1284708 九、發明說明： 【發明所屬之技術領域】 本發明涉及散熱風扇，尤係一種散熱風扇之扇葉結構。 【先前技術】 近年來隨著電子産業之發展’電子元件之性能不斷提升，運算速 度越來越快，其内部晶片組之運算速度不斷提升，晶片數量不斷增加， 晶片工作時所散發之熱量也相應增加，如果不將這些熱量及時散發出 去，將極大影響電子元件之性能，使電子元件之運算速度降低，隨著 熱置之不斷累積，還可能燒毁電子元件，因此必須對電子元件進行散 熱0 狀"、、風屬在現p白#又電子元件散熱中扮演著重要角色，其中，風爲 扇葉對風扇産生之風壓和風量有較大影響。現有風扇扇葉包括一^ 及位於輪較周緣之多數葉片，其中，葉片内端分別固定於輪較之外圓又 =上，以輪轂爲中心呈歸狀排列，工作時，葉片旋轉帶動周圍空氣 抓動’産生氣流。隨著電子元件散熱量之增加，f要風扇工作時 2大之風壓和風量，·，料—直期望設料 = 壓和風量找4«。 践知大風 【發明内容】 構。本發明之目的係提供一種能産生較大風壓和風量之風扇葉片結 本發明風扇扇葉結構，輪較頂面設有第二葉片 加扇葉產生之風壓和風量， 二 ^弟一葉片可增 生較大之風堡和風量。 〃 x 口構之風扇丄作時能産 1284708 【實施方式】 下面參照附圖結合實施例對本發明作進一步之說明。 睛參閱第一圖和第二圖，本發明風扇扇葉10包括一輪轂12、環設 於輪轂π周緣之辣第—葉# w及位於輪轂12頂面之複數第二葉片 其中，第一葉片14内端分別結合於輪轂12之外圓周上，沿輪轂 12周緣呈放射狀排列。輪轂12之頂面低於第一葉片W之最高點，在 輪轂12之頂面中心設有一圓柱形凸台18，凸台18中部設有一圓柱形 ，工孔22，該加工孔22爲加工扇葉1Q時之雜孔，凸台18周緣和輪 毅U之頂面間爲過渡曲面連接。 弟二葉片16爲彎曲之肋條狀結構，在輪轂12頂面沿凸台18之周 緣向輪較12周緣延伸，相鄰二第二葉片16間形成一導風槽2〇。整體 上，第二葉片16與輪轂12之頂面傾斜連接，每一第二葉片16之表面 ”輪轂12頂面之夾角沿第二葉片16之延伸方向自一銳角連續增加 ^度角太即，上_靠近凸台18周緣時最小，在第二葉片、16向外 毛政之方向上’上述夾肢漸增加，直至輪較12邊緣，上述夾角 =2邊緣爲直角。這樣，使得第二葉片16之表面呈—扭曲之弧面。 :種吏空氣，過程中受到較小之阻力，從而得到更大風 里。弟一釗16之頂邊162至輪較12頂面之垂直高度由輪較 到輪轂12周緣逐漸降低，從俯視圖第一圖中看，每 致呈三角形。 16大 1284708 低舰，並隨第-料14之旋轉向下運動，增加第_^ΐ4單位時 間内產生之氣流量’加大風扇扇葉1G工作時産生之風麵風量。 一第二葉片16與第一葉片14之旋向一致時（此種情況圖未示），第 二葉片16和第-葉片14工作產生之氣流方向相同，第二葉片祕產生 之氣流直接沿著導風槽20流向第-葉片14,和第—葉片14產生之氣 流-起向下運動’實際上相當於增加第—葉片14之尺寸，使=位時^ 内從，-葉片W處流出之氣流量增大，增加風扇扇葉1G產生之風壓 和風量。 本發明風扇扇葉10之輪轂頂面設置有第二葉片Μ，該第二葉 片I6增加扇葉10産生之顏和風量，使具有本發明扇葉1〇結構之風 扇工作時能産生較大之風壓和風量。 、綜上所述，本發明符合發明專利要件，爰依法提出 ^上所述者僅為本發明之較佳實關，舉凡熟悉本案技藝之^士 發鴨神所作之等效修飾或變化H涵蓋於町之巾請專利 【圖式簡單說明】 第一圖爲本發明風扇扇葉之俯視圖。 第二圖爲本發明風扇扇葉之主視圖。 【主要元件符號說明】 10 物季又 14 第二葉片 162 凸台 20 加工孔 12 16 18 22 扇葉 第一葉片 頂邊 導風槽1284708 IX. Description of the Invention: [Technical Field] The present invention relates to a heat dissipation fan, and more particularly to a fan blade structure of a heat dissipation fan. [Prior Art] In recent years, with the development of the electronics industry, the performance of electronic components has been continuously improved, the computing speed has become faster, the computing speed of the internal chipset has been continuously increased, the number of wafers has been increasing, and the heat generated during the operation of the wafer has also been increased. Correspondingly, if these heats are not dissipated in time, the performance of the electronic components will be greatly affected, and the operation speed of the electronic components will be reduced. As the heat builds up, the electronic components may be burned, so the electronic components must be dissipated. 0-shaped ",, wind belongs to the current p white # and electronic components in the heat dissipation plays an important role, in which the wind is the fan blade has a greater impact on the wind pressure and air volume generated by the fan. The existing fan blade includes a plurality of blades located at a peripheral edge of the wheel, wherein the inner ends of the blades are respectively fixed to the outer circle of the wheel and are upper, and are arranged in a normal manner around the hub. When working, the blade rotates to drive the surrounding air. Grab 'generate airflow. As the heat dissipation of the electronic components increases, f requires two wind pressures and air volumes when the fan is working, and the material is directly expected to set the material = pressure and air volume to find 4«. Practice the wind [invention] The object of the present invention is to provide a fan blade structure capable of generating large wind pressure and air volume. The fan blade structure of the present invention is provided with a wind blade and a wind volume generated by a second blade plus a fan blade on the top surface of the wheel, Can accumulate larger wind castles and air volume. The present invention can be further described with reference to the accompanying drawings with reference to the accompanying drawings. Referring to the first and second figures, the fan blade 10 of the present invention includes a hub 12, a hot first leaf #w ring disposed on the periphery of the hub π, and a plurality of second blades located on the top surface of the hub 12, the first blade The inner ends of 14 are respectively coupled to the outer circumference of the hub 12 and are radially arranged along the circumference of the hub 12. The top surface of the hub 12 is lower than the highest point of the first blade W, and a cylindrical boss 18 is disposed at the center of the top surface of the hub 12. The central portion of the boss 18 is provided with a cylindrical working hole 22, and the working hole 22 is a processing fan. The hole in the 1Q leaf, the periphery of the boss 18 and the top surface of the wheel U are connected by a transition surface. The second blade 16 is a curved rib-like structure, and extends on the top surface of the hub 12 along the periphery of the boss 18 toward the periphery of the wheel 12, and an air guiding groove 2 is formed between the adjacent two second blades 16. Generally, the second blade 16 is obliquely connected to the top surface of the hub 12, and the angle of the surface of each of the second blades 16 "the top surface of the hub 12 is continuously increased from an acute angle along the extending direction of the second blade 16". The upper _ is the smallest when approaching the circumference of the boss 18, and the above-mentioned clamping limb is gradually increased in the direction of the second blade, 16 outward hair, until the wheel is closer to the edge of the 12, the above angle = 2 edge is a right angle. Thus, the second blade 16 is made The surface is a twisted curved surface: the air is plucked, and the process is subjected to less resistance, resulting in a larger wind. The top edge of the 162 to the top of the wheel is the vertical height of the wheel. The circumference of the hub 12 gradually decreases. From the first view of the top view, each triangle is triangular. 16 large 1284708 low ship, and moves downward with the rotation of the first material 14 to increase the gas flow generated in the first unit of time. Increasing the amount of wind surface generated when the fan blade 1G is working. When the second blade 16 is aligned with the first blade 14 (not shown in this case), the second blade 16 and the first blade 14 are operated. The direction of the airflow is the same, and the airflow generated by the second blade is directly along The flow of the air guiding groove 20 to the first vane 14 and the air flow generated by the first vane 14 - the downward movement 'actually corresponds to increasing the size of the first vane 14 so that the inner position of the = position and the inner side of the vane W The air flow rate is increased to increase the wind pressure and the air volume generated by the fan blade 1G. The top surface of the hub of the fan blade 10 of the present invention is provided with a second blade raft, and the second blade I6 increases the color and air volume generated by the blade 10, When the fan having the fan blade structure of the present invention is operated, a large wind pressure and an air volume can be generated. In summary, the present invention meets the requirements of the invention patent, and the above is only the comparison of the present invention. Jiashiguan, the equivalent modification or change H made by the person who is familiar with the skill of the case is covered by the towel of the town. Please patent [Simplified illustration] The first picture is the top view of the fan blade of the invention. The main view of the fan blade of the present invention. [Main component symbol description] 10 season and 14 second blade 162 boss 20 machining hole 12 16 18 22 blade first blade top air guide groove