1287612 九、發明說明： 【發明所屬之技術領域】 本發明涉及散熱領域，特別係關於一種利用相變化原理進行傳熱 的網狀式熱管及其製造方法。 #' 【先前技術】 習知散熱領域中，熱管由於具有傳熱快的特點而得到廣泛應用， • 其係利用殼體内的工作液體在氣、液兩相變換時吸收或放出大量熱的 原理進行工作，殼體内壁上通常設置有便於冷凝液體回流的毛細結構 _ (CaPillaryWick struc_)，該毛細結構之功能主要係一方面提供冷凝 後液體快速回流所需的驅動力，另一方面提供殼體内壁與殼體内液氣 介面間的熱傳導路徑。目前常用的毛細結構主要有網狀式、燒結式及 溝槽式三種，其中，網狀式毛細結構一般係由金屬網編織形成，並於 ^ 殼體密封前置入管内而製得網狀式熱管，燒結式毛細結構係由金屬粉 末顆粒高溫燒結於殼體内壁上形成，而溝槽式毛細結構係為直接在殼 體内壁上形成的複數細小溝槽。在使用時，熱管之一端(蒸發端)置於 • 高溫熱源處，殼體内的工作液體受熱而蒸發成氣態，該蒸氣經由殼内 空腔流向熱管之另一端(冷凝端)後放出熱量而冷凝成液態，該冷凝液 體在殼體内壁毛細結構的吸附力下快速返回蒸發端並繼續下一次工 作循環，如此將熱量從一處傳遞至另一處。 就網狀式熱管而$，其中置入的金屬網式毛細結構與殼體的内壁 貼合是否緊密，將影響熱量在殼體與殼體内液氣介面之間的傳遞，對 熱傳性質產生較大的影響，因此，為獲得良好的傳熱效果，業界常採 用支#結構對毛細機構進行支律，以使毛細結構緊貼於殼體内壁上， 如業界採用之於殼體内置入螺旋彈簧或者置入與殼體同軸心的支撐 内管。 然而，螺旋彈簧由於接觸面積小而不能對整個毛細結構產生均衡 的抵壓力，支撐内官雖可對毛細結構提供均衡之抵壓力，但熱管在較 1287612 多，運㈣合巾，常需進储彎献壓融滿足實際絲，比如在將 熱官運用於筆記型魏時，通常需將鮮折彎或打錢再細，以充 分利用有限之_，而上述支彻管由於具有餅之雛，在進行折 幫或者打糾賴克服支撐崎較大觸性，因此給折彎及打爲工序 帶來較大不便’並不，統在-槐度上魏細結構的破壞。 【發明内容】 ： 本發明之目的在於提供一種可對毛細結構提供均衡抵壓力且便 於折彎或者打扁的網狀式熱管。 本發明之另一目的在於提供一種上述網狀式熱管的製造方法。 本發明網狀式熱管包括外管、内管及夾設於外管與内管之間的網 狀式毛細結構層，該内管對所述毛細結構層進行支撐使其貼於外管， 該内管上設置有切口且其表面貫穿設有複數孔洞。 上述網狀式熱管的製造方法包括如下步驟：提供一外管；提供一 貫穿設有複數孔洞的内管，且該内管上設置有切口；包覆一網狀式毛 細結構層於所述内管的外壁上；及加熱外管並將所述内管與毛細結構 層***該外管中。 本發明網狀式熱管由於内管設置有切口，因而除了能夠對毛細結 構層提供足夠且均衡的抵壓力外，還可方便地於切口處進行折彎或者 打扁以適應現代電子散熱領域中，如筆記型電腦中。 【實施方式】 第一圖爲本發明網狀式熱管第一實施例的轴向剖面示意圖，該熱 管10包括一外管12、一内管14及夾設於外管12與内管14之間的網狀式 毛細結構層16。其中，該外管12由導熱性能良好之金屬如銅等製成， 該内管14對設於外管12内壁的毛細結構層16提供均衡的外張抵壓 力’以使毛細結構層16整體緊貼於外管;[2的内壁上，從而在外管12與 管内的工作液體(圖未示)之間提供良好且有效的熱傳通道。該内管14 的表面上設有貫穿的複數圓形的孔洞142，以便使充填於管内的工作 1287612 液體通過該等孔洞142並與毛細結構層16循環相通，該等孔洞142以佔 内管14整體表面積的70%左右為佳，如此既可對毛細結構層16提供較 佳且均衡的彈性抵壓力，亦可使工作液體較順利地經由孔洞142而與 毛細結構層16相通。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of heat dissipation, and more particularly to a mesh heat pipe utilizing a phase change principle for heat transfer and a method of manufacturing the same. #' [Prior Art] In the field of heat dissipation, heat pipes are widely used due to their fast heat transfer characteristics. • The principle of using a working fluid in a housing to absorb or release a large amount of heat during gas-liquid two-phase transformation. For the work, the inner wall of the casing is usually provided with a capillary structure _ (CaPillaryWick struc_) for facilitating the return of the condensed liquid. The function of the capillary structure is mainly to provide the driving force required for the rapid recirculation of the liquid after condensation, and to provide the casing on the other hand. A heat conduction path between the inner wall and the liquid-gas interface in the housing. At present, the commonly used capillary structures are mainly mesh type, sintered type and groove type. Among them, the mesh type capillary structure is generally formed by weaving a metal mesh, and is placed in the tube before the shell is sealed to obtain a mesh type. The heat pipe and the sintered capillary structure are formed by high-temperature sintering of metal powder particles on the inner wall of the casing, and the grooved capillary structure is a plurality of fine grooves formed directly on the inner wall of the casing. In use, one end of the heat pipe (evaporation end) is placed at the high temperature heat source, and the working liquid in the casing is heated to evaporate into a gaseous state, and the vapor flows through the inner cavity of the casing to the other end (condensing end) of the heat pipe to release heat. Condensation into a liquid state, which quickly returns to the evaporation end under the adsorption of the capillary structure of the inner wall of the casing and continues to the next working cycle, thus transferring heat from one place to another. In the case of a mesh type heat pipe, the metal mesh type capillary structure placed therein is closely attached to the inner wall of the casing, which will affect the transfer of heat between the casing and the liquid gas interface in the casing, and the heat transfer property is generated. A large influence, therefore, in order to obtain a good heat transfer effect, the industry often uses the structure of the branch to control the capillary mechanism so that the capillary structure is closely attached to the inner wall of the casing, as the industry adopts the spiral built into the casing. The spring is either placed in the inner tube that is concentric with the housing. However, due to the small contact area, the coil spring can not produce a balanced pressure on the entire capillary structure. Although the support inner officer can provide a balanced pressure on the capillary structure, the heat pipe is more than 1287612, and the (4) towel is often required to be stored. Bend the pressure to meet the actual silk, for example, when applying the hot official to the notebook type Wei, it is usually necessary to make a fresh bend or a money and then fine to make full use of the limited _, and the above-mentioned support tube has a cake, In the case of folding or tying to overcome the large contact of the support, it is inconvenient to bend and hit the process. SUMMARY OF THE INVENTION: It is an object of the present invention to provide a mesh heat pipe which can provide a balanced pressure to a capillary structure and which is convenient for bending or flattening. Another object of the present invention is to provide a method of manufacturing the above-described mesh heat pipe. The mesh heat pipe of the present invention comprises an outer tube, an inner tube and a mesh-shaped capillary structure layer sandwiched between the outer tube and the inner tube, the inner tube supporting the capillary structure layer to be attached to the outer tube, The inner tube is provided with a slit and a plurality of holes are formed in the surface thereof. The method for manufacturing the above-mentioned mesh heat pipe comprises the steps of: providing an outer tube; providing an inner tube penetrating a plurality of holes, wherein the inner tube is provided with a slit; and coating a mesh capillary structure layer therein On the outer wall of the tube; and heating the outer tube and inserting the inner tube and capillary structure into the outer tube. The mesh type heat pipe of the present invention is provided with a slit in the inner tube, so that in addition to providing sufficient and balanced pressure to the capillary structure layer, it can be conveniently bent or flattened at the incision to adapt to the field of modern electronic heat dissipation. Such as in a notebook computer. The first embodiment is an axial cross-sectional view of a first embodiment of a mesh heat pipe according to the present invention. The heat pipe 10 includes an outer tube 12 , an inner tube 14 , and an outer tube 12 and an inner tube 14 . The mesh-like capillary structure layer 16. Wherein, the outer tube 12 is made of a metal having good thermal conductivity, such as copper, etc., and the inner tube 14 provides a balanced external tensioning force on the capillary structure layer 16 provided on the inner wall of the outer tube 12 to make the capillary structure layer 16 tight overall. Adhered to the outer tube; [2's inner wall to provide a good and efficient heat transfer path between the outer tube 12 and the working fluid (not shown) in the tube. A plurality of circular holes 142 are formed in the surface of the inner tube 14 so that the liquid 1287612 filled in the tube passes through the holes 142 and circulates with the capillary structure layer 16, and the holes 142 occupy the inner tube 14 Preferably, about 70% of the total surface area provides a preferred and uniform elastic biasing force to the capillary structure layer 16, and the working fluid can be smoothly communicated with the capillary structure layer 16 via the holes 142.
為便於進行折彎，該内管14以未貫穿其管體的切口 144分割形成 為轴向之兩段式結構，圖中所示該切口 144為沿内管14之徑向設置， 便於從該切口M4處進行折彎操作。相比習知技術而言，本發明由於 該切口 144之存在，於折彎時無須克服内管自身較大之剛性，使折 彎工序變得更容易，且可一次折彎到位，在折彎處減少應力產生，減 少對管内毛細結構層16造成破壞的機率。 可以理解地’如果熱管1〇需在多處進行折彎，則可相應地設置更 多的切口 144而將内管14設為多段，當然，該切口144除沿徑向設置 外，還可在此基礎上沿該徑向呈一定角度設置。為進一步加強内管14 的塑性以更有利於折彎，該内管14可由有機材料如聚酰胺等聚合物製 成，亦或由具有彈性的金屬材料如銅、鋁等製成，當然，在選擇内管 I4之材料時，還必須考慮其與工作液體之I容問題，即必須能夠與工 作液體共存而不相互影響。該毛細結構層10可由金屬網或纖維束編織 形成:其包覆在内管14的外壁上，並藉由内管14的彈性外張力而緊貼 於外官12的内壁上，以提供工作液體回流所需的驅動力。 上述網狀式熱管10之製程也相對較簡單，如第二圖所示，可先在 已經成型之具有切口 144之多段式内管14上包覆—網狀式毛細結構層 16，然後加管12使其膨脹，再將包覆有毛細結構層16的内管_ 入麵外管!2内，待外管12自然冷卻收縮後，即緊緊地包覆該多孔之 内管14，從而將毛細結構層16夹設於内管14與外管12之間。 孔洞242 第三圖與細騎示為本發明所湖崎之另_#顧，該内管 24係形成雜糾__段絲構，兩段之間完全躺娜成徑向 切口244，以便於該斷開處進行折彎，且内管％表面上貫料有複數 1287612 第五圖與第六圖所示為本發明所採用内管之另一實施例，為便於 進行打扁，該内管34由其兩端往中間沿與内管34轴向平行的方向設置 有切口344，以便於打扁。相比習知技術而言，本發明由於該切口344 之存在，降低了内管34之整體剛性，並可在打扁時提供一釋放應力之 空間，使打扁工序變得更容易，即時釋放打扁過程中產生的應力，減 少對管内毛細結構層16造成破壞的機率。可以理解地，該切口344可 以設置成更多的其他型態，如設置多道，或者相互交錯設置等，為同 時實現便於折彎及打扁，還可同時在内管上設置徑向與軸向切口。 本發明之網狀式熱管，所採用之多孔隙之内管14可對網狀式毛細 結構層16產生均衡的外張抵壓力，使該毛細結構層16與外管12之内壁 貼合良好，在外管12與管内之工作液體之間體供高效的熱傳導路徑， 達到良好的傳熱功效；同時，由於内管12上設置有便於進行折彎或者 打爲的切口’可方便地於切口處進行折彎或者打扁以適應現代電子散 熱領域中，如筆記型電腦。 本發明之内管上所設之孔洞以形成一定圖案為佳，如第七圖所 示，該板材40上設置的圓孔42形成平行交錯排佈狀，所述圓孔42可以 通過各種方式如衝壓或鑄造等成型板材4〇上，之後將該板材4〇捲成圓 筒狀即可獲得本發明之内管。可以理解地，上述圓孔42亦可改設為其 他形狀，如方形、三角形、多邊形或者其他幾何形狀。 綜上所述，本發明確已符合發明專利之要件，遂依法提出專利申 請。惟’以上所述者僅為本發明之較佳實施例，自不能以此限制本案 之申請專利範圍。舉凡熟悉本案技藝之人士援依本發明之精神所作之 等效修飾或變化，皆應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 第一圖係本發明網狀式熱管第一實施例的轴向剖面示意圖。 第二圖係第一圖所示熱管之製造方法立體示意圖。 第三圖係本發明網狀式熱管中内管之另一實施例。 1287612 第四圖係第三圖沿A-A方向的剖示圖。 第五圖係本發明網狀式熱管中内管之又一實施例。 第六圖係第五圖沿B-B方向的剖示圖。 第七圖係本發明所採用内管之平面展開示意圖。 【主要元件符號說明】 熱管 10 外管 12 内管 14、24、34 毛細結構層 16 孔洞 142、242 切口 144 ^ 244 > 344 板材 40 圓孔 42In order to facilitate the bending, the inner tube 14 is divided into an axial two-stage structure by a slit 144 which is not penetrated through the tube body, and the slit 144 is disposed along the radial direction of the inner tube 14 so as to facilitate the bending. A bending operation is performed at the slit M4. Compared with the prior art, the present invention does not need to overcome the rigidity of the inner tube itself when bending, so that the bending process becomes easier, and the bending can be performed in one time, in the bending. Reduce stress generation and reduce the chance of damage to the capillary structure layer 16 within the tube. It can be understood that if the heat pipe 1 needs to be bent at multiple places, more slits 144 can be provided correspondingly to set the inner tube 14 into a plurality of sections. Of course, the slits 144 can be arranged in addition to the radial direction. This is based on the radial direction at an angle. In order to further strengthen the plasticity of the inner tube 14 to facilitate bending, the inner tube 14 may be made of a polymer such as a polymer such as polyamide, or may be made of a resilient metal material such as copper, aluminum, or the like. When selecting the material of the inner tube I4, it must also consider the problem with the working fluid, that is, it must be able to coexist with the working liquid without affecting each other. The capillary structure layer 10 may be formed by weaving a metal mesh or a fiber bundle: it is coated on the outer wall of the inner tube 14 and is closely attached to the inner wall of the outer portion 12 by the elastic external tension of the inner tube 14 to provide a working liquid. The driving force required for reflow. The process of the above-mentioned mesh heat pipe 10 is also relatively simple. As shown in the second figure, the meshed capillary structure layer 16 can be coated on the formed multi-section inner tube 14 having the slit 144, and then the tube is added. 12, so that it expands, and then the inner tube of the capillary structure layer 16 is wrapped into the outer tube! 2, and after the outer tube 12 is naturally cooled and contracted, the porous inner tube 14 is tightly wrapped, thereby The capillary structure layer 16 is interposed between the inner tube 14 and the outer tube 12. The third figure of the hole 242 and the fine ride are shown as the other _#Gu of the invention, the inner tube 24 forms a silk structure of the miscellaneous __ segment, and the two sections are completely lie together into a radial slit 244, so as to facilitate The break is bent, and the inner tube % is perforated with a plurality of 1287612. The fifth and sixth figures show another embodiment of the inner tube used in the present invention. A slit 344 is provided from the both ends to the middle in a direction parallel to the axial direction of the inner tube 34 to facilitate flattening. Compared with the prior art, the present invention reduces the overall rigidity of the inner tube 34 due to the presence of the slit 344, and provides a space for releasing stress when flattening, making the flattening process easier and immediate release. The stress generated during the flattening process reduces the chance of damage to the capillary structure layer 16 within the tube. It can be understood that the slit 344 can be set to more other types, such as multiple channels, or staggered, etc., in order to simultaneously facilitate folding and flattening, and simultaneously set the radial and the shaft on the inner tube. To the incision. In the mesh heat pipe of the present invention, the porous inner tube 14 can have a balanced external tensile pressure on the mesh capillary structure layer 16, so that the capillary structure layer 16 and the inner wall of the outer tube 12 are well adhered. An efficient heat transfer path is provided between the outer tube 12 and the working liquid in the tube to achieve good heat transfer efficiency; at the same time, since the inner tube 12 is provided with a slit for facilitating bending or beating, it can be conveniently performed at the slit. Bend or flatten to accommodate modern electronic cooling, such as notebook computers. Preferably, the holes provided in the inner tube of the present invention are formed into a pattern. As shown in the seventh figure, the circular holes 42 provided in the plate 40 are formed in a parallel staggered arrangement, and the circular holes 42 can be formed by various means such as The inner tube of the present invention can be obtained by rolling a sheet or the like into a cylindrical sheet, and then winding the sheet 4 into a cylindrical shape. It will be appreciated that the circular apertures 42 can be modified to other shapes, such as square, triangular, polygonal or other geometric shapes. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS The first drawing is a schematic axial cross-sectional view of a first embodiment of a mesh heat pipe of the present invention. The second figure is a perspective view of the manufacturing method of the heat pipe shown in the first figure. The third figure is another embodiment of the inner tube in the reticulated heat pipe of the present invention. 1287612 The fourth figure is a cross-sectional view of the third figure along the A-A direction. The fifth drawing is still another embodiment of the inner tube in the reticulated heat pipe of the present invention. The sixth drawing is a cross-sectional view of the fifth figure in the B-B direction. The seventh drawing is a schematic plan view of the inner tube used in the present invention. [Main component symbol description] Heat pipe 10 Outer tube 12 Inner tube 14, 24, 34 Capillary structure layer 16 Hole 142, 242 Incision 144 ^ 244 > 344 Plate 40 Round hole 42