1260389 九、發明說明： 【發明所屬之技術領域】 本發明係與熱管相關，尤其涉及一種熱管的絲網型多孔結構及其 製造方法。 【先前技術】 : 隨著大型積體電路技術之不斷進步及廣泛應用，高頻高速處理器 馨不斷推出。由於高頻高速運行使得處理器單位時間產生大量熱量，如 不及時排除這些熱量將引起處理器自身溫度之升高，對系統之安全及 性能造成很大影響，目前散熱問題已經成為新—代高速處理器推出時 必需解決之問題。 由於對散減求稍提高，新式散紐置不斷出現。將熱管應用 於電子元件散熱就是其中-種，其係、夜體在氣、液兩態間轉變時 溫度保持不變而可做或放出大量熱量之原理工作，—改傳統散熱器 • 料以金屬熱傳導方式散熱而效率有限之狀況。熱管係於-密封低壓 ^形设體内盛裝適量汽化熱高、流紐好、化報質穩定、沸點較低 之液心物貝如水、乙醇、丙畴，利用該液態物質受熱和冷卻而在 氣、液兩態間輕時，做姐以餘“使熱量由管體—端迅速 傳到另一端。 般於熱&内壁面上設置多孔結構，藉由該多孔結構產生毛細作 用力驅動冷凝後之液體回流。絲網型多孔結構為一種常用 之多孔結 構’其係藉由編財法縣線編織成峨，_轉之關孔隙產生 6 1260389 毛細作用力。_細_力财孔結構⑽大小成反比即孔隙之 越]毛、、田作用力越大，因此為達到較大之毛細作用力而便於液體 回流，所使用之多孔材料層孔隙之孔徑越小越好。然，由於流體在流 動過^中通過流道之孔购小，流體所受之摩擦阻力及歸力越大， 使知液體κ阻力增加、流速變小。當熱管魏熱量之端部吸 收’、、、星曰加日守’务發加快’而液體由於回流阻力而速度減小，可能造 成無法迅速補充吸熱端之蒸發液體，從而造成乾燒，損壞熱管。因此 如何平衡毛細制力與液體回流阻力之影響，藉以提昇鮮性能，即 成為業界急需解決之問題。 【發明内容】 為促幵熱管性能，本發明提供一種兼具有高毛細力及低回流阻力 之熱管多孔結構及其製造方法。 該熱管多孔結構係包括由絲線編織而成之絲網，該多孔結構具有 不同孔徑大小之孔隙，且其孔隙大小沿一方向呈梯度分佈。 根據本發明的一個實施方式，所述多孔結構包括多數沿徑向佈置 之絲網層，兩相鄰層具有不同大小之孔隙，從而所述孔隙大小沿熱管 徑向呈梯度分佈。 根據本發明的另一實施方式，所述多孔結構沿熱管縱向包括多個 部分，兩相鄰部分之孔隙大小不同，從而使得孔隙大小沿熱管縱向呈 梯度分佈。 熱管多孔結構之製造方法係將具有大小不同之網目孔隙之片狀絲網 7 1260389 捲成筒狀絲網，使得所述絲網之孔隙大小沿徑向或縱向呈梯度分佈， 然後將所述筒狀絲網置入熱管管體内。 根據本發明的一個實施方式，所述筒狀絲網同軸地沿徑向排佈， 且兩相鄰之筒狀絲網具有不同之孔隙大小從而使多孔結構形成孔徑大 小沿徑向梯度分佈之孔隙。 根據本發明的另一個實施方式，所述筒狀絲網同軸地沿縱向排 佈，且兩相鄰之筒狀絲網具有不同之孔隙大小從而使多孔結構形成孔 徑大小沿縱向梯度分佈之孔隙。 上述熱管多孔結構由於具有孔徑大小沿徑向或縱向呈梯度分佈之 孔隙，因此可以同時具有大小孔隙之優點，同時達到較高毛細力及較 低回流阻力，進而提昇熱管性能。 【實施方式】 下面參照附圖’結合實施例作進一步說明。 如第一圖所示，熱管10包括一管體20,與該管體20内壁面緊密 接觸之多孔結構30及填充於管體20内之工作液體。 管體20由導熱性能良好之金屬材料製成，如銅等，管體2〇之橫 截面呈圓形’可以理解地，官體2Q之橫截面也可為其它形狀，如方形， 夕邊幵/ ’侧形等，官體2〇内填充之工作液體一般採用低彿點之液體， 如水、酒精等。 夕孔、構3〇由一層厚度大致相等且相互緊密接觸之絲網構成，沿 熱管之徑向向外分別為内層絲網4Q、中層絲網5g、外層絲網6〇，其中 8 1260389 外層絲網6G與管體2G之内壁面緊密接觸。各層絲網均由銅、不錢鋼、 鐵絲或其它金屬線編織喊，各絲線之間形成細小且致密之孔隙，從 而形成多孔結構提供毛細力，在實際應用中可根據絲網材質與工作液 體之相溶性來確定’保證絲網與工條體之間不會發生化學反應。 上述各層絲網具有不同孔徑之孔隙，在本實施方式中，内層絲網 40孔隙最大，中層絲網5〇次之，外層絲網6〇孔隙最小，從而使得多 孔結構30沿熱管10之徑向形成梯度變化之孔隙分佈。熱管ι〇工作時， 利用多孔結構30孔隙之梯度變化來調整熱管性質，達到毛細高壓力差 及低流阻之功效，提昇熱管10性能。 多孔結構30並不限於上述實施方式，如第二圖所示，熱管21〇之 多孔結構230包括沿熱管210之徑向向外分層設置之内層絲網24〇、中 層絲網250及外層絲網260，其中外層絲網260孔隙最大，中層絲網 250次之，内層絲網24〇孔隙最小，從而使得多孔結構23〇沿熱管1〇 之径向形成梯度變化之孔隙分佈。此外，還可以設置成内外層絲網孔 隙大小相同，而中層絲網與内外層絲網孔隙大小不同。 貝際應用時，還可根據需要設定絲網之層數及孔隙之大小分佈， 只要多孔結構包括兩層以上之絲網結構，兩相鄰絲網層具有大小不同 之孔隙分佈即可於熱管内形成沿熱管徑向呈梯度變化之孔隙結構。 另外，以上所述多孔結構各層之厚度大致相等，實際上可根據需 要δ又计不同厚度之多孔結構，如第三圖所示，熱管31〇之多孔結構刃〇 中，内層絲網340厚度最小，中層絲網35〇厚度最大，外層絲網36〇 1260389 厚度居於内層絲網340與外層絲網350之間。 以上介紹的是具有徑向孔隙梯度之熱管多孔結構，下面再以實施 例說明一種具有縱向孔隙梯度之熱管多孔結構。 如第四圖所示，熱管41〇具有蒸發段、絕熱段及冷凝段，熱管多 孔結構430對應該蒸發段、絕熱段及蒸發段分別設有第一段44〇、第二 & 450及第二段460。該三段中兩相鄰段具有大小不同之孔隙。本實施 方式中，第一段440孔隙最大，第二段45〇其次，第三段孔隙最小， 從而在縱向上形成梯度孔隙。 縱向梯度還可有其他方式，如第五圖所示，第一段54〇孔隙最小， 第三段560孔隙最大，而第二段55〇孔隙大小居於第一段54〇及第三 段560之間。 如第六圖所示’第-段64〇及第三段㈣孔隙大小婦，而第二 段650孔隙大於其他兩段之孔隙。 在第四圖至第六圖所示之熱管多孔結構中，三段沿熱管縱向之長 度大致相等。實際應用中，可適當改變各段之長度。 第七圖為上述具有梯度孔隙分佈之熱管多孔結構之製造方法流程 圖。該製造方法包括以下步驟：魏提供所需片狀絲網，其次將片狀 絲網捲成適合熱管管體_之筒狀，然後將筒狀絲網置人熱管管體内 並作固定處理。 下面結合第八圖至第十圖，係以第一圖所示之熱管多孔結構％為 例’詳細介紹熱管多孔結構之製造方法。 1260389 0月參考第八圖，首先提供三張片狀絲網30a、30b、30c，每〆片狀 絲網具有單—孔徑大小之孔隙，且片狀絲網30a孔隙最大，絲網30b 孔隙其次，絲網30c孔隙最小。 再參考第九圖，將上述三張片狀絲網3〇a、3此、3〇c依次捲設至 一拉桿1〇〇之外表面形成筒狀，形成三層之層狀多孔結構 ，且絲網30a 位於最内層，絲網3〇c位於最外層，絲網3〇b位於中間層，這樣即可 幵/成&彳二向向外具有梯度孔隙大小之多孔結構。該拉桿川〇為一橫截 面壬圓形之貫心硬質棒體，如不銹鋼棒體。為捲設出與管體2〇之橫載 面相適應之筒狀絲網30，拉桿⑽之橫載面形狀也可為其它形狀，如 橢圓、方形、三角形等。 然後請參考第十圖，將筒狀絲網與拉桿100-並置入管體20内。 取後’對上韻狀絲網侧定處理。通賴已置人筒狀絲網之管 體20進行加溫，使筒狀絲網產生局部溶融，藉此局部炫融使筒狀絲網 與管壁結合在-起，從而形成如第—_示之多孔結構Μ。此過程中 可以將拉桿100於加溫之前取出，也可待加溫完成之後再將拉桿1〇〇 取出。 可以理解，上述介紹方法的實施例中，若調整片狀絲網3〇a、3〇b 及30c捲設的級順序，即可得到具有不同梯度孔隙之多孔結構。 上述方法中，各片狀絲網3〇a、通及3〇c是同轴地沿徑向排佈於 拉杯100外表面’攸而件到具有徑向梯度孔隙分佈之熱管多孔結構。 請參考第十-圖，係說明_種製造具有縱向梯度孔隙分佈之熱管多孔 11 1260389 結構之方法。該方法是將具有不同孔隙之三片絲網3〇a、3〇b及耽 依次捲設於拉桿满外表面，但與前述方法不同的是，該三片絲網 30A、30B及3GC是同軸地沿縱向排佈於拉桿⑽外表自，從而形成沿 縱向呈梯度分佈之孔隙。同樣，改變絲網3QA、細及夏的值置可 得到具有不同梯度孔隙之多孔結構。 以上係以三層或三段纽結構為例介紹具有梯度孔隙分佈之多孔 結構之製作方法’可紐解，以上方法還可制於多於多於三層或三 段之多孔結構之製作。 綜上所述，本發明符合發明專利要件，爰依法提出專利申請。惟， 以上所述者僅為本發明之紐實細，舉凡熟悉本紐藝之人士，在 爰依本發明精神所作之等效修飾或變化，皆應涵蓋於以下之中請專利 範圍内。 【圖式簡單說明】 第-圖至第六圖分職不同實施方紅熱管纽結構沿熱管縱向 之截面示意圖。 第七圖係熱管多孔結構製造流程圖。 第八圖翻於製造熱管多孔結構之絲網示意圖。 第九圖係絲網捲設於一技桿之示音圖。 第十圖係絲網置入熱管管體之示意圖。 第十-圖係絲網捲設於拉桿之另一方式之示意圖。 【主要元件符號說明】 12 1260389 执管 10、210、310、410、510、610 管壁 20 多孔結構 30、230、430、530、630 内層絲網 40、240、340 中層絲網 50、250、350 外層絲網 60、260、360 第一段 440、540、640 第二段 450、550、650 第三段 460、560、660 片狀絲網 30a、30b、30c 拉桿 100 131260389 IX. Description of the Invention: [Technical Field] The present invention relates to a heat pipe, and more particularly to a wire mesh type porous structure of a heat pipe and a method of manufacturing the same. [Prior Art]: With the continuous advancement and wide application of large-scale integrated circuit technology, high-frequency high-speed processors are constantly being introduced. Due to the high-frequency high-speed operation, the processor generates a large amount of heat per unit time. If the heat is not removed in time, the temperature of the processor itself will rise, which has a great impact on the safety and performance of the system. At present, the heat dissipation problem has become a new-generation high-speed. The problem that must be solved when the processor is launched. Due to the slight increase in the reduction, the new type of distribution has been constantly appearing. The application of heat pipes to the heat dissipation of electronic components is one of them. The system and the night body keep the temperature constant during the transition between gas and liquid, and can work or release a large amount of heat. Heat conduction heat dissipation and limited efficiency. The heat pipe is sealed in a low-pressure type, and contains a proper amount of vaporization heat, good flow, stable quality, low boiling point, such as water, ethanol, and propylene domains, and the liquid substance is heated and cooled. When the gas and liquid states are light, the sister will "make the heat transfer from the pipe body to the other end quickly. The porous structure is formed on the inner wall of the heat and the inner wall surface, and the capillary action is used to drive the condensation. After the liquid is recirculated. The mesh-type porous structure is a commonly used porous structure, which is woven into a crucible by the braided method county line, and the _ turn to the pores produces 6 1260389 capillary force. _ fine_力财孔结构(10) The inverse of the size, that is, the more the pores, the greater the force of the hair and the field, so in order to achieve a larger capillary force and facilitate the liquid reflux, the pore size of the pores of the porous material layer used is preferably as small as possible. When the flow passes through the hole of the flow passage, the frictional resistance and the returning force of the fluid are increased, so that the liquid κ resistance increases and the flow velocity becomes smaller. When the end of the heat pipe Wei heat absorbs ',,, and The Japanese Guardian’s The speed of the body is reduced due to the backflow resistance, which may result in the inability to quickly replenish the evaporating liquid at the endothermic end, thereby causing dry burning and damaging the heat pipe. Therefore, how to balance the influence of the capillary force and the liquid backflow resistance, thereby improving the fresh performance, becomes an urgent need in the industry. The present invention provides a heat pipe porous structure having both high capillary force and low reflux resistance and a method for manufacturing the same. The heat pipe porous structure includes a wire woven from a wire. a mesh having pores of different pore sizes and having a pore size distributed in a direction in a direction. According to an embodiment of the invention, the porous structure comprises a plurality of radially arranged screen layers, two adjacent layers There are different sizes of pores, so that the pore size is distributed in a radial direction along the heat pipe. According to another embodiment of the present invention, the porous structure includes a plurality of portions along the longitudinal direction of the heat pipe, and the pore sizes of the two adjacent portions are different. Thereby, the pore size is distributed along the longitudinal direction of the heat pipe. The manufacturing method of the heat pipe porous structure Rolling a sheet-like wire mesh 7 1260389 having mesh apertures of different sizes into a cylindrical wire mesh such that the pore size of the wire mesh is distributed in a radial or longitudinal direction, and then the cylindrical wire mesh is placed in the heat pipe. In accordance with an embodiment of the present invention, the cylindrical mesh is coaxially arranged in a radial direction, and two adjacent cylindrical meshes have different pore sizes such that the porous structure forms a pore size in a radial direction. According to another embodiment of the present invention, the cylindrical mesh is coaxially arranged in a longitudinal direction, and two adjacent cylindrical meshes have different pore sizes such that the porous structure forms a pore size along the longitudinal direction. The pores of the gradient distribution. The porous structure of the above-mentioned heat pipe has the advantages of the pore size of the pores in the radial direction or the longitudinal direction, so that it can have the advantages of large and small pores at the same time, and at the same time achieve higher capillary force and lower reflux resistance, thereby improving the performance of the heat pipe. [Embodiment] Hereinafter, the present invention will be further described with reference to the accompanying drawings. As shown in the first figure, the heat pipe 10 includes a pipe body 20, a porous structure 30 in close contact with the inner wall surface of the pipe body 20, and a working liquid filled in the pipe body 20. The tubular body 20 is made of a metal material having good thermal conductivity, such as copper, etc., and the cross section of the tubular body 2 is circular. It is understood that the cross section of the official body 2Q can also be other shapes, such as a square, a side 幵/ 'Side shape, etc., the working liquid filled in the body 2 is generally a liquid with low Buddha points, such as water, alcohol, and the like. The evening hole and the structure 3 are composed of a wire mesh having substantially equal thickness and close contact with each other, and the inner layer wire mesh 4Q, the middle layer wire mesh 5g, and the outer layer wire mesh 6〇 are respectively arranged along the radial direction of the heat pipe, wherein 8 1260389 outer layer wire The mesh 6G is in close contact with the inner wall surface of the tubular body 2G. Each layer of wire mesh is woven by copper, stainless steel, iron wire or other metal wires, and fine and dense pores are formed between the wires to form a porous structure to provide capillary force. In practical applications, according to the wire mesh material and the working liquid. The compatibility determines to ensure that no chemical reaction takes place between the screen and the body. The layers of the above-mentioned layers have pores with different pore diameters. In the present embodiment, the inner layer of the screen 40 has the largest pores, the middle layer of the screen 5 is the second, and the outer layer of the screen 6 has the smallest pores, so that the porous structure 30 is along the radial direction of the heat pipe 10. A gradient distribution of pores is formed. When the heat pipe is working, the gradient of the pores of the porous structure 30 is used to adjust the properties of the heat pipe to achieve the effect of high capillary pressure difference and low flow resistance, and the performance of the heat pipe 10 is improved. The porous structure 30 is not limited to the above embodiment. As shown in the second figure, the porous structure 230 of the heat pipe 21 includes an inner layer mesh 24, a middle layer 250, and an outer layer which are layered outward along the radial direction of the heat pipe 210. The mesh 260, wherein the outer layer screen 260 has the largest pores, the middle layer screen 250 is the second, and the inner layer screen 24 has the smallest pores, so that the porous structure 23 has a gradient distribution of pores along the radial direction of the heat pipe 1〇. In addition, it is also possible to set the inner and outer layers of the mesh to have the same size, while the middle layer and the inner and outer layers have different pore sizes. In the application of the shell, the number of layers of the screen and the size distribution of the pores can be set as needed. As long as the porous structure comprises two or more layers of the screen structure, the two adjacent screen layers have different pore distributions in the heat pipe. A pore structure is formed which changes in a gradient along the radial direction of the heat pipe. In addition, the thicknesses of the layers of the porous structure described above are substantially equal, and the porous structure of different thicknesses may be actually measured according to the requirement δ. As shown in the third figure, the thickness of the inner layer screen 340 is the smallest among the porous structure blades of the heat pipe 31〇. The middle layer screen 35 has the largest thickness, and the outer layer screen 36 〇 1260389 has a thickness between the inner layer screen 340 and the outer layer screen 350. The heat pipe porous structure having a radial pore gradient is described above, and a heat pipe porous structure having a longitudinal pore gradient is described below by way of example. As shown in the fourth figure, the heat pipe 41 has an evaporation section, an adiabatic section and a condensation section, and the heat pipe porous structure 430 is provided with a first section 44〇, a second & 450 and a corresponding section respectively corresponding to the evaporation section, the adiabatic section and the evaporation section. The second paragraph is 460. Two adjacent segments of the three segments have different sizes of pores. In the present embodiment, the first segment 440 has the largest pores, the second segment 45 〇 second, and the third segment has the smallest pores, thereby forming gradient pores in the longitudinal direction. There may be other ways of longitudinal gradient. As shown in the fifth figure, the first section 54 has the smallest pore size, the third section 560 has the largest pore size, and the second section 55 has the pore size of the first section 54〇 and the third section 560. between. As shown in the sixth figure, the first segment 64〇 and the third segment (iv) are pore size, while the second segment 650 pore is larger than the other two segments. In the heat pipe porous structure shown in the fourth to sixth figures, the lengths of the three sections in the longitudinal direction of the heat pipe are substantially equal. In practical applications, the length of each segment can be appropriately changed. The seventh figure is a flow chart showing the manufacturing method of the above-mentioned heat pipe porous structure having a gradient pore distribution. The manufacturing method comprises the steps of: providing a desired sheet-like screen, and secondly rolling the sheet-like screen into a tubular shape suitable for the heat pipe body, and then placing the cylindrical wire mesh in the heat pipe body and fixing it. Hereinafter, in conjunction with the eighth to tenth embodiments, the manufacturing method of the heat pipe porous structure will be described in detail by taking the heat pipe porous structure % shown in the first figure as an example. 1260389 0. Referring to the eighth figure, first, three sheet-like screens 30a, 30b, and 30c are provided. Each sheet-like screen has pores of a single-aperture size, and the sheet-like screen 30a has the largest pores, and the screen 30b has the second pores. The screen 30c has the smallest aperture. Referring again to the ninth figure, the three sheet-like screens 3〇a, 3, and 3〇c are sequentially wound onto the outer surface of a tie rod 1 to form a cylindrical shape, and a three-layered layered porous structure is formed, and The screen 30a is located at the innermost layer, the screen 3〇c is located at the outermost layer, and the screen 3〇b is located at the intermediate layer, so that the 结构/成& The tie rod is a hard core rod with a cross-section and a round shape, such as a stainless steel rod. The cylindrical screen 30 adapted to the cross-load surface of the tubular body 2 is provided for the coil, and the cross-sectional shape of the tie rod (10) may be other shapes such as an ellipse, a square, a triangle or the like. Then, referring to the tenth figure, the cylindrical wire mesh and the tie rod 100- are placed into the pipe body 20. After taking the 'side' of the rhyme-shaped screen side-by-side processing. The tubular body 20 which has been placed on the tubular wire mesh is heated to locally melt the cylindrical wire mesh, thereby locally melting the tubular wire mesh and the pipe wall, thereby forming a first- The porous structure is shown. In this process, the tie rod 100 can be taken out before heating, or the pull rod 1〇〇 can be taken out after the heating is completed. It can be understood that, in the embodiment of the above-described introduction method, if the order of the winding of the sheet-like screens 3a, 3〇b, and 30c is adjusted, a porous structure having different gradient pores can be obtained. In the above method, each of the sheet-like screens 3a, 3b and 3〇c is coaxially arranged radially on the outer surface of the cup 100 to form a heat pipe porous structure having a radial gradient pore distribution. Please refer to the tenth-figure sheet for a method of fabricating a heat pipe porous 11 1260389 structure having a longitudinal gradient pore distribution. In the method, three sheets of meshes 3〇a, 3〇b and 耽 with different pores are sequentially wound on the outer surface of the tie rod, but unlike the above method, the three sheets of screens 30A, 30B and 3GC are coaxial. The ground is arranged longitudinally on the outer surface of the tie rod (10) to form a pore having a gradient distribution in the longitudinal direction. Similarly, changing the values of the screen 3QA, fine and summer can result in a porous structure having different gradient pores. In the above, a three-layer or three-segment structure is taken as an example to describe a method for fabricating a porous structure having a gradient pore distribution, and the above method can also be fabricated in a porous structure of more than three or three stages. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only for the purpose of the present invention, and equivalent modifications or variations made by those who are familiar with the present invention in the spirit of the present invention should be covered by the following patents. [Simple description of the diagram] The first to sixth diagrams are schematic diagrams of the cross section of the red heat pipe structure of different implementations along the longitudinal direction of the heat pipe. The seventh figure is a flow chart for manufacturing a porous structure of a heat pipe. The eighth figure is a schematic view of a wire mesh for manufacturing a porous structure of a heat pipe. The ninth figure is a sound diagram of a wire wound on a skill bar. The tenth figure is a schematic view of the wire mesh inserted into the heat pipe body. The tenth-picture is a schematic view of another way in which the screen is wound on the tie rod. [Description of main component symbols] 12 1260389 Pipe 10, 210, 310, 410, 510, 610 pipe wall 20 porous structure 30, 230, 430, 530, 630 inner layer mesh 40, 240, 340 middle layer mesh 50, 250, 350 outer mesh 60, 260, 360 first segment 440, 540, 640 second segment 450, 550, 650 third segment 460, 560, 660 sheet mesh 30a, 30b, 30c drawbar 100 13