200946004 .九、發明說明： 【發明所屬之技術領域】 本發明涉及一種散熱風扇，尤指一種散熱風扇之扇框。 【先前技術】 隨著電子技術之飛速發展，中央處理器等發熱電子元 件運行速度越來越快，其運行時產生之熱量亦相應增加， 為將該等熱量散發出去以保障電子元件正常運行，業界採 ❹用風扇對電子元件進行散熱。習知風扇一般包括一扇框、 一定子及一轉子。扇框包括一圓盤狀基座、一收容轉子之 外框及連接該基座與外框之數根棒狀肋條。基座中央凸設 一中空中柱，軸承收容於其中，定子套設於中柱上。轉子 包括一輪轂，環設於輪轂外週之數片扇葉，貼設於輪轂内 壁之永久磁鐵，一轉軸自輪轂中央垂直向下延伸形成一自 由端。組合時，轉軸穿設於軸承内，定子收容於輪轂内。 ©通電時，定子產生之磁場與轉子之永久磁鐵作用，使轉子 持續運轉，產生風力將熱量散發出去。為改善散熱效果， 業界採用了用靜葉替代棒狀肋條之做法以引導氣流及增大 靜壓，然此種結構在實際應用時，會伴隨著極大動壓損失， 尤其在罪近基座處，在靜葉吸力面產生邊界層剝離現象， 故消耗掉大量能量，造成散熱效率損失。 【發明内容】 鑒於此，有必要提供一種可有效減少氣流邊界層剝離 5 200946004 \現象，減少動壓損失之扇框及採用該扇框之散熱風扇。 種扇框，包括一基座及一外框，外框之軸向兩侧分 別形成一入風口及一出風口，基座設置於出風口處，基座 包括底面及由底面週緣向上延伸並圍繞底面之一側壁， 複數靜葉連接於外框與基座之侧壁之間，該侧壁之外徑沿 入風口向出風口方向逐漸減小。 種散熱風扇，包括一基座、一定子、一轉子及一外 ©框，定子及轉子收容於外框内，夕卜框之轴向兩侧分別形成 一入風口及一出風口，基座設置於出風口處，基座包括一 底面及由底面週緣向上延伸並圍繞底面之一侧壁，複數靜 葉連接於外框與基座侧壁之間，該侧壁之外徑沿入風口向 出風口方向逐漸減小。 該散熱風扇中，基座侧壁之外徑沿入風口向出風口方 向逐漸減小，從而在外框與基座之側壁之間形成漸擴形流 ©道’有效地減少氣㈣界層_現象，降減流動壓損失， 從而提高風扇散熱效率。 【實施方式】 請一並參閱圖i及圖2,該風扇包括一扇框1〇、一定子 20、一轉子30及一對軸承4〇。 «玄扇忙10呈方形’其中央形成一通孔以容置定子及 轉子30’通孔於扇框10之軸向兩侧分別形成一入風口 口及 出風口 18。於出風口 18一側形成一頂面開口式圓台形基 6 200946004 .座12，該基座12包括一圓形底面120及由底面120外圓週向 上延伸並圍繞該底面120之一圓台形侧壁122，該側壁122之 外徑沿入風口 17向出風口 18方向逐漸減小。該側壁122之週 邊等間隔環設有複數靜葉16，靜葉16呈放射狀，每一靜葉 16包括一近端與一遠端，該近端與基座12之侧壁122相連， 該遠端與扇框10之框體内壁102相連。基座12中央朝入風口 17侧凸設一中柱14，其中央形成一中心孔140。中心孔140 D 兩端分別形成一内徑大於中心孔140之開口 142以容置軸承 40 ° 定子20套設於中柱14之上，其包括一定子鐵心24、纏 ‘繞於定子鐵心24上之線圈26及與線圈26電性連接以對線圈 26供電之電路板22。該定子鐵心24由複數層矽鋼片疊設而 成，定子鐵心24中央形成一圓環部，其内徑與中柱14之外 徑相當以供中柱14穿設，根據需要，自圓環部外緣延伸適 ©當數量極爪。兩絕緣片28分別安裝於定子上下兩侧，所述 絕緣片28由塑膠材料組成，將纏繞於定子鐵心24極爪上之 線圈26與定子鐵心24分離，從而達到將兩者絕緣之功效。 該轉子30包括一環形輪轂32、一貼設於輪轂32内壁之 永久磁鐵38以及環設於輪轂32週邊之複數扇葉34，輪轂32 中央設有一軸座324，一轉軸36自軸座324垂直向下延伸形 成一自由端。所述轉軸36靠自由端一侧形成一凹槽360。所 述永久磁鐵38沿圓週方向交替形成N、S極，其極性呈對稱 7 200946004 - 分佈。 組裝時，定子20套設於中柱14之上，車由承4〇收容於中 柱14兩端之開口 142内，轉轴36收容於軸承4〇内，一盤形彈 簣套設於轉軸36之上夾設於軸座324與中杈14上端之軸承 40之間。所述彈簧底端直徑較小，抵靠於轴承4〇内環上， 其頂端直徑較大’抵靠於抽座3 24末端上。一扣環套設於轉 轴36自由端之凹槽360上，用以限制轉子30之轴向運動。該 ❹風扇工作時，定子線圈26產生感應磁場，所述感應磁場與 轉子30之永久磁鐵38相互作用持續.驅動轉子3〇旋轉，轉子 30旋轉時，其扇葉34將入風口 17端氣流壓至出風口 18，基座 12呈圓台形使氣流流過之截面積逐漸增大，形成漸擴形流 道，有利於減少於靜葉16之吸力面162產生之邊界層剝離現 象’減少氣流動壓損失，提高風扇散熱效率。 圖3及圖4所示為本發明之第二實施例，本實施例之基 ❹座312亦呈圓台形，複數靜葉316環設於基座312週邊，其遠 端與扇框310之樞體内壁302相連。本實施例與前述實施例 不同之處在於：其靜葉316高度沿徑向變化，靜葉316於靠 近基座312之近端之高度小於其遠端之高度，靜葉316之遠 端與基座312之底面320基本齊平，靜葉316與基座312相連 之下端點366高於基座312之底面320。該實施方式中，基座 312同樣呈漸縮形設計，使風扇形成漸擴形流道，減少葉片 316與氣流產生邊界層剝離現象。另，由於越靠近基座312 8 200946004 處越易產生邊界層剝離現象，故減小靠近基座312處靜葉 316之高度，使壓力面之氣流及時吹走吸力面Μ?之氣 流，防止邊界層剝離現象產生。 可以理解地，基座不限於圓台形，只要使風屬形成漸 擴形流道’其還可設計為圓錐形、弧形、流線形或二次曲 Λ形荨圖5所示為本發明第三實施例，該風扇基座512之 軸向截面為二次曲線形，該風扇基座512週邊之流道截面沿 ❹入風口 517向出風口 518方向逐漸擴大，亦能有效減少葉片 516及體產生邊界層剝離現象咸少風壓損失。 圖6所不為本發明之第四實施例，於本實施例中，基座 612之軸向截面同樣為二次曲線形，該實施例與第三實施例 不同之處在於：環設於基座612週邊之靜葉616之高度沿徑 向變化，靜葉616於靠近基座612之近端之高度小於其遠端 之南度，靜葉616遠端與基座612之底面620基本齊平，靜葉 ❹616與基座612相連之下端點666高於基座612之底面620。 圖7所示為本發明之第五實施例，該實施方式中基座 712之側壁722靠近出風口718一端為圓台形，然其靠近入風 口 717—端仍為圓柱形。可以理解地，該基座712之側壁722 靠近出風口718—端還可設計為圓錐形、弧形、流線形或二 次曲線形等。 圖8所示為本發明之第六實施例，於本實施例中，基座 812之形狀與第五實施例中相同，該基座8之侧壁822於靠 200946004 近出風口 818—端呈漸縮形，然其靠近入風口 817—端為圓 柱形，該實施例與第五實施例不同之處在於：該風扇之靜 葉816之高度沿徑向變化，靜葉816於靠近基座812之近端之 高度小於其遠端之高度，靜葉816之遠端與基座812之台於 基座812之底面820。 綜上所述，本發明確已符合發明專利之要件，遂依法 提出專利申請。惟，以上所述者僅為本發明之較佳實施方 ❹式，自不能以此限制本案之申請專利範圍。舉凡熟悉本案 技藝之人士援依本發明之精神所作之等效修飾或變化，皆 ' 應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1為本發明風扇之第一實施例之剖面示意圖。 圖2為圖1中扇框之立體示意圖。 圖3為本發明風扇之第二實施例之剖面示意圖。 Q 圖4為圖3中扇框之立體示意圖。 圖5為本發明風扇之第三實施例之剖面示意圖。 圖6為本發明風扇之第四實施例之剖面示意圖。 圖7為本發明風扇之第五實施例之剖面示意圖。 圖8為本發明風扇之第六實施例之剖面示意圖。 【主要元件符號說明】 扇框 10、310 框體内壁 102、302 基座 12、312、512、612、712、812 200946004 底面 120、320、620、820 侧壁 122、722、822 中柱 14 中心孔 140 開口 142 靜葉 16 > 316 > 516 > 616 吸力面 162、362 入風口 17、517、717 ' 817 出風口 18 、 518 、 718 ' 818 定子 20 電路板 22 定子鐵心 24 線圈 26 絕緣片 28 轉子 30 輪轂 32 軸座 324 扇葉 34 轉軸 36 凹槽 360 壓力面 364 下端點 366、666 ' 866 永久磁鐵 38 轴承 40200946004. Nine, invention description: [Technical Field] The present invention relates to a heat dissipation fan, and more particularly to a fan frame of a heat dissipation fan. [Prior Art] With the rapid development of electronic technology, the heat-generating electronic components such as the central processing unit are running faster and faster, and the heat generated during operation is correspondingly increased, so as to dissipate the heat to ensure the normal operation of the electronic components. The industry uses fans to dissipate heat from electronic components. Conventional fans generally include a frame, a stator and a rotor. The fan frame includes a disc-shaped base, an outer frame for receiving the rotor, and a plurality of rod-shaped ribs connecting the base and the outer frame. A central air column is protruded from the center of the base, the bearing is received therein, and the stator is sleeved on the center pillar. The rotor includes a hub, a plurality of blades disposed on the outer circumference of the hub, and a permanent magnet attached to the inner wall of the hub. A rotating shaft extends vertically downward from the center of the hub to form a free end. When combined, the rotating shaft is disposed in the bearing, and the stator is received in the hub. © When energized, the magnetic field generated by the stator acts on the permanent magnet of the rotor, causing the rotor to continue to run, generating wind to dissipate heat. In order to improve the heat dissipation effect, the industry adopts the method of replacing the rod ribs with vanes to guide the airflow and increase the static pressure. However, in practical applications, this structure is accompanied by great dynamic pressure loss, especially at the sin near the base. The boundary layer peeling phenomenon occurs on the suction surface of the stationary blade, so that a large amount of energy is consumed, resulting in loss of heat dissipation efficiency. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a fan frame which can effectively reduce the boundary layer peeling of the air flow, and reduce the dynamic pressure loss, and a cooling fan using the same. The fan frame includes a base and an outer frame. The axial sides of the outer frame respectively form an air inlet and an air outlet. The base is disposed at the air outlet. The base includes a bottom surface and extends upward from the periphery of the bottom surface and surrounds One side wall of the bottom surface, the plurality of vanes are connected between the outer frame and the side wall of the base, and the outer diameter of the side wall gradually decreases toward the air outlet along the air inlet. The heat dissipation fan comprises a base, a stator, a rotor and an outer frame. The stator and the rotor are received in the outer frame, and an air inlet and an air outlet are respectively formed on the axial sides of the outer frame. At the air outlet, the base includes a bottom surface and a side wall extending upward from the periphery of the bottom surface and surrounding one of the bottom surfaces, and a plurality of vanes are connected between the outer frame and the side wall of the base, and the outer diameter of the side wall is directed along the air inlet The direction of the tuyere gradually decreases. In the heat dissipation fan, the outer diameter of the side wall of the base gradually decreases toward the air outlet along the air inlet, thereby forming a divergent flow path between the outer frame and the side wall of the base to effectively reduce the gas (four) boundary layer _ phenomenon , reduce the flow pressure loss, thereby improving the fan cooling efficiency. [Embodiment] Referring to Figures i and 2 together, the fan includes a frame 1 〇, a stator 20, a rotor 30, and a pair of bearings 4 〇. The "small fan is 10 squares" has a through hole formed therein to accommodate the stator and the rotor 30'. The through hole defines an air inlet port and an air outlet 18 on both axial sides of the fan frame 10. A top open-faced truncated base 6 is formed on the side of the air outlet 18 . The base 12 includes a circular bottom surface 120 and a truncated sidewall 122 extending upward from the outer circumference of the bottom surface 120 and surrounding the bottom surface 120 . The outer diameter of the side wall 122 gradually decreases toward the air outlet 18 along the air inlet 17 . A plurality of vanes 16 are disposed on the periphery of the side wall 122, and the vanes 16 are radially. Each vane 16 includes a proximal end and a distal end. The proximal end is connected to the side wall 122 of the base 12. The distal end is connected to the inner wall 102 of the frame of the fan frame 10. A center pillar 14 is protruded from the center of the base 12 toward the air inlet port 17, and a center hole 140 is formed in the center thereof. An opening 142 having an inner diameter larger than the central hole 140 is formed at each end of the center hole 140 D to receive the bearing 40 °. The stator 20 is sleeved on the center pillar 14 and includes a stator core 24 and wound around the stator core 24 . The coil 26 and the circuit board 22 electrically connected to the coil 26 to supply the coil 26 are provided. The stator core 24 is formed by stacking a plurality of layers of silicon steel sheets, and an annular portion is formed in the center of the stator core 24. The inner diameter of the stator core 24 is equivalent to the outer diameter of the center pillar 14 for the center pillar 14 to pass through, as needed, from the annular portion. The outer edge extends as the number of extreme claws. The two insulating sheets 28 are respectively mounted on the upper and lower sides of the stator. The insulating sheet 28 is made of a plastic material, and the coil 26 wound around the pole claws of the stator core 24 is separated from the stator core 24, thereby achieving the effect of insulating the two. The rotor 30 includes an annular hub 32, a permanent magnet 38 attached to the inner wall of the hub 32, and a plurality of blades 34 disposed around the periphery of the hub 32. A hub 324 is disposed in the center of the hub 32. A shaft 36 is perpendicular to the axle housing 324. Extending downwardly to form a free end. The rotating shaft 36 forms a groove 360 on the free end side. The permanent magnets 38 alternately form N and S poles in the circumferential direction, and their polarities are symmetric 7 200946004 - distributed. During assembly, the stator 20 is sleeved on the center pillar 14, and the vehicle is received by the bearing 4 in the opening 142 at both ends of the center pillar 14. The rotating shaft 36 is received in the bearing 4〇, and a disc-shaped magazine is sleeved on the rotating shaft. 36 is sandwiched between the shaft seat 324 and the bearing 40 at the upper end of the middle jaw 14. The bottom end of the spring has a smaller diameter and abuts against the inner ring of the bearing 4, and has a larger diameter at the top end thereof abutting against the end of the suction seat 32. A buckle is sleeved on the recess 360 of the free end of the shaft 36 for limiting the axial movement of the rotor 30. When the fan is in operation, the stator coil 26 generates an induced magnetic field that interacts with the permanent magnet 38 of the rotor 30. The rotor 3 is driven to rotate. When the rotor 30 rotates, the blade 34 presses the airflow at the air inlet 17 end. To the air outlet 18, the base 12 has a truncated cone shape to gradually increase the cross-sectional area through which the airflow flows, forming a divergent flow passage, which is advantageous for reducing the boundary layer peeling phenomenon generated by the suction surface 162 of the vane 16 to reduce the air flow. Pressure loss, improve fan cooling efficiency. 3 and FIG. 4 show a second embodiment of the present invention. The base 312 of the present embodiment also has a truncated cone shape. The plurality of vanes 316 are disposed around the base 312, and the distal end thereof is pivoted to the frame 310. The inner wall 302 is connected. This embodiment differs from the previous embodiment in that the height of the vane 316 varies radially, and the height of the vane 316 near the proximal end of the pedestal 312 is less than the height of the distal end thereof, and the distal end of the vane 316 is at the distal end. The bottom surface 320 of the seat 312 is substantially flush, and the end 366 of the stationary blade 316 is coupled to the base 312 below the bottom surface 320 of the base 312. In this embodiment, the base 312 is also tapered, so that the fan forms a divergent flow path, which reduces the boundary layer peeling phenomenon between the blade 316 and the airflow. In addition, since the boundary layer peeling phenomenon is more likely to occur near the pedestal 312 8 200946004, the height of the vane 316 near the pedestal 312 is reduced, so that the air flow of the pressure surface blows away the airflow of the suction surface in time to prevent the boundary. Layer peeling occurs. It can be understood that the base is not limited to a truncated cone shape, as long as the wind is formed into a divergent flow passage 'which may also be designed as a conical shape, an arc shape, a streamline shape or a quadratic curve shape. In the third embodiment, the axial cross section of the fan base 512 is a quadratic curve. The cross section of the flow path around the fan base 512 is gradually enlarged along the inflow vent 517 toward the air outlet 518, and the blade 516 and the body can be effectively reduced. The boundary layer peeling phenomenon occurs and the wind pressure loss is less. FIG. 6 is not a fourth embodiment of the present invention. In the embodiment, the axial cross section of the pedestal 612 is also a quadratic curve. The difference between this embodiment and the third embodiment is that the ring is disposed on the base. The height of the vane 616 around the seat 612 varies radially, the height of the vane 616 near the proximal end of the base 612 is less than the south of the distal end thereof, and the distal end of the vane 616 is substantially flush with the bottom surface 620 of the base 612. The end point 666 of the stationary blade 616 connected to the base 612 is higher than the bottom surface 620 of the base 612. Fig. 7 shows a fifth embodiment of the present invention. In this embodiment, the side wall 722 of the base 712 has a truncated cone shape near one end of the air outlet 718, but is still cylindrical near the inlet port 717. It can be understood that the side wall 722 of the base 712 is close to the air outlet 718 - the end can also be designed to be conical, curved, streamlined or quadratic. FIG. 8 shows a sixth embodiment of the present invention. In this embodiment, the shape of the base 812 is the same as that in the fifth embodiment, and the side wall 822 of the base 8 is adjacent to the air outlet 818 at the end of 200946004. The tapered shape is close to the air inlet 817—the end is cylindrical. This embodiment is different from the fifth embodiment in that the height of the vane 816 of the fan varies in the radial direction, and the vane 816 is close to the base 812. The height of the proximal end is less than the height of the distal end, and the distal end of the vane 816 and the base 812 are placed on the bottom surface 820 of the base 812. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a first embodiment of a fan of the present invention. 2 is a perspective view of the fan frame of FIG. 1. Figure 3 is a cross-sectional view showing a second embodiment of the fan of the present invention. Q Figure 4 is a perspective view of the fan frame of Figure 3. Figure 5 is a cross-sectional view showing a third embodiment of the fan of the present invention. Figure 6 is a cross-sectional view showing a fourth embodiment of the fan of the present invention. Figure 7 is a cross-sectional view showing a fifth embodiment of the fan of the present invention. Figure 8 is a cross-sectional view showing a sixth embodiment of the fan of the present invention. [Main component symbol description] Fan frame 10, 310 frame inner wall 102, 302 base 12, 312, 512, 612, 712, 812 200946004 bottom surface 120, 320, 620, 820 side wall 122, 722, 822 center column 14 center Hole 140 opening 142 vane 16 > 316 > 516 > 616 suction surface 162, 362 air inlet 17, 517, 717 '817 air outlet 18, 518, 718 '818 stator 20 circuit board 22 stator core 24 coil 26 insulation Sheet 28 Rotor 30 Hub 32 Shaft seat 324 Blade 34 Rotary shaft 36 Groove 360 Pressure surface 364 Lower end 366, 666 ' 866 Permanent magnet 38 Bearing 40
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