1260485 五、發明說明α) 【發明所屬之技術領域】 本發明是有關於一種離心式風扇，且特別是有關於一種具 有共鳴式消音裝置的離心式風扇。 【先前技術】 隨著電腦行動化的市場需求，筆記型電腦機殼内部已無法 預留出足夠的自然對流空間，供散熱設計所需的空間。尤 其在高頻元件（例如中央處理器和繪圖晶片），已經面臨相 當散熱設計執行上的瓶頸。因此，利用離心式風扇產生強 制對流散熱方法已經是現在筆記型電腦散熱機制之主要架 構。 離心式風扇乃是利用蝸形外殼曲面漸擴的流道設計（如第1 圖所示），離心式扇葉1 6將氣體動能轉為壓力能，用以得 到較佳的靜壓以克服筆記型電腦内系統流阻高的特性。然 而，空氣1 8在流道内與外殼1 4等機構件摩擦造成的渦流 (ν 〇 r t e X ) 1 5，可得到較佳的靜壓以克服筆記型電腦内系統 之高流阻。另一方面，空氣在流道内與葉片外殼等機構件 摩擦造成的渦流（ν 〇 r ΐ e X) 1 5，以及蜗形漸擴曲線外殼產生 的背壓變化，會產生嚴重的噪音。一旦風扇需提升散熱效 能，勢必要增加風量（風速）。然而，流場增加的擾動又 會使噪音提高，因而造成噪音與散熱議題上的兩難困境。 如何解決此一兩難困境成了筆記型電腦製造商即將面臨的 挑戰。 【發明内容】BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a centrifugal fan, and more particularly to a centrifugal fan having a resonance muffling device. [Prior Art] With the market demand for computerized mobile phones, there is no way to reserve enough natural convection space inside the notebook computer case for the space required for heat dissipation design. Especially in high-frequency components (such as central processing units and graphics chips), they have already faced bottlenecks in the implementation of equivalent thermal design. Therefore, the use of a centrifugal fan to generate a strong convection heat dissipation method has become the main structure of the notebook computer cooling mechanism. The centrifugal fan is a flow channel design that uses a curved surface of the volute casing (as shown in Figure 1). The centrifugal fan 16 converts the gas kinetic energy into pressure energy for better static pressure to overcome the notes. The system has high flow resistance in the computer. However, the eddy current (ν 〇 r t e X ) 15 caused by the friction of the air 18 with the outer casing 14 and the like in the flow path can provide a better static pressure to overcome the high flow resistance of the system in the notebook computer. On the other hand, the eddy current (ν 〇 r ΐ e X) 15 caused by the friction of the air in the flow path with the blade member and the like, and the back pressure change caused by the volute divergent curved casing may cause severe noise. Once the fan needs to improve heat dissipation, it is necessary to increase the air volume (wind speed). However, the increased disturbance of the flow field will increase the noise, thus causing a dilemma in the issue of noise and heat. How to solve this dilemma has become a challenge for notebook manufacturers. [Summary of the Invention]
1260485 彡、發明說明⑵ -— 国此本發明的目的犹是在提供一種具有共 说士 ,，用 从 风屬運作時所造成的。品立 槔據本發明之上述目的，提出一種具有共 J =二日。 離心式風屬。A離心式風扇包含—離心式眉'‘及J的 尚具有入風口 . M :f葉及包覆其外 a _ u ^ ，徑向具有出風口。出風 濰心式風戶 姐！;又消除離心戎®曰 、馬式/为曰裝置的 離成士屬，用从 風扇運作時所造成的口品立 據本發明之上述目的’長：出—種呈古本曰 離心式風扇 的外殼。外殼的軸 一〜一 β个晰 口處的舌口部’延伸-共鳴腔以減少渦； 二：： 生㈣音。此共鳴腔可以利用像膠軟管等可撓性 成一」字型或「L」型。舌口部是一籀鮑玫从μ 、1作 隔 背 依 字型或「\型。舌口部是一種網格結構，貝^ ;::扇流場之空乳’使共鳴腔不影響風扇内之流場與 照本發明一較佳實施例，當共鳴腔的長度等於 頻率（Blade passing frequency)波長的四分之、」、通過 造成相位差干涉的效果，因而使葉片通過頻率（βι^ ’會 Passing freqUenCy)為主的噪音減低。此葉片通ade 正比於離心式扇葉之葉片數與轉速的相乘值。、頻率係 根據上述可知，應用上述貫施例之共鳴腔，可將此 計與外殼連接，降低離心式風扇之噪音。在舌口 ^鳥腔設 成網格結構，使共鳴腔設計不會干擾離心式風扇部並敦計 而且，共鳴腔利用像膠軟管等可撓性材質製作切，流場。 記型電腦内部不足的空間。 以配合筆 【實施方式】1260485 彡, invention description (2) - The purpose of this invention is to provide a kind of singularity, which is caused by the operation of the wind. According to the above object of the present invention, it is proposed to have a total of J = two days. Centrifugal wind belongs to. A centrifugal fan includes - centrifugal eyebrows ' ‘ and J still has an air inlet. M : f leaves and covered with a _ u ^ , radial air outlet. Out of the wind, heart-shaped style, sister! And eliminate the centrifugation of the 戎 曰 马 马 马 马 马 马 , , , , , , , , , , , , , 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除 消除shell. The shaft of the outer casing is one to one. The tongue of the outer edge of the tongue is 'extend-resonant cavity to reduce the vortex; two:: the raw (four) sound. The resonance chamber can be made into a "shape" or "L" type by using a flexible hose or the like. The mouth of the tongue is a 籀Bao Mei from μ, 1 as a back-back type or "\-type. The tongue is a kind of grid structure, shell ^ ;:: empty air of the fan flow field" so that the resonance chamber does not affect the fan The flow field inside and the preferred embodiment of the present invention, when the length of the resonance cavity is equal to four quarters of the wavelength of the "banding passing frequency", by causing the effect of phase difference interference, the blade passing frequency (βι^ 'Passing freqUenCy' is dominated by noise reduction. The blade pass ade is proportional to the multiplication of the number of blades of the centrifugal fan blade and the rotational speed. Frequency According to the above, the resonance chamber of the above-described embodiment can be used to connect the meter to the casing to reduce the noise of the centrifugal fan. In the tongue mouth, the bird cavity is framed so that the resonance cavity design does not interfere with the centrifugal fan section. Moreover, the resonance cavity is made of a flexible material such as a rubber hose to make a cut and flow field. Keep in mind the lack of space inside the computer. To match the pen [embodiment]
第8頁 五、發明説明（3) s丑 了解決噪音1 =熱兩難的議題，本發明提出一種具有共 鳴式消音展 、、A \風扇。根據實驗結果，本發明發現 納逛外殻之離:風扇’最大的嗓音來源來自於渦流與蝸 贺外殼古口部的陳擦。因此，本發明提出一種以共鳴腔消 i的方法’藉以ϊ;γ桑音問題。 26之葉，· _ ------〇 “ -----…， 例如是離心式扇葉2 6之葉片通過頻率波長的四分之 上述的葉片通過頻率係正比於該離心式扇葉之葉片數 與轉速的相乘值’舉例而言，葉片通過頻率通常係以低中 請參照第2 Α圖’二綠不依照本發明一較佳實施例的一種具 字变共鳴腔之離心式風扇示意圖。圖中繪示一種具 有媧蜇流道25之離心式風扇。當離心式扇葉26以逆時針的 方向旋轉’在舌口部2 2處，渦流摩擦所產生的嗓音分貝數 最大。因此’本發明貫施例自外殼2 4之舌口部2 2，向外延 伸設計，共鳴腔2〇。共鳴腔2 0之長度D係依據離心式扇葉 片通過頻率（Blade passing frequency)波長所制 ，.立魏心式扁螢路u、文、ra & &、丄^> 定 音為主^ , ^參照第⑼圖，其繪示依照本發明一較佳實施例的一種共 ΰ >、也音的原理 鳴腔蝻曰旧 〜 頻率。 參照第2Β圖 .η〜 一 因而使济，， ’、1肢ώ υ此…、、 3 0 (位於舌口部2 2，見第4圖）隔開與風扇流場之空 ^ w裱腔2 0不影響風扇内之流場與昔厭^ c 構3 u、'丨> … ，硐胤嘴4工 使共鳴腔2 〇不影響風扇内之流場與背壓分布。共鳴腔 β谈釀軟管等可撓性材質製作，以-X „ > ^带碰 消音的原理。共鳴腔20中噪音的入射波28Α與反射波 28Β，當共鳴腔2〇之長度等於葉片通過頻率波長的四分之 時，會造成入射波2 8 Α與反射波2 8 Β相位差干涉的效果， 葉片通過頻率為主的噪音減低。共鳴腔2 〇並以網格 、/μ於音口部2 2，見第4圖）隔Pd盥e @ ^ ·β i w 顧，仗穴”V， ，之刀、呷。穴阿似 I玎利用橡膠軟管等可撓性材質製作，以配合筆記塑電腦 1260485 —— ---------——— ___________ 五、發明說明（4) ^ ^^ 内部不足的空間。上述共鳴腔2 0之共鳴頻率及所能衰減的 分貝值，係與共鳴腔2 〇體積、網格結構3 0開孔面積、網才久 結構3 0開孔數目、以及網格結構3 0的厚度相關，透過不^ 的共鳴腔2 0與網格結構3 〇設計，可得最佳的頻率與衰減 量，使風量與噪音之間取得最佳的平衡點。 請參照第3圖，繪示依照本發明另一較佳實施例的一種具 「L」型共鳴腔之離心式風扇示意圖。圖中繪示一種具有 蝸型流道2 5之離心式風扇。當離心式扇葉2 6以逆時針的方 向旋轉，在舌口部2 2處，渦流摩擦所產生的噪音分貝數最 大。因此，本實施例自外殼2 4之舌口部2 2，向外延伸設計 一共鳴腔2 0。本實施例之共鳴腔2 0配合外殼2 4之外型，設 計在外殼2 4之外園。 & 上述的實施例主要用以消除以低中音為主頻率成分之。喿 音’因為入射高頻與共鳴頻率一致時，其音量可能因共喝 而降低，其衰減特性以共鳴頻率為中心而形成山型 (haystack)。共鳴腔之共鳴頻率和，衰減之分貝值與共鳴腔 之體積、網格開孔面積、孔數以及網格厚度有關。藉由不 同的共鳴腔與網格形狀設計可以得到最佳的頻率和衰減 量，使風量與噪音之間取得最佳的平衡點。 請參照第4圖’其繪示依照本發明一較佳實施例的離心式 風扇之外殼的示意圖。圖中繪示外殼2 4之入風口 2 9和出風 口 2 7。入風口 2 9位於離心式扇葉2 6的軸向；出風口 2 7位於 離心式扇葉2 6的徑向。舌口部2 2的網格結構並放大如右邊 的附圖。Page 8 V. Invention Description (3) s ugly to solve the problem of noise 1 = hot dilemma, the present invention proposes a resonance silencer, A \ fan. Based on the experimental results, the present invention found that the source of the fan's separation is: the fan's largest source of arpeggio comes from the eddy currents and the old mouth of the worm casing. Therefore, the present invention proposes a method of "resonating cavity elimination" by means of ϊ; gamma mulberry problem. 26 leaves, · _ ------ 〇 " -----..., for example, the blade of the centrifugal fan blade 6 is proportional to the centrifugal fan by the frequency of the blade passing through the frequency of the quarter. The multiplication value of the number of leaves of the leaf and the rotational speed 'For example, the blade passing frequency is usually low. Please refer to FIG. 2'. Two greens are not centrifuged according to a preferred embodiment of the present invention. Schematic diagram of a fan. The figure shows a centrifugal fan with a choke channel 25. When the centrifugal fan blade 26 rotates in a counterclockwise direction 'at the mouth portion 22, the eddy current friction produces the largest number of decibels. Therefore, the embodiment of the present invention extends outward from the tongue portion 2 2 of the outer casing 24, and the resonance chamber 2〇. The length D of the resonance chamber 20 is based on the centrifugal passing wavelength of the centrifugal fan blade.立立,心心式扁萤路u,文,ra &&,丄^> 音音主^, ^refer to (9), which illustrates a preferred embodiment of the present invention ΰ ΰ >, the principle of the sound also sounds the old ~ frequency. Refer to Figure 2. η ~ one thus makes ,, ', 1 limbs υ ..., ..., 3 0 (located in the tongue 2 2, see Figure 4) separated from the fan flow field ^ w裱 cavity 2 0 does not affect the flow field and the fan厌^ c constituting 3 u, '丨> ... , the 硐胤 nozzle 4 work makes the resonance chamber 2 〇 does not affect the flow field and back pressure distribution in the fan. The resonance chamber β is made of flexible materials such as brewing hose, -X „ > ^The principle of using the silencer. The incident wave 28Α and the reflected wave 28Β of the noise in the resonance cavity 20, when the length of the resonance cavity 2〇 is equal to four quarters of the wavelength of the blade passage frequency, the interference of the phase difference between the incident wave 2 8 Α and the reflected wave 28 8 会 is caused. , the blade passes the frequency-based noise reduction. Resonance cavity 2 〇 and grid, /μ in the mouth part 2 2, see Figure 4) Pd盥e @ ^ ·β iw Gu, acupoint "V,, knife, 呷. Made of flexible material such as rubber hose to match the notebook computer 1260485 —— ---------———— ___________ V. Invention description (4) ^ ^^ Insufficient space inside. The resonance frequency of 20 and the decibel value that can be attenuated are related to the volume of the resonance chamber 2 、, the opening area of the grid structure 30, the number of openings of the network structure 30, and the thickness of the grid structure 30. Through the design of the resonance cavity 20 and the mesh structure 3 ,, the optimal frequency and attenuation can be obtained, and the optimal balance between the air volume and the noise can be obtained. Referring to FIG. 3, the invention is shown in accordance with the present invention. A schematic diagram of a centrifugal fan having an "L" type resonance chamber according to another preferred embodiment. The figure shows a centrifugal fan having a spiral flow path 25. When the centrifugal fan blade 26 rotates in a counterclockwise direction, at the tongue portion 22, the eddy current friction produces the highest number of noise decibels. Therefore, in this embodiment, a resonance chamber 20 is designed to extend outward from the tongue portion 2 2 of the outer casing 24. The resonance chamber 20 of the present embodiment is fitted to the outer casing 24 and is designed to be outside the outer casing 24. & The above embodiments are mainly used to eliminate the low frequency to the main frequency component.喿 音 “Because the incident high frequency and the resonance frequency are the same, the volume may decrease due to the total drinking, and the attenuation characteristic forms a haystack centering on the resonance frequency. The resonant frequency of the resonance cavity and the decibel value are related to the volume of the resonance cavity, the mesh opening area, the number of holes, and the thickness of the mesh. By using different resonance chambers and mesh shape design, the best frequency and attenuation can be obtained to achieve the best balance between air volume and noise. Referring to Figure 4, there is shown a schematic view of an outer casing of a centrifugal fan in accordance with a preferred embodiment of the present invention. The air inlet 2 9 and the air outlet 27 of the outer casing 24 are shown. The air inlet 2 9 is located in the axial direction of the centrifugal fan blade 26; the air outlet port 27 is located in the radial direction of the centrifugal fan blade 26. The mesh structure of the tongue portion 2 2 is enlarged and the drawing is as shown on the right.
第10頁 1260485 五、發明說明（5) 根據上述本發明的實施例，應用上述實施例之共鳴腔，可 將共鳴腔設計與外殼連接，降低離心式風扇之噪音。在舌 口部並設計成網格結構，使共鳴腔設計不會干擾離心式風 扇之流場。而且，共鳴腔利用像膠軟管等可撓性材質製 作，以配合筆記型電腦内部不足的空間。 雖然本發明已以一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潤飾，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。Page 10 1260485 V. Inventive Description (5) According to the embodiment of the present invention described above, by applying the resonance chamber of the above embodiment, the resonance chamber design can be connected to the outer casing to reduce the noise of the centrifugal fan. Designed in a mesh structure at the mouth of the tongue, the resonance chamber design does not interfere with the flow field of the centrifugal fan. Moreover, the resonance chamber is made of a flexible material such as a rubber hose to match the insufficient space inside the notebook. Although the present invention has been described above in terms of a preferred embodiment, it is not intended to limit the invention, and it is obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.
第11頁 1260485 圖式簡單說明 為讓本發明之上述和其他目的、特徵、和優點能更明顯易 懂，下文特舉一較佳實施例，並配合所附圖式，作詳細說 明如下： 第1圖係繪示習知的一種具蝸型外殼之離心式風扇示意 圖； 第2A圖係繪示依照本發明一較佳實施例的一種具「一」字 型共鳴腔之離心式風扇示意圖； 第2 B圖係繪示依照本發明一較佳實施例的一種共鳴腔消音 的原理； 第3圖係繪示依照本發明另一較佳實施例的一種具「L」型 共鳴腔之離心式風扇示意圖；以及 第4圖係繪示依照本發明一較佳實施例的離心式風扇之外 殼的示意圖。 【元件代表符號簡單說明】 14 外 殼 15 /1¾ 流 (vortex) 16 離 心 式扇葉 18 空 氣 20 共 鳴 腔 22 舌 D 部The above and other objects, features, and advantages of the present invention will become more apparent and understood. 1 is a schematic view of a centrifugal fan with a volute casing; FIG. 2A is a schematic view of a centrifugal fan having a "one" type resonance cavity according to a preferred embodiment of the present invention; 2B is a schematic diagram of a resonance cavity silencer according to a preferred embodiment of the present invention; FIG. 3 is a perspective view of a centrifugal fan having an "L" type resonance cavity according to another preferred embodiment of the present invention. FIG. 4 is a schematic view showing the outer casing of a centrifugal fan in accordance with a preferred embodiment of the present invention. [Simplified description of component symbol] 14 Housing 15 /13⁄4 Flow (vortex) 16 Centering fan blade 18 Air 20 Resonance cavity 22 Tongue D
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