201138274 六、發明說明： 【發明所屬之技術領域】 陳)1] 本發明涉及一種離心風扇’特別涉及一種用於電子元件 散熱的離心風扇。 【先前技術】 [0002] 目前在電腦内，常採用由導熱體、熱管、散熱片組及離 心風扇組成的散熱模組對電子元件散熱。導熱體貼設於 電子元件上吸收電子元件的熱量’熱管將導熱體吸收的 熱量傳遞給散熱片組，離心風扇產生的氣流吹拂散熱片 並與散熱片發生熱交換以最終將熱量散發出去。因此， 散熱模組對保證電子元件的正常工作起著極為重要的作 用。 [0003] 圖4所示為一習知離心風扇900，該習知離心風扇900包括 一渦殼92及收容於該渦殻92内的一葉輪94。該渦殼92的 一端形成一出風口 920。該渴殼92的外周形成一彎曲段 ;..... ； ；. 922。該彎曲段922呈阿基米德螵線或對數螺線延伸。在 圖4所示的座標中，該彎曲段922自第II項限延伸至0°座 標線處。該渦殼92内對應第III項限處形成一拐角區924 。該習知離心風扇900工作時，葉輪94旋轉驅動氣流在渦 殼92内運動至出風口 920。然而，申請人利用 CFD(Computational Fluid Dynamics,計算流體力 學）軟體對該習知離心風扇900進行流場模擬分析發現’ 該習知離心風扇900工作時，其拐角區924内的氣流阻滞 ，形成一高壓死區，該拐角區924内的氣流不能被順暢地 引導至出風口 920，從而使習知離心風扇900的風量受到 099112442 表單編號A0101 0992022048-0 201138274 [0004] 限制。 【發明内容】 繁於此，有必要提供—種可⑷肖除高壓死區從而提供 大風量的離心風扇。 、 更 [0005] η [0006] Ο [0007] -種離心風扇’包括-扇框及枚容於該扇框内的〜 ，該扇框内於該葉輪的外圍形成一流道，該扇框的1 形成-出風口，該扇框的外周形成—起始彎錢及與側 起始弯曲段連接的-擴張彎曲段，沿葉輪的旋轉方= ，該擴張料独㈣起_職方，該起如變j 段以阿基米德螺線或對數螺線延伸，該擴料曲曲 該起始料段沿阿基米德螺線或對數職延伸的於 的外侧，該扇_設有1叫，料錄從= 延伸至流道内，該導流板將'^處 。 Μ所錢道分關二氡 一種離心風扇，包括一扇栖 ]汇及收容於該扇框内的〜 ，該扇框的一侧設有一出屈 萊輪 圍形成-流道，該扇框内靠1該扇框内於該葉輪的外 角區，該練内設有1·，該導流板自 伸至該扇框的拐角區，謗邋法 風延 m , 將所述流道分隔成一第 一氣流通道和一第二氣流通道。 該離心風扇的扇框於擴張響 $典奴處的曲率較習知離心風 扇的更小，使擴張彎曲段處的流阻降低，使離心風扇内 的拐角區内的氣流被順鴨地引導至出風口，防土在扇框 内形成Μ死區，增大離心風扇的風量。 099112442 表單編號Α0101 第5頁/共 17頁 0992022048-° 201138274 【實施方式】 [0008] 請一併參閱圖1及圖2。該離心風扇1 00包括一扇框1 0及收 容於該扇框10内的一葉輪20。該葉輪20包括一輪轂22及 自輪轂22外圍呈放射狀向外延伸的複數扇葉24。該扇框 10包括一頂板12、與該頂板12相對的一底板14、及連接 於頂板12與底板14之間的一渦形側壁16。該頂板12、底 板14及側壁16合圍形成一容置空間，該葉輪20收容於該 容置空間内。 [0009] 該頂板12的中央形成一進風口 120。該葉輪20可轉動地設 於該底板14上並與該進風口 120正對。該侧壁16垂直環繞 於該底板14的外周緣。本實施例中，該側壁16與底板14 一體形成。當然，該侧壁16也可與底板14分別成型後再 連接在一起。該側壁16的一端形成一出風口 160。 [0010] 沿葉輪20的旋轉方向上，該側壁16包括一第一平直段161 、連接於該第一平直段161末端的一起始彎曲段162、連 接於該起始彎曲段162末端的一擴張彎曲段163，及連接 於該擴張彎曲段163末端的一第二平直段164。該第一、 第二平直段161、164均呈平板狀且相對平行設置。該第 一、第二平直段161、164的末端相平齊。該第一、第二 平直段161、164之間形成所述出風口 160。 [0011] 該側壁16環繞於該葉輪20的外圍，該葉輪20的扇葉24的 末端與該侧壁1 6之間間隔形成一可供氣流運行的一渦形 流道17。該流道17的寬度從起始彎曲段162到擴張彎曲段 16 3逐漸增大。 [0012] 該底板1 4上還設有一導流板1 5。該導流板1 5呈片狀，自 099112442 表單編號 A0101 第 6 頁/共 17 頁 0992022048-0 201138274 該底板14垂直向上延伸而成。該導流板15可與底板14一 體成型’也可單獨成型後再通過其他方式固定於底板14 上。該導流板15自出風口 160延伸至扇框10内的流道17 的中部。該導流板15位於該侧壁16與葉輪20之間，並與 側壁16、葉輪2 0相互間隔。 [0013] ❹ 請一併參閱圖3，該側壁16的起始彎曲段162自第一平直 段161的末端呈阿基米德螺線延伸至180。座標線處。可以 理解地，該起始彎曲段162也可以呈對數螺線的形式延伸 。該擴張彎曲段163自180°座標線處延伸至0°座標線處 ’即該擴張彎曲段163位於該座標的第III、IV項限内。 該離心風扇100的流道17對應第in項限處形成一拐角區 174，即該拐角區174位於該扇框10内靠近該流道Π的中 部區域。 [0014] 圖3中虛線表示了起始彎曲段162的延長線，也即習知離 心風扇900的渦殼92的彎曲段022 由圖3可以看出 該 擴張彎曲段163相對該葉輪20位於該起始彎曲段1 62沿阿 卜： Ο 基米德螺線或對數螺線延伸的延長線的外側，且沿葉輪 20的旋轉方向上’該擴張彎曲段163與起始f曲段162沿 阿基未德螺線或對數螺線延伸的延長線之間的距離逐漸 增大。因此，該擴張彎曲段163相較習知離心風扇900的 渦殼92的彎曲段922相應部分的曲率更小。該離心風扇 100於擴張彎曲段163處的流道17較習知離心風扇900更 寬。 該導流板15包括一内端151及一外端152，該内端151自 270 °座標線處呈彎曲狀延伸至0°座標線處，該導流板15 099112442 表單編號A0101 第7頁/共17頁 0992022048-0 [⑻ 15] 201138274 的外端152呈直線形延伸至出風口 16〇處。該導流板15的 外端152與該第二平直段164平行，且該導流板15的外端 152延伸至靠近出風口 16〇的中部位置處。從圖3可以看出 ，該導流板15的内端1 51位於該側壁1 6的起始彎曲段丨6 2 的延長線上，即朝著起始彎曲段162的延伸方向延伸。該 導流板15自270。座標線處將流道丨7分隔成一第一氣流通 道171及一第二氣流通道172。該第一氣流通道171介於 該葉輪20與該導流板15之間；該第二氣流通道172介於該 導流板15與該侧壁16之間。該侧壁16的擴張彎曲段163 處所對應的第一氣流通道17l·和第二氯流通道172的寬度 沿氣流行進方向上逐漸增大「 [0016] 在該實施例中，離心風扇100的擴張彎曲段163較習知離 心風扇900的渦殼92的彎曲段922相應部分的曲率更小， 因此氣流在拐角區174處的流阻降低，使得拐角區174内 的氣流可以被順暢地引導至出風口 16 0處，從而防止氣流 在拐角區174内阻滯形成高壓死區，使離心風扇丄〇〇的風 量得到提升。同時，導流板卟將氣流分成兩部分分別從 第一氣流通道171和第二氣流通道172排向出風口 16〇。 第—氣流通道171内的氣流被導流板15的内端151加壓， 第二氣流通道172内的氣流被側壁16的擴張彎曲段163加 壓。從而使流向出風口 160處的氣流的風壓增大，從而保 證出風口 160處氣流的流速◊此外，導流板15的外端152 與第二平直段164平行且延伸至靠近出風口 16〇的中部位 置處’可以將第一氣流通道1 71内的氣流以與第二平直段 164平行的方向自靠近出風口 160的中部位置處導出，使 099112442 表單編號A0101 第8頁/共17頁 0992022048-0 201138274 得該出風口 160處的氣流分佈更為均句 _]综上所述，本發明符合發料利要件1㈣提出專利 申請。惟’以上所述者料本發明之較佳實施例，舉凡 热悉本案技藝之人士 ’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。 【圖式簡單說明】 [0018] 圖1為本發明離心風扇較佳實施例的立體分解圖。 [0019] 圖2為圖1所示離心風扇的流場示意圖。 Ο [0020]圖3為圖1所示離心風扇的仰視圖。 [0021] 圖4為習知離心風扇的仰視圖。 【主要元件符號說明】 [0022] 扇框：1 〇 [〇〇23] 離心風扇：100 [0024]頂板：12 q [0025]進風口 ： 120 [0026] 底板：14 [0027] 導流板：15 [0028] 内端：151 [0029] 外端：152 [0030] 侧壁：16 [0031] 出風口 ： 160 099112442 表單編號Α0101 第9賓/共17頁 〇992〇22〇48-〇 201138274 [0032] 第一平直段： 161 [0033] 起始彎曲段： 162 [0034] 擴張彎曲段： 163 [0035] 第二平直段： 164 [0036] 流道：17 [0037] 第一氣流通道 ：171 [0038] 第二氣流通道 ：172 [0039] 拐角區.1 7 4 [0040] 葉輪：20 [0041] 輪毅.2 2 [0042] 扇葉：24 [0043] 習知離心風扇 ：900 [0044] 渦殼：92 [0045] 出風口 ： 920 [0046] 彎曲段：922 [0047] 拐角區· 9 2 4 [0048] 葉輪：94 099112442 表單編號A0101 第10頁/共17頁 0992022048-0201138274 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a centrifugal fan', and more particularly to a centrifugal fan for heat dissipation of electronic components. [Prior Art] [0002] At present, in a computer, a heat dissipation module composed of a heat conductor, a heat pipe, a heat sink group, and a centrifugal fan is often used to dissipate heat from the electronic components. The heat conductor is attached to the electronic component to absorb the heat of the electronic component. The heat pipe transfers the heat absorbed by the heat conductor to the heat sink group, and the airflow generated by the centrifugal fan blows the heat sink and exchanges heat with the heat sink to finally dissipate the heat. Therefore, the heat dissipation module plays an extremely important role in ensuring the normal operation of the electronic components. 4 shows a conventional centrifugal fan 900. The conventional centrifugal fan 900 includes a scroll 92 and an impeller 94 received in the scroll 92. One end of the scroll 92 forms an air outlet 920. The outer circumference of the thirsty shell 92 forms a curved section; ..; ;; 922. The curved section 922 extends in an Archimedean line or a logarithmic spiral. In the coordinates shown in Figure 4, the curved section 922 extends from the second term to the 0° coordinate line. A corner region 924 is formed in the volute 92 corresponding to the third term. When the conventional centrifugal fan 900 is in operation, the impeller 94 rotationally drives the airflow to move within the volute 92 to the air outlet 920. However, the applicant uses the CFD (Computational Fluid Dynamics) software to perform flow field simulation analysis on the conventional centrifugal fan 900. It is found that the flow of the conventional centrifugal fan 900 is blocked in the corner region 924. In a high pressure dead zone, the airflow in the corner zone 924 cannot be smoothly directed to the air outlet 920, so that the air volume of the conventional centrifugal fan 900 is limited by 099112442 Form No. A0101 0992022048-0 201138274 [0004]. SUMMARY OF THE INVENTION In view of this, it is necessary to provide a centrifugal fan that can (4) remove high-voltage dead zones to provide a large amount of air. [0007] η [0006] Ο [0007] - a centrifugal fan 'includes - a fan frame and a ^ inside the fan frame, the fan frame forming a first-class road in the periphery of the impeller, the frame of the 1 forming-air outlet, the outer circumference of the frame is formed - the initial bending money and the expansion curved section connected with the side starting curved section, along the rotation of the impeller =, the expansion material alone (four) from the staff side, the If the variable j segment is extended by an Archimedes spiral or a logarithmic spiral, the expansion piece is extended to the outer side of the Archimedes spiral or logarithmic position, and the fan has a 1 , the material record extends from = to the flow channel, and the baffle will be '^.离心 钱 钱 氡 氡 氡 氡 氡 氡 氡 氡 氡 氡 氡 氡 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心 离心The fan frame is disposed in the outer corner region of the impeller, and the baffle is self-extended to the corner region of the fan frame, and the air flow path is divided into a first An air flow channel and a second air flow channel. The fan frame of the centrifugal fan has a smaller curvature at the expansion ring than the conventional centrifugal fan, so that the flow resistance at the extended curved portion is lowered, so that the airflow in the corner region of the centrifugal fan is guided to the duck. At the air outlet, the anti-soil forms a dead zone in the fan frame, increasing the air volume of the centrifugal fan. 099112442 Form No. Α0101 Page 5 of 17 0992022048-° 201138274 [Embodiment] [0008] Please refer to FIG. 1 and FIG. 2 together. The centrifugal fan 100 includes a frame 10 and an impeller 20 housed in the frame 10. The impeller 20 includes a hub 22 and a plurality of blades 24 extending radially outward from the periphery of the hub 22. The frame 10 includes a top plate 12, a bottom plate 14 opposite the top plate 12, and a scroll side wall 16 connected between the top plate 12 and the bottom plate 14. The top plate 12, the bottom plate 14 and the side wall 16 are enclosed to form an accommodating space, and the impeller 20 is received in the accommodating space. An air inlet 120 is formed in the center of the top plate 12. The impeller 20 is rotatably disposed on the bottom plate 14 and faces the air inlet 120. The side wall 16 is vertically surrounding the outer periphery of the bottom plate 14. In this embodiment, the side wall 16 is integrally formed with the bottom plate 14. Of course, the side wall 16 can also be formed separately from the bottom plate 14 and then joined together. One end of the side wall 16 defines an air outlet 160. [0010] In the direction of rotation of the impeller 20, the side wall 16 includes a first straight section 161, an initial curved section 162 connected to the end of the first straight section 161, and connected to the end of the initial curved section 162. An expanded curved section 163 and a second straight section 164 connected to the end of the expanded curved section 163. The first and second straight sections 161, 164 are all flat and arranged in parallel. The ends of the first and second straight sections 161, 164 are flush. The air outlet 160 is formed between the first and second straight sections 161, 164. [0011] The side wall 16 surrounds the periphery of the impeller 20, and the end of the blade 24 of the impeller 20 is spaced from the side wall 16 to form a scroll passage 17 for airflow operation. The width of the flow path 17 gradually increases from the initial curved section 162 to the expanded curved section 16 3 . [0012] A bottom plate 14 is further provided with a deflector 15 . The baffle 15 is in the form of a sheet, from 099112442 Form No. A0101 Page 6 of 17 0992022048-0 201138274 The bottom plate 14 extends vertically upwards. The baffle 15 can be integrally formed with the bottom plate 14 or it can be separately formed and then fixed to the bottom plate 14 by other means. The baffle 15 extends from the air outlet 160 to the middle of the flow path 17 in the frame 10. The baffle 15 is located between the side wall 16 and the impeller 20 and is spaced apart from the side wall 16 and the impeller 20. [0013] Referring to FIG. 3 together, the initial curved section 162 of the side wall 16 extends from the end of the first straight section 161 to an Archimedean spiral to 180. At the coordinate line. It will be appreciated that the initial curved section 162 may also extend in the form of a logarithmic spiral. The expanded curved section 163 extends from the 180° coordinate line to the 0° coordinate line, i.e., the expanded curved section 163 is located within the third and fourth limits of the coordinate. The flow path 17 of the centrifugal fan 100 forms a corner area 174 corresponding to the in-th limit, i.e., the corner area 174 is located in the middle portion of the frame 10 adjacent to the flow path. [0014] The dotted line in FIG. 3 indicates the extension of the initial curved section 162, that is, the curved section 022 of the volute 92 of the conventional centrifugal fan 900. It can be seen from FIG. 3 that the expanded curved section 163 is located relative to the impeller 20. The initial curved section 1 62 is along the outer side of the extension line extending from the Abu: Ο Kimidide spiral or the logarithmic spiral, and along the direction of rotation of the impeller 20, the expanded curved section 163 and the initial f-curved section 162 The distance between the Kiwid spiral or the extension of the logarithmic spiral is gradually increased. Therefore, the expanded curved section 163 has a smaller curvature than the corresponding portion of the curved section 922 of the scroll 92 of the conventional centrifugal fan 900. The flow path 17 of the centrifugal fan 100 at the expanded curved section 163 is wider than the conventional centrifugal fan 900. The baffle 15 includes an inner end 151 and an outer end 152 extending from a 270° coordinate line to a 0° coordinate line. The baffle 15 099112442 Form No. A0101 Page 7 / Total 17 pages 0992022048-0 [(8) 15] The outer end 152 of 201138274 extends linearly to the air outlet 16〇. The outer end 152 of the baffle 15 is parallel to the second straight section 164, and the outer end 152 of the baffle 15 extends to a position near the middle of the air outlet 16〇. As can be seen from Figure 3, the inner end 151 of the baffle 15 is located on the extension of the initial curved section 丨6 2 of the side wall 16, i.e., extending toward the direction of extension of the initial curved section 162. The deflector 15 is from 270. The flow path 丨7 is divided into a first air flow path 171 and a second air flow path 172 at the coordinate line. The first air flow passage 171 is interposed between the impeller 20 and the deflector 15; the second air flow passage 172 is interposed between the deflector 15 and the side wall 16. The widths of the first airflow passages 17l and 172 corresponding to the expanded curved section 163 of the side wall 16 gradually increase in the airflow direction. [0016] In this embodiment, the expansion of the centrifugal fan 100 The curved section 163 has a smaller curvature than the corresponding portion of the curved section 922 of the scroll 92 of the conventional centrifugal fan 900, so that the flow resistance of the airflow at the corner area 174 is lowered, so that the airflow in the corner area 174 can be smoothly guided out. The tuyere 16 0, thereby preventing the airflow from blocking in the corner area 174 to form a high pressure dead zone, so that the air volume of the centrifugal fan is increased. At the same time, the deflector 卟 divides the airflow into two parts from the first air flow passage 171 and The second air flow passage 172 is discharged to the air outlet 16. The air flow in the first air flow passage 171 is pressurized by the inner end 151 of the deflector 15, and the air flow in the second air flow passage 172 is pressurized by the expanded curved portion 163 of the side wall 16. Thereby, the wind pressure of the airflow flowing to the air outlet 160 is increased, thereby ensuring the flow velocity of the airflow at the air outlet 160. Further, the outer end 152 of the deflector 15 is parallel to the second straight section 164 and extends close to the air outlet. 16〇 At the middle position, the airflow in the first airflow passage 171 can be derived from the middle position near the air outlet 160 in a direction parallel to the second straight section 164, so that 099112442 Form No. A0101 Page 8 of 17 page 0992022048 -0 201138274 The airflow distribution at the air outlet 160 is more uniform _] In summary, the present invention meets the requirements of the hair supply article 1 (4). However, the above description of the preferred embodiment of the present invention, The equivalent modifications or variations of those skilled in the art of the present invention should be included in the scope of the following patent application. [FIG. 1] FIG. 1 is a perspective view of a centrifugal fan of the present invention. 2 is a perspective view of a flow field of the centrifugal fan shown in Fig. 1. [0020] Fig. 3 is a bottom view of the centrifugal fan shown in Fig. 1. [0021] Fig. 4 is a conventional view Bottom view of the centrifugal fan. [Main component symbol description] [0022] Fan frame: 1 〇 [〇〇23] Centrifugal fan: 100 [0024] Top plate: 12 q [0025] Air inlet: 120 [0026] Base plate: 14 [ 0027] Deflector: 15 [0028] Inner: 151 [0029] End: 152 [0030] Side wall: 16 [0031] Air outlet: 160 099112442 Form number Α 0101 9th / 17 pages 〇 992〇 22〇 48-〇 201138274 [0032] First straight section: 161 [0033] Starting curved section: 162 [0034] Expanding curved section: 163 [0035] Second straight section: 164 [0036] Flow path: 17 [0037] First air flow path: 171 [0038] Second air flow path: 172 [ 0039] Corner area.1 7 4 [0040] Impeller: 20 [0041] Wheel Yi. 2 2 [0042] Fan blade: 24 [0043] Conventional centrifugal fan: 900 [0044] Vortex: 92 [0045] Air outlet : 920 [0046] Bending section: 922 [0047] Corner area · 9 2 4 [0048] Impeller: 94 099112442 Form No. A0101 Page 10 of 17 0992022048-0