1338552 _ 099年11月23日核正替换頁 六、發明說明： 【發明所屬之技術領域】 .1338552 _ November 23, 099 nuclear replacement page VI, invention description: [Technical field to which the invention belongs].
[0001] 本發明涉及一種離心風扇，尤係涉及一種離心風扇之扇 葉結構及採用該扇葉結構之離心風扇。 【先前技術】 [0002] 隨著電腦產業之迅速發展，CPU追求高速度化，高功能化 及小型化所衍生之散熱問題越來越嚴重，這在筆記本電 腦等内部空間狹小之電子裝置中更為突出。如果無法將 筆記本電腦内之CPU等電子元件所產生之熱量及時有效地 散發出去，將極大地影響電子元件之工作性能，同時還 會縮減電子元件之使用壽命，故必須對電子元件進行散 熱。 [0003] 目前在筆記本電腦内，常採用由導熱體、熱管、散熱片 及離心風扇組成之散熱模組對電子元件散熱。導熱體貼 設於電子元件上，導熱體與散熱片藉由熱管連接，離心 風扇產生之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。故，離心風扇在散熱模組中起著極 為重要之作用。離心風扇之流速越快、風量越大，則與 散熱片交換之熱量就更多，從而有效地將電子元件之熱 量散發。然而，目前所使用離心風扇之葉片通常為平板 型葉片，其導流效果不佳而使離心風扇難以產生較高流 速及較大風量，將難以應對在較小空間内有效地對高發 熱量之電子元件進行散熱之需求。 【發明内容】 [0004] 有鑒於此，有必要提供一種能夠產生較高流速及較大風 096123682 表單編號A010] 第3頁/共15頁 0993419170-0 1338552 旦從 099年11月23日核正替换頁 里之〜風扇之扇葉結構及採用該扇葉結構之離心風扇 〇 [0005] ㈣。風扇’包括_扇葉結構，該扇葉結構具有一輪 轂及呈放射狀分佈於輪轂周向之複數葉片，每一葉片具 有迎風面’其中所述每一葉片之寬度沿輪敎之徑向向 外之方向遞減’所述葉片之迎風面為沿葉片之上、下側 緣向葉片之中部逐漸内縮之—凹曲面形狀。 [0006] 赫％風扇之扇葉結構進_步在輪毅之外周面上環設有 一環板’每—葉片具有與該環板之外周面相連接之-連 接端及與該連接端相對之一自由端，_之上表面上 對應每一葉片形成有與葉片才目連之一導流部.:。 [0007] 與習知技術相比，上述離心風扇之扇葉結構中，葉片之 寬度沿輪轂之徑向向外之方向遞減，葉片之迎風面為沿 某片之上、下側緣向葉片之中部逐漸内縮之一凹曲面形 狀，該内縮之凹曲面對氣流有導向作用，該漸縮狀之葉 片可以對沿凹曲面流動之氣流進行壓縮，從而使自葉片 之自由端流出之氣流具較高之流速。另外，在扇葉之輪 轂之外周面環設之環板之上表面對應每一葉片形成有與 葉片相連之導流部，藉由該導流部可以將氣流快迷地導 向葉片，從而加速氣體流動，使離心風扇之流量增加。 【實施方式】 [0008] 圖1所示為本發明離心風扇之扇葉結構10其中一較佳實施 例之立體圖，該扇葉10包括一輪轂n、一環板12、複數 葉片13及複數導流部14。 096123682 表單編珑A0101 第4頁/共15頁 0993419170-0 1338552 __ 099年11月23日按正替換頁 [0009] 該輪毅11具有一頂面111及一外周面112。該環板12環設 於該輪毅11之外周面112上，且位於該外周面112轴向之 中部。該等葉片13呈放射狀均勻分佈於輪轂η之周向並 與環板12之外周面121相連接。每一葉片13具有與環板 12之外周面121相連接之一連接端131及與該連接端131 相對之一自由端132,葉片13之寬度自葉片13之連接端 131向葉片13之自由端132遞減，即葉片13在連接端131 處之寬度要大於其在自由端132處之寬度。請一併參照圖 2及圖3，葉片13在連接端131處之上部133與下部134在 輪轂11之軸向上分別凸出於環板12之上、下表面122、 123，這樣葉片13在連接端131處就能具有一較大寬度。 每一葉片13自其連接端131處之上部:1:33沿輪轂11之徑向 向内延伸’從而在環板12之上表面122形成一導流部14， 且該導流部14之内端與輪轂11之外周面112相連接。 [0010] 如圖4所示，每一葉片13包括一迎風面135及與該迎風面 · ·. 135相對之一背風面136，在扇葉10運轉過程中，葉片1 3 之迎風面135在扇葉10之旋轉方向上位於該背風面136之 » < 前方’其中葉片13之迎風面135為沿葉片13之上、下側緣 向葉片13之中部逐漸内縮之一凹曲面。每一葉片13還包 括連接於迎風面13 5之上側緣與背風面1 3 6之上側緣間之 第一圓弧面137及連接於迎風面135之下側緣與背風面 136之下側緣間之第二圓弧面138。 [0011] 請繼續參閱圖2，與每一葉片13相連接之導流部14亦相應 地具有一迎風面141與一背風面142，其中導流部14之迎 風面141為沿導流部14之上側緣嚮導流部14之下側緣逐漸 096123682 表單編號A0101 第5頁/共15頁 0993419170-0 1338552 099年11月23日修正替換頁 内細之斜面其中該導流部1 4之迎風面1 4 1亦可以為- 弧面每導机! 4還具有連接於迎風面】4】之上側緣與 背風面142之上側緣間之一·面⑷。 [0012] 該扇茱結樣10可設於_離心風扇之扇框中或__環設有散 熱片之散熱座上使用。卫作時，該扇葉1Q結構沿如圖（中 箭頭R所示之方向轉動，導流部14之迎風面141及葉片13 之風面1 3 5在扇葉結構1 〇之旋轉方向上分別位於各自背 風面142、136之前方。該導流部14之迎風面141為一内 縮之斜面，自環板12上方吸入之空氣藉由該導流部14之 迎風面141可以迅速地導向葉片13，從而可以加速氣流流 動，使離心風扇之流量增加、‘葉片】3之邊禽承丨3 5為沿葉 片13之上、下側緣向葉片13之中部逐漸内，之一凹曲面 ，由導流部14導向葉片13之氣流將順著葉片13之迎風面 135沿輪轂11之徑向向外流動。又葉片13之寬度自葉片 13之連接端131向葉片13之自由端132遞減，順著葉片13 迎風面丨35沿輪轂11之徑向向外流動之氣流逐漸被壓縮， 從而使自葉片13之自由端132流出之氣流具較高之流速。 [0013] 與傳統使用乎板形葉片之離心風扇之扇葉結構相比，上 述離心風扇之扇葉結構10中，葉片13之迎風面135為沿葉 片13之上、下侧緣向葉片13之中部逐漸内縮之一凹曲面 ，葉片13之寬度自葉片13之連接端131向葉片13之自由 端132遞減’該内縮之凹曲面對氣流有導向作用，該漸縮 狀之葉片〖3可以使沿凹曲面流動之氣流逐漸被壓縮，從 而使自葉片13之自由端132流出之氣流具較高之流速。另 外’在扇葉10之輪轂11之外周面112環設有環板12，並 096123682 表單編號A0101 第6頁/共15頁 0993419丨70-0 1338552 I ·* 099年11月23日 在環板12之上表面122形成有與葉片13相連之導流部14 ’藉由該導流部14可以將，氣流快速地導向葉片i 3，從而 加速氣體流動，使離、心風扇之流量增加。藉由該環板j 2 及導流部14之設置，還可以使葉片13之連接強度增加， 以保證葉片13不會因太高之轉速而被折斷。 [0014] 在上述實施例中’導流部14僅僅設置在環板12之上表面 122上，可以理解地，上述離心風扇之扇葉結構1〇亦可以 設於具上、下雙進風口之離心風扇之扇框中。此種情況 下，環板12之下表面123上亦可以對應每—葉片13形成另 一導流部，即在環板12之上、下表面122、i23上分別形 成上下對稱之兩個導流部，該另一導流部可將自環板12 下方進入之空氣迅速地導向葉片13，從而加速氣體流動 [0015] 综上所述，本發明符合發明專财件，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。 【圖式簡單說明】 [0016] [0017] [0018] [0019][0001] The present invention relates to a centrifugal fan, and more particularly to a fan structure of a centrifugal fan and a centrifugal fan using the same. [Prior Art] [0002] With the rapid development of the computer industry, the CPU pursues high speed, and the heat dissipation problem caused by high functionality and miniaturization is becoming more and more serious, which is more in an electronic device with a small internal space such as a notebook computer. To stand out. If the heat generated by the electronic components such as the CPU in the notebook cannot be dissipated in a timely and effective manner, the performance of the electronic components will be greatly affected, and the service life of the electronic components will be reduced. Therefore, the electronic components must be dissipated. [0003] At present, in a notebook computer, a heat dissipation module composed of a heat conductor, a heat pipe, a heat sink, and a centrifugal fan is often used to dissipate heat from the electronic components. The heat conductor is attached to the electronic component, and the heat conductor and the heat sink are connected by a heat pipe, 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 centrifugal fan plays an important role in the heat dissipation module. The faster the flow rate of the centrifugal fan and the larger the air volume, the more heat is exchanged with the heat sink, effectively dissipating the heat of the electronic components. However, the blades of the centrifugal fan currently used are usually flat-plate type blades, and the flow guiding effect is not good, so that the centrifugal fan is difficult to generate a high flow rate and a large air volume, and it is difficult to cope with the electrons that effectively generate high heat in a small space. The need for components to dissipate heat. SUMMARY OF THE INVENTION [0004] In view of this, it is necessary to provide a high flow rate and a large wind 096123682 Form No. A010] Page 3 / Total 15 Page 0993419170-0 1338552 Dan from November 23, 099 Replace the fan blade structure of the fan and the centrifugal fan 采用 [0005] (4) using the fan blade structure. The fan 'includes a fan blade structure having a hub and a plurality of blades radially distributed in the circumferential direction of the hub, each blade having a windward surface 'where the width of each of the blades is radially outward of the rim The direction decreases. The windward surface of the blade is a concave curved shape that gradually retracts toward the middle of the blade along the upper and lower edges of the blade. [0006] The fan blade structure of the He% fan is provided with a ring plate on the outer circumference of the wheel. Each blade has a connection with the outer circumferential surface of the ring plate, and a connecting end and a free end opposite to the connecting end. On the upper surface of the _, each blade is formed with a flow guiding portion that is connected to the blade. [0007] Compared with the prior art, in the fan blade structure of the centrifugal fan, the width of the blade decreases in the radial outward direction of the hub, and the windward surface of the blade is along the upper and lower edges of the blade to the blade. The central portion gradually retracts into a concave curved shape, and the concave concave curved surface has a guiding effect on the airflow, and the tapered blade can compress the airflow flowing along the concave curved surface, thereby causing the airflow flowing from the free end of the blade Has a higher flow rate. In addition, a surface of the annular plate that is circumferentially arranged outside the hub of the blade is formed with a flow guiding portion corresponding to each blade, and the flow guiding portion can guide the airflow to the blade to accelerate the gas. The flow increases the flow rate of the centrifugal fan. 1 is a perspective view of a preferred embodiment of a blade structure 10 of a centrifugal fan according to the present invention. The blade 10 includes a hub n, a ring plate 12, a plurality of blades 13, and a plurality of diversions. Part 14. 096123682 Form Compilation A0101 Page 4 of 15 0993419170-0 1338552 __ November 23, 2010 Pressing the replacement page [0009] The wheel 11 has a top surface 111 and an outer peripheral surface 112. The ring plate 12 is disposed on the outer circumferential surface 112 of the wheel 11 and is located at the middle of the axial direction of the outer circumferential surface 112. The vanes 13 are radially evenly distributed in the circumferential direction of the hub n and are connected to the outer peripheral surface 121 of the ring plate 12. Each of the blades 13 has a connecting end 131 connected to the outer peripheral surface 121 of the ring plate 12 and a free end 132 opposite to the connecting end 131. The width of the blade 13 extends from the connecting end 131 of the blade 13 to the free end of the blade 13. 132 is decremented, i.e., the width of the blade 13 at the connecting end 131 is greater than its width at the free end 132. Referring to FIG. 2 and FIG. 3 together, the upper portion 133 and the lower portion 134 of the blade 13 at the connecting end 131 protrude from the upper and lower surfaces 122 and 123 of the ring plate 12 in the axial direction of the hub 11, respectively, so that the blades 13 are connected. The end 131 can have a larger width. Each blade 13 extends from the upper portion of its connecting end 131: 1:33 along the radial direction of the hub 11 to form a flow guiding portion 14 on the upper surface 122 of the ring plate 12, and the inside of the guiding portion 14 The end is connected to the outer peripheral surface 112 of the hub 11. [0010] As shown in FIG. 4, each blade 13 includes a windward surface 135 and a leeward surface 136 opposite the windward surface 135. During the operation of the blade 10, the windward surface 135 of the blade 13 is at The direction of rotation of the blade 10 is located in the front face of the leeward surface 136. The windward surface 135 of the blade 13 is a concave curved surface that gradually retracts toward the middle of the blade 13 along the upper and lower edges of the blade 13. Each of the blades 13 further includes a first circular arc surface 137 connected between the upper edge of the windward surface 13 5 and the upper edge of the leeward surface 136 and a lower edge of the lower edge of the windward surface 136 and the lower edge of the leeward surface 136 The second arc surface 138 between. [0011] With continued reference to FIG. 2, the flow guiding portion 14 connected to each of the blades 13 also has a windward surface 141 and a leeward surface 142, wherein the windward surface 141 of the flow guiding portion 14 is along the flow guiding portion 14. The lower edge of the upper edge guide flow portion 14 is gradually 096123682. Form No. A0101 Page 5 / Total 15 Page 0993419170-0 1338552 November 23, 2003 Correction of the thin bevel in the replacement page, wherein the windward side of the flow guiding portion 14 1 4 1 can also be - curved surface per guide! 4 also has a side surface (4) connected between the upper edge of the windward surface 4] and the upper edge of the leeward surface 142. [0012] The scalloped sample 10 can be used in a fan frame of a centrifugal fan or a heat sink provided with a heat sink. In the case of the guard, the blade 1Q structure is rotated in the direction shown by the arrow R, and the windward surface 141 of the flow guiding portion 14 and the wind surface 135 of the blade 13 are respectively rotated in the direction of rotation of the blade structure 1 Located in front of the respective leeward faces 142, 136. The windward surface 141 of the flow guiding portion 14 is a retracted inclined surface, and the air sucked from above the annular plate 12 can be quickly guided to the blade by the windward surface 141 of the guiding portion 14. 13, so that the flow of the airflow can be accelerated, and the flow rate of the centrifugal fan is increased, and the bird's rafts 35 of the 'blade' 3 are formed along the upper and lower edges of the blade 13 toward the middle of the blade 13, a concave curved surface, The flow of the guide portion 14 to the vane 13 will flow radially outwardly of the hub 11 along the windward surface 135 of the vane 13. The width of the vane 13 will decrease from the connecting end 131 of the vane 13 to the free end 132 of the vane 13, The airflow of the windward surface 35 of the blade 13 along the radial outward direction of the hub 11 is gradually compressed, so that the airflow flowing from the free end 132 of the blade 13 has a higher flow velocity. [0013] Compared with the fan blade structure of the centrifugal fan, the fan of the above centrifugal fan In the leaf structure 10, the windward surface 135 of the blade 13 is a concave curved surface which is gradually retracted toward the middle of the blade 13 along the upper and lower edges of the blade 13, and the width of the blade 13 is free from the connecting end 131 of the blade 13 to the blade 13. The end 132 is decremented 'the indented concave curved surface has a guiding effect on the air flow, and the tapered blade 〖3 can gradually compress the airflow flowing along the concave curved surface, so that the airflow flowing out from the free end 132 of the blade 13 The flow rate is higher. In addition, the ring plate 12 is looped around the outer surface 112 of the hub 11 of the blade 10, and 096123682 Form No. A0101 Page 6 of 15 0993419丨70-0 1338552 I ·* November 099 On the 23rd, on the upper surface 122 of the ring plate 12, a flow guiding portion 14' connected to the blade 13 is formed. By the flow guiding portion 14, the airflow can be quickly guided to the blade i3, thereby accelerating the gas flow and making the heart fan The flow rate is increased. By the arrangement of the ring plate j 2 and the flow guiding portion 14, the connection strength of the blades 13 can be increased to ensure that the blades 13 are not broken by the excessively high rotational speed. [0014] In the example, the flow guiding portion 14 is only disposed on the upper surface 122 of the ring plate 12, In an understanding, the fan blade structure 1 of the centrifugal fan may also be disposed in the fan frame of the centrifugal fan having the upper and lower double air inlets. In this case, the lower surface 123 of the ring plate 12 may also correspond to each of the The blade 13 forms another flow guiding portion, that is, two upper and lower symmetrical guiding portions are formed on the upper and lower surfaces 122 and i23 of the ring plate 12, and the other guiding portion can enter the air from below the ring plate 12 Quickly guiding the blade 13 to accelerate the gas flow [0015] In summary, the present invention complies with the invention of the special wealth, and patents are filed 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. BRIEF DESCRIPTION OF THE DRAWINGS [0019] [0019] [0019]
圖1係本發明離心風扇之扇葉結構其中一較佳實施例之立 體圖。 圖2係圖1所示離^風扇之扇葉結構之側視圖。 圖3係圖1所—心風扇之扇葉結構之俯視圖。 圖4係圖3中沿IV-IV線之剖面圖。 【主要元件符號說明】 096123682 表單編琥A0101 笫7頁/共丨5頁 0993419170-0 1338552 099年11月23日按正替换頁 [0020] 扇葉結構：1 0 [0021] 輪轂：1 1 · [0022] 頂面：1 1 1 [0023] 外周面：1 1 2、1 2 1 [0024] 環板：12 [0025] 上表面：122 [0026] 下表面：123 [0027] 葉片：13 [0028] 連接端：131 [0029] 自由端：132 [0030] 上部：133 [0031] 下部：134 [0032] 迎風面：135、141 [0033] 背風面：136、142 [0034] 第一圓弧面：137 [0035] 第二圓弧面：138 [0036] 導流部：14 [0037] 圓弧面：143 096123682 表單編號A0101 第8頁/共15頁 0993419170-0BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a preferred embodiment of a blade structure of a centrifugal fan of the present invention. Figure 2 is a side elevational view of the blade structure of the fan shown in Figure 1. Figure 3 is a plan view of the blade structure of the heart fan of Figure 1. Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3. [Description of main component symbols] 096123682 Form suffix A0101 笫7 pages/total 丨5 pages 0993419170-0 1338552 November 23, 2009 Press positive replacement page [0020] Fan blade structure: 1 0 [0021] Wheel hub: 1 1 · Top surface: 1 1 1 [0023] Outer peripheral surface: 1 1 2, 1 2 1 [0024] Ring plate: 12 [0025] Upper surface: 122 [0026] Lower surface: 123 [0027] Blade: 13 [ 0028] Connection: 131 [0029] Free end: 132 [0030] Upper: 133 [0031] Lower: 134 [0032] Windward side: 135, 141 [0033] leeward side: 136, 142 [0034] First arc Face: 137 [0035] Second arc face: 138 [0036] Guide section: 14 [0037] Arc face: 143 096123682 Form number A0101 Page 8 of 15 0993419170-0