CN212645464U - Flat ultra-thin heat pipe with heat superconductivity - Google Patents

Abstract

A flat ultra-thin heat pipe with heat superconductivity comprises a pipe body with a sealed hollow flat space, wherein an evaporation end and a condensation end are arranged at two ends of the pipe body, a full section, a transition section and a hollow section are sequentially arranged along a steam flow path, and the steam space from the full section to the transition section and then to the hollow section is increased in a gradient manner; the tube body is internally provided with a first capillary structure and a second capillary structure, the first capillary structure extends to a condensation end from an evaporation end of the inner wall of the tube body, and the second capillary structure is attached to the inner wall of the tube body along an extension path of a full section to form a closed loop or extends to a transition section from the second capillary structure. The utility model discloses a powder sintering that the characteristic is good adds the capillary structure combination of copper silk bundle or copper wire knitting, makes ultra-thin type heat pipe have very good heat superconductivity on this mixed capillary structure, and the steam space is big, can obtain the best capillary rivers at level and inclination, can not peel off when bending and flattening, and the yield is high during production, can be applied to extensive volume production.

Description

Flat ultra-thin heat pipe with heat superconductivity

Technical Field

The utility model relates to a flat heat pipe technical field, in particular to flat ultra-thin type heat pipe with heat superconductivity, this heat pipe mainly are applied to the CPU heat dissipation module in the ultra-thin notebook, also can be applied to narrow space as heat-conducting element.

Background

The heat pipe is a heat conducting element which utilizes a heat conduction principle and a phase change medium to realize rapid heat transfer property, heat of a heating object is rapidly transferred to the outside of a heat source through the heat pipe, and the heat conducting capability of the heat pipe exceeds that of any known metal, so that the heat pipe is widely applied to electronic elements with larger heat productivity. When the heat pipe works, the low-boiling point working medium filled in the pipe body is evaporated and vaporized after the evaporation part absorbs heat generated by the heating electronic element, and vapor carries the heat to move to the condensation part, is liquefied and condensed in the condensation part and releases the heat to dissipate the heat of the electronic element. The liquefied working medium flows back to the evaporation part under the action of the capillary structure on the wall of the heat pipe, and is continuously evaporated, vaporized, liquefied and condensed, so that the working medium circularly moves in the heat pipe, and heat generated by the electronic element is continuously dissipated.

The capillary structure of the existing known heat pipe is composed of a woven mesh or sintered powder, the woven mesh is formed by weaving a plurality of metal wires into a planar mesh body, the woven mesh has the advantages that holes of the woven mesh are large, a large steam space can be provided, the reflux speed of working liquid in a horizontal state can meet requirements, but the capillary structure of the common woven mesh is not as good as the sintered powder, the working liquid is not easy to rapidly reflux in an inclined state, meanwhile, the woven mesh in the heat pipe is usually pressed at two ends of the heat pipe (CCI method), and after the heat pipe is bent and flattened, the woven mesh can be separated from the inner wall of the pipe body, so that the steam space is blocked, and the characteristic deterioration is caused; the advantage of adopting the sintering powder is that the powder is comparatively thin, can provide good capillary backward flow speed, and have the antigravity ability of preferred, still can possess good capillary backward flow speed under the tilt state promptly, but the whole heat pipe that adopts the sintering powder can't accurate control at the thickness of its heat dissipation end, the sintering powder extends to the heat dissipation end and makes the degree of difficulty great when the sintering, the too thick steam space that can reduce of sintering powder simultaneously, the radiating effect is poor, the too thin capillary space that can reduce of sintering powder, capillary backward flow is poor, want to produce and satisfy the sintering powder structure that possesses good steam space and capillary space at the heat dissipation end of heat pipe, its yields is too low, and is unsuitable for large-scale production and application.

Because the limitation of the product structure needs to make the heat pipe very thin, the space in the thin heat pipe is very small, the heat transfer and the heat dissipation of the heat pipe are realized by steam flow and capillary backflow, and in the application of the heat pipe, to improve the steam flow, more working liquid (pure water) needs to be filled, how to maximize the capillary space and the steam space of the heat pipe is the largest consideration of the design of the capillary structure of the ultrathin heat pipe.

In a utility model patent with application No. 201910079829.8 and patent name "heat pipe and manufacturing method thereof, and device containing the heat pipe" (hereinafter referred to as "comparison document 1") published by chinese patent CN109764708A in 2019, 05 and 17, a heat pipe (see fig. 1-4) is disclosed in comparison document 1, in which a metal mesh 2 is combined with a tube case 1 to form a gap filled with copper powder therebetween, the gap is filled with copper powder, the tube case 1 containing copper powder and the metal mesh 2 is sintered to form a sintered layer on the copper powder, and a capillary tube is obtained. Also can refer to other heat pipes that adopt combined type capillary structure now, realizing the utility model discloses an in-process, through inventor's research, experimental discovery, have following problem at least among the prior art: the prior art and the structure are adopted, the stable and reliable heat superconducting efficiency can not be realized in the ultra-thin heat pipe, and the adopted composite capillary structure has low yield and is not suitable for large-scale production and application.

In view of this, how to solve the problems of low heat conduction efficiency, unstable heat conduction characteristics, and low yield due to the limitations of the process and structure in the prior art becomes the subject to be researched and solved by the present invention.

Disclosure of Invention

The utility model discloses a be used for solving exist among the prior art because technology and structure limit heat pipe's heat conduction efficiency is low, heat conduction characteristic is unstable, the yields crosses low scheduling problem excessively, consequently provides the flat ultra-thin type heat pipe that has heat superconductivity, makes this ultra-thin type heat pipe have good heat conduction characteristic, good volume production, yield height moreover.

In order to achieve the above object, the utility model adopts a technical scheme that: the vacuum evaporation device comprises a tube body, the one end of body is the evaporating end, and the other end is the condensing end, has sealed cavity flat space in the body, and the encapsulation has working liquid in this cavity flat space, be provided with first capillary structure and second capillary structure in the cavity flat space, first capillary structure is copper silk bundle or copper wire knitting, the second capillary structure is the copper powder sinter, except that first capillary structure and the other spaces of second capillary structure form the steam space in the cavity flat space, its innovation point lies in:

defining a steam flow path of the pipe body extending to the condensing end along the evaporating end as a full section, a transition section and an empty section in sequence;

the first capillary structure extends from the evaporation end of the inner wall of the tube body to the condensation end through the full section, the transition section and the empty section; the first capillary structure is sintered and attached to the inner wall of the tube body;

the second capillary structure is arranged from the evaporation end of the inner wall of the tube body to the full section of the path or to the full section of the path and the transition section; the second capillary structure is sintered and attached to the inner wall of the tube body;

on the full section, the first capillary structure and the second capillary structure are connected with each other in the circumferential direction of the inner wall of the tube body and are arranged in a row in the circumferential direction of the inner wall of the tube body;

on the transition section, only the first capillary structure is arranged in the circumferential direction of the inner wall of the tube body, or the first capillary structure and the second capillary structure are arranged at intervals or in a connected manner in the circumferential direction of the inner wall of the tube body, and a gap is reserved in the circumferential direction of the inner wall of the tube body;

only the first capillary structures are arranged on the hollow section in the circumferential direction of the inner wall of the tube body, and gaps are reserved in the circumferential direction of the inner wall of the tube body;

a first steam space is formed on the full section by the first capillary structure and the second capillary structure; a second steam space is formed on the transition section by the first capillary structure and the inner wall of the pipe body or by the first capillary structure, the second capillary structure and the inner wall of the pipe body in a surrounding manner; a third steam space is formed on the hollow section by the first capillary structure and the inner wall of the tube body in a surrounding manner; the sectional areas of the first steam space, the second steam space and the third steam space are increased in a gradient manner in sequence.

The related content of the utility model is explained as follows:

1. in the description of the present application, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "thickness," "axial," "radial," "circumferential," and the like, as used herein, refer to an orientation or positional relationship illustrated in the drawings, which are used for convenience in describing the present application and to simplify description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.

2. Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

3. In the above technical scheme, the first capillary structure is a copper wire bundle or a copper wire braided fabric, the copper wire bundle is a bundle-shaped structure formed by copper wires, the copper wire braided fabric can be a 3D braided net or a 2D braided net or other braided structures, the first capillary structure adopting the 3D braided net structure can have the best water capillary flow effect, the 2D braided net or other bundle-shaped structures can also have a good capillary flow effect, and the requirement on the heat superconductivity of the heat pipe is met.

3. In the technical scheme, at the transition section, the second capillary structure is abutted against one side of the first capillary structure, and a continuous transition gap is formed by the first capillary structure and the second capillary structure in the circumferential direction of the inner wall of the tube body; at the transition section, the second capillary structures are abutted against two sides of the first capillary structure, and continuous transition gaps are formed on the circumferential direction of the inner wall of the tube body by the second capillary structures on the two sides of the first capillary structure; and at the transition section, the second capillary structure is far away from the first capillary structure, and the first capillary structure and the second capillary structure form a spaced transition gap in the circumferential direction of the inner wall of the tube body. The above three cases may have nearly equal volumes of vapor space at the transition section.

4. In the technical scheme, the first capillary structure is positioned on the flat surface of the hollow flat space of the tube body, so that the first capillary structure is prevented from being folded and flattened when being flattened, and the first capillary structure is further prevented from falling off. Meanwhile, in order to better control the consistent characteristics of the produced heat pipes and stabilize the quality performance, the thicknesses of the first capillary structure and the second capillary structure are equal.

5. In the above technical solution, the thickness range of the first capillary structure and the second capillary structure is between 0.2mm and 0.7 mm; the range of the wall thickness of the pipe body is 0.1mm to 0.3mm, and the pipe body can be used for making an ultra-thin heat pipe to be good in structural support.

Because of the application of above-mentioned scheme, compared with the prior art, the utility model have following advantage and effect:

1. adopt the utility model discloses a heat pipe and mixed capillary structure can fill more working liquids, improve the steam flow, and higher steam flow then means has higher heat superconducting characteristic.

2. The capillary phenomenon is improved by matching the first capillary structure and the second capillary structure, so that the flat ultra-thin heat pipe has good capillary water flow and better anti-gravity capillary water flow, the optimal capillary water flow at a horizontal angle and an inclined angle can be obtained, and the capillary water flow of copper wire bundles or copper wire braided fabrics is only required to be arranged at the heat dissipation end, so that the capillary is not required to be sintered, and the steam space of the heat dissipation end is improved.

3. The capillary structure combination of powder sintering and copper wire bundles or copper wire braided fabrics with good characteristics is adopted, so that the thin tube has very good heat superconductivity on the mixed capillary structure.

4. The mixed capillary structure is prepared by sintering the inner wall of the tube body and sintering powder as well as the tube body and copper wire bundles or copper wire braided fabrics together by a sintering process instead of pressing the braided nets at two ends, so that the sintering powder and the copper wire bundles or the copper wire braided fabrics can not be separated from the inner wall of the tube body after the bending and flattening in the production process of the heat pipe, and the characteristic deterioration is avoided.

5. Good volume production, yield are high, adopt above-mentioned structure, run through as the first capillary structure of copper silk bundle or copper wire knitting, and second capillary structure distributes in one side of full section and changeover portion of first capillary structure, compares current compound capillary structure, the utility model discloses a heat pipe yield when production is very high, can reach the yield of powder sintering pipe almost, can be applied to extensive volume production, and its defective rate is only thousandth.

6. The first capillary structure and the second capillary structure surround to form a first steam space, a second steam space and a third steam space, so that the steam space at the condensation end is far larger than other parts, and the first capillary structure extends to the third steam space to sufficiently meet the capillary water flow at the third steam space; simultaneously because full section arrives the changeover portion arrives again the steam space of void fraction is the gradient and increases, and the first evaporation space at full section department is after forming steam, because the first evaporation space of full section department is enough little, and steam pressure in first evaporation space is enough big, can make steam better must strike away under the effect of high pressure, consequently adopts the technical scheme of the embodiment of the utility model also can satisfy the very long heat pipe of length and use, its thermal superconductivity performance is better the longer length, and the heat pipe that exceeds certain length among the prior art just can lose efficacy when using almost.

Drawings

Fig. 1 is a schematic cross-sectional view of a flat ultra-thin heat pipe according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the heat pipe at A-A in FIG. 1 as a circular pipe;

FIG. 3 is a schematic cross-sectional view of the heat pipe of FIG. 1 at A-A during collapsing;

FIG. 4 is a schematic cross-sectional view of the heat pipe at B-B in FIG. 1 as a circular pipe;

FIG. 5 is a schematic cross-sectional view of the heat pipe at B-B of FIG. 1 during collapsing;

FIG. 6 is a schematic cross-sectional view of the heat pipe at B-B of FIG. 1 during collapsing;

FIG. 7 is a schematic three-sectional view of the heat pipe at B-B of FIG. 1 during collapsing;

FIG. 8 is a schematic cross-sectional view of the heat pipe at C-C in FIG. 1 as a circular pipe;

FIG. 9 is a schematic cross-sectional view of the heat pipe of FIG. 1 at C-C during collapsing;

fig. 10 is a schematic sectional view of a flat ultra-thin heat pipe according to an embodiment of the present invention;

fig. 11 is a schematic cross-sectional view of a flat ultra-thin heat pipe according to an embodiment of the present invention;

FIG. 12 is a top view of the heat pipe, the heating element, and the heat sink being horizontally disposed during comparison of the horizontal verification test of experiment one;

FIG. 13 is a front view of the heat pipe, the heating element, and the heat sink placed at an inclination angle of 90 degrees when the inclination angle verification test comparison of experiment two is performed;

FIG. 14 is a graph of Q-max trend obtained after comparison of horizontal validation tests;

FIG. 15 is a Q-max trend graph obtained after comparing the tilt angle verification tests.

The drawings are shown in the following parts:

1. a pipe body; 101. an evaporation end; 102. a condensing end; 111. a full segment; 112. a transition section; 113. a void section; 121. a first vapor space; 122. a second vapor space; 123. a third vapor space; 131. a transition gap;

2. a first capillary structure; 3. a second capillary structure;

4. a heating element; 5. and a heat sink.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

The present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the disclosure may be shown and described, and which, when modified and varied by the techniques taught herein, can be made by those skilled in the art without departing from the spirit and scope of the disclosure.

Example one

As shown in fig. 1 to 10, the first embodiment of the present invention provides a flat ultra-thin heat pipe with heat superconductivity, including a pipe body 1, one end of the pipe body 1 is an evaporation end 101, the other end is a condensation end 102, a sealed hollow flat space is provided in the pipe body 1, a working liquid is packaged in the hollow flat space, a first capillary structure 2 and a second capillary structure 3 are provided in the hollow flat space, the first capillary structure 2 is a copper wire bundle or a copper wire braided fabric, the second capillary structure 3 is a copper powder sintered material, the remaining spaces except the first capillary structure 2 and the second capillary structure 3 in the hollow flat space form a vapor space, wherein:

the pipe body 1 is sequentially provided with a full section 111, a transition section 112 and an empty section 113 along a steam flow path extending from the evaporation end 101 to the condensation end 102, and the steam space from the full section 111 to the transition section 112 and then to the empty section 113 increases in a gradient manner;

the steam flow path of the pipe body 1 extending from the evaporation end 101 to the condensation end 102 is defined as a full section 111, a transition section 112 and an empty section 113 in sequence;

the first capillary structure 2 is a 3D woven mesh composed of copper wires, the 3D woven mesh is a three-dimensional mesh body composed of unit copper wires woven in a vertically and horizontally staggered manner, and the first capillary structure 2 extends from an evaporation end 101 on the inner wall of the tube body 1 to a condensation end 102 through a full section 111, a transition section 112 and an empty section 113; the first capillary structure 2 is sintered and attached to the inner wall of the tube body 1;

the second capillary structure 3 is from the evaporation end 101 of the inner wall of the tube body 1 to the full section 111 and the transition section 112; the second capillary structure 3 is sintered and attached to the inner wall of the tube body 1;

on the full segment 111, the first capillary structure 2 and the second capillary structure 3 are connected with each other in the circumferential direction of the inner wall of the tube body 1, and are arranged in a full row in the circumferential direction of the inner wall of the tube body 1;

on the transition section 112, the first capillary structure 2 and the second capillary structure 3 are arranged at intervals or in a connected manner in the circumferential direction of the inner wall of the tube body 1, and a gap is left in the circumferential direction of the inner wall of the tube body 1, wherein the positions of the first capillary structure 2 and the second capillary structure 3 are schematically shown in fig. 1 and fig. 10;

on the hollow section 113, only the first capillary structure 2 is arranged in the circumferential direction of the inner wall of the tube body 1, and a gap is left in the circumferential direction of the inner wall of the tube body 1;

a first vapor space 121 is surrounded by the first capillary structure 2 and the second capillary structure 3 on the full section 111; a second vapor space 122 is formed on the transition section 112 by the first capillary structure 2, the second capillary structure 3 and the inner wall of the tube body 1; a third vapor space 123 is formed on the hollow section 113 by the first capillary structure 2 and the inner wall of the tube body 1; the sectional areas of the first steam space 121, the second steam space 122 and the third steam space 123 are sequentially increased in a gradient manner.

Example two

As shown in fig. 10, the second embodiment of the present invention provides a flat ultra-thin heat pipe with heat superconductivity, which comprises a pipe body 1, wherein one end of the pipe body 1 is an evaporation end 101, the other end is a condensation end 102, a sealed hollow flat space is provided in the pipe body 1, a working liquid is sealed in the hollow flat space, a first capillary structure 2 and a second capillary structure 3 are provided in the hollow flat space, the first capillary structure 2 is a copper wire bundle or a copper wire braided fabric, the second capillary structure 3 is a copper powder sintered substance, and the other spaces except the first capillary structure 2 and the second capillary structure 3 in the hollow flat space form a vapor space, wherein:

the steam flow path of the pipe body 1 extending from the evaporation end 101 to the condensation end 102 is defined as a full section 111, a transition section 112 and an empty section 113 in sequence;

the first capillary structure 2 is a 2D woven mesh composed of copper wires, the 2D woven mesh is a two-dimensional mesh structure composed of unit copper wires woven longitudinally and transversely, and the first capillary structure 2 extends from an evaporation end 101 on the inner wall of the tube body 1 to a full section 111, a transition section 112 and an empty section 113 until the condensation end 102; the first capillary structure 2 is sintered and attached to the inner wall of the tube body 1;

the second capillary structure 3 is from the evaporation end 101 of the inner wall of the tube body 1 to the full section 111; the second capillary structure 3 is sintered and attached to the inner wall of the tube body 1;

on the full segment 111, the first capillary structure 2 and the second capillary structure 3 are connected with each other in the circumferential direction of the inner wall of the tube body 1, and are arranged in a full row in the circumferential direction of the inner wall of the tube body 1;

on the transition section 112, only the first capillary structure 2 is arranged in the circumferential direction of the inner wall of the tube body 1, and a gap is left in the circumferential direction of the inner wall of the tube body 1, wherein the positions of the first capillary structure 2 and the second capillary structure 3 are schematically shown in fig. 11;

on the hollow section 113, only the first capillary structure 2 is arranged in the circumferential direction of the inner wall of the tube body 1, and a gap is left in the circumferential direction of the inner wall of the tube body 1;

a first vapor space 121 is surrounded by the first capillary structure 2 and the second capillary structure 3 on the full section 111; a second vapor space 122 is formed on the transition section 112 by the first capillary structure 2 and the inner wall of the tube body 1; a third vapor space 123 is formed on the hollow section 113 by the first capillary structure 2 and the inner wall of the tube body 1; the sectional areas of the first steam space 121, the second steam space 122 and the third steam space 123 are sequentially increased in a gradient manner.

The utility model discloses principle and the working process reference of flat ultra-thin type heat pipe with heat superconductivity as follows:

in the flat ultra-thin heat pipe of the embodiment of the present invention, the vapor space is formed in the hollow flat space of the pipe body 1 except the first capillary structure 2 and the second capillary structure 3, the vapor space from the full section 111 to the transition section 112 to the empty section 113 increases in a gradient manner, and the vapor pressure at the full section 111 is increased while the vapor space is increased; the parts of the first capillary structure 2 and the second capillary structure 3 in the hollow flat space of the tube body 1 form a capillary water flow space, the capillary water flow space from the full section 111 to the transition section 112 to the empty section 113 is reduced in a gradient manner, the first capillary structure 2 penetrating to the empty section 113 provides fine capillary water flow with good capillary property, and the second capillary structure 3 at the transition section 112 is combined to further improve the capillary water flow with anti-gravity property. When the heat pipe works, in a vacuum environment, working liquid in the evaporation end 101 is heated and immediately vaporized, formed steam is diffused from the evaporation end 101 to the condensation end 202, the steam is diffused to the condensation end 202 through the first steam space 121, the second steam space 122 and the third steam space 123, the steam diffused to the condensation end 202 releases heat and condenses into a liquid state at the section, and then flows back to the evaporation end 101 along the first capillary structure 2 and the second capillary structure 3 on the inner wall of the pipe body 1, and the reciprocating circulation acts in such a way, so that heat is quickly transferred from the evaporation end to the condensation end and is dissipated.

By adopting the embodiment, the heat pipe has very high heat conduction efficiency while realizing an ultra-thin heat pipe structure, and still has good heat conduction performance under various use states such as horizontal and inclined states, and the heat pipe structure is mainly realized by the combination of the following structural characteristics:

1. the combination of the copper wire bundle or the copper wire braided fabric with good water capillary flow effect and the sintering powder with better antigravity capillary flow is adopted, so that the capillary structure in the heat pipe can have good water capillary flow effect and better antigravity capillary flow performance.

2. The best capillary water flow effect in the horizontal direction or the inclined direction can be obtained by combining the copper wire bundles or the copper wire braided fabric and the sintering powder.

3. A first vapor space 121 is formed by the first capillary structure 2 and the second capillary structure 3 in a surrounding manner, a second vapor space 122 is formed by the first capillary structure 2 and the second capillary structure 3 or the pipe body 1 in a surrounding manner, and a third vapor space 123 is formed by the first capillary structure 2 and the pipe body 1 in a surrounding manner, so that the vapor space at the condensation end 102 is far larger than other parts, and the first capillary structure 2 extends to the third vapor space 123 to sufficiently meet the capillary water flow at the position; simultaneously because full section 111 to changeover portion 112 arrives again empty section 113's steam space is the gradient and increases, and first evaporation space 123 in full section 111 department is after forming steam, because first evaporation space 123 of full section 111 department is enough little, and steam pressure in first evaporation space 123 is enough big, can make steam better must strike away under the effect of big pressure, consequently adopts the technical scheme of the embodiment of the utility model also can satisfy the very long heat pipe of length and use, and its heat superconductivity performance is better the longer the length, and the heat pipe that exceeds certain length among the prior art just can become invalid when using almost.

4. It can be seen from the third point that the embodiment of the present invention is characterized in that the copper wire bundle or the copper wire braided fabric penetrating to both ends and the sintering powder sintered to the middle section are adopted, so that the heat pipe has very good thermal superconducting characteristics on the capillary structure.

5. The mixed capillary structure adopts a sintering process, so that the inner wall of the tube body 1 and sintering powder as well as the tube body 1 and copper wire bundles or copper wire braided fabrics are sintered together, rather than the method of pressing and weaving meshes at two ends, therefore, after bending and flattening, the sintering powder and the copper wire bundles or the copper wire braided fabrics cannot be separated from the inner wall of the tube body 1, and the characteristic deterioration is avoided.

With respect to the above embodiments, the changes that may be made by the present invention are described as follows:

1. in the above embodiment, the structure and position relationship of the first capillary structure 2 and the second capillary structure 3 at the transition section 112 can be as follows: referring to fig. 5, at the transition section 112, the second capillary structure 3 is close to one side of the first capillary structure 2, and a continuous transition gap 131 is formed between the first capillary structure 2 and the second capillary structure 3 in the circumferential direction of the inner wall of the tube body 1; referring to fig. 6, at the transition section 112, the second capillary structures 3 abut against two sides of the first capillary structure 2, and a continuous transition gap 131 is formed in the circumferential direction of the inner wall of the tube body 1 by the second capillary structures 3 on two sides of the first capillary structure 2; referring to fig. 7, at the transition section 112, the second capillary structure 3 is far away from the first capillary structure 2, and the first capillary structure 2 and the second capillary structure 3 form a transition gap 131 spaced in the circumferential direction of the inner wall of the tube body 1. These three cases may have nearly equal volumes of vapor space.

2. In above-mentioned embodiment one and embodiment two, first capillary structure 2 is the copper wire knitting, and this kind of copper wire knitting can be 3D mesh grid, and the first capillary structure 2 that adopts 3D mesh grid structure can possess best water capillary water flow effect, but the utility model discloses not so limit, first capillary structure 2 also can be 2D mesh grid or other copper strand structure, and 2D mesh grid is the two-dimensional network structure that constitutes for the unit copper wire of weaving by moving about freely and quickly, and the copper strand then is the bundle column structure of constituteing by the copper wire.

3. In the above embodiment, the thickness of the first capillary structure 2 and the second capillary structure 3 ranges from 0.2mm to 0.7mm, and the thickness of the specific first capillary structure 2 and the specific second capillary structure 3 can be selected from 0.2mm, 0.3mm, 0.5mm, 0.6mm or 0.7 mm; the range of the wall thickness of body 1 is between 0.1mm to 0.3mm, and specifically, the wall thickness of body 1 can select 0.1mm, 0.15mm, 0.2mm, 0.25mm or 0.3 mm.

In order to verify the utility model discloses hot superconducting characteristic, the utility model discloses the people has carried out the heat conductivity test experiment, and in order to ensure reliability and the uniformity of test result, the heat pipe of test is all flattened into the flat type heat pipe that thickness is 1.5mm by the heat pipe that the specification is phi 8 x 225mm, and the body of heat pipe is the copper pipe. The heat pipe as the contrast group is the full powder heat pipe, and the notion of full powder heat pipe is the attached qualified sintering powder of the whole sintering of inner wall of this heat pipe, and the sintering powder is the copper powder, and the heat pipe of test group adopts the heat pipe of half powder + copper mesh, adopts promptly the utility model discloses embodiment one flat ultra-thin type heat pipe with heat superconductivity, the evaporating end 101 to the condensation end 102 of heat pipe are run through to first capillary structure 2 made by 3D mesh grid, second capillary structure 3 made by the powder sintering then only is located full section 111 and partial changeover portion 112. It should be noted that the heat pipe made of the mesh woven only has no thermal superconducting property in the tilt angle state, and therefore the test was performed using only the whole powder heat pipe as a control group.

During testing, the evaporation end of the flat heat pipe is placed on the heating element 4, the condensation end of the flat heat pipe is placed on the radiating fin 5, and the heating power of the heating element 4 can be adjusted. The relevant parameters of the test are interpreted as: p is heating power (W) of the heating body; tc: the temperature of the heating element (. degree. C.); ta: ambient temperature (. degree. C.); rc: thermal resistance (. degree. C./W), and Rc ═ Tc-Ta)/P.

Experiment I, horizontal verification test comparison:

the heat pipe that sample 1, sample 2, sample 3 adopted is the full powder heat pipe, and sample 4 adopts the embodiment one flat ultra-thin type heat pipe with heat superconductivity, when carrying out the level verification test contrast, the mode of test is for placing heat-generating body 4, fin 5 and flat type heat pipe level, and the plan view that the level was placed refers to fig. 12, and the test time of every test power is about 600 seconds, and the result of level verification test contrast is seen in table 1 and fig. 14.

TABLE 1

Table 1 shows the results of comparison of the horizontal verification test, and the Q-max trend chart of the results is shown in fig. 14, which shows that table 1 and fig. 14:

1. in the horizontal test of the water quantity of 0.98cc of the whole powder sample 1, the maximum test power is 30W, the thermal resistance is 2.06 ℃/W under the heating power of 30W, and after the test power is adjusted to 35W, the temperature Tc of the heating element is measured to be always increased and cannot be stably balanced;

2. in the horizontal test of the water amount of 1.00cc of the whole powder sample 2, the maximum test power is 30W, the thermal resistance is 1.93 ℃/W under the heating power of 30W, and after the test power is adjusted to 35W and 40W, the temperature Tc of the heating element is measured to be increased all the time and cannot be stably balanced;

3. in the horizontal test of the water quantity of 1.04cc of the whole powder sample 3, the maximum test power is 35W, the thermal resistance is 1.79 ℃/W under the heating power of 35W, and after the test power is adjusted to be 40W and 45W, the temperature Tc of the heating element is measured to be increased all the time and cannot be stably balanced;

4. in the horizontal test of the water amount of 0.97cc, the maximum test power of the semi-powder and copper mesh sample 4 is 60W, the thermal resistance is 0.89 ℃/W under the heating power of 60W, and the thermal resistance value is kept between 0.89 and 0.94 under the condition that the test power range is between 25W and 60W.

The first conclusion of the experiment is as follows: can learn through the test data of experiment one, adopt the embodiment one flat ultra-thin type heat pipe with heat superconductivity in the test contrast is verified to the level, all can keep a lower and stable thermal resistance under different test power P (W), and the whole powder sample can only just exert its heat conductivility under lower power, and thermal resistance numerical value compares sample 4 and will be higher than nearly one time, has shown the adoption the utility model discloses a flat ultra-thin type heat pipe possesses good heat superconductivity under the horizontality.

Experiment two, the test comparison of the inclination angle verification:

the heat pipes adopted by the samples 7 and 8 are all-powder heat pipes, the samples 5 and 6 adopt the flat ultra-thin heat pipe with heat superconductivity, and when the inclination angle verification test comparison is performed, the test mode is that the heating element 4 is placed above the heat pipe, the radiating fin 5 is placed below the heat pipe, so that the integral inclination angle of the flat heat pipe is 90 degrees, the flat ultra-thin heat pipe is used for testing the heat conduction performance of the heat pipe in the extreme inclination angle state, meanwhile, the test samples are required to have no abnormal sound under the condition that the inclination angle is 90 degrees (when the water quantity of the heat pipe is too much, the sound of ticking is generated during the angle test, the qualified product of the utility model is not allowed to have the abnormal sound, so the abnormal sound is required to be absent, the front view that the inclination angle is 90 degrees refers to the attached figure 13, and the test time of each test power is about 600 seconds, see table 2 and fig. 15 for results of the tilt angle validation test alignment.

TABLE 2

Table 2 shows the results of the oblique angle verification test comparison, and the Q-max trend graph of the results is shown in fig. 15, which can be seen from table 2 and fig. 15:

1. in the 90-degree inclination angle test with the water amount of 0.97cc, the maximum test power of the half powder and the copper mesh sample 5 is 35W, the thermal resistance is 1.64 ℃/W under the heating power of 35W, and after the test power is adjusted to 40W, the temperature Tc of the heating element is measured to be always increased and cannot be stably balanced;

2. in the 90-degree inclination angle test with the water amount of 1.0cc, the maximum test power of the half powder and copper mesh sample 6 is 40W, the thermal resistance is 1.61 ℃/W under the heating power of 40W, and after the test power is adjusted to 45W, the temperature Tc of the heating element is measured to be always increased and cannot be stably balanced;

3. in a 90-degree inclination angle test with the water amount of 0.98cc, the maximum test power of the whole powder sample 7 is 20W, the thermal resistance is 2.68 ℃/W under the heating power of 20W, and after the test power is adjusted to be 25W, the temperature Tc of the heating element is measured to be increased all the time and cannot be stably balanced;

4. in the 90-degree inclination angle test of the water amount of 1.04cc, the maximum test power of the whole powder sample 8 is 25W, the thermal resistance is 2.10 ℃/W under the heating power of 25W, and after the test power is adjusted to 30W, the temperature Tc of the heating element is measured to be increased all the time and cannot be stably balanced.

Conclusion of experiment two: as can be known from the test data of the second experiment, in the comparison of the 90-degree inclination angle test of the flat ultra-thin heat pipe with heat superconductivity of the first embodiment of the utility model, the maximum test power under the simulated use scene of the inclination angle of 90 degrees is higher than that of the whole powder sample by 20W, the whole powder sample is only 20W and 25W, and the thermal resistance value is higher, which shows that the whole powder sample has heat conduction effect only in low-power use under the condition of 90-degree inclination angle, and the utility model discloses a flat ultra-thin type heat pipe then can reach 35W, 40W, even under maximum test power moreover, the utility model discloses a flat ultra-thin type heat pipe has 1.64 ℃/W, 1.61 ℃/W's preferred thermal resistance according to the old, has shown the adoption the utility model discloses a flat ultra-thin type heat pipe still possesses the heat superconductivity of preferred under the extreme use condition at 90 inclinations, can satisfy its heat superconductivity performance of performance under certain inclination.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (10)

1. The utility model provides a flat ultra-thin type heat pipe with heat superconductivity, includes body (1), the one end of body (1) is evaporating end (101), and the other end is condensation end (102), has sealed cavity flat space in body (1), and the work liquid is equipped with to this cavity flat space internal packing, be provided with first capillary structure (2) and second capillary structure (3) in the cavity flat space, first capillary structure (2) are copper silk bundle or copper wire knitting, second capillary structure (3) are the copper powder sinter, all the other spaces except first capillary structure (2) and second capillary structure (3) in the cavity flat space form steam space, its characterized in that:

a steam flow path of the pipe body (1) extending from the evaporation end (101) to the condensation end (102) is defined as a full section (111), a transition section (112) and an empty section (113) in sequence;

the first capillary structure (2) extends from an evaporation end (101) of the inner wall of the tube body (1) to a condensation end (102) through a full section (111), a transition section (112) and a hollow section (113); the first capillary structure (2) is sintered and attached to the inner wall of the tube body (1);

the second capillary structure (3) is from the evaporation end (101) of the inner wall of the tube body (1) to the full section (111) of the path or to the full section (111) and the transition section (112) of the path; the second capillary structure (3) is sintered and attached to the inner wall of the tube body (1);

on the full section (111), the first capillary structure (2) and the second capillary structure (3) are connected with each other in the circumferential direction of the inner wall of the tube body (1), and are arranged in a row in the circumferential direction of the inner wall of the tube body (1);

on the transition section (112), only the first capillary structures (2) are arranged on the circumferential direction of the inner wall of the tube body (1), or the first capillary structures (2) and the second capillary structures (3) are arranged at intervals or in a connected mode on the circumferential direction of the inner wall of the tube body (1), and gaps are reserved on the circumferential direction of the inner wall of the tube body (1);

on the hollow section (113), only the first capillary structure (2) is arranged on the circumferential direction of the inner wall of the tube body (1), and a gap is reserved on the circumferential direction of the inner wall of the tube body (1);

a first vapor space (121) is surrounded by the first capillary structure (2) and the second capillary structure (3) on the full section (111); a second vapor space (122) is formed on the transition section (112) by surrounding the first capillary structure (2) and the inner wall of the tube body (1) or by surrounding the first capillary structure (2), the second capillary structure (3) and the inner wall of the tube body (1); a third steam space (123) is formed on the hollow section (113) by the first capillary structure (2) and the inner wall of the pipe body (1) in a surrounding manner; the cross-sectional areas of the first steam space (121), the second steam space (122) and the third steam space (123) increase in a gradient manner.

2. The flat ultra-thin heat pipe with thermal superconductivity of claim 1, wherein: the first capillary structure (2) is a 3D woven net composed of copper wires, and the 3D woven net is a three-dimensional net body composed of unit copper wires which are woven in a vertically and horizontally staggered mode.

3. The flat ultra-thin heat pipe with thermal superconductivity of claim 1, wherein: the first capillary structure (2) is a 2D woven mesh composed of copper wires, and the 2D woven mesh is a two-dimensional mesh structure composed of unit copper wires woven longitudinally and transversely.

4. The flat ultra-thin heat pipe with thermal superconductivity of claim 1, wherein: at the transition section (112), the second capillary structure (3) is abutted against one side of the first capillary structure (2), and a continuous transition gap (131) is formed by the first capillary structure (2) and the second capillary structure (3) in the circumferential direction of the inner wall of the tube body (1).

5. The flat ultra-thin heat pipe with thermal superconductivity of claim 1, wherein: at the transition section (112), the second capillary structures (3) are abutted against two sides of the first capillary structure (2), and a continuous transition gap (131) is formed on the circumference of the inner wall of the tube body (1) by the second capillary structures (3) on two sides of the first capillary structure (2).

6. The flat ultra-thin heat pipe with thermal superconductivity of claim 1, wherein: at the transition section (112), the second capillary structure (3) is far away from the first capillary structure (2), and the first capillary structure (2) and the second capillary structure (3) form a transition gap (131) at intervals in the circumferential direction of the inner wall of the tube body (1).

7. The flat ultra-thin heat pipe with heat superconductivity as claimed in any one of claims 1 to 6, wherein: the first capillary structure (2) is positioned on the flat surface of the hollow flat space of the tube body (1).

8. The flat ultra-thin heat pipe with thermal superconductivity of claim 7, wherein: the first capillary structure (2) and the second capillary structure (3) are equal in thickness.

9. The flat ultra-thin heat pipe with thermal superconductivity of claim 8, wherein: the thickness of the first capillary structure (2) and the second capillary structure (3) ranges from 0.2mm to 0.7 mm.

10. The flat ultra-thin heat pipe with thermal superconductivity of claim 8, wherein: the range of the wall thickness of the pipe body (1) is 0.1mm to 0.3 mm.

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