1321984 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種散熱裝置，特別係一種適用於發 熱電子元件之散熱裝置。 【先前技術】 當前，隨著電腦産業之迅速發展，微處理晶片等 發熱電子元件産生之熱量愈來愈多。在筆記型電腦中 更是如此，爲在有限之空間内高效地帶走發熱電子元 件産生之熱量，目前業界主要採用由散熱鰭片（Fin)、 熱導管及散熱風扇組成之散熱裝置進行散熱。其中， 由發熱電子元件産生之熱量經熱導管傳遞給散熱鰭 片，再由散熱風扇將散熱鰭片上之熱量帶走。故散熱 風扇與散熱鰭片之選擇及搭配使用對散熱裝置之散 熱效果有非常大之影響。 請參照圖9，其所示爲一種習知之散熱裝置40， 該散熱裝置40包括一離心風扇42及一散熱器44。該散 熱器44具有複數平行排列之散熱鰭片442，並與一發 熱電子元件（圖未示）熱連接，以吸收該發熱電子元件 産生之熱量。該離心風扇42包括一殼體422、一定子（圖 未示）及一轉子423,該離心風扇42之殼體422形成有一 出風口 421，該散熱器44位於該出風口 421處。當該離 心風扇42運轉時，轉子423產生一冷却氣流46對該散 熱器44進行强制散熱。 因製程及成本之關係，上述散熱器44中之散熱鰭1321984 IX. Description of the Invention: [Technical Field] The present invention relates to a heat dissipating device, and more particularly to a heat dissipating device suitable for heating electronic components. [Prior Art] Currently, with the rapid development of the computer industry, heat generated by heat-generating electronic components such as micro-processed wafers is increasing. This is especially true in notebook computers. In order to efficiently dissipate the heat generated by the heating electronic components in a limited space, the industry currently uses heat sinks composed of fins, heat pipes and cooling fans for heat dissipation. The heat generated by the heat-generating electronic component is transmitted to the heat-dissipating fin through the heat pipe, and the heat-dissipating fan removes the heat on the heat-dissipating fin. Therefore, the choice of the heat sink fan and the heat sink fins and the use of the heat sink have a great influence on the heat dissipation effect of the heat sink. Referring to FIG. 9 , a conventional heat sink 40 is illustrated. The heat sink 40 includes a centrifugal fan 42 and a heat sink 44 . The heat sink 44 has a plurality of heat radiating fins 442 arranged in parallel and thermally coupled to a heat generating electronic component (not shown) to absorb heat generated by the heat generating electronic components. The centrifugal fan 42 includes a housing 422, a stator (not shown), and a rotor 423. The housing 422 of the centrifugal fan 42 is formed with an air outlet 421, and the radiator 44 is located at the air outlet 421. When the centrifugal fan 42 is in operation, the rotor 423 generates a cooling airflow 46 to forcibly dissipate the heat sink 44. Heat sink fins in the above radiator 44 due to process and cost
S 6 1321984 片442只能設計成規則之幾何形狀，面積有限，散熱 整體性能不理想，同時各散熱鰭片442之間還需借助 設置扣合結構相互組裝，使得製造成本較高。 另外，上述散熱裝置40之離心風扇42内之空氣受 轉子423之旋轉擠壓和殼體422之流體導向作用影 響，其流場分布和出風口流量分布並不均勻。一般冷 却氣流46上游461處之流量及流速比下游462大，故上 游461處爲重要之熱交換區域，而均勻排列之散熱鰭 片442排布形式較單一，並不能充分利用冷却氣流46 上游461處之熱交換區域。顯然，相對於離心風扇之 流場分布和流量而言，習知之鰭片式散熱器之設計並 不合理。 【發明内容】 有鑒於此，有必要提供一種散熱面積較大且成本 較低之散熱裝置。 在另一方面，也有必要同時提供一種可以充分利 用冷却氣流熱交換區域之散熱裝置。 一種散熱裝置，包括離心風扇及散熱體，該離心 風扇用於産生冷却氣流對該散熱體進行强制散熱，該 離心風扇設有至少一出風口，且該離心風扇内具有導 引冷却氣流之一流道，該散熱體由發泡金屬製成三維 多孔網狀結構並跨設在所述出風口處。 作爲對上述散熱裝置之改進，該散熱體設置成不 規則形狀且至少有一部分位於離心風扇之流道内。 7 1321984 作爲對上述散熱裝置之另一改進，該散熱體收容 在該出風口内且該散熱體靠近冷却氣流上游之一端 向内凸伸形成凸伸部。 作爲對上述散熱裝置之又一改進，該散熱體呈連 續之弧形結構，其包括内邊及兩個相互垂直之外邊， 該内邊呈圓弧狀，該兩外邊之間藉由缺口過渡。 作爲對上述散熱裝置之又一改進，該散熱體呈 “门”形結構，該離心風扇之轉子被該散熱體包圍。 作爲對上述散熱裝置之又一改進，該散熱體爲連 續彎折之弧形結構，包括内邊與外邊，該内邊與外邊 均呈圓孤形。 作爲對上述散熱裝置之又一改進，該散熱體整體 爲環形結構並分布於離心風扇之整個流道上，該離心 風扇之轉子被該散熱體包圍。 作爲對上述散熱裝置之又一改進，該散熱體之内 部孔徑對應該冷却氣流之上、下游分別設有緻密段及 疏鬆段，該緻密段之孔徑小於疏鬆段之孔徑。 與習知技術相比，該散熱體由發泡金屬製成相互 連通之三維網狀多孔結構，散熱面積較大，具有較高 之熱交換係數。同時，發泡金屬散熱體可配合離心風 扇出風口之形狀及内部空間條件設置成規則或不規 則形狀，充分利用冷却氣流之流量及流速之變化來進 行散熱，流場分布合理，從而可以提高整體之散熱效 果，使得該散熱裝置具有散熱效率較高之優點。 8 1321984 【實施方式】 下面參照附圖，結合實施例作進一步說明。 圖1所示爲本發明散熱裝置第一實施例之立體分 解圖，該散熱裝置100包括一散熱體10及一離心風扇 20。該散熱體10與一發熱電子元件（圖未示）熱連接， 該離心風扇20用於對該散熱體10進行强制散熱。 在本實施例中，該散熱體10爲等高塊狀結構，其 由發泡金屬製成相互連通之三維多孔網狀結構，從而 使該散熱體10具有通風及超大比表面積之特點。同 時，該散熱體10還具有易於製造之優點，製造該散熱 體10之發泡金屬可採用業界常用之方法，如電鑄法、 鑄造法等製成。另外，發泡金屬還易於製成各種複雜 之形狀，使該散熱體10可配合離心風扇20本身之結構 特點進行合理之排布，以充分利用離心風扇20之熱交 換區域，此點在後文之實施例中將詳細叙述。 該離心風扇20包括一殼體22、一定子（圖未示）及 一轉子24，該定子及轉子24安裝在該殼體22内，該轉 子24包括複數扇葉242。 該殼體22包括一上蓋222、一底蓋224及一側壁 226。該側壁226爲一 “U”型結構，並與該底蓋224及 上蓋222組成一具有長方形出風口 221之半封閉結 構。其中，該側壁226在出風口221處之高度高於其它 地方側壁226之高度，以便收容該散熱體10。 請參照圖2，該定子及該轉子24偏心地安裝在該 9 1321984 殼體22内，該等扇葉242之最外端與該側壁226之間間 隔一定距離形成一弧形之流道223。爲提兩轉子24産 生之冷却氣流30之流速，在沿逆時針方向即該冷却氣 流30之流動方向上’該流道逐漸變寬。在該流道 223最寬處，該轉子24之扇葉242與該侧壁226之間形 成一流道出口 223a，在與該流道出口 223a相對之另一 側，該側壁226於靠近出風口 221之位置向轉子24突伸 設有一呈三角形之舌口 227 ’該舌口 227可對進入流道 223内之冷却氣流30進行加麼。 請參照圖1至圖3，該散熱體10對應該轉子24設置 於該殼體22之出風口 221内’且該殼體22之上蓋222及 底蓋224緊貼於該散熱體1〇之上下端面’與該散熱體 ίο配合以供冷却氣流通過。在本實施例中，該散熱 體10設置成不規則形狀’其對應冷却氣流30流速及流 量較高之流道出口 2233處（即冷却氣流30之上游）向内 凸伸形成一凸伸部12，從而具有較大之寬度。同時， 該散熱體1 〇對應流速較低之舌口 227處（即冷却氣流3 〇 之下游）具有較小之寬度，即散熱體10之寬度對應冷却 氣流30之流速成反比設置’以適應整個流場之需要， 充分利用冷却氣流3〇上游之熱交換區域進行散熱。 由於該散熱體由發泡金屬製成，具有三維多孔 網狀結構，在冷却氣流3〇流過時’可以更多地增加空 氣擾動，將習知技術中散熱鰭片邊界之層流換熱改變 爲湍流換熱，從而提升熱交換係數。同時，發泡金屬S 6 1321984 The sheet 442 can only be designed into a regular geometric shape, the area is limited, and the overall heat dissipation performance is not ideal, and the heat dissipation fins 442 need to be assembled with each other by means of a fastening structure, so that the manufacturing cost is high. In addition, the air in the centrifugal fan 42 of the heat dissipating device 40 is affected by the rotary pressing of the rotor 423 and the fluid guiding action of the casing 422, and the flow field distribution and the air outlet flow distribution are not uniform. Generally, the flow rate and flow rate at the upstream portion 461 of the cooling airflow 46 are larger than the downstream 462, so the upstream 461 is an important heat exchange region, and the uniformly arranged heat radiating fins 442 are arranged in a single form, and cannot fully utilize the cooling airflow 46. The heat exchange area. Obviously, the design of the conventional finned heat sink is not reasonable relative to the flow field distribution and flow rate of the centrifugal fan. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a heat sink having a large heat dissipation area and a low cost. On the other hand, it is also necessary to provide a heat sink that can fully utilize the cooling airflow heat exchange area. A heat dissipating device includes a centrifugal fan and a heat dissipating body, wherein the centrifugal fan is configured to generate a cooling airflow for forcibly dissipating heat, the centrifugal fan is provided with at least one air outlet, and the centrifugal fan has a flow path for guiding the cooling airflow The heat dissipating body is made of a foamed metal and has a three-dimensional porous network structure and is disposed across the air outlet. As an improvement to the above heat dissipating device, the heat dissipating body is disposed in an irregular shape and at least a portion is located in the flow path of the centrifugal fan. 7 1321984 As another improvement to the heat dissipating device, the heat dissipating body is received in the air outlet and the heat dissipating body protrudes inwardly from one end of the cooling airflow to form a protruding portion. As a further improvement of the above heat dissipating device, the heat dissipating body has a continuous curved structure including an inner side and two mutually perpendicular outer sides, the inner side being arc-shaped, and the outer edges are transitioned by a notch. As a further improvement of the above heat dissipating device, the heat dissipating body has a "gate" structure, and the rotor of the centrifugal fan is surrounded by the heat dissipating body. As a further improvement to the above heat dissipating device, the heat dissipating body is a continuously bent arc structure including an inner side and an outer side, and the inner side and the outer side are rounded. As a further improvement of the above heat dissipating device, the heat dissipating body is entirely annular and distributed over the entire flow path of the centrifugal fan, and the rotor of the centrifugal fan is surrounded by the heat radiating body. As a further improvement of the heat dissipating device, the inner diameter of the heat dissipating body is respectively provided with a dense section and a loose section above and below the cooling airflow, and the diameter of the dense section is smaller than the aperture of the loose section. Compared with the prior art, the heat dissipating body is made of a foamed metal and is connected to a three-dimensional network porous structure, which has a large heat dissipation area and a high heat exchange coefficient. At the same time, the foamed metal heat sink can be set to a regular or irregular shape in accordance with the shape of the air outlet of the centrifugal fan and the internal space condition, and the heat flow and the flow velocity can be fully utilized for heat dissipation, and the flow field distribution is reasonable, thereby improving the overall The heat dissipation effect makes the heat dissipation device have the advantages of high heat dissipation efficiency. 8 1321984 [Embodiment] Hereinafter, the embodiments will be further described with reference to the accompanying drawings. 1 is a perspective exploded view of a first embodiment of a heat sink according to the present invention. The heat sink 100 includes a heat sink 10 and a centrifugal fan 20. The heat sink 10 is thermally connected to a heat generating electronic component (not shown) for forcibly dissipating heat from the heat sink 10. In the present embodiment, the heat dissipating body 10 is of a contoured block structure which is made of a foamed metal and is connected to each other in a three-dimensional porous network structure, so that the heat dissipating body 10 has the characteristics of ventilation and large specific surface area. At the same time, the heat dissipating body 10 has an advantage of being easy to manufacture, and the foamed metal for manufacturing the heat dissipating body 10 can be produced by a method commonly used in the industry, such as electroforming, casting, or the like. In addition, the foamed metal is also easy to be formed into various complicated shapes, so that the heat dissipating body 10 can be properly arranged in accordance with the structural characteristics of the centrifugal fan 20 itself, so as to fully utilize the heat exchange area of the centrifugal fan 20, which will be described later. This will be described in detail in the examples. The centrifugal fan 20 includes a housing 22, a stator (not shown), and a rotor 24, the stator and rotor 24 being mounted within the housing 22, the rotor 24 including a plurality of blades 242. The housing 22 includes an upper cover 222, a bottom cover 224 and a side wall 226. The side wall 226 has a U-shaped structure and forms a semi-closed structure with a rectangular air outlet 221 with the bottom cover 224 and the upper cover 222. The height of the side wall 226 at the air outlet 221 is higher than the height of the other side wall 226 to accommodate the heat sink 10. Referring to FIG. 2, the stator and the rotor 24 are eccentrically mounted in the casing 12 of the 91321984. The outermost ends of the blades 242 and the side walls 226 form a curved flow passage 223 at a certain distance. In order to increase the flow rate of the cooling air flow 30 generated by the two rotors 24, the flow path gradually widens in the counterclockwise direction, i.e., in the flow direction of the cooling air flow 30. At the widest point of the flow path 223, a fan-shaped outlet 223a is formed between the blade 242 of the rotor 24 and the side wall 226, and the side wall 226 is adjacent to the air outlet 221 on the other side opposite to the flow path outlet 223a. Positioned toward the rotor 24 is a triangular tongue 227 which allows for the addition of cooling airflow 30 into the flow passage 223. Referring to FIG. 1 to FIG. 3, the heat dissipating body 10 is disposed in the air outlet 221 of the casing 22 corresponding to the rotor 24, and the upper cover 222 and the bottom cover 224 of the casing 22 are in close contact with the heat dissipating body 1 The end face ' cooperates with the heat sink ίο for the cooling airflow to pass. In this embodiment, the heat dissipating body 10 is disposed in an irregular shape. The flow path outlet 2233 corresponding to the flow rate and the flow rate of the cooling air flow 30 is protruded inwardly (ie, upstream of the cooling air flow 30) to form a protruding portion 12. , thus having a larger width. At the same time, the heat dissipating body 1 〇 corresponds to the lower flow velocity of the tongue 227 (ie, downstream of the cooling airflow 3 )) has a smaller width, that is, the width of the heat dissipating body 10 corresponds to the flow velocity of the cooling airflow 30 is inversely set to 'fit to the whole For the needs of the flow field, make full use of the heat exchange area upstream of the cooling airflow 3 to dissipate heat. Since the heat dissipating body is made of foamed metal and has a three-dimensional porous network structure, when the cooling airflow 3 flows, the air disturbance can be increased more, and the laminar heat transfer at the boundary of the heat radiating fin in the prior art is changed to Turbulent heat transfer, thereby increasing the heat exchange coefficient. At the same time, foamed metal
10 1321984 之三維網狀結構可在有限之空間内極大地增加換熱 表面積，提升換熱量。另外，該散熱體10之寬度對應 冷却氣流30之流速成反比設置，可有效利用空間和冷 却氣流30之流速及流量之變化來進行散熱，從而可以 提高散熱裝置100整體之散熱效果。 請參照圖4，其所示爲本發明散熱裝置第二實施 例之俯視圖，其與第一實施例之不同之處在於：該散 熱體10a具有兩段式結構，其對應冷却氣流30流速較高 之流道出口 223a處具有較小之孔徑，形成一緻密段 101 ;而對應流速較低之舌口 227處具有較大之孔徑， 形成一疏鬆段102，以配合冷却氣流30流場不均勻之 特性。藉由該緻密段101與疏鬆段102之設置，可以在 有效地提高該散熱體10a之散熱面積之同時，充分利用 冷却氣流30來提升散熱效果，從而提高該散熱體10a 之散熱效率。當然，除了設置成多段式結構，該散熱 體10a之内部孔徑亦可設置爲從冷却氣流30上游向下 游逐漸增大之形式。 請參照圖5，其所示爲本發明散熱裝置第三實施 例之俯視圖，其與第一實施例之不同之處在於：該側 壁226a爲一弧形結構，其與該上蓋(；圖未示）及底蓋 224a組成一具有弧形出風口221a之半封閉結構。該散 熱體10b由發泡金屬製成不規則形狀，其於靠近該轉 子24之一側形成一呈圓弧狀之内邊13，於遠離該轉子 24之一側形成兩相互垂直之外邊15、17，該兩外邊 11 1321984 15、17之間藉由一缺口 19過渡。藉由該兩外邊15、17 及缺口 19之設置，使得該散熱體10b形成雙出風口結 構。同時，該散熱體10b向冷却氣流30流速較高之流 道出口 223a處凸伸形成一凸伸部12b。本實施例中，散 熱體10b可以配合出風口 221a設置成不規則形狀，排布 方式靈活，可充分利用出風口221a處之熱交換區域， 相比傳統規則排布之鰭片而言，空間利用率大大提 高。 請參照圖6，其所示爲本發明第四實施例之俯視 圖，其與第三實施例之不同之處在於：該散熱體l〇c 大致呈“门”形結構，並包圍該轉子24a，使得該散熱 體10c在左侧、右侧、上側形成三出風口結構。本實施 例中，散熱體l〇c亦形成不規則形狀，該“门”形結構 增大了該散熱體l〇c之散熱面積，並充分利用出風口處 之散熱空間，從而提高整體之散熱效率。 請參照圖7，其所示爲本發明第五實施例之俯視 圖，其與第一實施例之不同之處在於：該側壁226b爲 一弧形結構，其與上蓋（圖未示）及底蓋224b組成一具 有弧形出風口 221b之半封閉結構，該散熱體10d對應 該出風口 221b呈弧形不規則形狀設置，該散熱體10d 包括一内邊13a與一外邊15a，該内邊13a與外邊15a均 呈圓弧形。該散熱體10d之一端形成一凸伸部12d並伸 入該流道出口 223a内，以充分利用該流道出口 223a處 冷却氣流30較高之流速進行散熱。 12 1321984 請參照圖8，其所示爲本發明第六實施例之俯視 圖，其與第五實施例之不同之處在於：該散熱體l〇e 貫穿該流道223，並呈環形包圍該轉子24。該散熱體 10e與該側壁226c相貼接，以使該散熱體10e與轉子24 之間留有適當間隙，使該側壁226c引導冷却氣流30。 由於該散熱體l〇e由發泡金屬製成，故其在該流道223 内不會阻礙冷却氣流30之流動。該環形結構極大地增 加了該散熱體l〇e之散熱面積，從而提升該散熱體10e 之散熱效率。 由以上可知，該等散熱體10、10a、10b、10c、10d、 10 e由發泡金屬製成三維網狀結構，可以有效地提升其 自身之熱交換係數。由於發泡金屬易於製造，且同時 方便製成各種不同之形狀，該等散熱體10、l〇a、10b、 10c、10d、10e可以根據離心風扇20内之空間條件及離 心風扇20産生流場設計成如圓弧狀、雙出風口型、 “门”形及環形等各種不同之形狀，以降低流阻，增 大散熱面積，充分利用熱交換區域，從而提高散熱效 率。 綜上所述，本發明符合發明專利要件，爰依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施 例，舉凡熟悉本案技藝之人士，在爰依本發明精神所 作之等效修飾或變化，皆應涵蓋於以下之申請專利範 圍内。The three-dimensional network of 10 1321984 greatly increases the heat transfer surface area and increases the heat transfer in a limited space. In addition, the width of the heat dissipating body 10 is inversely proportional to the flow rate of the cooling airflow 30, and the heat dissipation of the space and the flow rate of the cooling airflow 30 can be effectively utilized, thereby improving the heat dissipation effect of the heat dissipating device 100 as a whole. Referring to FIG. 4, there is shown a plan view of a second embodiment of the heat sink according to the present invention, which is different from the first embodiment in that the heat sink 10a has a two-stage structure, and the flow rate corresponding to the cooling airflow 30 is relatively high. The flow passage outlet 223a has a smaller aperture to form a uniform dense section 101; and the corresponding lower flow velocity of the tongue opening 227 has a larger aperture to form a loose section 102 to match the cooling airflow 30 with a non-uniform flow field. characteristic. By the arrangement of the dense section 101 and the loose section 102, the heat dissipation area of the heat sink 10a can be effectively increased, and the cooling airflow 30 can be fully utilized to enhance the heat dissipation effect, thereby improving the heat dissipation efficiency of the heat sink 10a. Of course, in addition to being arranged in a multi-stage configuration, the internal aperture of the heat sink 10a can also be arranged to gradually increase from the upstream of the cooling airflow 30. Please refer to FIG. 5, which is a top view of a third embodiment of the heat sink of the present invention, which is different from the first embodiment in that the side wall 226a is an arc-shaped structure and the upper cover (the figure is not shown) And the bottom cover 224a constitutes a semi-closed structure having a curved air outlet 221a. The heat dissipating body 10b is formed in an irregular shape by a foamed metal, and forms an arc-shaped inner edge 13 on one side of the rotor 24, and two mutually perpendicular outer edges 15 on one side away from the rotor 24. 17. The two outer edges 11 1321984 15 and 17 are transitioned by a gap 19. The heat dissipating body 10b forms a double air outlet structure by the arrangement of the two outer edges 15, 17 and the notch 19. At the same time, the heat radiating body 10b protrudes toward the flow path outlet 223a where the flow velocity of the cooling air flow 30 is high to form a convex portion 12b. In this embodiment, the heat dissipating body 10b can be arranged in an irregular shape in cooperation with the air outlet 221a, and the arrangement manner is flexible, and the heat exchange area at the air outlet 221a can be fully utilized, and the space utilization is compared with the conventionally arranged fins. The rate has been greatly improved. Referring to FIG. 6, there is shown a plan view of a fourth embodiment of the present invention, which is different from the third embodiment in that the heat dissipating body 10c has a substantially "door" shape and surrounds the rotor 24a. The heat dissipating body 10c is formed with a three air outlet structure on the left side, the right side, and the upper side. In this embodiment, the heat dissipating body 10c also forms an irregular shape, and the "door" structure increases the heat dissipating area of the heat dissipating body l〇c, and fully utilizes the heat dissipating space at the air outlet, thereby improving the overall heat dissipation. effectiveness. Please refer to FIG. 7, which is a top view of a fifth embodiment of the present invention, which is different from the first embodiment in that the side wall 226b is an arc-shaped structure, which is combined with an upper cover (not shown) and a bottom cover. 224b constitutes a semi-closed structure having a curved air outlet 221b. The heat dissipating body 10d is disposed in an arc-shaped irregular shape corresponding to the air outlet 221b. The heat dissipating body 10d includes an inner side 13a and an outer side 15a, and the inner side 13a and The outer edges 15a are all in a circular arc shape. One end of the heat radiating body 10d forms a convex portion 12d and extends into the flow path outlet 223a to fully utilize the flow rate of the cooling air current 30 at the flow path outlet 223a to dissipate heat. 12 1321984 Please refer to FIG. 8 , which is a top view of a sixth embodiment of the present invention, which is different from the fifth embodiment in that the heat dissipating body 10 贯穿e extends through the flow path 223 and surrounds the rotor in an annular shape. twenty four. The heat sink 10e is attached to the side wall 226c such that a proper gap is left between the heat sink 10e and the rotor 24, so that the side wall 226c guides the cooling airflow 30. Since the heat radiating body 10e is made of a foamed metal, it does not hinder the flow of the cooling airflow 30 in the flow path 223. The annular structure greatly increases the heat dissipation area of the heat sink l〇e, thereby improving the heat dissipation efficiency of the heat sink 10e. As apparent from the above, the heat dissipating bodies 10, 10a, 10b, 10c, 10d, and 10e are formed of a three-dimensional network structure of a foamed metal, and the heat exchange coefficient of the heat dissipating body can be effectively improved. Since the foamed metal is easy to manufacture and at the same time convenient to be formed into various shapes, the heat radiating bodies 10, 10a, 10b, 10c, 10d, 10e can generate a flow field according to the space condition in the centrifugal fan 20 and the centrifugal fan 20. It is designed into various shapes such as arc shape, double air outlet type, "door" shape and ring shape to reduce flow resistance, increase heat dissipation area, and make full use of heat exchange area, thereby improving heat dissipation efficiency. In summary, the present invention complies with the requirements of the invention patent, and proposes a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims.
S 13 1321984 【圖式簡單說明】 圖1爲本發明散熱裝置第一實施例之立體分解 圖。 圖2爲圖1所示散熱裝置去掉上蓋後之俯視圖。 圖3爲圖1所示散熱裝置之立體組合圖。 圖4爲本發明散熱裝置第二實施例之俯視圖。 圖5爲本發明散熱裝置第三實施例之俯視圖。 圖6爲本發明散熱裝置第四實施例之俯視圖。 圖7爲本發明散熱裝置第五實施例之俯視圖。 圖8爲本發明散熱裝置第六實施例之俯視圖。 圖9爲習知散熱裝置之俯視圖。 【主要元件符號說明】 <本發明> 散熱裝置 100 散熱體 10 、 10a 、 10b 、 10c 、 10d 、 10e 緻密段 101 疏鬆段 102 凸伸部 12、12b、12d 内邊 13 、 13a 外邊 15 、 15a 、 17 缺口 19 殼體 22 離心風扇 20 出風口 221 、 221a 、221b 上蓋 222 流道 223 流道出口 223a 舌口 227 底蓋 224 ' 224a 、224b 14 1321984 側壁 226 、 226a 、226b 、 226c 轉子 冷卻氣流 24、24a 30 扇葉 242 〈習知技術〉 散熱裝置 40 離心風扇 42 流道出口 421 殼體 422 轉子 423 散熱器 44 散熱鰭片 442 冷卻氣流 46 上游 461 下游 462 15S 13 1321984 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective exploded view of a first embodiment of a heat sink according to the present invention. 2 is a top plan view of the heat sink of FIG. 1 with the upper cover removed. 3 is a perspective assembled view of the heat sink shown in FIG. 1. 4 is a top plan view of a second embodiment of a heat sink of the present invention. Figure 5 is a plan view of a third embodiment of the heat sink of the present invention. Figure 6 is a plan view of a fourth embodiment of the heat sink of the present invention. Figure 7 is a plan view of a fifth embodiment of the heat sink of the present invention. Figure 8 is a plan view of a sixth embodiment of the heat sink of the present invention. Figure 9 is a top plan view of a conventional heat sink. [Description of main component symbols] <The present invention> Heat dissipating device 100 heat dissipating bodies 10, 10a, 10b, 10c, 10d, 10e dense section 101 loose section 102 convex portions 12, 12b, 12d inner side 13 and 13a outer side 15 15a, 17 notch 19 housing 22 centrifugal fan 20 air outlet 221, 221a, 221b upper cover 222 flow path 223 flow path outlet 223a tongue port 227 bottom cover 224 ' 224a, 224b 14 1321984 side wall 226, 226a, 226b, 226c rotor cooling airflow 24, 24a 30 Fan 242 <Practical Technology> Heat sink 40 Centrifugal fan 42 Runner outlet 421 Housing 422 Rotor 423 Radiator 44 Heat sink fin 442 Cooling airflow 46 Upstream 461 Downstream 462 15