200928110 .九、發明說明： 【發明所屬之技術領域】 本發明涉及一種風扇，尤指一種對電子元件散熱 之離心風扇。 【先前技術】 隨著電腦產業之迅速發展，CPU追求高速度化， 咼功能化及小型化所衍生之散熱問題越來越嚴重，這 ❹ 在筆5己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i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， 因此必須對電子元件進行散熱。 目前在電腦内，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，導熱體與散熱片通過熱管連接， ❹ 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。因此，離心風扇在散熱模 組中起著極為重要之作用。 ' 傳統之離心風扇包括扇框、扇葉和上蓋。離心風 扇之轉速越高、流速越快、風量越大，則與散熱片六 換之熱量也就更多，從而有效地將電子元件之熱量散 發。然而這必然會導致離心風扇之噪音增加。 【發明内容】 有鐾於此’有必要提供一種具有較小操音之離心 6 200928110 風扇。 一種離心風扇，包括— μ. , a, ^ ^ 栝底座、蓋設於底座上之— ^ ^ ^α 、 盍之間之定子與轉子，所述底 座匕括一底板以及由底板向上 - 子與底座之側壁之間形成—、士 轉 少队 /现道所述側壁上設有一 出風口，所述侧壁在靠近出 _ Α 山风口之位置向離心風扇之 内部凸伸有一舌口，所述古 > 舌口之橫截面之尺寸沿舌口 之向度方向變化。200928110. IX. INSTRUCTIONS: TECHNICAL FIELD The present invention relates to a fan, and more particularly to a centrifugal fan that dissipates heat from an electronic component. [Prior Art] With the rapid development of the computer industry, the CPU pursues high speed, and the heat dissipation problem caused by the functionalization and miniaturization becomes more and more serious, which is in the electronic device with a small internal space such as a computer. More prominent. 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 component will be greatly affected, and the service life of the electronic component will be reduced, so that the electronic component must be dissipated. At present, in the 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 extremely important role in the heat dissipation module. 'The traditional centrifugal fan consists of a fan frame, a fan blade and an upper cover. The higher the rotational speed of the centrifugal fan, the faster the flow rate, and the larger the air volume, the more heat is exchanged with the heat sink, thereby effectively dissipating the heat of the electronic components. However, this inevitably leads to an increase in the noise of the centrifugal fan. SUMMARY OF THE INVENTION It is necessary to provide a centrifugal fan with a small sound operation 6 200928110. A centrifugal fan includes a μ. , a, ^ ^ 栝 base, a stator and a rotor disposed between the base and the ^ ^ ^ α, and the base, the base includes a bottom plate and the bottom plate is up-to-child Forming a gap between the side walls of the base, and the side wall of the current passage is provided with an air outlet, and the side wall protrudes toward the inside of the centrifugal fan with a tongue opening at a position close to the outlet of the mountain. Ancient > The size of the cross section of the tongue varies along the direction of the tongue.
❹ 一種離心風扇，包括—庇# # — 枯底座、蓋設於底座上之一 上蓋以及位於底座和上芸之Μ … 風之間之定子與轉子，所述底 座包括一底板以及由底被命μ 伋向上延伸之一側壁，所述轉 子與底座之側壁之間形成—、治，皆 ^ ^ /爪道，所述側壁上設有一 出風口 ’所述侧壁在靠近出風口之位置向離心風扇之 内部凸伸有-舌口 ’所述舌口之内表面相對於底座之 底板傾斜設置。 與舌口之内表面與底板之上表面相垂直之離心風 扇相比，本發明中舌口之内表面相對底座之底板傾斜 e又置，打亂了諧波之長短，阻礙了高次諧波之疊加與 本曰共振之形成。此結構設計可降低風扇運轉時產生 之噪音’從而可改善風扇之整體性能。 【實施方式】 下面將結合附圖對本發明實施例作進一 步之詳細說明。 申"月人利用 CFD (Computational Fluid Dynamics， 7 200928110 計算流體力學）軟體對上述離心風扇進行不斷試驗及 流場模擬發現，在離心風扇之扇葉通過舌口所圍成在 狹小區域内時，伴隨有諸多高次諧波之疊加，從而使 舌口處之嗓音較大。因此，發明人以如何減小舌口區 域高次諧波之疊加為出發點，來探討如何降低舌口處 之噪音，始有本發明之誕生。 如圖1及圖2所示，所述離心風扇10包括一底座 12、蓋設於底座12上之一上蓋14以及位於底座12 和上蓋14之間之定子（圖未示）與轉子16。 所述底座12包括一底板121以及由底板121周緣 向上延伸之一渦形之侧壁122。所述底板121與上蓋 14内分別設有一進風口 123，所述侧壁122上開設有 與所述進風口 123相垂直之出風口 124。所述出風口 124具有一近風端124a以及與近風端124a相對之一 遠風端124b，當所述離心風扇10工作時，所述轉子 16驅動氣流由出風口 124之近風端124a流向遠風端 124b。 所述轉子16包括一輪轂162以及由輪轂162周緣 向外放射狀延伸之若干個扇葉164。所述扇葉164之 自由端與底座12之侧壁122間形成一環形之流道 125。所述流道125之寬度沿逆時鐘方向由出風口 124 之遠風端124b向近風端124a逐漸增加。 所述侧壁122在靠近出風口 124之遠風端124b 之位置向離心風扇10之内部凸伸有一近似三角形之 8 200928110 舌口 126，所述舌口 126與側壁122及底板121 —體 成型。所述舌口 126具有一靠近流道125之第一表面 126a、一遠離流道125且靠近出風口 124之第二表面 126b、以及連接所述第一及第二表面126a、126b之連 接面126c。所述第一表面126a是一狐面，且沿流道 125之延伸方向延伸。所述第二表面126b為一近似之 平面，可以理解地，所述第二表面126b也可以是一弧 面。所述連接面126c為一光滑連接所述第一及第二表 面126a、126b之曲面。所述第一表面126a靠近所述 第二表面126b之末端之延長線與所述第二表面126b 靠近所述第一表面126a之末端之延長線之間形成一 夾角，本實施例中，所述夾角為鈍角。 所述第一表面126a、第二表面126b以及連接面 126c共同構成舌口 126之内表面126d，所述内表面 126d之各組成部分即第一表面126a、第二表面126b 以及連接面126c相對所述底板121之上表面121a傾 斜設置，使所述舌口 126之橫截面之尺寸沿由底板121 向上蓋14之方向逐漸減小。 與舌口之内表面與底板之上表面相垂直之離心風 扇相比，本發明採用立體之斜坡形舌口 126，使舌口 126之内表面126d之各組成部分相對底板121之上表 面121a傾斜設置，打亂了諧波之長短，阻礙了高次諧 波之疊加與噪音共振之形成。此結構設計可降低離心 風扇10運轉時產生之噪音，從而可改善離心風扇10 9 200928110 之整體性能。 . 本實施例中，所述舌口 126之橫截面之尺寸 底板121向上蓋14之方向逐漸減小。可以理解地 • 述舌口 126之橫截面之尺寸也可沿由底板121向上蓋 14之方向逐漸增加（如圖3所示），或者由舌口工％ 之高度之中部126e分別向底板121與上蓋14之方向 逐漸減小（如圖4所示），或者由舌口 126之高度之; Q 部126e分別向底板121與上蓋14之方向逐漸增加（如 圖j所示），使舌口 126之橫截面之尺寸沿舌口 126 之高度方向變化，或者說，使舌口 126之内表面GW 相對底板121之上表面121a傾斜設置。 本實施例中，所述舌口 126之各組成部分即第一 表面126a、第二表面126b以及連接面126c，均相對 底板121之上表面121a傾斜設置。可以理解地，可以 僅僅使舌口 126之一個組成部分即僅使舌口 126之第 〇 一表面126a、第二表面126b與連接面i26c之其中之 一相對底板121之上表面12la傾斜設置，或使舌口 126之其中兩個組成部分相對底板ι21之上表面12u 傾斜設置。 综上所述’本發明符合發明專利要件，麦 依法提出專利申請。惟’以上該者僅為本發明 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。 10 200928110 【圖式簡單說明】 圖1是本發明之離心風扇之一較佳實施例之分解 •示意圖。 -圖2是圖1中所示離心風扇移除上蓋後之俯視示 意圖。 圖3是本發明之離心風扇之第二較佳實施例之底 座之立體不意圖。 圖4是本發明之離心風扇之第三較佳實施例之底 ❹ 座之立體示意圖。 圖5是本發明之離心風扇之第四較佳實施例之底 座之立體不意圖。 【主要元件符號說明】 離心風扇 10 底座 12 底板 121 側壁 122 上表面 121a 進風口 123 出風口 124 近風端 124a 遠風端 124b 流道 125 舌口 126 第一表面 126a 第二表面 126b 連接面 126c 内表面 126d 中部 126e 上蓋 14 轉子 16 輪轂 162 扇葉 164 11离心 A centrifugal fan, comprising: a sheltered base, an upper cover that is placed on the base, and a stator and a rotor between the base and the upper wind, the base includes a bottom plate and is bottomed a side wall extending upwardly from the side wall, the rotor and the side wall of the base form a line, a rule, a ^ ^ / claw path, the side wall is provided with an air outlet 'the side wall is centrifugally located near the air outlet The inner surface of the fan protrudes from the tongue-portion. The inner surface of the tongue is inclined with respect to the bottom plate of the base. Compared with the centrifugal fan whose inner surface of the tongue is perpendicular to the upper surface of the bottom plate, the inner surface of the tongue is tilted relative to the bottom plate of the base in the present invention, which disturbs the length of the harmonics and hinders the higher harmonics. The superposition and the formation of the resonance of the 曰. This structural design reduces the noise generated by the fan's operation and improves the overall performance of the fan. [Embodiment] Hereinafter, the embodiment of the present invention will be further described in detail with reference to the accompanying drawings. Shen "monthly using CFD (Computational Fluid Dynamics, 7 200928110 computational fluid dynamics) software to continuously test and flow field simulation of the above-mentioned centrifugal fan, found that when the fan blade of the centrifugal fan is enclosed in a narrow area through the tongue Along with the superposition of many higher harmonics, the arpeggio at the tongue is larger. Therefore, the inventors have begun to discover the present invention by how to reduce the superposition of higher harmonics in the tongue area as a starting point to explore how to reduce the noise at the tongue. As shown in FIG. 1 and FIG. 2, the centrifugal fan 10 includes a base 12, an upper cover 14 disposed on the base 12, and a stator (not shown) and a rotor 16 between the base 12 and the upper cover 14. The base 12 includes a bottom plate 121 and a side wall 122 extending upward from a periphery of the bottom plate 121. An air inlet 123 is defined in the bottom plate 121 and the upper cover 14, and an air outlet 124 perpendicular to the air inlet 123 is defined in the side wall 122. The air outlet 124 has a proximal end 124a and a distal end 124b opposite to the proximal end 124a. When the centrifugal fan 10 is in operation, the rotor 16 drives airflow from the proximal end 124a of the air outlet 124. Far wind end 124b. The rotor 16 includes a hub 162 and a plurality of blades 164 extending radially outwardly from the periphery of the hub 162. An annular flow passage 125 is formed between the free end of the blade 164 and the side wall 122 of the base 12. The width of the flow path 125 gradually increases from the far wind end 124b of the air outlet 124 to the near wind end 124a in the counterclockwise direction. The side wall 122 protrudes from the far air end 124b of the air outlet 124 toward the interior of the centrifugal fan 10 with an approximately triangular 8 200928110 tongue 126. The tongue 126 is integrally formed with the side wall 122 and the bottom plate 121. The tongue 126 has a first surface 126a adjacent to the flow channel 125, a second surface 126b remote from the flow channel 125 and adjacent to the air outlet 124, and a connection surface 126c connecting the first and second surfaces 126a, 126b. . The first surface 126a is a fox surface and extends along the extending direction of the flow channel 125. The second surface 126b is an approximate plane. It is to be understood that the second surface 126b may also be an arc surface. The connecting surface 126c is a curved surface that smoothly connects the first and second surfaces 126a, 126b. An extension line between the extension of the first surface 126a near the end of the second surface 126b and the extension of the second surface 126b near the end of the first surface 126a is formed. In this embodiment, the The angle is an obtuse angle. The first surface 126a, the second surface 126b, and the connecting surface 126c together form an inner surface 126d of the tongue 126. The respective components of the inner surface 126d, that is, the first surface 126a, the second surface 126b, and the connecting surface 126c are opposite The upper surface 121a of the bottom plate 121 is disposed obliquely such that the size of the cross section of the tongue 126 gradually decreases in the direction from the bottom plate 121 to the upper cover 14. The present invention employs a three-dimensional ramp-shaped tongue 126 such that the components of the inner surface 126d of the tongue 126 are inclined relative to the upper surface 121a of the bottom plate 121, as compared to a centrifugal fan having an inner surface of the tongue perpendicular to the upper surface of the bottom plate. The setting disturbs the length of the harmonics and hinders the superposition of higher harmonics and the formation of noise resonance. This structural design reduces the noise generated by the operation of the centrifugal fan 10, thereby improving the overall performance of the centrifugal fan 10 9 200928110. In this embodiment, the size of the cross section of the tongue 126 is gradually reduced in the direction of the upper cover 14. It can be understood that the cross-section of the tongue 126 can also be gradually increased in the direction from the bottom plate 121 to the upper cover 14 (as shown in FIG. 3), or from the height 126e of the tongue-and-mouth portion to the bottom plate 121, respectively. The direction of the upper cover 14 is gradually reduced (as shown in FIG. 4), or by the height of the tongue 126; the Q portion 126e is gradually increased toward the bottom plate 121 and the upper cover 14, respectively (as shown in FIG. j), so that the tongue 126 The size of the cross section varies along the height of the tongue 126, or the inner surface GW of the tongue 126 is inclined with respect to the upper surface 121a of the bottom plate 121. In this embodiment, the first surface 126a, the second surface 126b, and the connecting surface 126c of the tongue 126 are inclined with respect to the upper surface 121a of the bottom plate 121. It can be understood that only one component of the tongue 126, that is, only one of the first surface 126a, the second surface 126b and the connecting surface i26c of the tongue 126 is inclined with respect to the upper surface 12la of the bottom plate 121, or Two of the components of the tongue 126 are inclined with respect to the upper surface 12u of the bottom plate 119. In summary, the invention conforms to the patent requirements of the invention, and the patent application is filed by Mai. However, the above is only a preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims. 10 200928110 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view of a preferred embodiment of a centrifugal fan of the present invention. - Figure 2 is a top plan view of the centrifugal fan shown in Figure 1 with the upper cover removed. Fig. 3 is a perspective view of the base of the second preferred embodiment of the centrifugal fan of the present invention. Fig. 4 is a perspective view showing the bottom shank of the third preferred embodiment of the centrifugal fan of the present invention. Fig. 5 is a perspective view showing the base of the fourth preferred embodiment of the centrifugal fan of the present invention. [Main component symbol description] Centrifugal fan 10 Base 12 Base plate 121 Side wall 122 Upper surface 121a Air inlet 123 Air outlet 124 Near wind end 124a Far wind end 124b Flow path 125 Tongue 126 First surface 126a Second surface 126b Connection surface 126c Surface 126d middle 126e upper cover 14 rotor 16 hub 162 fan blade 164 11