I267584 玟、發明說明 【發明所屬之技術領域】 本發明係有關於一種離心式風扇（Centrifugal Fan)， 特別是有關於-種舌口形狀處之渦型側板的表面形成至 少一大致呈水平方向延伸之凹槽的離心式風扇。 【先前技術】 -般而言，可攜式電子設備，尤其是筆記型電腦(Note Book Personal Computer) ’為了能發揮最大的效能需要 有散熱模組進行有效散熱。若熱量聚集在設備内部而無法 即時散掉時，將使電子元件無法正常工作，甚至使整個設 備工作不正常，尤其是電腦系統更會因此而當機。缺而， 筆記型電腦為了因貞行動化的市場需求，機殼内部已無法 預留出足夠的自然'對流空間。由於高頻部分在執行散熱設 計上已面臨相當的瓶頸，因此筆記型電腦之散熱模組^漸 朝向以離心式風扇產生強制對流進行散熱。 請參照第1圖，其係输示習知之離心式風扇之立體結 構圖。此離心式風扇10係適用於可攜式電子裝置，例如 筆記型電腦，且此離心式風扇1〇至少包含：殼體丨丨及風 扇葉片31。殼體11具有渦型側板13以及底板15，且殼 體11定義出腔體17及出風口 19，其中腔體17與出風口 19共同形成一渦型流道21，而出風口 19處之一侧的渦型 侧板13則形成一舌口形狀23。風扇葉片31係以一垂直 軸33設於腔體17之底板15之上。當風扇葉片31轉動時， 1267584 風扇葉片3 1所驅動之水平方向氣流25，經由渦型流道21 產生動壓與靜壓而將氣流25送出。 習知之出風口 19處係利用固定截面之曲面漸擴管 道，意即舌口形狀23處之渦型側板i3的表面16係平行 於軸33,使氣體流動而產生動壓與靜壓，氣體就有足夠 之動壓與靜壓來抵抗外#阻力，達到散熱的效果，如第 1A圖所示。 請參照第2圖，其係繪示習知之離心式風扇產生之尾 流撞擊於舌口形狀處之渦型側板的示意圖。風扇葉片31 產生的尾流（Wake Fl〇W)35撞擊舌口形狀23處之渦型侧 板13的表面16時，每個衝擊點41可視為產生窄頻噪音 (Namm Ban(i Noise)43之發音源，由於舌口形狀23處之 渦型侧板13❸表® 16係平行於車由33 ,依照波的疊加原 理，將產生具有大振幅45且固定頻率之扇葉基頻噪音 (Blade Pass Frequency)43。一旦需提昇散熱效能，勢必要 增=風量及風速，然而當轉速增加且提高流量時，卻得到 更兩頻率的噪音頻譜，使得噪音值越高。 鑒於上述，亟需改善舌口形狀處之渦型側板，以解決 離心式風扇造成之噪-音問題。 【發明内容】 本發月的目❺之一就是揭冑一種離心式風扇，係適 2攜式電子裝置，此離心式風錢體之渦型側板成舌 而舌口形狀處之渦型側板的表面形成至少一大致 1267584 t平方向延伸之凹槽，因此當風扇葉片轉動所產生之尾流 才里擊舌口形狀處之渦型側板的表面時，可降低風扇的噪 f 〇 、 根據本發明上述之目的，提出一種離心式風屬，此離 心式風扇係適用於可攜式電子裝置，且此離心式風扇至少 包含·一殼體，此殼體具有底板以及渦型側板，渦型側板 係叹置於底板上並定義出腔體及出風口，且於該出風口之 至少一側之渦型侧板成舌口形狀；以及風扇葉片，風扇葉 片係轴設於腔體之底板之上；其中舌口形狀處之渦型侧板 上形成至少一大致呈水平方向延伸之凹槽。 依照本發明一較佳實施例，上述之可攜式電子袭置為 筆記型電腦。 依照本發明一較佳實施例，上述舌口形狀處之渦型側 板之表面可具有一條或多條大致呈水平方向延伸之凹槽。 本發明之離心式風扇於舌口形狀處之渦型側板之表 面，形成至少一大致呈水平方向延伸之凹槽，不僅製造方 便，更改善離心式風扇造成之噪音問題。 【實施方式】— 明參知第3圖，其係緣示根據本發明一較佳實施例之 離心式風扇之立體結構圖。此離心式風扇1 〇〇係適用於可 攜式電子裝置’例如筆記型電腦，且此離心式風扇i00 至少包含··一辑體111及風扇葉片131。殼體U1具有渦 型側板113以及底板115,且殼體111定義出腔體117及 1267584 :風口 119’其中腔體117與出風口 119共同形成一渦型 、I 2 1而出風口 11 9之至少一側之渦型側板〗丨3則形 成舌口形狀123。風扇葉片131係藉由一軸133架設於 腔體117之底板115之上，而車由133以垂直於底板⑴ 為較佳。當風扇葉片131轉動時，風扇葉片131所驅動之 平方向乳机125’經由渦型流道121產生動壓與靜壓而 將氣流125送出。同時，風扇葉片131轉動所產生之尾流 135撞擊舌口形狀123處之渦型側板113的表面116時， 本發明之舌口形狀123處係利用形成於侧板113表面ιΐ6 之水平延伸凹槽118，破壞尾流135在舌口形狀123處之 渦型側板113的表面116所造成的波疊加現象，因而可降 低噪音。根據本發明，凹槽118可藉由塑膠射出成形、金 屬鑄造、或金屬衝壓等方式，一體成型於殼體U1上。 咐 >”、、第4圖，其係纷示根據本發明一較佳實施例之 離心式風扇產生之尾流撞擊於舌口形狀處之渦型側板的 示意圖。風扇葉片131產生的尾流135撞擊舌口形狀123 處之渦型侧板113之表面116時，每個衝擊點141可視為 產生扇葉基頻噪音143之發音源，由於表面116上形成一 水平延伸凹槽118,使得每個發音源產生的時間不同，如 此不同時域之發音源所造成聲波會互相重疊，使得振幅 145會大幅減少，意即扇葉基頻噪音143的強度減小。 根據本發明，形成於表面116上之水平延伸凹槽118 之一部份係對應於風扇葉片131之尾流135流經之區域。 舉例而言，參照第4A圖，本發明之舌口形狀i23處之渦 1267584 ^板⑴之表面116上所形成之凹槽ιΐ8係面對風扇華 片131尚度方向之中間位置，其當然亦可設計為面岸' 葉片⑶高度方向之相對上側或上 之-部分對應於風扇葉片131之尾，二要凹槽118 外，太瘀明> 灸尾机135流經夂區域。此 卜^月之舌口形狀123處之渴型側板ιΐ3之表面 ，成二只或三只大致呈水平方向延伸之凹槽心如 所圖示，其㈣示根據本發明—較佳實施例之離心 式風扇之立體結構圖’其中表面116上設有—只水平延伸 凹槽118,且該凹槽具有一呈矩形之斷面。 請參考第5圖，其係緣示根據本發明另一較佳實施例 之離心式風扇之立體結構圖，其中表面116上則形成二。 ^形之斷面之凹槽118。請參考第6圖，其係緣示根據 本發明又-較佳實施例之離心式風扇之立體結構圖，其中 表面116上形成一具有弧形斷面之凹# u8a。然:本發明 不限定於上述之凹槽數量或斷面形狀，任何熟習此㈣術 者當了解可利用其他方式，並視實際需求而調整本發明凹 槽數量或斷面形狀，或組合不同斷面形狀之數個凹槽以構 成表面，故在此不另贅述。 綜上所述，本發明之舌口形狀123處之渦型側板ιΐ5 之表面所形成之凹# 118τ每個發音源產生的時間不 同，以減低噪音之振幅145,讓使用者感覺到較佳的聲 音品質。 、，第7Α圖即為離心式風扇之蛇口未形成凹槽時之頻 譜，其位於900Hz及1900Ηζ之運轉頻率附近皆可觀察到 1267584BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal fan, and more particularly to a surface of a vortex side plate at a tongue shape forming at least one substantially horizontal extension. The centrifugal fan of the groove. [Prior Art] In general, portable electronic devices, especially notebooks (Note Book Personal Computer), require a cooling module for effective heat dissipation in order to maximize performance. If the heat accumulates inside the device and cannot be dissipated immediately, the electronic components will not work properly, and even the entire device will not work properly, especially if the computer system is down. Lack of, in order to be mobile, the notebook computer has been unable to reserve enough natural 'convection space' inside the chassis. Since the high-frequency part has faced a considerable bottleneck in performing the heat dissipation design, the heat-dissipating module of the notebook computer is gradually cooled toward the forced convection generated by the centrifugal fan. Referring to Fig. 1, a three-dimensional structure diagram of a conventional centrifugal fan is shown. The centrifugal fan 10 is suitable for use in a portable electronic device such as a notebook computer, and the centrifugal fan 1 includes at least a casing casing and a fan blade 31. The housing 11 has a vortex side plate 13 and a bottom plate 15, and the housing 11 defines a cavity 17 and an air outlet 19, wherein the cavity 17 and the air outlet 19 together form a vortex flow path 21, and one of the air outlets 19 The vortex side plate 13 on the side forms a tongue shape 23. The fan blades 31 are disposed on the bottom plate 15 of the cavity 17 with a vertical axis 33. When the fan blade 31 rotates, the horizontal airflow 25 driven by the fan blade 31 is sent to the airflow 25 via the vortex runner 21 to generate dynamic pressure and static pressure. The conventional air outlet 19 utilizes a curved section of the fixed section to gradually expand the duct, that is, the surface 16 of the volute type side plate i3 at the tongue shape 23 is parallel to the shaft 33, so that the gas flows to generate dynamic pressure and static pressure, and the gas is generated. There is enough dynamic pressure and static pressure to resist the external # resistance to achieve the effect of heat dissipation, as shown in Figure 1A. Referring to Fig. 2, it is a schematic view showing a vortex type side plate at the shape of a tongue which is generated by a conventional centrifugal fan. When the wake (Wake Fl W) 35 generated by the fan blade 31 strikes the surface 16 of the volute type side plate 13 at the shape of the tongue 23, each impact point 41 can be regarded as generating a narrow-frequency noise (Namm Ban (i Noise) 43 The source of the sound, because the vortex side plate 13 at the shape of the tongue 23 is parallel to the vehicle 33, according to the superposition principle of the wave, the baseband noise of the blade with a large amplitude of 45 and a fixed frequency will be generated (Blade Pass) Frequency) 43. Once the heat dissipation performance needs to be improved, it is necessary to increase the air volume and the wind speed. However, when the rotation speed increases and the flow rate is increased, a noise spectrum of two frequencies is obtained, so that the noise value is higher. In view of the above, it is necessary to improve the tongue. The vortex type side plate at the shape to solve the noise-tone problem caused by the centrifugal fan. [Invention] One of the goals of this month is to uncover a centrifugal fan, which is suitable for a portable electronic device. The vortex side plate of the wind money body is formed into a tongue, and the surface of the vortex type side plate at the shape of the tongue mouth forms at least one groove extending substantially in the direction of the plane, so that the shape of the tongue is generated when the fan blade rotates. Vortex type side plate In the meantime, the noise of the fan can be reduced. According to the above object of the present invention, a centrifugal type fan is proposed. The centrifugal fan is suitable for a portable electronic device, and the centrifugal fan includes at least one housing. The housing has a bottom plate and a vortex side plate, the vortex side plate is slanted on the bottom plate and defines a cavity and an air outlet, and the vortex side plate on at least one side of the air outlet is shaped like a tongue; and the fan blade, The fan blade is disposed on the bottom plate of the cavity; wherein the vortex side plate at the shape of the tongue is formed with at least one groove extending substantially in a horizontal direction. According to a preferred embodiment of the present invention, the portable type The electronic device is a notebook computer. According to a preferred embodiment of the present invention, the surface of the vortex side plate at the shape of the tongue may have one or more grooves extending substantially in a horizontal direction. The centrifugal fan of the present invention is The surface of the vortex side plate at the shape of the tongue is formed with at least one groove extending substantially in the horizontal direction, which is not only convenient to manufacture, but also improves the noise problem caused by the centrifugal fan. 3 is a perspective view showing a centrifugal fan according to a preferred embodiment of the present invention. The centrifugal fan 1 is suitable for a portable electronic device such as a notebook computer, and The centrifugal fan i00 includes at least one body 111 and a fan blade 131. The housing U1 has a vortex side plate 113 and a bottom plate 115, and the housing 111 defines a cavity 117 and a 1267884: a tuyere 119' in which the cavity 117 is The vent 119 forms a vortex type, I 2 1 and the vortex side plate 至少 3 of at least one side of the air outlet 11 9 forms a tongue shape 123. The fan blade 131 is erected on the bottom plate of the cavity 117 by a shaft 133. Above 115, the car is preferably 133 perpendicular to the bottom plate (1). When the fan blade 131 rotates, the flat direction machine 125' driven by the fan blade 131 generates dynamic pressure and static pressure via the vortex flow path 121 to send the air flow 125. At the same time, when the wake 135 generated by the rotation of the fan blade 131 strikes the surface 116 of the volute side plate 113 at the tongue shape 123, the tongue shape 123 of the present invention utilizes the horizontally extending groove formed on the surface ι6 of the side plate 113. 118, the wave superposition phenomenon caused by the surface 116 of the vortex side plate 113 at the tongue shape 123 at the tongue shape 123 is destroyed, thereby reducing noise. According to the present invention, the recess 118 can be integrally formed on the housing U1 by plastic injection molding, metal casting, or metal stamping.咐>", Fig. 4 is a schematic view showing a wake generated by a centrifugal fan according to a preferred embodiment of the present invention, which impacts a vortex side plate at the shape of a tongue. The wake generated by the fan blade 131 When 135 strikes the surface 116 of the volute side plate 113 at the tongue shape 123, each impact point 141 can be considered to produce a source of sound for the blade baseband noise 143, since a horizontally extending groove 118 is formed in the surface 116, such that each The time generated by the pronunciation sources is different, so that the sound waves caused by the sound sources of different time domains overlap each other, so that the amplitude 145 is greatly reduced, that is, the intensity of the blade fundamental frequency noise 143 is reduced. According to the present invention, the surface 116 is formed on the surface 116. One of the upper horizontally extending grooves 118 corresponds to the region through which the wake 135 of the fan blade 131 flows. For example, referring to FIG. 4A, the vortex at the tongue shape i23 of the present invention is 1267584 (plate) (1) The groove ι 8 formed on the surface 116 faces the middle of the direction of the fan blade 131, and may of course be designed such that the opposite side or the upper portion of the height direction of the blade (3) corresponds to the fan blade 131. Tail, second Outside the trough 118, too bright > The moxibustion tail machine 135 flows through the crotch region. The surface of the thirsty side plate ιΐ3 at the shape of the tongue of the month is two or three grooves extending substantially in the horizontal direction. As shown, (4) shows a three-dimensional structure diagram of a centrifugal fan according to the present invention, wherein the surface 116 is provided with a horizontally extending groove 118, and the groove has a rectangular shape. Please refer to FIG. 5, which is a perspective structural view of a centrifugal fan according to another preferred embodiment of the present invention, wherein a surface 116 is formed on the surface 116. Please refer to the groove 118 of the cross section. Figure 6 is a perspective structural view showing a centrifugal fan according to still another preferred embodiment of the present invention, wherein a recess #u8a having an arcuate cross section is formed on the surface 116. However, the present invention is not limited to the above. The number of grooves or the shape of the cross-section, any skilled person knows that other methods can be used, and adjust the number of grooves or the shape of the groove according to the actual needs, or combine several grooves of different cross-sectional shapes to It constitutes the surface, so it will not be described here. In summary, The recess #118τ formed by the surface of the vortex side plate ΐ5 at the tongue shape 123 of the present invention has a different time for each sound source to reduce the amplitude 145 of the noise, so that the user feels better sound quality. Figure 7 is the spectrum of the centrifugal fan with no grooves formed. It can be observed near the operating frequency of 900 Hz and 1900 126.
明顯的扇葉基頻噪音；f 7A 形成一 播仏 圃貝〗為在離心式風扇之蛇ΰ 及刚 頻譜，由第7Β圖中可發現，位於900Hz 0Hz附近的扇葉基頻噪音已明顯降低。、 風二上：本發明較佳實施例可知’應用本發明之離心式 i表面，形成至少-大致呈水;=形狀處之渦型侧板 大致呈水千方向延伸之凹槽，因此當Obvious fan blade fundamental frequency noise; f 7A forms a broadcast mussel as a snake and a rigid spectrum in a centrifugal fan. It can be found from Fig. 7 that the fundamental frequency noise of the blade near 900 Hz 0 Hz has been significantly reduced. . In the second embodiment of the present invention, it is known that the centrifugal type i surface of the present invention is used to form at least substantially water; the vortex side plate at the shape is substantially a groove extending in the water direction, so
風扇葉片轉動所產生之M 屋生之尾里擊舌口形狀處之渦型侧板 <表面時，可降低風扇的噪音。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何熟習此技藝者，在不脫離本發明之精神 和範圍内’當可作各種之更動與湖飾，因此本發明之保護 範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 第1圖係繪示習知之離心式風扇之立體結構圖； 第1A圖係繪示離心式風扇中驅動風扇葉片後所產生 之水平方向氣流； 第2圖係繪示習知之離心式風扇產生之尾流撞擊於 舌口形狀處之渦型側板的示意圖； 第3圖係繪示根據本發明一較佳實施例之離心式風 扇之立體結構圖； 第4圖係繪示根據本發明一較佳實施例之離心式風 扇產生之尾流撞擊於舌口形狀處之渦型側板的示意圖； 第4 A圖繪示根據本發明一較佳實施例之凹槽相對於 1267584 風扇葉片之位置； 第 5圖係、纟會示柄 面齢=^ 、曰'、乂據本發明另一較佳實施例之側板表 囬斷面示意圖； 第6圖係缘示根檐 面齡；-立 琛本發明又一較佳實施例之侧板表 卸斷面不意圖； 第7Α圖為離心式 譜；以及 、风屬之蛇口未形成有凹槽之風扁頻 頻 譜。第7Β圖為離心式風扇之蛇口形成有一凹槽之風扁 【疋件代表符號簡單說明】 11 : 殼體 15 ： 底板 17 ： 腔體 21 ： 渦型流道 25 ： 氣流 33 ： 4 L 41 ： 衝擊點 45 ： 振幅 111 :殼體 115 •底板 117 :腔體 118a:弧狀斷面凹槽 121 :渦型流道 125 :氣流 離心 涡型侧板 表面 凹槽 出風口 式風扇 1 〇 :離心式風扇 13 ·渦型側板 16 ·表面 19 :出風口 23 :舌口形狀 3 1 :風扇葉片 3 5 :尾流 43 :噪音 100 113 116 118 119 123 :舌口形狀 1267584 131 ： 風扇葉片 133 135 : 尾流 141 143 ： 噪音 145 轴 衝擊點 振幅When the fan blade rotates, the vortex side plate at the shape of the tongue in the tail of the M house can reduce the noise of the fan. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make various changes and lake decorations without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a conventional centrifugal fan; FIG. 1A is a horizontal flow of a centrifugal fan to drive a fan blade; FIG. 2 is a drawing A schematic diagram of a vortex-type side plate at the shape of a tongue formed by a centrifugal fan; FIG. 3 is a perspective view showing a centrifugal fan according to a preferred embodiment of the present invention; A schematic diagram of a vortex-type side plate at the shape of a tongue shape generated by a centrifugal fan according to a preferred embodiment of the present invention; FIG. 4A illustrates a groove relative to a 1267584 fan according to a preferred embodiment of the present invention. The position of the blade; Fig. 5 is a schematic view showing the back surface of the side plate according to another preferred embodiment of the present invention; - The side panel surface unloading section of the further preferred embodiment of the present invention is not intended; the seventh drawing is a centrifugal spectrum; and the wind flat frequency spectrum in which the wind is not formed with a groove. The seventh picture shows the wind of the centrifugal fan with a groove formed by a groove. [Brief description of the symbol] 11 : Housing 15 : Base plate 17 : Cavity 21 : Vortex flow path 25 : Air flow 33 : 4 L 41 : Impact point 45: Amplitude 111: Housing 115 • Base plate 117: Cavity 118a: Arc-shaped section groove 121: Vortex type flow path 125: Air flow centrifugal vortex side plate surface groove Outlet fan 1 〇: Centrifugal Fan 13 · Vortex side plate 16 · Surface 19 : Air outlet 23 : Tongue shape 3 1 : Fan blade 3 5 : Wake 43 : Noise 100 113 116 118 119 123 : Tongue shape 1267584 131 : Fan blade 133 135 : Tail Flow 141 143 : Noise 145 Axis Impact Point Amplitude