TWI321644B - Thermal dissipator employing heat pipe - Google Patents

Description

1321644 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種散熱裝置，尤指一種採用熱管之散熱裝置。 【先前技術】1321644 IX. Description of the Invention: [Technical Field] The present invention relates to a heat dissipating device, and more particularly to a heat dissipating device using a heat pipe. [Prior Art]

隨著電子、網絡通訊產品之發展，產品中的電子元件如晶片等運 算速度愈來愈快，產生的熱量也愈來愈多’而過高之溫度會導致電氣 故障，故必須散除熱量以減少故障率。習知解決辦法所採之方式主要 係應用熱管、散熱片與風扇之組合以力求提高散熱之效能。 如第一圖所示，其為一種習知熱管散熱裝置8，包括散熱鰭片2、 風扇3、熱管4及集熱塊5。熱管4具有蒸發段40、絕熱段42及冷凝 段44。蒸發段40丧入集熱塊5上的槽50内，冷凝段44則穿設於散熱 鰭片2的貫穿孔20内’風扇3安裝於散熱鰭片2的一側。使用時，集 熱塊5與熱源如電子元件等直接接觸，熱管4之蒸發段4〇吸熱後其内 部充填的液態工作介質汽化，汽化的工作介質由蒸發段4〇經絕熱段42 向冷凝段44擴散，冷凝段44將熱量傳遞至與之相連的散熱鰭片2，爾 後由風扇3將熱量吹走’此時處於冷凝段44内之工作介質被冷凝液 化，液化的工作介質藉由附著於熱管4内壁上的毛細結構之毛細力作 用回流至蒸發段40，如此循環往復實現對熱源之散熱β然而，由於熱 β 4之蒸發段4〇係經由集熱塊5與熱源間接相連，因此存在熱源至， 熱塊5的熱阻，降低散熱之效能。 如第二圖所示，針對上述不足，業界提出另一改進之熱管散熱裝 5 1321644 置9。5玄熱官散熱裝置9具有集熱塊6及熱管7。集熱塊6設計成中空 殼體並在其⑽辑熱管7内糊的卫作介f 6Q ^鮮7僅具有絕 熱段72及冷凝段74。集熱塊6上開設-孔以與熱管7的絕熱段72連 通從而該集熱塊6實施熱管7的蒸發段之功能。由於集熱塊6具有 較大的接觸©積’因而其可以個餘科方式直接連接於熱源表面 上，從而消除使用前述集熱塊5所存在的熱阻較大之不足在一定程With the development of electronic and network communication products, the electronic components in the products, such as wafers, are becoming faster and faster, and the heat generated is increasing. 'Excessive temperatures can cause electrical failures, so heat must be dissipated. Reduce the failure rate. The approach taken by conventional solutions is mainly to apply a combination of heat pipes, heat sinks and fans in an effort to improve the efficiency of heat dissipation. As shown in the first figure, it is a conventional heat pipe heat sink 8 comprising a heat sink fin 2, a fan 3, a heat pipe 4 and a heat collecting block 5. The heat pipe 4 has an evaporation section 40, a heat insulating section 42, and a condensation section 44. The evaporating section 40 is immersed in the groove 50 in the heat collecting block 5, and the condensing section 44 is inserted into the through hole 20 of the heat radiating fin 2. The fan 3 is attached to one side of the heat radiating fin 2. In use, the heat collecting block 5 is in direct contact with a heat source such as an electronic component, and the liquid working medium filled inside is evaporated by the evaporation section 4 of the heat pipe 4, and the vaporized working medium is passed from the evaporation section 4 through the adiabatic section 42 to the condensation section. 44 diffusion, the condensation section 44 transfers heat to the heat sink fins 2 connected thereto, and then the heat is blown away by the fan 3 'The working medium in the condensation section 44 is condensed and liquefied, and the liquefied working medium is attached by The capillary force of the capillary structure on the inner wall of the heat pipe 4 is returned to the evaporation section 40, so that the heat dissipation to the heat source is performed cyclically. However, since the evaporation section 4 of the heat β 4 is indirectly connected to the heat source via the heat collecting block 5, there is The heat source to the thermal resistance of the thermal block 5 reduces the heat dissipation performance. As shown in the second figure, in view of the above deficiencies, the industry proposes another improved heat pipe heat dissipating device. The heat dissipation device 9 has a heat collecting block 6 and a heat pipe 7. The heat collecting block 6 is designed as a hollow casing and has a heat insulating section 72 and a condensing section 74 in the (10) heat pipe 7 of the paste. The heat collecting block 6 is provided with a hole for communicating with the heat insulating portion 72 of the heat pipe 7 so that the heat collecting block 6 performs the function of the evaporation portion of the heat pipe 7. Since the heat collecting block 6 has a large contact product, it can be directly connected to the surface of the heat source in a non-discipline manner, thereby eliminating the disadvantage that the heat resistance existing in the heat collecting block 5 is large.

度上改善了散熱效果。然而，由於集熱塊6亭熱管7之絕熱段π相連 通時，兩者之間的連接處62存在斷面突變之情況，連接處62位置流 阻變大，工作介質6G之能量損失亦增加。此外，自冷凝段74回流之 工作介質60需要經過熱管7内壁上的毛細結構回流，斷面突變使得回 流的距離較長及時補充至集熱塊6内’易造成集熱塊6干透而 不能正常使用。 【發明内容】The heat dissipation effect is improved. However, since the adiabatic section π of the heat collecting block 6 is connected to each other, the joint 62 between the two has a sudden change in the section, the flow resistance at the joint 62 is increased, and the energy loss of the working medium 6G is also increased. . In addition, the working medium 60 reflowed from the condensation section 74 needs to pass through the capillary structure on the inner wall of the heat pipe 7, and the cross section is abruptly changed so that the recirculation distance is long and replenished into the heat collecting block 6 in a timely manner, which easily causes the heat collecting block 6 to dry out. Normal use. [Summary of the Invention]

有鑑於此，有必要提供一種低流阻的熱管散熱裝置。 -種熱管散熱裝置，包括熱管、散熱^歸具有蒸發段、冷凝 #又及連接②發段與冷凝段之絕熱段，紐段與祕段之間以漸縮形狀 過渡連接’連接處之曲率半徑與絕熱段嶋面寬度之比值大於〇 2小於 等於1 ’»段航件表面無合，其貼合面面積無航件表面 面積基本相等，冷凝段與散熱器相連接β 與習知技術相比，所述熱管散熱裝置由於蒸發段與絕熱段之間以 漸缩形狀财連接，麟熱Η無急速㈣紐麟面，流阻得以降 6 1321644 低’能量損失大幅度減小，從而使工作介質保持相當快的流速。 【實施方式】 請參閱第三圖，其為本發明一實施例之熱管散熱裝置1〇〇。該熱管 散熱裝置100包括熱管1、散熱器2及風扇3。熱管1的一端與發熱電 子元件(圖未示)相連接。散熱器2具有複數鰭片，該複數鰭片中間部位 開設有安裝扎以供熱管1穿設。風扇3安裝於鰭片頂端或側面以增強 熱交換的速度。In view of this, it is necessary to provide a heat pipe heat sink with low flow resistance. - Heat pipe cooling device, including heat pipe, heat dissipation, evaporation section, condensation # and the adiabatic section connecting the 2nd section and the condensation section, and the radius of curvature of the junction between the new section and the secret section The ratio of the width of the surface of the adiabatic section is greater than 〇2 is less than or equal to 1 '». The surface of the voyage has no joint surface, the surface area of the splicing surface is substantially equal, and the condensing section is connected with the radiator. β Compared with the conventional technology. The heat pipe heat dissipating device is connected by a tapered shape between the evaporation section and the adiabatic section, and the heat of the lining is not rapid (four) Newlin surface, the flow resistance is reduced 6 1321644 low 'energy loss is greatly reduced, thereby making the working medium Maintain a fairly fast flow rate. [Embodiment] Please refer to the third figure, which is a heat pipe heat dissipation device 1 according to an embodiment of the present invention. The heat pipe heat sink 100 includes a heat pipe 1, a heat sink 2, and a fan 3. One end of the heat pipe 1 is connected to a heat generating electronic component (not shown). The heat sink 2 has a plurality of fins, and the middle portion of the plurality of fins is provided with a mounting bar for the heat pipe 1 to be worn. The fan 3 is mounted on the top or side of the fin to enhance the speed of heat exchange.

請參閱第四圖，從縱向剖析：熱管1具有蒸發段10、絕熱段12及 冷凝段14三個工作段》蒸發段10呈平板狀或其他與電子元件表面相 適配之形狀，寬度大于絕熱段12的管徑絕熱段12及冷凝段14呈 圓柱狀。蒸發段10與絕熱段12之間以具曲率半徑R的弧線過渡連接， 形成從蒸發段10向絕熱段12之漸缩形狀。請參閱第六、第七圖，其 分別為熱管1中流體能量損失分析圖及該熱管1中的流體能量損失係 數CL與R/d關係曲線圖。該曲線係一指數函數，函數式為Please refer to the fourth figure, from the longitudinal analysis: the heat pipe 1 has three working sections of the evaporation section 10, the adiabatic section 12 and the condensation section 14. The evaporation section 10 has a flat shape or other shape matching the surface of the electronic component, and the width is larger than the heat insulation. The tube diameter adiabatic section 12 and the condensing section 14 of the section 12 have a cylindrical shape. The evaporating section 10 and the adiabatic section 12 are connected by an arc having a radius of curvature R to form a tapered shape from the evaporating section 10 to the adiabatic section 12. Please refer to the sixth and seventh figures, which are respectively the analysis diagram of the fluid energy loss in the heat pipe 1 and the relationship between the fluid energy loss coefficients CL and R/d in the heat pipe 1. The curve is an exponential function and the function is

CL»〇.5xe /d ，當曲率半徑R與管徑d滿足0.2SRMS1時， 與之對應的能量損失係數CL較小且處於區間0<CLS〇.〇〇38内，從而 u p (νι-ν2)2 能量損失hL = CL-—-亦較小。而當R/d<0.2時，能量損失係 數CL則呈指數急劇增大，最大可至0.8，而當R/d>l時，能量損失係 數CL也不會在有明顯的下降。而依據Gibson實驗結論，斷面漸擴或者 漸縮時的能量損失hL為：CL»〇.5xe /d , when the radius of curvature R and the pipe diameter d satisfy 0.2SRMS1, the corresponding energy loss coefficient CL is small and is within the interval 0 <lt; CLS 〇. 〇〇 38, thus up (νι-ν2 ) 2 Energy loss hL = CL--- is also small. When R/d < 0.2, the energy loss coefficient CL increases exponentially, up to 0.8, and when R/d > l, the energy loss coefficient CL does not decrease significantly. According to the Gibson experiment, the energy loss hL when the section is diverging or contracting is:

CL (W 2g (1) 其中’ 0<ClS0.0038 ’ V[、V2為流體在斷面Si、Si與s2連接處 以及S2處的流速。 與此相對地，請參閱第五圖，習知熱管散熱裝置之熱管斷面突變 而造成的流體能量損失可由下述方程式推導出來： 一、 連續方程式：CM^AfVeAfVzAz.............................(2) 其中，Q為流量，、Ve、％為流體在斷面Si、&與&連接處以 及S2處的流速’ Αι、八2為管道Si、S2處的命面面積》 二、 動量方程式：（Pe-P2)A2=pQ(V2-Ve)............................⑶ 其中，Pi、Pe、P2為流體在斷面S:、\與S2連接處以及S2處的壓 力，p為流體密度，設Ve«Vi、Pe*Pj、i!⑶可改成為： Ύ PQ PgA2 (V2-V〇 = _Q gA2 (V2-V〇 (4) 其中，7* =pg r為比重。 三、能量方程式：Y + + + k............(5) 即 hL=yZl + (Zl-Z2) + ^L^........................................(6) 其中，為高度，hL為於管路中流體之能量損失，因Zl=Z2將 (4)代入(6)可得斷面突變所造成的流體能量損失hL為： .⑺ 比較⑴與⑺，因〇<CLS〇〇〇38可知斷面漸擴或者漸縮時的能量 損失遠小於斷面突變所造成的流體能量損失。此外，對壓降而言，流 1321644 體阻抗愈大(能量損失愈多）’壓降就愈大。由壓降公式ΔΡ = CL x |pV2 來看，當損失係數愈大時壓降也就愈大了，因此只要〇<ClSO.O〇38 即可確保流體流經此處，具有較小的壓降，也就是僅有少量的能量損 失。CL (W 2g (1) where ' 0< ClS0.0038 ' V [, V2 is the flow velocity of the fluid at the junction of Si, Si and s2 and at S2. In contrast, please refer to the fifth figure, The fluid energy loss caused by the sudden change of the heat pipe section of the heat pipe heat sink can be derived from the following equation: 1. Continuous equation: CM^AfVeAfVzAz..................... . . . (2) where Q is the flow rate, and Ve and % are the flow rates of the fluid at the section Si, && and the junction and the flow rate at S2 ' Αι, 八 2 is the pipe Si, S2 The area of the face" Second, the momentum equation: (Pe-P2) A2 = pQ (V2-Ve).......................... ..(3) where Pi, Pe, and P2 are the pressures of the fluid at the junction S:, \ and S2 and S2, and p is the fluid density. Let Ve«Vi, Pe*Pj, i!(3) be changed to : Ύ PQ PgA2 (V2-V〇= _Q gA2 (V2-V〇(4) where 7* =pg r is the specific gravity. III. Energy equation: Y + + + k.......... ..(5) ie hL=yZl + (Zl-Z2) + ^L^............................... .........(6) where, for height, hL is the energy loss of the fluid in the pipeline, because Zl=Z2 substituting (4) into (6) The fluid energy loss hL caused by the change is: (7) Comparing (1) and (7), because 〇 <CLS〇〇〇38, the energy loss when the section is diverging or tapered is much smaller than the fluid energy loss caused by the section mutation. In addition, for the pressure drop, the larger the body impedance of the flow 1321644 (the more energy loss), the larger the pressure drop. From the pressure drop formula ΔΡ = CL x |pV2, the pressure drop is greater when the loss coefficient is larger. The larger, so 〇<ClSO.O〇38 ensures that fluid flows through it with a small pressure drop, that is, only a small amount of energy loss.

而從徑向剖析：熱管1具有由金屬一體成型之管殼16，於該管殼 16内壁上設有毛細結構18，如絲網結構、溝槽結構、金屬粉末燒結結 構等以提供毛細作用力。管殼16内還填充肴工作介質19如水、丙酮 等流體。工作介質19在毛細結構is的毛細力作用下從冷凝段14經絕 熱段12向条發段1〇回流時，由於曲率半徑r與管徑d滿足〇 2^ ’足夠大的曲率使得工作介質19需要流過的路徑較斷面突變時的 情況變短，因而熱管1的效能相對較高。From the radial analysis: the heat pipe 1 has a shell 16 integrally formed of metal, and a capillary structure 18 is disposed on the inner wall of the shell 16, such as a wire mesh structure, a groove structure, a metal powder sintered structure, etc. to provide capillary force. . The casing 16 is also filled with a working medium 19 such as water, acetone or the like. When the working medium 19 is recirculated from the condensing section 14 through the adiabatic section 12 to the strip section 1 under the capillary force of the capillary structure is, the working medium 19 is satisfied because the radius of curvature r and the tube diameter d satisfy a sufficiently large curvature of 〇2^'. The path that needs to flow is shorter than when the section is abrupt, and the efficiency of the heat pipe 1 is relatively high.

當熱官散熱裝置100裝設在發熱電子元件上時，平板狀的蒸發段 10的底面102利用導熱膠或者扣具等方式直接貼設於電子元件表面， 電子疋件產生的熱量傳遞至熱管1的蒸發段1〇 ’使該處的液態工作介 質19受熱蒸發，蒸發的氣體通過絕熱段12流動至冷凝段14，並將熱 量傳遞至散熱7C件2,散熱元件2的複數_片將㈣帶來的熱量散發到 i氣中去，使之放熱後冷凝為液體，在毛細結構18的毛細力作用下回 流至平板㈣蒸發段1G ’如此往賴環餅電子腾能在蚊溫度下 正常運行》由於蒸發段10與絕熱段12之間以漸縮形狀過渡連接(連接 處曲率半徑R與管徑d純QMR/dSl)，使得熱管i中無急速枚縮 或擴張斷©’流阻得崎低，能量損失大幅度減小，從錢工作介質 9 1321644 19保持相當快的流速。此外’當工作介質19由冷凝段14(斷面積小) 會流至蒸發段1〇(斷面積大)時，其可以順利補充至蒸發段1〇，防止由 於工作介質19無法及時補充至蒸發段10而發生熱管1干透之不利狀 況。When the heat dissipation device 100 is mounted on the heat-generating electronic component, the bottom surface 102 of the flat-shaped evaporation section 10 is directly attached to the surface of the electronic component by means of a thermal adhesive or a fastener, and the heat generated by the electronic component is transmitted to the heat pipe 1 The evaporation section 1〇' causes the liquid working medium 19 at that place to be evaporated by heat, the evaporated gas flows through the adiabatic section 12 to the condensation section 14, and the heat is transferred to the heat-dissipating 7C piece 2, and the plurality of heat-dissipating elements 2 will be (4) The heat from the heat is dissipated into the gas, and it is condensed into a liquid after exothermic heat. It is returned to the flat plate (4) in the evaporation section under the capillary force of the capillary structure 18 (so that the electrons of the lyophilized cake can operate normally under the mosquito temperature) Since the evaporating section 10 and the adiabatic section 12 are connected in a tapered shape (the radius of curvature R of the joint and the diameter of the pipe d pure QMR/dSl), there is no rapid contraction or expansion in the heat pipe i. The energy loss is greatly reduced, maintaining a fairly fast flow rate from the money working medium 9 1321644 19. In addition, when the working medium 19 flows from the condensing section 14 (small area) to the evaporation section 1 〇 (large sectional area), it can be smoothly replenished to the evaporation section 1 〇 to prevent the working medium 19 from being replenished to the evaporation section in time. 10, the adverse condition of the heat pipe 1 drying out occurs.

本實施例中熱管1所使用之管殼16與其内充填的工作介質18可 為慣常應用之銅一水組合或者銘一丙酮組合，亦可為其他材料之組 合。此外，本實施例中熱管1之冷凝段14亦可製成平板狀，利用導熱 膠貼設於散熱器2之底端從而可增大與散熱器2的接觸面積，加快冷 凝速度》蒸發段10與冷凝段14僅要求具有與發熱電子元件較大之接 觸表面即可，而不限定於方形、圓形或者其他形狀。、絕熱段12可為圓 管，也可為棱柱形狀的方管。散熱器2、風扇3之結構並不限於本實施 例所揭示之結構’其亦可為其鱗界f知之散綠結構，在滿足散熱 需求之情況下亦可省略風扇3之使用。In the present embodiment, the tube 16 used in the heat pipe 1 and the working medium 18 filled therein may be a conventional copper-water combination or a combination of Ming-Acetone, or a combination of other materials. In addition, the condensation section 14 of the heat pipe 1 in the embodiment can also be formed into a flat shape, and is attached to the bottom end of the heat sink 2 by using a thermal conductive adhesive to increase the contact area with the heat sink 2, and accelerate the condensation speed. It is only required to have a larger contact surface with the heat-generating electronic component than the condensation section 14, and is not limited to a square, a circle or the like. The adiabatic section 12 can be a circular tube or a prismatic square tube. The structure of the heat sink 2 and the fan 3 is not limited to the structure disclosed in the embodiment. It can also be a green structure of the scale, and the use of the fan 3 can be omitted if the heat dissipation requirement is satisfied.

综上所述，本發明符合發明專利要件，表依法提出專利申請。惟， 以上所述者僅為本發明之_實_，舉凡熟悉本發明技藝之人士， 在援依本㈣_所狀料修賊變化，皆應包含㈣下之幸請專 利範圍内》 【圖式簡單說明】 第-圖係-習知熱管散熱裝置之結構禾意圖。 第二圖係另一習知熱管散熱裝置之結構示意圖》 第三圖係本發明熱管散_置之結構禾意圖。 第四圖係第三圖之鮮卫作原理圖。 10 1321644 第五圖係習知熱管斷面突變設計之流體能量損失分析圖。 第六圖係第三圖之熱管流體能量損失分析圖。 第七圖係第三圖之熱管中的流體能量損失係數曲線圖。In summary, the present invention complies with the requirements of the invention patent, and the patent application is filed according to law. However, the above is only the _ _ _ of the present invention, and those who are familiar with the art of the present invention, in the case of the aid of this (four) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Brief description of the formula] - Figure - the structure of the heat pipe heat sink is intended. The second figure is a schematic structural view of another conventional heat pipe heat dissipating device. The third figure is the structure of the heat pipe of the present invention. The fourth picture is the schematic diagram of the fresh figure in the third picture. 10 1321644 The fifth figure is a fluid energy loss analysis diagram of a conventional heat pipe section design. The sixth figure is a heat loss analysis diagram of the heat pipe fluid in the third figure. The seventh figure is a graph of the fluid energy loss coefficient in the heat pipe of the third figure.

【主要元件符號說明】 熱管 1 蒸發段 10 絕熱段 12 冷凝段 14 管殼 16 毛細結構 18 工作介質 19 熱管散熱裝置 100 底面 102 散熱器 2 風扇 3[Main component symbol description] Heat pipe 1 Evaporation section 10 Insulation section 12 Condensation section 14 Shell 16 Capillary structure 18 Working medium 19 Heat pipe heat sink 100 Bottom surface 102 Radiator 2 Fan 3

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Claims (1)

1321644 十、申請專利範圍： 1. -種熱官散熱裝置’包括—熱管、—散熱器，該熱管具有蒸發段、冷凝 段及連接蒸發段與冷凝段之絕熱段，該蒸發段與發熱元件表面相貼 合，其貼合面面積與發熱元件表面面積基本相等，冷凝段與散熱器相 連接，其改良在於：該蒸發段與絕熱段之間以漸縮形狀過渡連接該 連接處之曲率半徑與絕熱段斷面寬度之比值大於〇·2小於等於工。 2. 如申請糊範圍幻項所述之熱管散熱裝置，其巾該蒸發段呈扁平形狀。 3·如申請專利範圍第2項所述之熱管散熱裝置，其中該絕熱段為圓管。 4.如申請專利範圍第2項所述之熱管散熱裝置，其中該絕熱段為棱柱狀方 管。 5·如申請專利範圍第1項所述之熱管散熱裝Ϊ，其巾料凝段呈扁平形狀。 6. 如申請專利範圍第5項所述之熱管散熱裝置’其中該冷凝段與絕熱段連 接處之曲率半徑與絕熱段斷面寬度之比值大於0.2小於等於1。1321644 X. Patent application scope: 1. - A heat-dissipating heat-dissipating device' includes a heat pipe and a radiator, the heat pipe having an evaporation section, a condensation section and an adiabatic section connecting the evaporation section and the condensation section, the evaporation section and the surface of the heating element The surface area of the bonding surface is substantially equal to the surface area of the heat generating component, and the condensation section is connected to the heat sink. The improvement is that the radius of curvature of the joint is gradually connected between the evaporation section and the heat insulating section. The ratio of the section width of the adiabatic section is greater than 〇·2 less than or equal to the work. 2. If the heat pipe heat sink described in the application of the paste range is used, the evaporation section of the towel has a flat shape. 3. The heat pipe heat dissipating device according to claim 2, wherein the heat insulating section is a round pipe. 4. The heat pipe heat sink of claim 2, wherein the heat insulating section is a prismatic square tube. 5. The heat pipe heat dissipating device according to claim 1 of the patent application, wherein the condensing section of the towel material has a flat shape. 6. The heat pipe heat dissipating device of claim 5, wherein a ratio of a radius of curvature of the junction between the condensation section and the adiabatic section and a section width of the adiabatic section is greater than 0.2 and less than or equal to one. 7. 如申請專利範圍第1項所述之熱管散熱裝置，其中該熱管散熱裝置還具 有一風扇，該風扇安裝於散熱器一侧。 8. 如申請專利範圍第1項所述之熱管散熱裝置，其中該熱管具有一管殼， 組成該管殼之蒸發段、冷凝段及絕熱段係一趙成型的。 9·如申請專利範圍第8項所述之熱管散熱裝置，其中該管殼材質為銅。 10.如申請專利範圍第9項所述之熱管散熱裝置，其中該管殼内壁面上形成 有毛細結構。 127. The heat pipe heat sink of claim 1, wherein the heat pipe heat sink further has a fan mounted on one side of the heat sink. 8. The heat pipe heat dissipating device according to claim 1, wherein the heat pipe has a tube shell, and the evaporation portion, the condensation portion and the heat insulating portion of the tube shell are formed by one. 9. The heat pipe heat dissipating device according to claim 8, wherein the tube material is copper. 10. The heat pipe heat sink according to claim 9, wherein a capillary structure is formed on an inner wall surface of the envelope. 12