200413645 玖、發明說明： 【發明所屬之技術領域】 特別是有關其鼓風 本發明係有關離心式風扇與鼓風輪 輪葉片之構形。 【先前技術】 離心式風扇係用於多方面之應用供產生強力之？ =器與增濕裝置均在此等應用範圍中。此等 地“-由電氣馬達轉動之鼓風輪。鼓風輪係安裝於二： ^一通口之殼體内’通過此Π周圍空氣可於鼓風輪内依轴 :由取’然後沿徑地通過鼓風輪，最後經由—渦形體 殼體。 /支風輪本身包含—環狀成列、間隔分開之扇葉或葉片。 葉片典型地成扁平狀並定位於與鼓風輪旋轉轴心成一傾斜 角度之位置。惟某些葉片沿一圓弧彎曲，g圖增進鼓風輪 ϋ率、A效率即用以產生每分鐘立方吸或CFM之氣流所 需瓦數之電氣能量之數量。f曲之鼓風輪葉片在某些應用 中經發現可加強效率至若干程度。惟，較之其他型式之風 扇’離〜式風扇仍缺少效率。 、 口人可見，鬲效率之離心式風扇仍有其需要。本 發明足王要方向在於提供此一型式之風扇。 【發明内容】 万、本U車父佳形式巾，—離心式風扇具有一係安裝供 圍繞-旋轉軸心而旋轉之環狀成列葉片，I —葉片具有〜 凹狀a導表面，其附有一位於接近旋轉軸心之内側部份， 88587 200413645 此邵份具有一比位於離旋轉軸心更遠之外側部份較小之曲 率半徑。 於本發明另一較佳形式中，一離心式風扇，具有一鼓風 輪’以將空氣軸向吸入輪中並徑向地通過其輪，於鼓風輪 内’該成列葉片之前導表面，是以拍擊輪内空氣之角度而 定位’其角度則於接近鼓風輪旋轉軸心之内側緣與於鼓風 輪旋轉軸心遠處之外侧緣之間，以一不一致之比率變換。 【實施方式】 籲 其次詳細參照圖式，顯示有一離心式風扇，其具有一鼓 風輪12，係安裝供於附有一渦形體14之殼體13内旋轉，其 係由一未示之電氣馬達依順時鐘方向予以驅動，如圖1與2 所見者。鼓風輪具有一環狀成列、間隔分開之扇葉或葉片 15。傳統構造與操作之風扇，葉片15之形狀有所省略。當 妓風輪旋轉時，其吸進空氣通過殼體吸入口 17，沿徑地通 過豉風輪，然後經由渦形體14離開殼體。 妓風輪葉片於圖2與3中有較佳之顯示。葉片在此係完全 Ο 相同，並可見到有一凹狀表面作為其前導表面，與一凸表 面作為其後緣表面。每一扇葉具有接近於殼風輪之旋轉軸 ^之内側端或邊緣2〇，與一外側端或邊緣21於軸心之遠側 在此最重要者係凹狀前導表面不僅是一圓弧狀，而是一 更複旅之形狀。吾人可見到有一較小之曲率半徑比其接近 於外側緣21者更接近其較近之邊緣20。 、万、所不之較佳具體實施例中，自外側緣21延伸之表面部 饬係/口 459厘米之半徑R1之圓弧。稍為越過中段至接近之 88587 200413645 側緣20之處，其併入並轉變為一有125厘米之半徑幻之尖銳 曲線。從此處，凹狀前導表面併入一有336厘米半徑汜:最 後邵份。如此，彼等之曲率半徑相對為3比4。 吾人發現，具有此型式之鼓風輪葉片之風扇，較之具有 一致曲率之凹狀前導表面之扇葉，在鼓風效率方面可產生 30%之改善。吾人相信此乃歸因#，所附之拍擊鼓風輪内 空氣之角度，係於接近内側緣處或尖銳狀，而於接近外側 緣處成鈍狀。換言之，高内側拍擊角度係可有效於促成氣 流進入殼體，使正確角度（萬向地）轉入鼓風輪葉片。一旦 此轉換產生時，接近葉片外側緣之較平穩角度易於提供相 對於包力消耗之氣流。情況是否如此尚未經證實。惟效率 <增進已獲證實。當然，曲率之其他程度與長度亦可為之 並確可獒供效率之增進。吾人發現方才經確認具有效能 者係最佳實例。 因此吾人可見，一具有經實質增進效率之離心式風扇今 已#疋i、雖其係以其較佳形式予以顯示與說明，吾人應瞭 解，鼓風輪葉片之前導表面之特有輪廓僅係目前較佳者， =其他輪廓與曲率者亦係可為之，亦可提供增進之風扇效 率’毋須脫離本發明精神與範圍。 【圖式簡單說明】 圖1係將本發明之原理以一較佳形式具體化之離心式風扇 之透視圖。 圖2為風扇一部份之鼓風輪之放大圖。 圖3為鼓風輪其中一葉片之橫剖面圖。 88587 200413645 【圖式代表符號說明】 12 鼓風輪 13 殼體 14 渦形體 15 葉片 17 吸入口 20 内側緣 21 外侧緣 R1 半徑 R2 半徑 R3 半徑 88587200413645 (1) Description of the invention: [Technical field to which the invention belongs] In particular, the invention relates to the blower of the invention. The present invention relates to the configuration of the centrifugal fan and the blade of the blower wheel. [Previous technology] Centrifugal fans are used in a variety of applications for generating strong power? Devices and humidifiers are in these applications. In these places "-the blower wheel rotated by the electric motor. The blower wheel system is installed in the two: ^ one port of the casing 'through this Π surrounding air can be in the blower wheel according to the axis: by take' and then along the diameter The ground passes through the blower wheel, and finally through the scroll body. / The blower wheel itself contains-ring-shaped, spaced apart fan blades or blades. The blades are typically flat and positioned at the center of the rotation axis of the blower wheel At an oblique angle position. However, some blades are curved along an arc, and the g-graph increases the fan rate, and the A efficiency is the amount of electrical energy required to generate the watts required for cubic suction or CFM airflow per minute. F In some applications, the curved fan blades have been found to enhance the efficiency to a certain degree. However, compared to other types of fans, the fan-off fan still lacks efficiency. It can be seen that centrifugal fans with high efficiency are still available The need is. The main direction of the foot king of the present invention is to provide this type of fan. [Summary of the Invention] The U-shaped car fan is a centrifugal fan with a ring mounted for rotation around the axis of rotation. Row of leaves, I — the leaves have ~ A guide surface with an inner portion located near the axis of rotation, 88587 200413645 This portion has a smaller radius of curvature than a portion located farther away from the axis of rotation. Another preferred aspect of the present invention In the form, a centrifugal fan has a blower wheel 'to draw air axially into the wheel and pass it radially through the wheel. Inside the blower wheel' the leading surface of the row of blades is the beater wheel. Positioned by the angle of the air, the angle is changed at an inconsistent ratio between the inner edge close to the center of the rotation axis of the blower wheel and the outer edge far from the center of the rotation axis of the blower wheel. [Embodiment] Call for details Referring to the figure, there is shown a centrifugal fan having a blower wheel 12, which is installed for rotation in a casing 13 with a scroll 14 attached, and is driven by an unillustrated electric motor in a clockwise direction. As seen in Figures 1 and 2. The blower wheel has a ring-shaped, spaced apart fan blade or blade 15. The traditional structure and operation of the fan, the shape of the blade 15 is omitted. When the prostitute wheel rotates, its Inhaled air is sucked through the housing The inlet 17 passes through the wind turbine and then exits the casing through the scroll 14. The vane blades are better shown in Figures 2 and 3. The blades are exactly the same here, and a concave surface can be seen As its leading surface and a convex surface as its trailing edge surface, each blade has an inner end or edge 20 close to the rotation axis of the shell wind wheel, and an outer end or edge 21 on the far side of the axis. The most important thing here is that the concave leading surface is not only a circular arc, but a more complex shape. We can see that a smaller radius of curvature is closer to its closer edge than it is closer to the outer edge 21. 20. In a preferred embodiment, the surface portion extending from the outer edge 21 is a circular arc with a radius R1 of 459 cm / mouth. It slightly crosses the middle section to approach 88587 200413645 side edge 20, It merges and transforms into a sharp curve with a 125 cm radius. From here, the concave leading surface incorporates a radius of 336 cm: the last. In this way, their radius of curvature is relatively 3 to 4. I have found that a fan with this type of blower blade can produce a 30% improvement in blower efficiency compared to a blade with a concave leading surface with a uniform curvature. I believe that this is the attribution #. The angle of the air in the attached blow drum is close to the inside edge or sharp, and it is blunt near the outside edge. In other words, a high inside slap angle is effective in promoting airflow into the housing, turning the correct angle (universally) into the blower blades. Once this transition occurs, a smoother angle near the outer edge of the blade is apt to provide airflow relative to the force consumption. Whether this is the case has not been proven. But efficiency < promotion has been proven. Of course, other degrees and lengths of curvature can also be used and can indeed provide efficiency improvements. I have found that those who have been confirmed to be effective are the best examples. Therefore, we can see that a centrifugal fan with substantially improved efficiency is now # 疋 i. Although it is shown and explained in its preferred form, I should understand that the unique contour of the leading surface of the fan blade is only the current The better, = other contours and curvatures are also available, and can provide improved fan efficiency 'without departing from the spirit and scope of the present invention. [Brief description of the drawings] FIG. 1 is a perspective view of a centrifugal fan embodying the principle of the present invention in a preferred form. Figure 2 is an enlarged view of a blower wheel of a part of a fan. Figure 3 is a cross-sectional view of one of the blades of the blower wheel. 88587 200413645 [Explanation of symbols] 12 blower wheel 13 housing 14 scroll 15 blade 17 suction port 20 inside edge 21 outside edge R1 radius R2 radius R3 radius 88587