200803701 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種散熱器，特別是一種適用於電子元 件散熱的散熱器。 【先前技術】 隨著中央處理器（CPU)等電子元件功率的不斷提 高，散熱問題越來越受到人們的重視，在電腦中更是 如此。爲了在有限的空間裏高效地帶走系統産生的熱 量，目前業界主要採用由散熱鰭片、熱管及散熱風扇 組合的方式進行散熱。風扇主要是提供流動的空氣， 熱管主要爲了遠距離傳遞熱量，散熱鰭片的任務則是 將熱管帶來的熱量通過風扇驅動所産生的流動空氣傳 遞到外界環境中去。由此可見，在固定之體積空間内， 能否及時疏導電子元件所産生之熱量取決於是否有一 個高效的散熱鰭片。若採用平板結構的散熱鰭片，當 風扇氣流流經散熱鰭片時，由於黏性力的影響，散熱 鰭片表面與氣流的接觸部分形成層流底層，在該層流 底層内氣流之流速幾乎爲零，熱交換效果大大降低。 因此若能提升散熱鰭片與風扇氣流之換熱效果，就可 大大提升散熱器之散熱效果。 【發明内容】 有鑒於此，實有必要提供一種能提升散熱效率的散熱 器。 該散熱器包括複數平行設置的散熱鰭片及一穿設於鰭 片上之熱管，相鄰散熱鰭片之間形成供氣流通過之流 6 200803701 道，每一散熱鰭片上設有供該熱管穿過之通孔，每一 散熱鰭片上于通孔周圍設有複數凸起，所述複數凸起 在氣流行進方向上整體排列呈收縮狀。 該散熱器的散熱鰭片上形成凸起，可增大散熱鰭片散 熱面積，同時還可導引氣流之流動並改善氣流流場， 增強在散熱鰭片表面之擾流效果，有效提升散熱效率。 【實施方式】 下面參照附圖，結合實施例作進一步說明。 如圖1所示，該散熱器包括一散熱鰭片組10, 一 穿設於該散熱鰭片組10上之熱管40，及一置於散熱 鰭片組10 —端用於提供強制氣流之散熱風扇60。風 扇60所産生之氣流可沿圖中箭頭所示方向流入散熱 鰭片組10内，從而與散熱鰭片組10進行熱交換帶走 熱量。 請同時參考圖2至圖4,該散熱鰭片組10包括複數 相互平行設置之鰭片20,每一鰭片20包括一本體201 及分別形成於本體201兩端之折邊203，各鰭片20之 折邊203相互抵靠，從而於相鄰兩鰭片20之間形成一 沿折邊203長度方向延伸之流道23。每一鰭片20靠 近風扇60之側端設有一通孔25，該通孔25之形狀大 小與熱管40之橫截面形狀大小相對應，如根據熱管之 形狀可爲圓形、方形等，以便於熱管40之穿設。該實 施例中，通孔25大致呈方形，其邊角形成圓弧倒角。 鰭片20自通孔25之周緣向外延伸形成一環形凸緣 7 200803701 27，該凸緣27之高度與相鄰兩鰭片20之間的間距大 致相等，從而所述散熱鰭片組10組裝爲一體時，每一 鰭片20之凸緣27與相鄰的鰭片20之本體201相抵 靠，所述凸緣27共同形成一容置熱管40之柱狀容置 空間，可有效增加熱管40與鰭片20之接觸面積，使 熱管40之熱量更好的傳遞至鰭片20。 如圖2及圖4所示，每一鰭片20上形成四個凸起 221、 222、223、224 ° 所述凸起 221、222、223、224 分佈于通孔25周圍，相對于通孔25沿鰭片20長度方 向上的對稱軸X-X，所述凸起221、222、223、224 呈非對稱分佈，其中第一、第二凸起221、222位於軸 線X-X的下側，第三凸起223位於軸線X-X的上側， 第四凸起224位於軸線X-X上，沿氣流之流向，該第 四凸起224位於通孔25的正後方。該第一凸起221 大致位於通孔25的正下方，沿氣流之流向，第二、第 三凸起222、223則分設于通孔25的後側，從而可有 效增強散熱鰭片20對應于熱管40後方位置之換熱面 積及擾流效果。第一、第二、第三凸起221、222、223 均相對轴線X-X呈傾斜狀設置，每一凸起221 ( 222、 223)沿氣流之流向自鰭片20的邊緣位置向鰭片20 的中部傾斜延伸，且該第一、第二、第三凸起221、 222、 223的傾斜角度不一，從而與軸線X-X分別形成 大小不同的夾角，即第一凸起221與軸線X-X的夾角 小於第二凸起222或第三凸起223與軸線X-X所形成 8 200803701 的夾角。即沿氣流的流向看，所述凸起221、222、223 于熱管通孔25周圍形成一漸縮狀空間，可有效引導氣 流集中流向鰭片20對應熱管40後方的位置，增強該 部分之熱交換效果。如圖3所示，在鰭片20的另一側 對應四個凸起221、222、223、224的位置分別形成四 個長條形凹陷24。所述凹陷24的設置使鰭片20背面 呈非平面狀，同樣可增強氣流之擾流效果。該凹陷24可 通過衝壓等方式一體成型於鰭片20上，並同時形成上述凸 起 22卜 222 、 223 、 224 ° 熱管40包括一用於與熱源接觸之蒸發部（圖未示） 及穿設於所述鰭片20上之冷凝部，利用熱管40快速 的導熱性能可將熱源所産生之熱量快速均勻地傳遞至 鰭片20上。 該散熱器工作時，熱管40之蒸發部吸收熱源産生 的熱量，熱管40内之液態工作介質吸熱蒸發並向熱管40 之冷凝部流動，然後於冷凝部釋放自熱源所吸收之熱量並 冷凝回流至蒸發部進入下一次循環，如此反復地進行吸 收、釋放大量潛熱，將熱源所産生之熱量快速地傳遞 至鰭片20。熱管40將熱量傳遞至鰭片20時，鰭片20 靠近熱管40的區域，即通孔25之周緣區域内的熱量 較爲集中，形成熱量密集區，而風扇60所産生之強制 氣流被熱管40擋住而不能直接到達熱管40的正後 方，熱管40後方區域與氣流之熱交換效果相對較弱， 因此熱量密集區又以熱管40後方區域更爲嚴重。當氣 9 200803701 流沿圖1中箭頭所示方向進入鰭片20之間所形成的流 道23内時，由於鰭片2〇上四個長條形凸起221、222、 223、224在氣流行進方向上整體呈收縮狀排列，可導引 氣流流向鰭片20之熱量密集區，並在熱管4〇後方區域 形成紊流’使該熱量密集區内之熱量快速地被風扇60所 産生之氣流帶走。另外，氣流在流經鰭片2〇表面時， 由於黏性力等因素之影響，在鰭片2〇表面形成一層流底 層，而凸起221、222、223、224的設置則相當於在氣流 的流道上設置一障礙物，可有效破壞形成於鰭片2〇表面的 層流底層，增強氣流在鰭片2〇表面處之擾流效果，加強鰭 片20與氣流之間的熱交換，最終提升散熱器的整體散熱效 果。鰭片20上四個長條形凸起221、222、223、224之 形成同時也增大了鰭片2〇與氣流接觸之熱交換面積，有利 於散熱效率之提升。 該實施例中，所述凸起呈非對稱設置于通孔周圍，沿 氣流行進方向，凸起主要分佈于熱管所穿設之通孔的後 方，且通孔兩側之凸起數量亦不相同，位於轴線χ_χ上側 的凸起之數塁小於下側的凸起之數量，且各凸起之間亦呈 非平行設置。實際上，凸起221、222、223、224之數量 可根據縛片2G以及熱管4〇的狀況而設^，可爲兩個或更 多個其排列方式也可變化，如可根據熱管40在鰭片20 上穿過之具體位置，適當調整各個凸㈣排列，也可在 熱管40的前方添設凸起。各個凸起可以平行排列或者平行 與不平行組合_ U隸體制沿氣流行進方向呈收 200803701 縮狀’能起到引導氣流並加強氣流熱交換之功用即可。各 個凸起的形狀也不僅僅限於長條形狀’可以爲㈣形或其 他形狀，也可以是圓弧形與長條形或其他形狀之組合，其 大小可以相職不相同。只要能改善錢流場，增強擾流 政果’本判可㈣±mm彡式實現。 ，上所述’本發料合發财利之要件，練法提出 =申請。_上所述者僅為本發明之較 熟悉本案技藝之人士，+< t L 或變化，、友依 精神所作之等效修飾 :似涵盍於从下之申請專利範圍内。 【圖式簡單說明】 圖 1爲散熱器立體示意圖 〇 圖 2爲散熱鰭片組分解示 意圖。 圖 3爲圖2的另一角度視圖。 圖4爲其中一散熱鳍片俯視圖。 【主要元件符號說明】 10 鰭片組 20 201 本體 203 221 第一凸起 222 223 第三凸起 224 23 流道 24 25 通孔 27 40 敎管 #、、、 & 60 鰭片 折邊 第二凸起 第四凸起 凹陷 凸緣 風扇 11200803701 IX. Description of the Invention: [Technical Field] The present invention relates to a heat sink, and more particularly to a heat sink suitable for heat dissipation of electronic components. [Prior Art] With the continuous improvement of the power of electronic components such as a central processing unit (CPU), the problem of heat dissipation has been receiving more and more attention, especially in computers. In order to efficiently remove the heat generated by the system in a limited space, the industry currently uses a combination of heat sink fins, heat pipes and cooling fans to dissipate heat. The fan mainly provides flowing air. The heat pipe mainly transfers heat for a long distance. The task of the heat dissipation fins is to transfer the heat generated by the heat pipe to the external environment through the flow air generated by the fan drive. It can be seen that in a fixed volume, the heat generated by the timely discharge of the sub-components depends on whether there is an efficient fin. If the fins of the flat structure are used, when the fan airflow flows through the fins, the contact surface of the fins and the airflow form a laminar bottom layer due to the adhesive force, and the flow velocity of the airflow in the laminar flow layer is almost At zero, the heat exchange effect is greatly reduced. Therefore, if the heat exchange effect between the heat sink fin and the fan airflow can be improved, the heat dissipation effect of the heat sink can be greatly improved. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a heat sink capable of improving heat dissipation efficiency. The heat sink includes a plurality of heat-dissipating fins disposed in parallel and a heat pipe disposed on the fins, and a flow between the adjacent heat-dissipating fins is formed between the adjacent heat-dissipating fins, and the heat-dissipating fins are disposed on each of the heat-dissipating fins. The through hole has a plurality of protrusions around the through hole on each of the heat dissipation fins, and the plurality of protrusions are arranged in a contraction shape in the air flow direction. The heat sink fins of the heat sink form protrusions, which can increase the heat dissipation area of the heat dissipation fins, and can also guide the flow of the airflow and improve the airflow flow field, enhance the spoiler effect on the surface of the heat dissipation fins, and effectively improve the heat dissipation efficiency. [Embodiment] Hereinafter, the embodiments will be further described with reference to the accompanying drawings. As shown in FIG. 1 , the heat sink includes a heat dissipation fin assembly 10 , a heat pipe 40 disposed on the heat dissipation fin assembly 10 , and a heat dissipation fin assembly 10 disposed at the end of the heat dissipation fin assembly 10 for providing forced airflow. Fan 60. The airflow generated by the fan 60 can flow into the heat-dissipating fin group 10 in the direction indicated by the arrow in the figure, thereby performing heat exchange with the heat-dissipating fin group 10 to remove heat. Referring to FIG. 2 to FIG. 4 , the heat dissipation fin assembly 10 includes a plurality of fins 20 disposed in parallel with each other. Each of the fins 20 includes a body 201 and a flange 203 respectively formed at two ends of the body 201 . The flanges 203 of 20 abut each other to form a flow path 23 extending along the length of the flange 203 between the adjacent fins 20. Each of the fins 20 is disposed near a side end of the fan 60. The through hole 25 has a shape corresponding to the cross-sectional shape of the heat pipe 40, and may be circular or square according to the shape of the heat pipe. The heat pipe 40 is worn. In this embodiment, the through hole 25 is substantially square, and its corners are rounded and chamfered. The fins 20 extend outward from the periphery of the through hole 25 to form an annular flange 7 200803701 27, the height of the flange 27 is substantially equal to the spacing between the adjacent fins 20, so that the heat dissipation fin assembly 10 is assembled. When integrated, the flange 27 of each of the fins 20 abuts against the body 201 of the adjacent fins 20, and the flanges 27 together form a columnar accommodating space for accommodating the heat pipe 40, which can effectively increase the heat pipe 40. The contact area with the fins 20 allows the heat of the heat pipe 40 to be better transferred to the fins 20. As shown in FIG. 2 and FIG. 4, four protrusions 221, 222, 223, and 224 are formed on each of the fins 20. The protrusions 221, 222, 223, and 224 are distributed around the through hole 25 with respect to the through hole. 25 along the axis of symmetry XX in the longitudinal direction of the fin 20, the protrusions 221, 222, 223, 224 are asymmetrically distributed, wherein the first and second protrusions 221, 222 are located on the lower side of the axis XX, the third convex The second protrusion 224 is located on the upper side of the through hole 25, and the fourth protrusion 224 is located on the axis XX, along the flow direction of the air flow, and the fourth protrusion 224 is located directly behind the through hole 25. The first protrusions 221 are located substantially directly below the through holes 25, and the second and third protrusions 222 and 223 are disposed on the rear side of the through holes 25, so that the heat dissipation fins 20 can be effectively enhanced. The heat exchange area and the spoiler effect at the position behind the heat pipe 40. The first, second, and third protrusions 221, 222, and 223 are disposed obliquely with respect to the axis XX, and each of the protrusions 221 (222, 223) flows along the airflow toward the edge of the fin 20 toward the fin 20. The central portion of the first, second, and third protrusions 221, 222, and 223 has different inclination angles, thereby forming an angle different from the axis XX, that is, an angle between the first protrusion 221 and the axis XX. It is smaller than the angle formed by the second protrusion 222 or the third protrusion 223 and the axis XX formed by 8200803701. That is, along the flow direction of the airflow, the protrusions 221, 222, and 223 form a tapered space around the heat pipe through hole 25, which can effectively guide the airflow to the position of the fin 20 corresponding to the rear of the heat pipe 40, and enhance the heat of the portion. Exchange effect. As shown in Fig. 3, four elongated recesses 24 are formed at positions corresponding to the four projections 221, 222, 223, 224 on the other side of the fin 20, respectively. The arrangement of the recesses 24 makes the back surface of the fins 20 non-planar, which also enhances the spoiler effect of the airflow. The recess 24 can be integrally formed on the fin 20 by stamping or the like, and simultaneously form the protrusion 22, 222, 223, 224 °. The heat pipe 40 includes an evaporation portion (not shown) for contacting the heat source and the through hole. The heat transfer performance of the heat pipe 40 can quickly and uniformly transfer the heat generated by the heat source to the fins 20 on the condensing portion of the fins 20. When the heat sink is in operation, the evaporation portion of the heat pipe 40 absorbs the heat generated by the heat source, and the liquid working medium in the heat pipe 40 absorbs heat and evaporates and flows to the condensation portion of the heat pipe 40, and then releases the heat absorbed by the heat source in the condensation portion and condenses and returns to the condensation portion. The evaporation portion enters the next cycle, so as to repeatedly absorb and release a large amount of latent heat, and the heat generated by the heat source is quickly transmitted to the fins 20. When the heat pipe 40 transfers heat to the fins 20, the fins 20 are close to the heat pipe 40, that is, the heat in the peripheral region of the through holes 25 is concentrated to form a heat-intensive region, and the forced airflow generated by the fan 60 is used by the heat pipe 40. Blocking and not directly reaching the rear of the heat pipe 40, the heat exchange effect between the area behind the heat pipe 40 and the air flow is relatively weak, so that the heat-intensive area is further severed by the rear area of the heat pipe 40. When the gas 9 200803701 flows into the flow path 23 formed between the fins 20 in the direction indicated by the arrow in FIG. 1, the four elongated protrusions 221, 222, 223, 224 on the fin 2 are in the air flow. The whole direction of the traveling direction is contracted, which can guide the airflow to the heat-intensive area of the fin 20, and form a turbulent flow in the area behind the heat pipe 4, so that the heat in the heat-intensive area is quickly generated by the fan 60. take away. In addition, when the airflow flows through the surface of the fin 2, a layer of flow bottom layer is formed on the surface of the fin 2 due to factors such as adhesive force, and the arrangement of the protrusions 221, 222, 223, 224 is equivalent to the air flow. An obstacle is arranged on the flow channel to effectively break the laminar bottom layer formed on the surface of the fin 2, enhance the turbulence effect of the airflow at the surface of the fin 2, and enhance the heat exchange between the fin 20 and the airflow, and finally Improve the overall heat dissipation of the heat sink. The formation of the four elongated protrusions 221, 222, 223, 224 on the fin 20 also increases the heat exchange area of the fins 2 〇 in contact with the air flow, which is advantageous for the improvement of heat dissipation efficiency. In this embodiment, the protrusions are asymmetrically disposed around the through hole, and the protrusions are mainly distributed behind the through holes through which the heat pipes are disposed, and the number of protrusions on both sides of the through holes are different. The number of protrusions on the upper side of the axis χ_χ is smaller than the number of protrusions on the lower side, and the protrusions are also arranged non-parallel. In fact, the number of the protrusions 221, 222, 223, 224 may be set according to the condition of the tab 2G and the heat pipe 4, and the arrangement may be two or more, as may be according to the heat pipe 40. The specific position of the fins 20 is passed through, and the respective convex (four) arrangements are appropriately adjusted, and protrusions may be added in front of the heat pipes 40. The protrusions can be arranged in parallel or in parallel and non-parallel combination. The U-system can be used in the direction of airflow. The 200803701 shrinkage can function to guide the airflow and enhance the heat exchange of the airflow. The shape of each of the protrusions is not limited to the strip shape 'may be a (four) shape or the like, or may be a combination of a circular arc shape and a long strip shape or other shapes, and the size may be different. As long as it can improve the money flow field and enhance the turbulence policy, this judgment can be achieved by (4) ± mm彡. , the above mentioned 'the hair of the hair, the requirements of the law, the practice of the law = apply. The above is only the person skilled in the art of the present invention, +<t L or change, and the equivalent modification of the spirit of the friend: it is intended to be within the scope of the patent application. [Simple diagram of the diagram] Figure 1 is a perspective view of the heat sink. Figure 2 shows the decomposition of the fin assembly. Figure 3 is another perspective view of Figure 2. Figure 4 is a top plan view of one of the heat sink fins. [Main component symbol description] 10 Fin set 20 201 Main body 203 221 First protrusion 222 223 Third protrusion 224 23 Flow path 24 25 Through hole 27 40 Tube #, ,, & 60 Fin hemming second Raised fourth raised recessed flange fan 11