gravity effect is achieved.

Description

Technical Field

[0001] The present application relates to heat pipe heat dissipation technology, and in particular, to a heat pipe. Background Art

[0002] Heat pipes are widely used in the field of heat dissipation. Existing heat pipe technology often uses horizontal installation of heat pipes to achieve heat dissipation. When the heat pipes are installed vertically, the heat dissipation power drops significantly. Utility Model Content

[0003] The present application provides a heat pipe to solve the problem that the power of the heat pipe in a vertical working state is less than the power in a horizontal working state. The heat pipe includes a metal pipe, a working fluid and a capillary structure. The capillary structure is annular, and the outer periphery of the capillary structure is connected to the inner wall of the metal pipe, and the inner periphery of the capillary structure defines a cavity. The capillary structure includes a composite part and a powder core part connected along the circumferential direction, and the composite part is formed by combining a braided wire bundle and a sintered powder. The powder core part is formed by sintering sintered powder.

[0004] One end of the heat pipe of the present application contacts the heat source through the surface of the metal tube on one side of the composite part. The heat source transfers heat to the capillary structure and the working fluid in the metal tube. The working fluid vaporizes and moves to the other end of the heat pipe under a small air pressure and dissipates heat and liquefies at this end. The braided wire harness of the composite part has good adsorption capacity for the working fluid, which is beneficial to improving the ability of the liquefied working fluid to move to the end in contact with the heat source, thereby improving the circulation heat dissipation capacity of the heat pipe when installed vertically.

[0005] In some possible implementations, the thickness of the composite portion is greater than the thickness of the powder core portion.

[0006] In some possible embodiments, the sintering powder consists of copper powder.

[0007] In some possible implementations, the inner wall of the metal tube is provided with protrusions distributed along the circumferential direction, and grooves are formed between adjacent protrusions.

[0008] In some possible implementations, the braided wire harness is braided from copper wires.

[0009] In some possible implementations, the heat pipe includes a first pipe segment, a second pipe segment, and an intermediate pipe segment connected along the length direction of the heat pipe. The first pipe segment is connected to the intermediate pipe segment in a folded manner, and the second pipe segment is connected to the intermediate pipe segment in a folded manner.

[0010] In some possible implementations, the metal pipe has a heat source surface, and the heat source surface is located on a side of the first pipe section close to the composite portion.

[0011] In some possible implementations, the working fluid is water, ethanol or acetone.

[0012] In some possible implementations, the diameter of the metal tube is greater than or equal to 2 mm.

[0013] In some possible implementations, in the composite part, the sintered powder is distributed between the gaps of the braided wire bundles. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 A front view of a heat pipe according to an embodiment of the present application;

[0016] Figure 2 A three-dimensional view of a heat pipe according to an embodiment of the present application;

[0017] Figure 3 This is a step diagram of a method for manufacturing a heat pipe according to an embodiment of the present application.

[0018] Description of main component symbols:

[0019] Heat pipe 100

[0020] Metal pipe 10

[0021] Heat source surface 101

[0022] The first pipe section 102

[0023] The second pipe section 103

[0024] Intermediate pipe section 104

[0025] Groove 105

[0026] Bump 1051

[0027] Inner wall 106

[0028] Working fluid 11

[0029] Capillary structure 12

[0030] Composite Department 121

[0031] Powder core 122

[0032] Eccentric cavity 13 DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be a centered element. When an element is considered to be "set on" another element, it may be directly set on the other element or there may also be a centered element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0036] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.

[0037] Example

[0038] See also Figure 1 The present embodiment provides a heat pipe 100, which includes a metal tube 10, a working fluid 11 and a capillary structure 12. The metal tube 10 has an inner wall 106, and the inner wall 106 is provided with protrusions 1051 distributed along the circumferential direction. The protrusions 1051 extend axially along the metal tube 10, and grooves 105 extending along the axial direction are formed between adjacent protrusions 1051. The capillary structure 12 is annular, and the outer periphery of the capillary structure 12 is connected to the inner wall 106 of the metal tube 10, and the inner periphery of the capillary structure 12 defines a cavity. The capillary structure 12 includes a composite part 121 and a powder core part 122 connected along the circumferential direction, and the composite part 121 is formed by combining a braided wire bundle 15 and a sintered powder 14. The powder core part 122 is formed by sintering the sintered powder 14.

[0039] In other embodiments, the metal tube has a smooth inner wall and a sintered capillary structure therein to form a heat pipe.

[0040] In this embodiment, the metal tube 10 is a round tube with a diameter greater than 2.0 mm, such as 6.0 mm, so that the temperature difference between the two radial sides of the metal tube 10 is large, which accelerates the evaporation and reflux speed of the working medium 11, thereby increasing the heat dissipation efficiency.

[0041] In this embodiment, the protrusions 1051 of the inner wall 106 are square in shape and are evenly spaced apart along the circumference of the metal tube 10 .

[0042] In this embodiment, the braided wire harness 15 in the composite part 121 has a strong adsorption force on the working medium 11, so that the working medium 11 on one side of the composite part 121 can flow back faster under the vertical anti-gravity state, thereby improving the reflux efficiency and enhancing the anti-gravity ability of the heat pipe 100.

[0043] This embodiment adopts a capillary structure 12 composed of a composite part 121 and a powder core part 122, and utilizes the greater adsorption force of the braided wire harness 15 in the composite part 121 on the working fluid 11 to make the working fluid 11 flow back faster, increase the heat dissipation efficiency in the vertical direction, and thus achieve the effect of anti-gravity.

[0044] See also Figure 2 The heat pipe 100 has a first pipe section 102, a second pipe section 103 and an intermediate pipe section 104. The first pipe section 102 is a square pipe, and the second pipe section 103 and the intermediate pipe section 104 are round pipes. The first pipe section 102 and the intermediate pipe section 104 are connected by bending, and the second pipe section 103 and the intermediate pipe section 104 are connected by bending. The heat pipe 100 has a heat source surface 101, and the heat source surface 101 is located on a side of the first pipe section 102 close to the composite part 121. The heat source surface 101 is used to directly contact the heat dissipation part of the heating element to transfer heat to the heat pipe 100.

[0045] In this embodiment, the heat pipe 100 can be placed horizontally for use, or can be placed vertically for use with the first pipe section 102 on the top and the second pipe section 103 on the bottom.

[0046] exist Figure 1 and Figure 2 Based on Figure 3 This embodiment also provides a method for manufacturing the heat pipe 100, which mainly includes the following steps:

[0047] Step A: Cut the metal tube 10 according to the design, and after cleaning the metal tube 10, insert a center rod into the metal tube 10 to shrink the tube and fix the end.

[0048] In this embodiment, the cut metal tube 10 has a plurality of protrusions 1051, and grooves 105 are formed between the protrusions 1051. The grooves 105 make the heat pipe 100 have a good permeability and can accelerate the backflow of the working medium 11.

[0049] Step B: insert the braided wire bundle 15 between the inner wall 106 of the metal tube 10 and the center rod, and then fill in the sintered powder 14 to fill the gap between the metal tube 10 and the center rod.

[0050] Step C: sintering the metal tube 10 to form a capillary structure 12.

[0051] Step D: Mark one side of the metal tube 10 close to the braided wire harness 15, pull out the center rod to form an eccentric cavity 13, and then shrink and weld the fixed end.

[0052] Step E: injecting the working fluid 11 into the metal tube 10 and evacuating the tube 10, shrinking the second tube section 103 and welding the tube 103.

[0053] Step F: bending the metal tube 10 to form a first tube segment 102 , a middle tube segment 104 and a second tube segment 103 .

[0054] In this embodiment, the braided wire bundle 15 and the sintered powder 14 are sintered together.

[0055] In other embodiments, the braided wire bundle 15 may be inserted and sintered first, and then the sintering powder 14 may be added and sintered, and the capillary structure 12 may be formed after two sinterings.

[0056] In this embodiment, the sintered powder 14 has a mesh size of 60-150, and is made of metal powder, ceramic powder or other polymer powder. The braided wire harness 15 is braided from copper wire or other metal wires.

[0057] In this embodiment, the capillary structure 12 of the heat pipe 100 has an eccentric structure design and two internal structures, so that the heat transfer efficiency inside the heat pipe 100 is higher, and the reflux speed of the working medium 11 is accelerated, which is less affected by gravity and has better anti-gravity ability.

[0058] Referring to Tables 1 to 3, a full-load heat pipe is often used in the usage scenario of this embodiment. The table shows a comparative experiment between the fully composite heat pipe and the heat pipe 100 of this embodiment. By comparing the difference between the working temperature and the ambient temperature in different working directions under the same power of the experimental equipment, Tables 1 to 3 can be obtained. It can be seen from Tables 1 to 3 that the heat dissipated by the fully composite heat pipe in the vertical state is less than that in the horizontal state. The heat dissipation efficiency of the fully composite heat pipe in the horizontal working state is worse than that of the heat pipe 100, and the heat dissipation efficiency decreases significantly in the vertical working state. Compared with the fully composite heat pipe, the heat dissipation efficiency of the heat pipe 100 in the horizontal direction is higher, and the heat dissipation efficiency in the vertical direction is roughly equivalent to the heat dissipation efficiency in the horizontal direction. The heat pipe 100 has excellent performance and good anti-gravity ability.

[0059] Table 1 Comparison of heat dissipation between the heat pipe 100 of this embodiment and the fully composite heat pipe in horizontal state

[0060]

[0061] Table 2 Comparison of heat dissipation between the new heat pipe 100 and the full composite heat pipe 100 in vertical state

[0062]

[0063] Table 3 Comparison of heat dissipation in the vertical direction relative to the horizontal direction between the heat pipe 100 of this embodiment and the all-composite heat pipe

[0064]

[0065] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A heat pipe, characterized in that: It includes a metal tube, a working fluid and a capillary structure; the capillary structure is annular, and the outer periphery of the capillary structure is connected to the inner wall of the metal tube, and the inner periphery of the capillary structure defines a cavity; the capillary structure includes a composite part and a powder core part connected along the circumferential direction, and the composite part is formed by combining a braided wire bundle and sintered powder; the powder core part is formed by sintering sintered powder.

2. The heat pipe according to claim 1, characterized in that: The thickness of the composite part is greater than the thickness of the powder core part.

3. The heat pipe according to claim 1, characterized in that: The sintered powder consists of copper powder.

4. The heat pipe according to claim 1, characterized in that: The inner wall of the metal tube is provided with protrusions distributed along the circumferential direction, and grooves are formed between adjacent protrusions.

5. The heat pipe according to claim 1, characterized in that: The braided wire harness is braided from copper wires.

6. The heat pipe according to claim 1, characterized in that: The heat pipe comprises a first pipe section, a second pipe section and an intermediate pipe section connected along the length direction of the heat pipe; the first pipe section is bent and connected to the intermediate pipe section, and the second pipe section is bent and connected to the intermediate pipe section.

7. The heat pipe according to claim 6, characterized in that: The metal pipe has a heat source surface, and the heat source surface is located on a side of the first pipe section close to the composite part.

8. The heat pipe according to claim 1, characterized in that: The working fluid is water, ethanol or acetone.

9. The heat pipe according to claim 1, characterized in that: The diameter of the metal tube is greater than or equal to 2 mm.

10. The heat pipe according to claim 1, characterized in that: In the composite part, the sintered powder is distributed between gaps of the braided wire bundles.

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