200916714 ..九、發明說明： ‘ 【發明所屬之技術領域】 本發明涉及一種熱管，尤指一種應用於電子元件散熱 之熱管。 【先前技術】 目前，熱管應用於散熱領域。熱管藉此全封閉在真空 管内之工作流體之汽、液相變來傳遞熱量，具有極高之導 熱性。先前之熱管包括中空之管體、毛細結構、密封於管 體内之工作流體。熱管工作時，管體内部填充之低沸點工 作流體在熱管之蒸發段吸收發熱元件產生之熱量後蒸發汽 化，蒸汽在微小之壓差下運動至冷凝段，並在冷凝段釋放 熱量而液化，該液化後之工作流體在熱管壁部之毛細結構 之作用下再回流至蒸發段，藉此該工作流體之循環運動， 將發熱元件產生之熱量散發出去。 筆記型電腦之内部空間越來越狹小，故中央處理器之 散熱模組之厚度也要求越來越薄。先前之毛細結構採用溝 槽形式或者粉末燒結形式，其毛細結構之厚度通常在 0.3〜0.8毫米之間。當熱管之厚度只有2.0毫米或更小時， 熱管之蒸汽通道極小而喪失散熱之功能。絲網式毛細結構 雜铁亘右ΓΜ〜0 7亭来厘疫夕主.細结構，缺絲網溆答璧夕结 合不緊密，在熱管折彎或打扁變形時，由於絲網與管壁結 合不緊而脫落，導致熱傳量降低且熱阻急劇增加。故在厚 度進一步變薄之情況下，熱管不能達到正常之傳熱性能， 6 200916714 無法滿足筆記型電腦之結構限制和性能要求。 【發明内容】 鑒於此，有必要提供一種厚度較薄且散熱性能好之熱 管。 一種熱管，包括中空之管體、設於該管體内之毛細結 構、密封於該管體内之工作流體，該管體包括蒸發段和冷 凝段，毛細結構包括輔助毛細結構和至少一脈管，該輔助 毛細結構環設於該蒸發段之内壁上，該脈管呈階梯狀，包 括大端和小端，從該蒸發段延伸至該冷凝段，該小端於蒸 發段内與該輔助毛細結構接觸，該大端至少部分與該冷凝 段之内壁接觸。 一種熱管，包括中空之管體、設於該管體内之毛細結 構、密封於該管體内之工作流體，管體包括蒸發段和冷凝 段，毛細結構包括輔助毛細結構和至少一中空之脈管，輔 助毛細結構至少設置於蒸發段之内壁上，脈管從蒸發段延 伸至冷凝段，脈管包括大端和小端，小端與位於蒸發段之 輔助毛細結構接觸，大端至少部分與該冷凝段之内壁接觸。 與先前技術相比，脈管有效吸附工作流體，避免工作 流體因重力因素形成局部積聚，防止熱阻增加，並且脈管 之孔徑較小，尤其在熱管壓扁成形後仍然保持原有之毛細 作用力，保證工作流體之循環流動，滿足超薄筆記型電腦 之散熱要求，又輔助毛細結構之設置相對地增大蒸發段之 毛細作用力，便於冷卻後之液體回流。 200916714 【實施方式】 下面參照圖示，進一步說明該熱管之結構。請一併參 閱圖1至圖3，該熱管包括管體1〇、毛細結構和密封於管 體10内之工作流體（圖未示）。 該管體10係中空之密封腔體，由銅等導熱性能良好之 材料製成’將發熱元件產生之熱量傳遞到管體1〇内部，包 括蒸發段101、絕熱段103和冷凝段102，蒸發段101和冷 凝段102分別位於管體1〇之兩端，絕熱段位於蒸發段 101和冷凝段102之間。該實施例中，管體1〇呈扁平狀， 其徑向橫截面大致呈矩形，四角均形成圓形倒角，管體1〇 之厚度遠小於其寬度。實際上，管體1〇既可以係直型管， 也可以係其他任何彎折型管，例如“U”型或者“l”型。 如果熱管係“U”型，可以將其一平行端部作為蒸發段 101，另一平行端部作為冷凝段1〇2，也可以將其位於兩平 行端部之間之彎折中間段作為蒸發段101，而兩平行端部則 分別作為冷凝段102。 工作流體填充於管體1〇内，可以係水、酒精、甲醇等 具有較低沸點之物質。工作流體在管體1〇之蒸發段1〇1處 吸熱洛發成蒸汽’蒸汽在微小之壓差下運動至冷凝段皿， 並在冷凝段102釋放熱量而液化，液化後之工作流體藉此 毛細結構之毛細_力喊至蒸發段1()1，藉此該工作流體 之循環運動’將發熱元件產生之熱量散發出去。 熱管之毛細結構包括三脈管12及—環設於熱管之蒸發 段101 _之獅毛細結構13，該輔助毛細結構13可以 8 200916714 係絲網式毛細結構，也可以係碳納米管層，其厚度約為〇 1 宅米。絲網式毛細結構藉此金屬網絲或者纖維束編織形 成。奴納米管層含有單壁碳納米管、多壁碳納米管或者其 組合，厚度為1〇〇納米一100微米。採用絲網式毛細結構或 者石厌納米管層作為輔助毛細結構13 .，不僅厚度薄、體積小， 而且導熱能力強、毛細性能好，使得熱管之蒸發段1〇1負 何較大之徑向能量密度，降低熱管之蒸發段101之熱阻 值’也有利於工作流體快速回流。 該脈管12沿熱管之寬度方向均勻間隔設置，如果脈管 12之數量較多，也可以使各脈管12之間相互貼合。各脈管 12均呈階梯狀，位於管體1〇内，從蒸發段1〇1延伸至冷凝 段102。請一併參閱圖4、圖5，脈管12係由複數銅絲、鋁 線、不錄鋼絲或者纖維束等材料製成之絲線編織後形成之 可繞性之官體，内部形成一中心通道，管壁上形成有複數 細小之孔隙，該孔隙與中心管道相互連通。每一脈管12均 包括一大端121和一小端122,大端ι21和小端ι22之中心 軸線在同一直線上。其中小端122貼設於熱管之蒸發段1〇1 之輔助毛細結構13之内壁，大端121則與熱管之冷凝段 102、絕熱段103之内壁面相接觸。小端之外徑與辅助 毛細結構13之内彳空相當，大端121之外徑與熱管之管體 10之内徑相當’從而脈管12之上下兩侧與熱管冷凝段 102、絕熱段103之管壁以及輔毛細結構13之管壁形成線 接觸，而脈管12之間則形成蒸汽通道。該脈管12之管徑 可從0.5毫米擴展到數毫米，其最大值取決於工作流體之性 200916714 質，從而對工作流體輸送之方向具有單一性，即僅供在冷 凝段102放熱凝結後之工作流體通過而回流到蒸發段 101’而在蒸發段101吸熱蒸發汽化之蒸汽則僅能從脈管12 與官體10之間之蒸汽通道擴散到冷凝段1〇2。以純水為 例’脈管12之管徑較佳範圍係0.5毫米至2毫米之間。脈 管12還可以採用其他相似結構形式，該實施例中脈管12 之松截面形狀係圓環形，而脈管12也可與熱管之形狀相適 應’例如脈管12之橫截面形狀係橢圓環形，從而脈管12 與辅助毛細結構13及熱管冷凝段1〇2、絕熱段1〇3之内壁 面只現面接觸’增加接觸面積。而脈管12之數量可根據熱 管之寬度而調整，不限於三個。 如圖6、圖7、圖8所示為本發明熱管另一實施例，與 前述實施例不同之處在於：該輔助毛細結構21之下半環延 伸至冷凝段102 ’即在蒸發段ι〇1處’輔助毛細結構21貼 設於蒸發段101之内壁面上，而在絕熱段103、冷凝段102, 輔助毛細結構只貼設於冷凝段、絕熱段1〇3之内壁面 之下半部分’又可以使設置於蒸發段1〇1之輔助毛細結構 21之有效毛細孔徑小於設置於冷凝段1〇2之輔助毛細結構 21之有效毛細孔徑，如是使得冷凝段ι〇2流阻小、便於冷 凝液體回流，蒸發段101毛細作用力大、吸熱面積大，從 而可以提高熱傳效果。絕熱段1〇3之辅助毛細結構21之有 效毛細孔徑既可以與蒸發段1〇1或泠凝段1〇2之有效毛細 孔位相同，或者介於蒸發段與冷凝段1〇2之有效毛細 孔徑大小之間，如是從冷凝段1〇2、絕熱段1〇3到蒸發段 200916714 101所設輔助毛細結構21之孔徑依次減少、，受到之毛細作 用力逐漸增大，使其回流更順暢。而脈管2G之形狀也與輔 助毛細結構21相適應，上半部分呈階梯狀，包括大端201 和小端2〇2，大端201和小端2〇2之中心轴線相互平行，不 在一條直線上，然在同一垂直恭 伙 土且戳面上。大端201之上半部 铃熱管之管體10之内壁面堍技 土®3琛接觸，大端201之下半部與輔 助毛細結構21之内壁面後接讎 細社…曲綠接觸，小端202之外徑與輔助毛 細結構21之内徑相同，怂 叱而小鸲2〇2與輔助毛細結構21 之内壁面線接觸。由於線 m , 瓦接觸之地方可能會發生彈性形 艾，那麼所有線接觸之虛加 範圍之内。 处都可以係面接觸，這都在本發明 系示上前述，本發明' 入 專利申請。惟以上前^ 4明專利之要件，爰依法提出 熟悉本案技藝之人士，僅為本發明之較佳實施例，舉凡 或變化，皆應涵蓋於以在爰依本發明精神所作之等效修飾 下之·申清專利範圍内。 【圖式簡單說明】 圖1為本發明敎管〜 圖2為圖i沿'π' — 订〜較佳實施例之軸向剖面示意圖。 m q ^ , 之剖面示意圖。 圖3為圖1沿瓜-jjj F1 /1丸π — 又剖面示意圖。 圖4為脈官之主視圖。 之主視圖 圖5為圖4中沿ν〜γ 圖6為本料熱營 丨。 < 又一較佳實施例之軸向剖面示意 圖7為圖6中沿邓、加 卿之剖面示意圖。 11 200916714 圖8為圖6中沿Vffl-M之剖面示意圖。 【主要元件符號說明】 管體 10 蒸發段 101 冷凝段 102 絕熱段 103 脈管 12 > 20 大端 121 、 201 小端 122、202 輔助毛細結構 13、21 12200916714 .. IX. Description of the invention: ‘Technical field to which the invention pertains. The present invention relates to a heat pipe, and more particularly to a heat pipe for heat dissipation of electronic components. [Prior Art] At present, heat pipes are used in the field of heat dissipation. The heat pipe transfers the heat by the vapor and liquid phases of the working fluid which are completely enclosed in the vacuum tube, and has extremely high heat conductivity. Previous heat pipes included hollow tubes, capillary structures, and working fluids sealed within the tubes. When the heat pipe is working, the low boiling working fluid filled inside the pipe body evaporates and vaporizes after the heat generated by the heat generating component is absorbed in the evaporation section of the heat pipe, and the steam moves to the condensation section under a slight pressure difference, and releases heat in the condensation section to be liquefied. The liquefied working fluid is returned to the evaporation section under the action of the capillary structure of the heat pipe wall portion, whereby the circulating motion of the working fluid dissipates the heat generated by the heat generating component. The internal space of the notebook computer is getting smaller and smaller, so the thickness of the thermal module of the central processing unit is also required to be thinner and thinner. The previous capillary structure is in the form of a groove or a powder sintered form, and the thickness of the capillary structure is usually between 0.3 and 0.8 mm. When the thickness of the heat pipe is only 2.0 mm or less, the steam passage of the heat pipe is extremely small and loses the function of heat dissipation. Wire mesh type capillary structure, right iron 亘 right ΓΜ ~ 0 7 pavilion to diarrhea eve main. Fine structure, lack of mesh 溆 璧 璧 璧 结合 结合 结合 结合 结合 结合 结合 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热The combination is not tight and falls off, resulting in a decrease in heat transfer amount and a sharp increase in thermal resistance. Therefore, in the case where the thickness is further thinned, the heat pipe cannot achieve normal heat transfer performance, and 6 200916714 cannot meet the structural limitations and performance requirements of the notebook computer. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a heat pipe having a thin thickness and good heat dissipation performance. A heat pipe includes a hollow pipe body, a capillary structure disposed in the pipe body, a working fluid sealed in the pipe body, the pipe body including an evaporation section and a condensation section, and the capillary structure includes an auxiliary capillary structure and at least one vessel The auxiliary capillary structure ring is disposed on an inner wall of the evaporation section, the vessel is stepped, and includes a large end and a small end, and extends from the evaporation section to the condensation section, the small end is in the evaporation section and the auxiliary capillary In contact with the structure, the large end is at least partially in contact with the inner wall of the condensation section. A heat pipe includes a hollow pipe body, a capillary structure disposed in the pipe body, and a working fluid sealed in the pipe body, the pipe body includes an evaporation section and a condensation section, and the capillary structure includes an auxiliary capillary structure and at least one hollow vein The tube, the auxiliary capillary structure is disposed at least on the inner wall of the evaporation section, and the vessel extends from the evaporation section to the condensation section, the vessel comprises a large end and a small end, the small end is in contact with the auxiliary capillary structure located in the evaporation section, and the large end is at least partially The inner wall of the condensation section is in contact. Compared with the prior art, the vessel effectively adsorbs the working fluid, avoids the local accumulation of the working fluid due to gravity factors, prevents the thermal resistance from increasing, and the pore diameter of the vessel is small, especially after the heat pipe is flattened and remains the original capillary action. The force ensures the circulating flow of the working fluid, satisfies the heat dissipation requirements of the ultra-thin notebook computer, and assists the setting of the capillary structure to relatively increase the capillary force of the evaporation section, and facilitates the liquid return after cooling. 200916714 [Embodiment] The structure of the heat pipe will be further described below with reference to the drawings. Referring to Figures 1 through 3 together, the heat pipe includes a tubular body, a capillary structure, and a working fluid (not shown) sealed in the tubular body 10. The pipe body 10 is a hollow sealing cavity made of a material having good thermal conductivity such as copper. The heat generated by the heating element is transferred to the inside of the pipe body 1, including the evaporation section 101, the adiabatic section 103 and the condensation section 102, and is evaporated. The section 101 and the condensation section 102 are respectively located at both ends of the tube body 1 , and the adiabatic section is located between the evaporation section 101 and the condensation section 102. In this embodiment, the tubular body 1 is flat, its radial cross section is substantially rectangular, and the four corners form a circular chamfer, and the thickness of the tubular body 1 is much smaller than its width. In fact, the tubular body 1 can be either a straight tube or any other bent tube, such as a "U" or "l" type. If the heat pipe is of the "U" type, one parallel end can be used as the evaporation section 101, and the other parallel end can be used as the condensation section 1〇2, or it can be used as the evaporation intermediate section between the two parallel ends. Segment 101, and the two parallel ends serve as condensation sections 102, respectively. The working fluid is filled in the tube body 1 and can be a substance having a lower boiling point such as water, alcohol or methanol. The working fluid absorbs heat into the steam at the evaporation section 1〇1 of the pipe body 1'. The steam moves to the condensation section under a slight pressure difference, and releases heat in the condensation section 102 to be liquefied, thereby liquefying the working fluid The capillary of the capillary structure _ shouts to the evaporation section 1 () 1, whereby the circulating motion of the working fluid 'dissipates the heat generated by the heating element. The capillary structure of the heat pipe comprises a three-tube 12 and a lion capillary structure 13 disposed on the evaporation section 101 of the heat pipe, and the auxiliary capillary structure 13 may be a mesh-type capillary structure of the 200916714 or a carbon nanotube layer. The thickness is about 〇1 house rice. The wire mesh capillary structure is formed by weaving a metal mesh or a fiber bundle. The slave nanotube layer contains single-walled carbon nanotubes, multi-walled carbon nanotubes, or a combination thereof, and has a thickness of from 1 nanometer to 100 micrometers. The wire mesh capillary structure or the stone-repellent nanotube layer is used as the auxiliary capillary structure 13 , which is not only thin in thickness, small in volume, but also has strong thermal conductivity and good capillary performance, so that the evaporation section of the heat pipe has a larger radial direction. The energy density, which reduces the thermal resistance of the evaporation section 101 of the heat pipe, also facilitates the rapid return of the working fluid. The vascular tubes 12 are evenly spaced along the width direction of the heat pipe. If the number of the vascular tubes 12 is large, the respective vascular tubes 12 can be attached to each other. Each of the vessels 12 is stepped and located within the tubular body 1 and extends from the evaporation section 1〇1 to the condensation section 102. Referring to FIG. 4 and FIG. 5 together, the vascular tube 12 is a detachable body formed by a plurality of copper wires, aluminum wires, non-recorded wires or fiber bundles, and forms a central passage inside. A plurality of fine pores are formed in the pipe wall, and the pores communicate with the central pipe. Each of the vessels 12 includes a large end 121 and a small end 122, and the central axes of the large end ι 21 and the small end ι 22 are on the same straight line. The small end 122 is attached to the inner wall of the auxiliary capillary structure 13 of the evaporation section 1〇1 of the heat pipe, and the large end 121 is in contact with the inner wall surface of the condensation section 102 and the heat insulation section 103 of the heat pipe. The outer diameter of the small end is equivalent to the hollowing in the auxiliary capillary structure 13, and the outer diameter of the large end 121 is equivalent to the inner diameter of the tube 10 of the heat pipe, so that the upper and lower sides of the vessel 12 and the heat pipe condensation section 102, the adiabatic section 103 The wall of the tube and the wall of the auxiliary capillary structure 13 form a line contact, and a vapor passage is formed between the tubes 12. The diameter of the vessel 12 can be expanded from 0.5 mm to several millimeters, and the maximum value depends on the quality of the working fluid 200916714, so that the direction of the working fluid transport is uniform, that is, only after the heat condensation of the condensation section 102 The working fluid passes through and returns to the evaporation section 101', while the vapor which vaporizes and vaporizes in the evaporation section 101 can only diffuse from the vapor passage between the vessel 12 and the official body 10 to the condensation section 1〇2. Taking pure water as an example, the preferred range of the diameter of the vessel 12 is between 0.5 mm and 2 mm. The vessel 12 can also adopt other similar structural forms. In this embodiment, the loose cross-sectional shape of the vessel 12 is circular, and the vessel 12 can also be adapted to the shape of the heat tube. For example, the cross-sectional shape of the vessel 12 is an elliptical ring. Therefore, the vessel 12 is in contact with the auxiliary capillary structure 13 and the heat pipe condensation section 1 and the inner wall surface of the adiabatic section 1〇3 to increase the contact area. The number of the vascular tubes 12 can be adjusted according to the width of the heat pipe, and is not limited to three. As shown in FIG. 6, FIG. 7, and FIG. 8, another embodiment of the heat pipe of the present invention is different from the foregoing embodiment in that the lower half ring of the auxiliary capillary structure 21 extends to the condensation section 102', that is, in the evaporation section. 1 'the auxiliary capillary structure 21 is attached to the inner wall surface of the evaporation section 101, and in the heat insulation section 103 and the condensation section 102, the auxiliary capillary structure is only attached to the lower half of the inner wall surface of the condensation section and the heat insulation section 1〇3. 'The effective capillary diameter of the auxiliary capillary structure 21 disposed in the evaporation section 1〇1 can be made smaller than the effective capillary diameter of the auxiliary capillary structure 21 disposed in the condensation section 1〇2, so that the flow resistance of the condensation section ι〇2 is small and convenient. The condensed liquid is refluxed, and the evaporation section 101 has a large capillary force and a large heat absorption area, thereby improving the heat transfer effect. The effective capillary pore size of the auxiliary capillary structure 21 of the adiabatic section 1〇3 can be the same as the effective capillary pore position of the evaporation section 1〇1 or the condensing section 1〇2, or the effective capillary between the evaporation section and the condensation section 1〇2. Between the pore sizes, the pore diameter of the auxiliary capillary structure 21 is reduced from the condensation section 1〇2, the adiabatic section 1〇3 to the evaporation section 200916714 101, and the capillary force is gradually increased to make the reflux more smooth. The shape of the vessel 2G is also adapted to the auxiliary capillary structure 21, and the upper half is stepped, including the big end 201 and the small end 2〇2, and the central axes of the big end 201 and the small end 2〇2 are parallel to each other, not On a straight line, in the same vertical, the folks are on the ground and poked. The inner wall of the pipe body 10 of the upper half of the big end 201 is in contact with the technical soil®3琛, and the lower half of the big end 201 is connected to the inner wall of the auxiliary capillary structure 21, followed by a thin green... The outer diameter of the end 202 is the same as the inner diameter of the auxiliary capillary structure 21, and the small 鸲2〇2 is in line contact with the inner wall surface of the auxiliary capillary structure 21. Since the line m and the tile contact may have an elastic shape, then all the line contacts are within the virtual range. Both of them can be in contact with each other, as described above in the context of the present invention, which is incorporated herein by reference. However, the above-mentioned requirements of the patents of the prior art, and those skilled in the art, are only preferred embodiments of the present invention, and the present invention is intended to cover the preferred embodiments of the present invention. Within the scope of the patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a preferred embodiment of the present invention taken along the line of 'π'. m q ^ , a schematic diagram of the section. Figure 3 is a schematic cross-sectional view of Figure 1 along the gua-jjj F1 /1 pill. Figure 4 is a front view of the pulse officer. The main view of Fig. 5 is the thermal enthalpy of Fig. 4 along with ν~γ. <An axial cross-sectional view of still another preferred embodiment Fig. 7 is a schematic cross-sectional view along the line of Deng and Jiaqing in Fig. 6. 11 200916714 Figure 8 is a schematic cross-sectional view along Vffl-M in Figure 6. [Description of main components] Tube 10 Evaporation section 101 Condensation section 102 Adiabatic section 103 Vessel 12 > 20 Big end 121, 201 Small end 122, 202 Auxiliary capillary structure 13, 21 12