200819698 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種熱管及其製造方法，特別係涉及 一種溝槽式熱管及其製造方法。 【先前技術】 對於桌上型電腦（Desktop computer)或筆記型電 腦（Notebook computer)中央處理器（CPU)之熱管散熱 模組(heat pipe thermal modules)，其熱管操作條件一般 在蒸發段(heating section)面積較小，使其蒸發段負荷 之徑向能量密度（radial power density)較冷卻段 (cooling section)高，故，如何提升熱管蒸發段所能負 荷之控向能量密度，使熱管操作更具效率，係為目前 熱管亟待克服之問題。 以溝槽式熱管（grooved heat pipe)而言，溝槽之齒 开v為衫響熱管性能之重要參數，該齒形之變化改變熱 管之性能，如何突破習知製程工藝得到較佳之齒形係 :大關鍵技術《習知溝槽熱管之溝槽齒形從蒸發段至 冷卻段幾乎—致’由於熱管蒸發段之溝槽毛細構造主 =操控著熱官之熱傳機制，故，陸續有相關技術用於 熱官之齒形變化，如溝槽漸進之變化等，以提高 熱管之工作效率。惟，該等技術使得熱管之製程工蔽 困難’量產實施不易’故需提供—種具有簡便之製程 工藝，並具量產性之具有較佳溝槽齒形之熱管。 7 200819698 【發明内容】 有鑒於此，有必要提供一種蒸發段具較高徑向能 量密度之熱管及該熱管之製造方法。 一種熱管，包括管體、設於管體内壁複數微細溝 槽及填充於該管體内之適量工作流體，該管體設有蒸 發段及冷凝段，該蒸發段之管徑小於冷凝段之管徑， 且位於蒸發段之溝槽之槽寬小於位於冷凝段之溝槽之 槽寬。 一種熱管之製造方法，包括如下步驟··提供内壁 設有複數微細溝槽之一管體；利用一縮管模縮小管體 部分區域之管徑以使該部分區域作為管體之蒸發段； 抽真空並填充適量工作流體至管體内；密封該管體， 得到所需之熱管。 該熱管之蒸發段具有較小之管徑及槽寬，使該熱 管相較於一般具均一溝槽尺寸之熱管而言，其蒸發段 可負荷較高之控向能量密度，從而使該熱管具有良好 之傳熱性能’其製造方法使得該熱管藉由簡單之機械 加工方式即可實現上述功效，便於量產實施。 【實施方式】 圖1至圖3所示為本發明熱管1〇之一較佳實施 例，該熱管10包括一管體11、設於管體U内之複數 微細溝槽12、13以及填充於該管體U内之適量可a 凝性工作流體（圖未示）。 7 該管體11為一由銅、鋁等具良好導熱性之材料製 200819698 成之中空金屬管，該金屬管之橫戴面為環形，其厚声 T沿管體11之軸向保持不變。該管體u包括分別位 - 於管體11兩端之蒸發段15與冷凝段14，及位於蒸發 ^ 段15與冷凝段14之間之絕熱段17。該蒸發段15之 管徑小於該冷凝段14之管徑。該絕熱段17在靠近蒗 發段15之一端具有一直徑漸縮之過渡段，該過渡 段16之管徑由絕熱段17向蒸發段15逐漸減小，使該 _ 過渡段16大致呈錐形。 該工作流體為水、酒精、曱醇等具較低沸點之物 質，且通常管體11内被抽成真空，使該工作流體易於 由管體11之蒸發段15處吸熱蒸發，蒸汽帶著熱量向 冷凝段14移動，在冷凝段14放熱後凝結成液體，將 熱量釋放出去，冷凝後之液體經由上述溝槽12、 形成之毛細構造回流至蒸發段15。 該等溝槽12、13沿管體11之内壁軸向直線延伸， • 其中位於蒸發段15之溝槽12與位於冷凝段14之溝槽 工3具有相同之槽深Η，且位於蒸發段15之溝槽12之 齒頂角Al(groove apex angle)大於位於冷凝段14之溝 槽13之齒頂角A2。位於蒸發段15之溝槽12之齒頂 九度Wi及齒根寬度W2分別小於位於冷凝段14之溝 槽13之齒頂寬度Ws及齒根寬度W4，即，位於蒸發 段15之溝槽12之槽寬小於位於冷凝段14之溝槽13 之槽寬。 _ 請參照圖4，該熱管10由以下步驟製得··提供内 9 200819698 壁設有複數微細溝槽之一管體11 ;縮小管體11之部 分區域管徑，以使該部分區域作為管體11之蒸發段 15 ;抽真空及在管體11内填充適量工作流體；密封， 得到所需熱管10。其中，該管體11内壁之溝槽可通 過沿管體11軸向在管體11内壁抽製形成。 請參照圖5及圖6，該管體11之蒸發段15可由 高速旋轉縮管法製得。一用於該高速旋轉縮管法之高 速旋轉縮管模20為一中空之管狀體，該管狀體具有分 別對應於熱管10之過渡段16、冷凝段14及蒸發段15 之漸縮部21、導引部22及細管部23。其中，該導引 部22位於最前端，該漸縮部21由導引部22之尾端向 内減縮形成，該細管部23與漸縮部21之尾端相連。 該導引部22之内徑與冷凝段14之外徑相等；該細管 部23之内徑與該熱管10之蒸發段15所預期得到之外 徑相等；該漸縮部21在縮管之過程中使蒸發段15之 外徑逐漸減小，並在縮管後形成熱管10之過渡段16。 高速旋轉縮管法之縮管過程包括：藉由至少一固 定工具50將管體11固定至一工作台40上；驅動旋轉 縮管模20高速運轉並沿熱管10之轴向由管體11之一 端逐漸向另一端運動至一定長度，在該過程中，旋轉 縮管模20之導引部22導引旋轉縮管模20逐漸向前運 動，同時，旋轉縮管模20之漸縮部21與待縮管部分 之管體11相擠壓，使其管徑逐漸縮小，以得到所需之 熱管10之蒸發段15。 200819698 請參照圖7及圖8，該管體11之蒸發段15可由 旋轉衝擊縮管法製得。一用於該旋轉衝擊縮管法之旋 轉衝擊縮管模30包括至少兩個分模31，該等分模31 各自具有一圓弧形之内表面32,該等圓弧形之内表面 32均勻分佈於一假想圓周33上。每一分模31具有與 熱管10之過渡段16、冷凝段14及蒸發段15分別對 應之漸擴部34、導引部35及細管部36，該漸擴部34 由細管部36之一端向外漸擴形成，而該導引部35則 由漸擴部34之前端延伸形成。 旋轉衝擊縮管法之縮管過程包括··藉由固定工具 50將管體11固定至工作台40上；驅動衝擊縮管模30 之各分模31高速旋轉並逐漸沿管體11徑向向熱管10 之管體11逐漸靠近，以使漸擴部34及細管部36與待 縮管部分之管體11相衝擊，得到所需之熱管10之過 渡段16及蒸發段15。另外，為使製得之蒸發段15之 長度足夠長，在衝擊縮管模30沿管體11之徑向運動 之同時，還可一併驅動衝擊縮管模30沿管體11之軸 向運動。 該熱管10利用旋轉衝擊縮管法或高速旋轉縮管 法等機械加工方式，僅將熱管10蒸發段15之直徑縮 小，即可使獲得之熱管10之蒸發段15之内部溝槽12 之槽寬變窄及齒頂角增大，故，相較於一般具均一溝 槽尺寸之熱管而言，該熱管10之蒸發段15内有較小 之溝槽尺寸，不僅可以提升整體溝槽式熱管10之毛 11 200819698 細輸送能力（capillary f〇rce)及所相對之最大毛細傳熱 限制，同時亦因為蒸發段15之熱傳面積緻密度之提 升’進而提高了熱管1〇之蒸發段15所能負荷之徑向 月b里遂度或徑向傳熱限制，相對之亦降低熱管iq之蒸 發段15之熱阻值。該熱管1〇藉由簡單之機械加工方 式即可實現上述功效，故便於量產實施。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pipe and a method of manufacturing the same, and, in particular, to a grooved heat pipe and a method of manufacturing the same. [Prior Art] For a heat pipe thermal module of a desktop computer or a notebook computer, the heat pipe operating conditions are generally in a heating section (heating section) The area is small, so that the radial power density of the evaporation section load is higher than that of the cooling section. Therefore, how to increase the control energy density of the load of the heat pipe evaporation section, so that the heat pipe operation is more Efficiency is an issue that needs to be overcome in the current heat pipe. In the case of a grooved heat pipe, the tooth opening v of the groove is an important parameter of the performance of the heat pipe. The change of the tooth shape changes the performance of the heat pipe, and how to break through the conventional process to obtain a better tooth profile. :The key technology of the groove is that the groove shape of the grooved heat pipe is almost from the evaporation section to the cooling section. Because the groove capillary structure of the heat pipe evaporation section is the main control mechanism of the heat officer, it is related. The technology is used for the change of the tooth shape of the heat official, such as the progressive change of the groove, etc., in order to improve the working efficiency of the heat pipe. However, these technologies make it difficult to process the heat pipe process. It is not easy to implement mass production. Therefore, it is necessary to provide a heat pipe having a simple groove shape with a simple process technology and mass production. 7 200819698 SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a heat pipe having a higher radial energy density in an evaporation section and a method of manufacturing the heat pipe. A heat pipe comprises a pipe body, a plurality of fine grooves disposed on the inner wall of the pipe body and an appropriate working fluid filled in the pipe body, the pipe body is provided with an evaporation section and a condensation section, and the pipe diameter of the evaporation section is smaller than the pipe of the condensation section The diameter of the groove in the evaporation section is smaller than the groove width of the groove in the condensation section. A method for manufacturing a heat pipe, comprising the steps of: providing a pipe body having a plurality of fine grooves on an inner wall; and reducing a pipe diameter of a portion of the pipe body by using a shrink pipe die to make the portion of the pipe as an evaporation section of the pipe body; Vacuum and fill an appropriate amount of working fluid into the tube; seal the tube to obtain the desired heat tube. The evaporation section of the heat pipe has a smaller pipe diameter and a groove width, so that the heat pipe can load a higher control energy density than a heat pipe having a uniform groove size, so that the heat pipe has Good heat transfer performance' The manufacturing method enables the heat pipe to achieve the above-mentioned effects by simple mechanical processing, which is convenient for mass production. 1 to 3 show a preferred embodiment of a heat pipe 1 of the present invention. The heat pipe 10 includes a pipe body 11, a plurality of fine grooves 12, 13 disposed in the pipe body U, and a filling portion. An appropriate amount of a condensable working fluid in the tube U (not shown). 7 The tube body 11 is a hollow metal tube made of a material having good thermal conductivity such as copper or aluminum, and the transverse surface of the metal tube is annular, and the thick sound T remains unchanged along the axial direction of the tube body 11. . The pipe body u includes an evaporation section 15 and a condensation section 14 which are respectively located at both ends of the pipe body 11, and an adiabatic section 17 which is located between the evaporation section 15 and the condensation section 14. The diameter of the evaporation section 15 is smaller than the diameter of the condensation section 14. The adiabatic section 17 has a tapered transition section near one end of the burst section 15. The diameter of the transition section 16 is gradually reduced from the adiabatic section 17 to the evaporation section 15, so that the transition section 16 is substantially tapered. . The working fluid is a substance having a lower boiling point such as water, alcohol, sterol, etc., and usually the inside of the tube 11 is evacuated, so that the working fluid is easily absorbed by the evaporation portion 15 of the tube body 11 and the steam carries heat. Moving to the condensing section 14, after the condensing section 14 releases heat, it condenses into a liquid, releasing heat, and the condensed liquid is returned to the evaporation section 15 via the above-described groove 12 and the capillary structure formed. The grooves 12, 13 extend linearly along the axial direction of the inner wall of the tubular body 11, wherein the groove 12 located in the evaporation section 15 has the same groove depth as the groove 3 located in the condensation section 14, and is located in the evaporation section 15 The groove apex angle A1 of the groove 12 is larger than the apex angle A2 of the groove 13 located at the condensing section 14. The top nine Wi and the root width W2 of the groove 12 located in the evaporation section 15 are smaller than the tooth top width Ws and the root width W4 of the groove 13 located in the condensation section 14, respectively, that is, the groove 12 located in the evaporation section 15. The groove width is smaller than the groove width of the groove 13 located in the condensation section 14. _ Referring to FIG. 4, the heat pipe 10 is obtained by the following steps: providing a pipe body 11 having a plurality of fine grooves in the wall of 200819698; reducing the pipe diameter of a portion of the pipe body 11 so that the portion is used as a pipe The evaporation section 15 of the body 11 is evacuated and filled with an appropriate amount of working fluid in the tube body 11; sealed to obtain the desired heat pipe 10. The groove of the inner wall of the pipe body 11 can be formed by drawing along the inner wall of the pipe body 11 in the axial direction of the pipe body 11. Referring to Figures 5 and 6, the evaporation section 15 of the tube 11 can be produced by a high speed rotary tube method. A high-speed rotary shrinking die 20 for the high-speed rotary shrink tube method is a hollow tubular body having a tapered portion 21 corresponding to the transition portion 16, the condensation portion 14, and the evaporation portion 15, respectively, of the heat pipe 10. The guide portion 22 and the thin tube portion 23. The guide portion 22 is located at the foremost end, and the tapered portion 21 is formed by the end of the guide portion 22 being reduced inwardly, and the thin tube portion 23 is connected to the trailing end of the tapered portion 21. The inner diameter of the guiding portion 22 is equal to the outer diameter of the condensation section 14; the inner diameter of the thin tube portion 23 is equal to the expected outer diameter of the evaporation section 15 of the heat pipe 10; the tapered portion 21 is in the process of shrinking the tube The outer diameter of the evaporation section 15 is gradually reduced, and the transition section 16 of the heat pipe 10 is formed after the tube is contracted. The shrinking process of the high speed rotary shrink tube method comprises: fixing the tube body 11 to a work table 40 by at least one fixing tool 50; driving the rotary shrink tube mold 20 to run at a high speed and by the tube body 11 along the axial direction of the heat pipe 10 One end gradually moves to the other end to a certain length, and in the process, the guiding portion 22 of the rotating shrinkable tube mold 20 guides the rotary shrinking tube mold 20 to gradually move forward, and at the same time, the tapered portion 21 of the rotating shrinkable tube mold 20 is The tube body 11 to be shrunk is pressed to gradually reduce the diameter of the tube to obtain the desired evaporation section 15 of the heat pipe 10. Referring to Figures 7 and 8, the evaporation section 15 of the tubular body 11 can be produced by a rotary impact shrinkage method. A rotary impact shrinkage die 30 for use in the rotary impact shrinkage tube method includes at least two partial molds 31 each having a circular arc-shaped inner surface 32, the inner surfaces 32 of the circular arcs being uniform Distributed over an imaginary circumference 33. Each of the partial molds 31 has a diverging portion 34 corresponding to the transition portion 16, the condensation portion 14, and the evaporating portion 15 of the heat pipe 10, a guiding portion 35, and a thin tube portion 36. The diverging portion 34 is ended by one end of the thin tube portion 36. The outer portion is gradually formed, and the guiding portion 35 is formed by extending from the front end of the dilating portion 34. The shrinking process of the rotary impact shrinkage method includes: fixing the pipe body 11 to the table 40 by the fixing tool 50; and driving the split molds 31 of the impact shrinking pipe mold 30 to rotate at a high speed and gradually along the radial direction of the pipe body 11. The tube body 11 of the heat pipe 10 is gradually approached to cause the dilating portion 34 and the thin tube portion 36 to collide with the tube body 11 of the tube portion to be retracted to obtain the desired transition portion 16 and the evaporation portion 15 of the heat pipe 10. In addition, in order to make the length of the obtained evaporation section 15 long enough, the impact shrinkage mode 30 can be driven along the radial direction of the pipe body 11, and the axial movement of the impact shrinkage die 30 along the pipe body 11 can also be driven. . The heat pipe 10 is mechanically processed by a rotary impact shrinkage method or a high-speed rotary shrinkage method, and only the diameter of the evaporation section 15 of the heat pipe 10 is reduced, so that the groove width of the inner groove 12 of the evaporation section 15 of the obtained heat pipe 10 can be obtained. The narrowing and the apex angle are increased. Therefore, compared with a heat pipe having a uniform groove size, the evaporation section 15 of the heat pipe 10 has a small groove size, which can not only improve the overall grooved heat pipe 10 The hair 11 200819698 fine delivery capacity (capillary f〇rce) and the relative maximum capillary heat transfer limit, but also because of the heat transfer area of the evaporation section 15 to increase the density' and thus improve the heat pipe 1 〇 evaporation section 15 The radial radius b or radial heat transfer limit of the load, in contrast, also reduces the thermal resistance of the evaporation section 15 of the heat pipe iq. The heat pipe 1 can achieve the above effects by a simple mechanical processing method, so that it is easy to mass-produce.
可以理解地，該熱管10之蒸發段15亦可位於熱 官10中間等任意區域，如圖9所示，可利用旋轉衝擊 縮官法對位於管體11a中間區域之蒸發段15a進行縮 官，以達到蒸發段15a具有較佳毛細輸送能力及提升 所能負荷之徑向能量密度之功效，而管體lla之兩端 則形成為冷凝段14a，並在蒸發段15a與冷凝段14a 之門$成過渡段16a。為使蒸發段與每一冷凝段 14a之間均形成過渡段16a，可將圖7所示之旋轉衝擊 縮&拉30设计成於細官部36之兩端均設有漸擴部 與導引部35之形式。該熱管1〇射折彎形成為[型 或U型或其他彎折形狀，同時，該熱管ig於縮管完 成後還可以進行打扁操作，以適用於空間有限之筆記 型電腦中進行散熱應用。 ° 综上所述，本發明符合發明專利要件，麦依法提出專 ，申請。惟’以上所述者僅為本發明之較佳實施例，舉凡 熟悉本案技藝之人士 ’在爰依本發明精神所作之等效修 或變化，皆應涵蓋於以下之申請專利範圍内。 ^ 12 200819698 w 【圖式簡單說明】 圖1為本發明熱管一較佳實施方式之示意圖。 . 圖2為圖1所示熱管沿Π-ΙΙ線之剖視圖。 . 圖3為圖1所示熱管沿ΙΙΙ-ΠΙ線之剖視圖。 圖4為圖1所示熱管之其中之一種製造方法之流程圖。 圖5為高速旋轉縮管法之示意圖。 圖6為圖5沿IV4V線之剖視圖。 圖7為旋轉衝擊縮管法之示意圖。 ® 圖8為圖7沿VIII-VIII線之剖視圖。 圖9為本發明熱管另一較佳實施方式之示意圖。 【主要元件符號說明】 孰管 #、、、 pr 10 管體 11、11a 厚度 T 溝槽 12、13 冷凝段 14、 14a 蒸發段 15、15a 過渡段 16、 16a 絕熱段 17 槽深 Η 齒頂角 A1、A2 齒頂寬度 W1， 'W3齒根寬度 W2、W4 旋轉縮管模 20 漸縮部 21 導引部 22 細管部 23 衝擊縮管模 30 分模 31 内表面 32 假想圓周 33 漸擴部 34 導引部 35 細管部 36 工作台 40 固定工具 50 13It can be understood that the evaporation section 15 of the heat pipe 10 can also be located in any area such as the middle of the heat official 10, as shown in FIG. 9, the evaporation section 15a located in the middle area of the pipe body 11a can be contracted by the rotary impact contraction method. In order to achieve the effect of the evaporating section 15a having a better capillary transporting capacity and increasing the radial energy density of the load, the ends of the tubular body 11a are formed as the condensing section 14a and at the gate of the evaporating section 15a and the condensing section 14a. Into the transition section 16a. In order to form a transition portion 16a between the evaporation section and each of the condensation sections 14a, the rotary impact reduction & pull 30 shown in FIG. 7 can be designed to have a diverging portion and a guide at both ends of the thin portion 36. The form of the lead 35. The heat pipe 1 is formed into a [type or U-shaped or other bent shape, and at the same time, the heat pipe ig can be flattened after the shrinking tube is completed, and is suitable for heat dissipation application in a notebook computer with limited space. . ° In summary, the present invention complies with the requirements of the invention patent, and the wheat is proposed in accordance with the law. It is to be understood that the above description is only the preferred embodiment of the present invention, and those skilled in the art of the present invention are to be construed as being limited to the scope of the invention. ^ 12 200819698 w [Simple description of the drawings] Fig. 1 is a schematic view of a preferred embodiment of the heat pipe of the present invention. Figure 2 is a cross-sectional view of the heat pipe of Figure 1 taken along the Π-ΙΙ line. Figure 3 is a cross-sectional view of the heat pipe of Figure 1 taken along the ΙΙΙ-ΠΙ line. 4 is a flow chart showing one of the manufacturing methods of the heat pipe shown in FIG. 1. Fig. 5 is a schematic view of a high speed rotary shrinkage method. Figure 6 is a cross-sectional view taken along line IV4V of Figure 5. Figure 7 is a schematic view of the rotary impact shrinkage tube method. ® Figure 8 is a cross-sectional view of Figure 7 taken along line VIII-VIII. Figure 9 is a schematic view of another preferred embodiment of the heat pipe of the present invention. [Main component symbol description] 孰 pipe#,,, pr 10 pipe body 11, 11a thickness T groove 12, 13 condensation section 14, 14a evaporation section 15, 15a transition section 16, 16a insulation section 17 groove depth 齿 apex angle A1, A2 tooth top width W1, 'W3 tooth root width W2, W4 rotation shrinking tube mold 20 tapered portion 21 guide portion 22 thin tube portion 23 impact shrinking tube mold 30 split mold 31 inner surface 32 imaginary circumference 33 diverging portion 34 Guide portion 35 thin tube portion 36 table 40 fixing tool 50 13