九、發明說明： 【發明所屬之技術領域】 發明領域Nine, invention description: [Technical field to which the invention belongs] Field of the invention
本發明係有關於直列式軸流風扇者。 t先前技術:J 發明背景 個人電腦或網路伺服器等電子機器中，設有用以冷卻 框體内部電子零件之冷卻風扇，隨著框體内部電子零件之 女裝达度的日益提南而更加要求提升冷卻風扇的性能。特 別是’在伺服器等較大型的電子機器所搭載的冷卻風扇而 言，會要求高的靜壓且大的風量之特性。對應這樣的要求， 例如，提供沿著預定中心軸在同軸連結2個動翼之直列式輛 流風扇（例如，参考專利文獻1) 【專利文獻1】日本專利公報第3717803號 【發明内容】 發明概要 但是’為了有效地冷卻電子機器内部之電子零件，必 須直接對電子零件供給冷卻空氣。一般的軸流風扇中，因 受葉輪旋轉所伴隨的離心力影響，而有向徑方向往外擴散 的傾向。因此，使用轴流風扇作為冷卻風扇時，因氣流的 擴散’而有無法充分對電子零件供給冷卻空氣的問題。 本發明之目的係鑒於先前技術存在之前述問題點而作 成者’且提供一種限制氣流的流出方向之直列式軸流風 扇，使該直列式轴流風扇之氣流不會向徑方向外擴散。 1356879 為達成上述目的，本發明係一種直列式軸流風扇，包 含：第1葉輪，係具有多數配置在旋轉中心軸周圍之第1翼， 並藉旋轉而產生沿著前述旋轉中心轴方向之氣流者；第1馬 達部，係以前述旋轉中心軸為中心而使前述第1葉輪旋轉 5 者；第2葉輪，係配置成在軸方向上與前述第1葉輪相對並 鄰接，且具有多數配置在旋轉中心軸周圍之第2翼，並藉旋 轉而產生與前述第1葉輪所產生之氣流同方向之氣流者；第 2馬達部，係以前述旋轉中心軸為中心而使前述第2葉輪旋 轉者；筒狀之殼體，係在徑方向上包圍前述第1葉輪與前述 10 第2葉輪者；及多數支持肋，係在前述第1葉輪與前述第2葉 輪之間，以前述旋轉中心軸為中心設成放射狀，各支持肋 的外側前端連接在前述殼體上，以相對於前述殼體至少支 持前述第1馬達部者，前述各支持肋具有面向該支持肋之前 述第1葉輪側之傾斜面，且該傾斜面係傾斜成使任意徑方向 15 截面之前述第1葉輪側端緣較前述第2葉輪側端緣更位於前 述第1葉輪之旋轉方向之上游側，前述傾斜面相對於前述旋 轉中心軸方向之角度與藉前述第1葉輪所產生之氣流相對 於前述旋轉中心軸方向之角度大致相同。 該直列式軸流風扇中，前述第1葉輪之前述各第1翼係 20 傾斜成使翼前緣相對翼後緣位於旋轉方向上，且前述各第1 翼之至少翼後緣與前述支持肋之傾斜面所形成之角度可設 定在100度以下，若該角度設定在80度〜100度的範圍更佳。 又，上述本發明之直列式軸流風扇，其中前述各支持 肋之傾斜面的傾斜角度係形成為從垂直於前述旋轉中心軸 6 1356879 之Γ向的内側至外側逐漸變小者。再者，前述各支持肋 2射狀延伸方向之任一位置處’在以前述旋轉中心軸為 :圓筒面上之截面係可具有與前述延伸方向之其他位 置的戠面相異之形狀。 5㈣ί支持肋從前述第1馬達部侧之最㈣相對垂直前述 及鳍二㈣方向之直線而可向前述第1f輪旋轉方向或 傾斜或彎曲。此時，支持肋傾斜或脊曲之形狀係 ^第1馬達相連結殼_續«舰敎徑方向直 線以外之形狀。 .置 本發明之直列式軸流風扇， 述第1葉輪外周之第！殼體祕、 设體係以包圍前 第2殼體構件所構成。又，其中藉及 第2葉輪外周之 與藉第2馬達部旋轉之第2葉輪係可互相以同 = 可互相以相反之方向旋轉。 亦 15 又，前述各支持肋係由多數第以 肋所構成，該物鱗肋從 料讀第2支持 各第1支持肋之外側前端馬達部設成放射狀， 卜惻別知連接於前述殼體 體支持前物馬㈣吻2支持肋 =述殼 20 成放射狀，各第2支持肋之外側前端連接攻第=達部設 於前述殼體支持前述第2馬達部，且前=7以相對 第2支持肋配置在第1葉輪與第2葉輪之間前述 與前述第2支持肋設置有同― ^第1支持肋 持肋與前述各第2支持肋在前述旋轉中=^^支 觸，構成前述傾斜面。 袖的方向上接 7 =，前述殼職可由在徑方向㈣前述第旧輪並連 夕數第1支持肋之第】殼體構件及包圍徑方向 述第2葉輪並連接前述多數 月1 成。此時，㈣戰雜體構件所構 反方向旋轉。傾係以與“弟1葉輪之旋轉方向相 具有月:另 >種直烈式軸流風扇’包含:第1葉輪，係 :著:：韓t旋轉中心、周圍之第1翼，並藉旋轉而產生 配置成在=迷第1葉輪旋轉者;第2葉輪，係 置成在轴方向上與前迷第i葉輪 配置在旋轉中心__ ^接且具有夕數 1葉輪所產生之氣流同方向之該者ζ轉而產生與前述第 述旋轉中心軸為中心而第第2馬達部’係以前 m, _ 述第2葉輪旋轉者；筒狀之私 多數1=方:上包圍前迷第1葉輪與前述第2葉輪者;： 述=::=:1葉輪與_葉輪之間，以前 接在前述故射狀，各切肋的外側前端連 按在“4上，_對於前述 部者，前述各支持肋且有以 〃支持則述第1馬達 _ 有面向該支持肋之前述第1葉輪心 顺面’㈣傾_仙斜錢任意徑 轉葉方輪:_財料2心_敎㈣料第】The present invention is directed to an in-line axial flow fan. t Prior Art: J Background of the Invention In an electronic device such as a personal computer or a network server, a cooling fan for cooling the internal electronic components of the frame is provided, and the wearer of the electronic parts of the frame is increasingly increased. It is required to improve the performance of the cooling fan. In particular, a cooling fan mounted on a large electronic device such as a servo device requires a high static pressure and a large air volume. In response to such a request, for example, an in-line type flow fan in which two moving blades are coaxially connected along a predetermined central axis is provided (for example, refer to Patent Document 1). [Patent Document 1] Japanese Patent Publication No. 3717803 [Invention] Summary However, in order to effectively cool electronic components inside an electronic device, it is necessary to supply cooling air directly to the electronic components. In a general axial fan, the centrifugal force due to the rotation of the impeller tends to spread outward in the radial direction. Therefore, when an axial fan is used as the cooling fan, there is a problem that the cooling air cannot be sufficiently supplied to the electronic component due to the diffusion of the airflow. The object of the present invention is to provide an in-line axial fan that restricts the outflow direction of the airflow in view of the aforementioned problems of the prior art, so that the airflow of the in-line axial fan does not spread out in the radial direction. 1356879 In order to achieve the above object, the present invention is an in-line axial flow fan comprising: a first impeller having a plurality of first wings disposed around a central axis of rotation, and rotating to generate an air flow along the central axis of rotation The first motor unit rotates the first impeller about the center of the rotation center axis, and the second impeller is disposed adjacent to the first impeller in the axial direction and has a plurality of positions. Rotating the second wing around the central axis and generating a flow in the same direction as the airflow generated by the first impeller by rotation; and the second motor portion rotating the second impeller around the central axis of rotation a cylindrical casing that surrounds the first impeller and the ten second impeller in a radial direction; and a plurality of supporting ribs between the first impeller and the second impeller, wherein the rotation center axis is The center is radially formed, and an outer front end of each of the support ribs is connected to the housing to support at least the first motor portion with respect to the housing, and each of the support ribs has a front surface facing the support rib The inclined surface of the first impeller side is inclined such that the first impeller side end edge of the cross section of the arbitrary radial direction 15 is located on the upstream side of the rotation direction of the first impeller more than the second impeller side end edge. The angle of the inclined surface with respect to the rotation center axis direction is substantially the same as the angle of the airflow generated by the first impeller with respect to the rotation center axis direction. In the in-line axial fan, each of the first wing systems 20 of the first impeller is inclined such that a leading edge of the blade is located in a rotational direction with respect to a trailing edge of the blade, and at least a trailing edge of each of the first wings and the supporting rib The angle formed by the inclined surface can be set to 100 degrees or less, and the angle is preferably set in the range of 80 degrees to 100 degrees. Further, in the in-line axial flow fan of the present invention, the inclination angle of the inclined surface of each of the support ribs is formed to be gradually smaller from the inner side to the outer side perpendicular to the radial direction of the rotation center axis 6 1356879. Further, the position of each of the support ribs 2 in the direction in which the projections are formed may be such that the cross section of the cylindrical surface may have a shape different from the plane of the other position in the extending direction. 5 (4) The support rib is inclined or curved in the direction of rotation of the first f-wheel from the most (four) of the first motor portion side to the straight line in the direction perpendicular to the fin (four). At this time, the shape of the support rib inclination or the curvature of the ridge is the shape of the first motor phase connection case _ continued «the ship 敎 diameter direction straight line. The in-line axial flow fan of the present invention is described as the outer circumference of the first impeller! The housing is secreted and the system is constructed to surround the front second housing member. Further, the second impellers which are rotated by the second motor portion by the outer circumference of the second impeller can rotate in opposite directions with each other. Further, each of the support ribs is formed by a plurality of first ribs which are radially formed from the front end of the second support ribs on the outer side of the first support ribs, and are connected to the shell. The body supports the front horse (four) kiss 2 support ribs = the shell 20 is radial, and the second support ribs are connected to the outer end of the second support rib. The upper portion is provided in the housing to support the second motor portion, and the front = 7 The second support rib is disposed between the first impeller and the second impeller, and the second support rib is provided with the first support rib holding rib and the second support rib in the rotation. Forming the aforementioned inclined surface. In the direction of the sleeve, 7 =, the shell member can be connected to the second impeller in the radial direction (4) of the first old wheel and the first support rib of the first support rib, and the second impeller is connected to the radial direction. At this time, (4) the warfare component is rotated in the opposite direction. The tilting system has a month with the rotation direction of the "Xi's impeller: another > a kind of straight-line axial flow fan" includes: the first impeller, the system::: Han t rotation center, the first wing around, and borrowed Rotating to generate a first impeller rotation; the second impeller is arranged to be in the axial direction with the first impeller arranged at the center of rotation __^ and having the imaginary number 1 impeller The direction of the rotation is centered on the rotation center axis, the second motor portion is before the m, and the second impeller is rotated; the private majority of the tube is 1 = square: the front is surrounded by the former 1 impeller and the second impeller;: ==::=:1 between the impeller and the _impeller, previously connected to the above-mentioned shot, the outer front end of each rib is pressed at "4, _ for the aforementioned Each of the support ribs described above is supported by a first motor _ having a first impeller surface facing the support rib (four) tilting _ 仙 oblique money arbitrary diameter turning leaf square wheel: _财料2心_敎(four) material number]
轉方向之均側，M 氣流方向與前述傾斜面大致平行。 Λ風 本發种’不只提昇直列式抽流風扇之風量特 量及靜厂堅）’亦可抑制從直列式轴流風扇排出之氣流朝徑方 向向外擴散。藉此，從直列式軸流風扇排出之氣流可有效 率地供給至電子零件等被冷卻體，而可提升冷卻效率。 圖式簡單說明 【第1圖】顯示有關於本發明之一實施形態的直列式軸流風 扇之斜視圖。 【第2圖】第1圖之直列式軸流風扇之分解斜視圖。 【第3圖】第1圖之直列式轴流風扇之縱截面圖。 【第4圖】第1圖之直列式轴流風扇之第1軸流風扇之平面 圖。 【第5圖】第1圖之直列式轴流風扇之第2軸流風扇之平面 圖。 【第6圖】顯示於第1圖之直列式軸流風扇中的第1支持肋與 第2支持肋之抵接狀態之斜視圖。 【第7圖】第1圖之直列式軸流風扇（無葉輪）之平面圖。 【第8圖】於第1圖之直列式轴流風扇中的第1支持肋及第2 支持肋之截面圖。 【第9圖】將於第1圖之直列式轴流風扇中的第1翼、第1支 持肋、第2支持肋、第2翼以中心轴】為中心並沿著任意之 直控之圓弧於I*方向切斷的截面圖。 的變形例之圖 較佳實施例之鲜細說明 參考第 【第10圖】顯示級合第1支持肋、第2支持肋而得之支持肋 〜 第10圖，詳細說明本發明之較佳實施態 1356879 樣《在本發明之說明中，相異的構成要素間之位置關係及 傾向使用「上」、「下」、「左」、右」來敘述時，該等敘述 是作為顯示圖面之方兩、傾南。不是顯示該等構成要素組 裝後的方向及傾向。又’以下說明中’「軸方向」是平行旋 5轉軸的方向，「徑方尚」是垂直旋轉軸的方向。 ' 第1圖係顯示本發明之一實施態樣之直列式轴流風扇1 · 之斜視圖。第2圖係顯示直列式軸流風扇1之分解斜視圖。 直列式軸流風I係’例如’可作為空冷祠服器等電子機器 φ 之電動是冷卻風扇來使用。如第1圖所示’直列式抽流風扇 10 Η系具有第1圖中配置在上側之第1轴流風扇2及沿著中心轴 J並連接…轴流風扇2而配置在第1圖中下側之第2轴流風 扇3。第1轴流風扇2及第2轴流風扇3係藉螺、絲（省略圖示） . 連结而成-體。此時，如第3圖所示，直列式轴流風扇1以 第2軸流風扇3在中心轴J的方向上反轉的狀態固定在第1轴 15 流風扇2的排氣侧。 有關本實施態樣之直列式軸流風扇1係所謂的雙重反 • 轉式轴流風扇，藉第_示之第_風扇2的第1葉輪21 與第2軸流風扇3的第2葉輪31互相相反方向旋轉’從第1圖 中的上側（即，第1轴流風扇2側）抽入空氣’朝下側（即’ 2〇第2軸流風扇3側）送出而產生中心轴技向的氣流°在以下 說明的中心轴J方向中，抽入空氣側之第1圖中的上側稱為 J 「吸氣側」，排出空氣側之第1圖中的下側稱為「排氣側」。 直列式軸流風扇1係藉第2圖所示之第1葉輪21的旋轉方向 與第2葉輪31之旋轉方向以互相相反方向旋轉’相較於2個 10 葉輪以相同方向旋轉的情形，可實現高靜壓及大風量。 第3圖係將直列式軸流風扇1以包含中心轴J之平面切 縱截面圖，第4圖係從吸氣側所見第1轴流風扇2之平面 圖。如第3圖及第4圖所示，第1轴流風扇2係包含有，具有 乂中％軸J作為中心並於圓周方向以等間距配置的7片第1 1之第1葉輪21 ;藉由使第1葉輪21以中心軸J作為中心 並於第2圖及第4圖中的順時針旋轉而產生沿著中心軸j方 向的氣流（亦即自第3圖t的上側朝向下側之氣流）的第1馬 達^22 ’於也向包圍第1葉輪21之第1殼體23 ;以及，於第j 葉輪21下側（即於第1葉輪21及第2葉輪31之間），以中心輪j 作為中心自第1馬達部22放射狀延竹，且各前端部連接第i "又體23而支持第1馬達部22之多數第1支持肋24。於本實施 形態中有四條第1支持肋24。於第1軸流風扇2中，於第1殼 體23之内側係配置有第1葉輪21、第1馬達部22及第1支持肋 群。第4圖令的箭頭R1係表示第1葉輪21的旋轉方向。 又’於第3圖中，為了方便圖示，針對第1翼211及第1 支持肋24係各自顯示從側方所見的概略形狀；而針對第^馬 達部22之各構成係省略了表示載面的平行斜線圖示。再 者’針對後述之第2軸流風扇3之第2翼311及第2支持肋34 , 亦與第1翼211及第1支持肋24相同，各自顯示從側方所見的 概略形狀；而針對第2馬達部32之各構成，亦與第1馬達部 22相同，省略表示截面的平行斜線圖示。 如第3圖所示，第1馬達部22係包含有固定組合體之 定子部221及旋轉組合體之轉子部222,轉子部222係被支 可:後述，構為中介並以中心抽J為中心相對 二子221旋轉。於以下說明中’雖為求方便而沿著中 心轴J將轉子部222側# & ^ , 來說明，但中心轴】並Γ 子部221侧作為下侧 遂不一疋要與重力方向一致。 π定子。|5 221包含有於平視中以中心轴J為中心之略圓 ，狀基部2211，而基部加係如第3圖及第4圖所示，以 夕數第1支持肋24為中介㈣於第！殼體23之略圓筒狀 的内周面231而維持定子部221之各部分。基部2211係樹 10 15 腊製，且與同狀_旨_錄第1支制24及第丨殼體 23 —起藉由射出成形來形成。 如第3圖所示，於基部2211之中央部係固定有自基部 如向上側（亦即，轉子部222側）突出的略圓筒狀轴承 維持部2212。於轴承維持部2212之内侧，成為轴承機構一 部分的球軸承2213、2214係設置於中心軸j方向之上部及 下部。 疋子部221係更包含有設置於轴承維持部2212外周的 電樞2215,以及設置於電枢2215下側且同時組入有電性連 接電樞2215之線圈而可控制對線圈通電的控制電路之略圓 環板狀電路基板2216»電路基板2216係以多數導線捆成的 20導線群為中介而與設於直列式軸流風扇1之外部的外部電 源連接。又，於第3圖中係省略導線群及外部電源之圖示。 轉子部222係包含有：以中心軸J為中心的略圓筒狀、 具有蓋部並以具磁性金屬材料形成的軛部2221 ;固定於麵 部2221之周壁部的内側面且與電樞2215方向相對的略圓 12 1356879 筒狀場磁鐵2222;以及自執部222〗之莒加&上 <盍部的中心部向下突 出的轴部2223。 轴部2223係插人轴承轉部2212中，且藉由球轴承 2213、2214而可旋轉地被支持。於第！轴流風扇2中轴 5部2223及球轴承2213、2214係扮演支持軛部2221而使其 可以中心轴J為中心相對於基部2211旋轉之軸承機構的角 色。 第1葉輪21係包含有覆蓋第1馬達部22之耗部2221 外側的有蓋略圓筒狀轂部212,及自轂部212之周壁部外側 1〇 (即外側面）放射狀延伸，且於周方向等間隔配置之多數 第1翼211。於本實施形態中轂部212為樹脂製，且與同樣 是樹脂製的第1翼211 —起藉由射出成形來形成。 於第1轴流風扇2中，以第1馬達部22之電路基板2216 為中介對電樞2215供給驅動電流，且於電樞2215與場磁 15 鐵2222之間產生以中心轴J為中心的轉矩，並藉由控制電 路來控制驅動電流，以使設置於轉子部222的第1葉輪21 之多數第1翼211以中心軸J為中心且於第4圖中之順時 針方向以預定的旋轉數旋轉。於本實施形態中係以約 lOOOOirpm來旋轉。藉此，自第3圖中之上側（即第1馬達部 2〇 22之轉子部222側）引入空氣並送至下側（即第2轴流風扇3 側）。 第5圖係自吸氣側所見的第2軸流風扇3之平面圖。 如第3圖及第5圖所示，第2軸流風扇3係包含有沿著中 心軸J且鄰接於第1葉輪21配置的第2葉輪31，且第2 13 1356879 葉輪31係具有以中心軸J為中心而放射狀延伸且同時於圓 周方向等間距配列的5片第2翼311。 第2軸流風扇3更包含有：以中心軸】為中心使第2 葉輪31以與第1葉輪21相反方向（即於第5圖中的逆時針 5旋轉）而以箭頭R2所示的方向旋轉，藉此產生與因第1葉 輪21而產生的氣流相同方向的氣流（即自第3圖中的上側 朝向下側的中心軸J方向的氣流)之第2馬達部32;於徑向 包圍第2葉輪31的第2殼體33 ;以及，於第2葉輪31之 下側（即於第2葉輪31的與第1葉輪21相反之側），以中心 10轴J為中心自第2馬達部放射狀延伸且連接第2殼體33而 支持第2馬達部32之多數第2支持肋34。於本實施形態 中，第2支持肋34與第1支持肋24相同為4條。 於第2軸流風扇3中，在第2殼體33之内側係配置有 第2葉輪31、第2馬達部32及第2支持肋群。再者，將直 15列式軸流風扇1以全體觀之時’於連續的第1殼體23及第 2殼體33之内侧中氣流動的流動路徑中，係自第3圖中的 上側（即吸氣侧）依序配置第1葉輪21、第丨支持肋群、 第2支持肋群、第2葉輪31。此時，第1支持肋群與第2 支持肋群之各支持肋係於中心軸J方向抵接。 20 如第3圖所示，第2馬達部32之構成係與第1馬達部 22之構成相同’係具有定子部321 ’以及配置於定子部321 上側（即吸氣側）且被支持以玎相對於定子部321旋轉的 轉子部322。 定子部321係包含有：以多數第2支持肋34為中介固定於 14 第2殼體33之略圓筒狀的内周面33ι而維持定子部功 各部分的基部3211;於内側設有球轴承3213、3214之略^ 筒狀軸承維持部3212;設置於轴承維持部3212外周的電抱 如；以及設置於電樞3215下侧且同時組入有電性連接· 5樞3215之線圈而可控制對線圈通電的控制電路之 ^ 狀電路基板3216 ^ 板 於本實施形態中，基冑训為樹脂製，且與同樣是樹 脂製的多數第2支持肋34及第2殼體33 一起藉由射出成 形來形成。電路基板Π6係以多數導線捆成的導線群為中 10介而與設於直列式軸流風扇1之外部的外部電源連接。 轉子部322係包含有金屬製的軛部3221 '固定於軛部 3221内側面的場磁鐵3222及自軛部3221向下突出的軸部 3223。轴部3223於轴承維持部3212内藉由球軸承3213、 3214被可旋轉地支持。於第2軸流風扇3中，轴部3223 15及球轴承3213、3214係扮演支持輕部3221而使其可以中 心軸J為中心相對於基部3211旋轉的軸承機構之角色。 第2葉輪31係包含有覆蓋第2馬達部32之輛部3221 外側的有蓋略圓筒狀轂部312,及自轂部312之周壁外側面 放射狀延伸之多數第2翼311。轂部312為樹脂製，且與同 2〇樣是樹脂製的第2翼311 —起藉由射出成形來形成。 於第2轴流風扇3中’藉由驅動第2馬達部32，而使 第2葉輪31之多數第2翼311以中心軸j為中心且於第5 圖中的逆時針方向以預定的旋轉數旋轉。於本實施形態中 係以約8000rpm來旋轉。藉此，自第3圖中之上側（即第2 15 支持肋34側）引入空氣並送至下側(即第1轴流風扇2側）。 第6圖係表示直列式轴流風扇1的第1支持肋24與第 2支持肋34之抵接狀態的斜視圖。如第6圖所示，於第i 葉輪21與第2葉輪31之間，係配置有兩細流風扇2、3所 各自具備的第1支持肋24及第2支持肋34。第丨支持肋 Μ係被以圓周方向等間隔配置，而第2支持肋34亦被以圓 周方向等《配置。當以螺絲等連接第#流風扇2與第2 轴流風扇3時’第1支持肋24與第2支持肋34係於軸方 向抵接且4條之第2支持肋Μ係各自配置於4條第工支 持肋24之第2葉輪31側（即排氣側）。於平視(即自中心轴 J方向所見）的情形中，各第2支持肋34係與第i支持肋 24跨越全長互相重疊。於以下的制中，係將第丨支持肋 24與第2支持肋34合起來單獨以「支持肋44」稱之。換 15 。之藉由os有多數第！支持肋Μ與多數第2支持肋34 之多數支持肋44，第]ί 馬達部22及第2馬達部32係於第 1葉輪21與第2葉輪31之間被支持。 20 誠如上所述藉由使第丨支持肋24與第2支持肋Μ 互相重疊而構錢細44。讀肋44係料丨支持肋24 與第2支持肋34的邊界部，以大致無段差的狀態互相重 疊。換言之，係以第1支持肋24的面向氣流上游側之第ι 支持肋第1侧面241，與第2支持肋34的面向氣流上游側 之第2支持肋第1側面34卜形成大致無段差之連續面。相 同地’以第1支持肋24的面向氣流下游側之第丨支持肋 2側面242,與第2切肋34的面向氣流下游側之第2支 16 持肋第2側面342,形成大致無段差之連續面。也就β說， ^持肋44雖本為使第1支持肋24與第2支持肋34二重 -而構成者，卻形成宛如-條支持肋。以下，將以第i 持肋第1侧面241與第2支持肋第i側面341所形 續面稱為支持肋第1側面441。再者，將以第i支持肋1連 側面242與第2支持肋第2側面342所形成的連續面2 支持肋第2側面442。 為 第7圖係自轴方向所見的直列式轴流風扇平面圖。於 第7圖中係省略葉輪。第8圖係於沿著第7圖中； B〜r 台 a深、 15 線、c — c線於軸方向切斷之各截面圖。該等A〜A 線B B線、c_c線係表示各自以中心轴】為中心 狐線。第9圖係將第1翼2U、支持肋44、第2翼311以 中％軸1為巾心並沿著任意直徑的圓弧於軸方向切斷的裁 面圖’以下’稱為於圓筒面之截面。再者’於第9圖 箭頭R1係表不第1葉輪21之旋轉方向，並同時表示 — 移動方向。再者，箭頭R2係表示第2葉輪31之 20 方疋轉方向，並同時表示第2翼311之移動方向。如第8圖 所不在支持肋44之前述於圓筒面的截面中之長邊方向·， :、使，、輪方向上端較下端相對於中心轴】傾斜以 葉輪21之旋轉方向之相反側。支持肋44被配置以横斷藉 由第1_體23與第2殼體33所構成的氣流路。據此 持肋44必須盡可能地被配置得可使氣流之能量損失變小。 於此，在說明支持肋44的配置之前，先針對第i翼2ΐι 之構造進行說明。第1翼2ιι的平視形狀係如第4圖所示， 17 並非對㈣直線延伸，而是成為隨著自徑向内側至外側行 朝著’、第1葉輪21之旋轉方向之相反側擴大的扇形。 再者以第1翼211的中心軸】為中心的於圓筒面之截面 :狀如第9圖所不，係使第1翼211之上緣（即旋轉方向 J緣)較下緣(即旋轉方向後緣）傾斜及彎曲以位於第工葉 輪21之旋轉方向下游側的狐狀。通常，用於冷卻電子機器 内P的！^風扇’係、依據電子機器内的系統阻抗與轴流風 ^之風量以及靜壓來選定。於此，系統阻抗係指於電子機 器内的靜壓與風量的關係，亦即於系統内的氣流的流動難 度、系統内的氡流的阻力之意。大多於電子機器内，電子 零件及電源等係、緊密集中於狹小的空間中，而多會成為高 系統阻抗’ ^0·會成H統内之氣流阻力値大的狀態。因此， 對用於電子機器内部冷卻的軸流風扇係要求高靜壓。 於軸流風扇中達成高靜壓的方法，係有減小於第1軸 流風扇2於平視中相鄰的第丨翼211的間隔之方法。此時， 可將在第1翼211之前述於圓筒面之截面中的弧狀部分之 弧長隨著自徑向内側至外側之行進而增長。於此，第i翼 211的前述弧狀部分之弧長係指將弧狀部分之厚度方向的 中間点連結之弧長度之意。然而，將第丨翼211之前述弧 狀部分之弧長增長，則會造成第丨翼211之中心轴j方向 之尚度隨者自徑向内側至外侧之行進而變高^藉由減少於 徑向内側與外側第1翼211之軸方向高度差，以增加於殻 體所構成的風洞部内的第1翼211所占的有効體積（亦即由 轴方向所見的第1翼211之面積與第1翼211之軸方向高 1356879 度之乘積會變大），而可獲得一方面具有高風量且一方面達 成高靜壓之第1軸流風扇2。實現其之一個指標，係如第$ 圖所示，可在第i翼211之前述於圓筒面之截面的弧狀部 分中’隨著徑向内側至外側行進而增大特別是後緣部分之 5相對於中心轴J的傾斜（以下稱為第1傾斜角α)。此1緣 部分係定位於氣流之下游側，且亦為規定第丨葉輪21之氣 流的產生方向之部分。 為了減少支因持肋44而造成的氣流損失，支持肋44 之側面（亦即支持肋第1側面ΦΠ、支持肋第2側面442) Η)係較佳如第9圖所示般配置，以使其與自^轴流風扇2 產生的氣流之流速方向大致平行，亦即大致對第丨翼2ιι 之後緣部分垂直。換言之，從氣流之流動方向來看支持肋 44 ’支持肋44係較佳配置以使支持肋44之投影面積成為 最小。當氣流與支持肋44之側面平行時，通過支持肋44 15附近的空氣，其因支持肋第i側面44卜支持肋第2側面 而W成的旎量損失很少。支持肋44之上端面243雖被 配，成與氣流相對，但於本實施形態中並非平行於氣流， 而疋對於氣流以銳角角度交錯。因此，可抑制氣流於上端 面243干涉時之空氣損失。於本實施形態中，上端面243 2〇之形狀雖為平面，但不限於此，而亦可形成例如彎曲面。 第1葉輪21 %轉後所產生的空氣之流動方向，會成為 與相對於第1翼211之後緣部分的90度方向大致平行。也 就疋說’若是規定第1傾斜角α之第1翼211的後緣部分 與支持肋44之截面的長邊方向係呈9〇度構成，則藉由第1 19 1356879 葉輪21產生的氣流與支持肋44之截面的長邊方向會呈大 致平行。但是，此氣流會依第1葉輪21之旋轉速度、周圍 環境等而變化流速、角度等。於前述情形中，支持肋44之 截面的長邊方向之相對於中心軸J的角度β，可因應第1 5 葉輪21之旋轉速度、周圍環境等適當地變更。此時，第1 翼211之後緣部分與支持肋44之截面的長邊方向所形成的 角度為100度以下，而以行成80度〜100度為宜。也就是 說，第1傾斜角α與支持肋44之截面的長邊方向之角度β 的和係成為80度〜100度。 10 藉由上述構成，因第1葉輪21旋轉而產生的氣流，幾 乎不會改變流動方向且可將能量損失減至最小限度而通過 支持肋44。通過支持肋44的空氣係朝向第2翼311流動。 以第2翼311之中心軸J為中心的於圓筒面之截面形狀， 如第9圖所示，係使得第2翼311之上緣（即旋轉方向前緣） 15 較下緣（即旋轉方向後緣)傾斜及彎曲以位於第2葉輪31之 旋轉方向下游側的弧狀。第2翼311之前述於圓筒面之弧 狀截面的長邊方向之特別定位於氣流之上游側的前緣部 分，其相對於中心軸J的傾斜（以下稱為第2翼傾斜角γ)， 係設定成比氣流流入第2葉輪31之角度（近似支持肋44 20 的角度β )為小。 一般而言，自軸流風扇排出的空氣之氣流，概括分類 係具有3種速度分量。即軸方向分量（軸方向之流速）、迴 旋分量（葉輪旋轉方向之流速）、離心分量（朝徑向外部之 流速）之3種速度分量。為了使直列式軸流風扇1之送風 20 1356879 特性提升，必須於上述3種速度分量中提高轴方向分量之 此例。換言之，必須盡可能地將迴旋分量及離心分量變換 成轴方向分量。 其次，針對將前述廻旋分量及離心分量變換成轴方向 5分量之作用進行說明。進入第2翼311的空氣，如第9圖 所不’會於第2翼311之旋轉方向中與前進側翼面3111碰 撞。第2翼311自其中段至後緣部分係彎曲成朝旋轉方向 前方彎曲，而前進側翼面3111係傾斜成朝向徑向内部側。 據此，與第2翼311碰撞的空氣會被限制以朝徑向内部流 10動’而會進行氣流之速度向量的變換。據此，氣流之速度 分量中的離心方向分量，會朝向徑向内部。因此，可抑制 氣流往徑向外部之擴散。 進入第2翼311的空氣之迴旋分量，係藉由與第2翼 311之前進側翼面3111碰撞而變換成轴方向分量。據此， 第2翼311之作用，係於自第1翼211排出的空氣之流速 之中，將廻旋分量與離心分量變換成轴方向分量。藉此’ 自直列式轴流風扇1排出的空氣之氣流’係不會朝徑向外 部擴散地被供給至被冷卻部材。 於僅包含有1個葉輪的軸流風扇單品（非直列式的一 20 般風扇）中，縱使完成了最適當的翼設計’仍無法使伴隨 著葉輪旋轉的迴旋分量成為零。然而’於直列式軸流風扇1 中，可藉由與第1葉輪21反方向旋轉的第2葉輪31回收 第1葉輪21所產生的氣流之廻旋分量，而因此可提供靜壓 特性高的轴流風扇。 21 1356879 於此會成為重點的是’當自第1葉輪21排出的空氣通 過支持肋44時，氣流之流速方向並未被變換。目前，於已 為公眾所知的直列式轴流風扇t，有很多在第1葉輪與第2 葉輪之間配置有静翼。此時，自第1葉輪排出的空氣之流 5 速的迴旋分量，會藉由静翼被回收而變換成軸方向分量。 藉由静翼變換成軸方向分量的氣流，會以藉第2葉輪賦予 廻旋分量之狀態從第2葉輪被排出。換言之，藉由在第1On the average side of the turning direction, the M airflow direction is substantially parallel to the aforementioned inclined surface. Hurricane This type of 'can not only increase the air volume of the in-line draft fan and the static factory') can also suppress the airflow discharged from the inline axial fan to spread outward in the radial direction. Thereby, the airflow discharged from the in-line axial fan can be efficiently supplied to the object to be cooled such as an electronic component, and the cooling efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing an in-line axial flow fan according to an embodiment of the present invention. [Fig. 2] An exploded perspective view of the in-line axial flow fan of Fig. 1. [Fig. 3] A longitudinal sectional view of the in-line axial flow fan of Fig. 1. [Fig. 4] A plan view of the first axial fan of the in-line axial flow fan of Fig. 1. [Fig. 5] A plan view of the second axial fan of the in-line axial flow fan of Fig. 1. Fig. 6 is a perspective view showing a state in which the first support rib and the second support rib are in contact with each other in the in-line axial fan of Fig. 1. [Fig. 7] A plan view of the in-line axial flow fan (without impeller) of Fig. 1. Fig. 8 is a cross-sectional view showing the first support rib and the second support rib in the in-line axial flow fan of Fig. 1. [Fig. 9] The first wing, the first support rib, the second support rib, and the second wing of the inline axial flow fan of Fig. 1 are centered on the central axis and are along a straight line of any direct control. A section cut of the arc in the I* direction. BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT A detailed description of a preferred embodiment of the present invention will be described in detail with reference to Fig. 10 showing support ribs of the first support rib and the second support rib. State 1356879 "In the description of the present invention, when the positional relationship between the different constituent elements and the tendency to use "upper", "lower", "left", and right" are described, the descriptions are used as display surfaces. Fang two, leaning south. It does not show the direction and tendency of these components after assembly. Further, in the following description, the "axis direction" is a direction in which the axis of rotation is parallel, and the direction of the axis is the direction of the vertical axis of rotation. Fig. 1 is a perspective view showing an in-line axial flow fan 1 according to an embodiment of the present invention. Fig. 2 is an exploded perspective view showing the in-line axial fan 1. The in-line axial flow I system 'for example' can be used as an electric machine such as an air-cooled server. As shown in Fig. 1, the in-line draft fan 10 has the first axial fan 2 disposed on the upper side in Fig. 1 and the axial fan 2 connected along the central axis J, and is disposed in Fig. 1 The second axial fan 3 on the lower side. The first axial fan 2 and the second axial fan 3 are connected by a screw or a wire (not shown). At this time, as shown in Fig. 3, the in-line axial fan 1 is fixed to the exhaust side of the first shaft 15 flow fan 2 in a state where the second axial fan 3 is reversed in the direction of the center axis J. The in-line axial flow fan 1 according to the present embodiment is a so-called double reverse-rotation axial flow fan, and the first impeller 21 of the first fan 2 and the second impeller 31 of the second axial fan 3 are shown by the first embodiment. Rotating in opposite directions' is drawn from the upper side in the first drawing (that is, on the side of the first axial fan 2) to the lower side (that is, the side of the 2nd second axial fan 3) to generate the central axis. In the central axis J direction described below, the upper side in the first drawing of the drawn air side is referred to as J "intake side", and the lower side in the first drawing of the exhaust air side is referred to as "exhaust side". "." The in-line axial fan 1 is rotated in the opposite direction by the rotation direction of the first impeller 21 and the rotation direction of the second impeller 31 as shown in FIG. 2, and is rotated in the same direction as the two 10 impellers. Achieve high static pressure and high air volume. Fig. 3 is a longitudinal sectional view showing the in-line axial fan 1 in a plane including the central axis J, and Fig. 4 is a plan view showing the first axial fan 2 seen from the suction side. As shown in FIGS. 3 and 4, the first axial fan 2 includes seven first impellers 11 of the first one having the % axis J in the center and arranged at equal intervals in the circumferential direction. The first impeller 21 is rotated clockwise in the second and fourth views with the central axis J as the center, and the airflow in the direction of the central axis j is generated (that is, from the upper side toward the lower side of the third figure t). The first motor 22' of the air flow is also directed to the first casing 23 surrounding the first impeller 21; and to the lower side of the j-impeller 21 (that is, between the first impeller 21 and the second impeller 31). The center wheel j is radially extended from the first motor unit 22, and the front end portion is connected to the i-th body 23 to support the plurality of first support ribs 24 of the first motor unit 22. In the present embodiment, there are four first support ribs 24. In the first axial fan 2, the first impeller 21, the first motor portion 22, and the first support rib group are disposed inside the first casing 23. The arrow R1 of the fourth figure indicates the rotation direction of the first impeller 21. In the third drawing, for the sake of convenience of illustration, the first wing 211 and the first support rib 24 are each shown in a schematic shape as seen from the side, and the respective configurations of the second motor portion 22 are omitted. Parallel diagonal lines of the face. In addition, the second wing 311 and the second support rib 34 of the second axial fan 3, which will be described later, are similar to the first wing 211 and the first support rib 24, and each has a schematic shape as seen from the side. The respective configurations of the second motor portion 32 are the same as those of the first motor portion 22, and the parallel oblique lines indicating the cross sections are omitted. As shown in Fig. 3, the first motor unit 22 includes a stator portion 221 of a fixed assembly and a rotor portion 222 of a rotating assembly. The rotor portion 222 is supported by a rotor unit 222, which will be described later. The center rotates relative to the two sub-221s. In the following description, although the rotor portion 222 side # & ^ is described along the center axis J for convenience, the center axis is not the same as the gravity direction. π stator. |5 221 includes a slightly rounded base portion 2211 centered on the central axis J in the plan view, and the base portion is attached as shown in Figs. 3 and 4, and the first support rib 24 is interposed (iv) The first! The substantially cylindrical inner peripheral surface 231 of the casing 23 maintains each portion of the stator portion 221. The base portion 2211 is made of a tree 10 15 and is formed by injection molding together with the first and second casings 24 and 23 of the same shape. As shown in Fig. 3, a substantially cylindrical bearing maintaining portion 2212 projecting from the base portion toward the upper side (i.e., the rotor portion 222 side) is fixed to the center portion of the base portion 2211. Inside the bearing holding portion 2212, the ball bearings 2213 and 2214 which are part of the bearing mechanism are provided on the upper portion and the lower portion in the direction of the central axis j. The dice portion 221 further includes an armature 2215 disposed on the outer circumference of the bearing maintaining portion 2212, and a control circuit disposed on the lower side of the armature 2215 and simultaneously incorporating a coil electrically connected to the armature 2215 to control energization of the coil. The ring-shaped circuit board 2216»the circuit board 2216 is connected to an external power source provided outside the in-line axial fan 1 via a 20-wire group bundled with a plurality of wires. Further, in Fig. 3, the illustration of the wire group and the external power source is omitted. The rotor portion 222 includes a substantially cylindrical shape having a cover portion and a yoke portion 2221 formed of a magnetic metal material, and is fixed to the inner side surface of the peripheral wall portion of the face portion 2221 and the armature 2215. A relatively rounded direction 12 1356879 cylindrical field magnet 2222; and a shaft portion 2223 that protrudes downward from the center portion of the upper portion of the self-supporting portion 222. The shaft portion 2223 is inserted into the bearing turn portion 2212 and rotatably supported by the ball bearings 2213, 2214. In the first! The axial fan 5 central portion 5223 and the ball bearings 2213 and 2214 function as a bearing mechanism for supporting the yoke portion 2221 so as to be rotatable about the central axis J with respect to the base portion 2211. The first impeller 21 includes a cover-like substantially cylindrical boss portion 212 covering the outer side of the consumable portion 2221 of the first motor portion 22, and radially extending from the outer side surface (ie, the outer side surface) of the peripheral wall portion of the hub portion 212, and A plurality of first wings 211 are arranged at equal intervals in the circumferential direction. In the present embodiment, the hub portion 212 is made of resin, and is formed by injection molding together with the first blade 211 which is also made of resin. In the first axial fan 2, a drive current is supplied to the armature 2215 via the circuit board 2216 of the first motor unit 22, and a central axis J is generated between the armature 2215 and the field magnet 15 2222. Torque, and the drive current is controlled by the control circuit so that the plurality of first wings 211 of the first impeller 21 provided in the rotor portion 222 are centered on the central axis J and are clockwise in the fourth figure. The number of rotations is rotated. In the present embodiment, it is rotated at about 100 rpm. Thereby, air is introduced from the upper side in Fig. 3 (i.e., the rotor portion 222 side of the first motor portion 2? 22) and sent to the lower side (i.e., the second axial fan 3 side). Fig. 5 is a plan view of the second axial fan 3 seen from the suction side. As shown in FIGS. 3 and 5, the second axial fan 3 includes a second impeller 31 disposed along the central axis J and adjacent to the first impeller 21, and the second 13 1356879 impeller 31 has a center. The five second wings 311 which are radially extended and which are arranged at equal intervals in the circumferential direction at the same time. The second axial fan 3 further includes a direction in which the second impeller 31 is opposite to the first impeller 21 (that is, rotated counterclockwise in FIG. 5) in the direction indicated by an arrow R2 around the central axis. Rotation, thereby generating the second motor portion 32 of the airflow in the same direction as the airflow generated by the first impeller 21 (that is, the airflow from the upper side toward the lower central axis J in the third diagram); The second casing 33 of the second impeller 31 and the lower side of the second impeller 31 (that is, the side of the second impeller 31 opposite to the first impeller 21) are centered on the center 10 axis J from the second motor. The plurality of second support ribs 34 that support the second motor portion 32 are radially extended and connected to the second case 33. In the present embodiment, the second support ribs 34 are the same as the first support ribs 24. In the second axial fan 3, the second impeller 31, the second motor portion 32, and the second support rib group are disposed inside the second casing 33. Further, in the flow path in which the straight 15-row type axial flow fan 1 flows in the inside of the continuous first casing 23 and the second casing 33 as viewed from the top, the upper side in FIG. 3 is used. (ie, the intake side) The first impeller 21, the second support rib group, the second support rib group, and the second impeller 31 are disposed in this order. At this time, the support ribs of the first support rib group and the second support rib group are in contact with each other in the direction of the central axis J. As shown in Fig. 3, the configuration of the second motor unit 32 is the same as that of the first motor unit 22, and has a stator portion 321' and is disposed on the upper side of the stator portion 321 (i.e., the intake side) and is supported by 玎The rotor portion 322 that rotates with respect to the stator portion 321 . The stator portion 321 includes a base portion 3211 that is fixed to the semi-cylindrical inner peripheral surface 33 of the second casing 33 by a plurality of second support ribs 34 to maintain the stator portion, and a ball is provided on the inner side. a cylindrical bearing maintaining portion 3212 of the bearings 3213 and 3214; an electric hug provided on the outer circumference of the bearing maintaining portion 3212; and a coil disposed on the lower side of the armature 3215 and simultaneously electrically connected to the pivot 515 In the present embodiment, the control circuit for controlling the energization of the coil is made of a resin, and is made of a plurality of second support ribs 34 and a second case 33 which are made of resin. Injection molding is formed. The circuit board 6 is connected to an external power source provided outside the in-line axial fan 1 by a plurality of wires bundled by a plurality of wires. The rotor portion 322 includes a field yoke 3222 fixed to the inner side surface of the yoke portion 3221 and a shaft portion 3223 protruding downward from the yoke portion 3221. The shaft portion 3223 is rotatably supported by the ball bearings 3213, 3214 in the bearing maintaining portion 3212. In the second axial fan 3, the shaft portion 3223 15 and the ball bearings 3213 and 3214 function as a bearing mechanism that supports the light portion 3221 so as to be rotatable about the center axis J with respect to the base portion 3211. The second impeller 31 includes a cover-like substantially cylindrical boss portion 312 that covers the outside of the vehicle portion 3221 of the second motor portion 32, and a plurality of second wings 311 that radially extend from the outer peripheral surface of the peripheral wall portion of the hub portion 312. The hub portion 312 is made of resin and is formed by injection molding together with the second wing 311 made of resin. In the second axial fan 3, by driving the second motor portion 32, the plurality of second wings 311 of the second impeller 31 are centered on the central axis j and rotated counterclockwise in FIG. 5 by a predetermined rotation. Number rotation. In the present embodiment, it is rotated at about 8000 rpm. Thereby, air is introduced from the upper side in Fig. 3 (i.e., on the side of the 2nd 15th support rib 34) and sent to the lower side (i.e., the side of the first axial fan 2). Fig. 6 is a perspective view showing a state in which the first support rib 24 of the inline axial fan 1 is in contact with the second support rib 34. As shown in Fig. 6, between the i-th impeller 21 and the second impeller 31, the first support ribs 24 and the second support ribs 34 provided in each of the two thin-flow fans 2, 3 are disposed. The second support ribs are arranged at equal intervals in the circumferential direction, and the second support ribs 34 are also arranged in the circumferential direction. When the first flow fan 2 and the second axial flow fan 3 are connected by screws or the like, the first support rib 24 and the second support rib 34 are in contact with each other in the axial direction, and the four second support ribs are arranged in each of the four. The second worker supports the second impeller 31 side of the rib 24 (i.e., the exhaust side). In the case of head-up (i.e., as seen from the central axis J direction), each of the second support ribs 34 and the i-th support rib 24 overlap each other across the entire length. In the following system, the second support rib 24 and the second support rib 34 are collectively referred to as "support rib 44". Change 15 . The os has a majority! The ribs and the plurality of support ribs 44 of the plurality of second support ribs 34 are supported, and the motor portion 22 and the second motor portion 32 are supported between the first impeller 21 and the second impeller 31. 20 As described above, the weight of the second support rib 24 and the second support rib 互相 are superposed on each other. The read rib 44 is a boundary portion between the support rib 24 and the second support rib 34, and overlaps each other in a substantially stepless state. In other words, the first y support rib first side surface 241 of the first support rib 24 facing the airflow upstream side and the second support rib first side surface 34 of the second support rib 34 facing the airflow upstream side are substantially stepless. Continuous surface. Similarly, the side surface 242 of the second support rib 2 facing the airflow downstream side of the first support rib 24 and the second branch 16 holding the rib second side surface 342 of the second cut rib 34 facing the airflow downstream side form substantially no step. The continuous surface. In other words, the rib 44 is formed so that the first support rib 24 and the second support rib 34 are double-shaped, and the like is formed as a strip-supporting rib. Hereinafter, the i-th retaining rib first side surface 241 and the second support rib i-side surface 341 are referred to as a support rib first side surface 441. Further, the rib second side surface 442 is supported by the continuous surface 2 formed by the i-th support rib 1 side surface 242 and the second support rib second side surface 342. Figure 7 is a plan view of the in-line axial fan seen from the axis. In Figure 7, the impeller is omitted. Fig. 8 is a cross-sectional view taken along line 7; B to r, a deep, 15 line, and c-c line cut in the axial direction. These A to A lines B B line and c_c line indicate that the center line is the center of the fox line. In the ninth figure, the first wing 2U, the support ribs 44, and the second wings 311 are cut in the axial direction along the circular axis of the arbitrary diameter with the % axis 1 as the center of the circle. The cross section of the cylinder surface. Further, the arrow R1 in Fig. 9 indicates the direction of rotation of the first impeller 21, and indicates the direction of movement. Further, the arrow R2 indicates the direction in which the second impeller 31 rotates, and also indicates the moving direction of the second wing 311. As shown in Fig. 8, the longitudinal direction of the cross section of the support rib 44 in the cylindrical surface is not so long as the upper end in the wheel direction is inclined from the lower end with respect to the central axis in the direction of rotation of the impeller 21. The support ribs 44 are disposed to traverse the air flow path formed by the first body 23 and the second casing 33. Accordingly, the ribs 44 must be configured as much as possible to reduce the energy loss of the gas stream. Here, before explaining the arrangement of the support ribs 44, the structure of the i-th wing 2ΐ1 will be described. The head-up shape of the first wing 2 ιι is shown in Fig. 4, and 17 does not extend straight to the (four) line, but expands from the radially inner side to the outer row toward the opposite side of the rotation direction of the first impeller 21. The fan shape. Further, the cross section of the cylindrical surface centering on the central axis of the first wing 211 is as shown in Fig. 9, and the upper edge of the first wing 211 (i.e., the edge of the rotation direction J) is lower than the lower edge (i.e., The trailing edge of the rotational direction is inclined and curved to have a fox shape on the downstream side in the rotational direction of the first impeller 21. Usually, it is used to cool the P inside the electronic machine! The ^fan system is selected based on the system impedance in the electronic machine and the amount of wind in the axial flow and static pressure. Here, the system impedance refers to the relationship between the static pressure and the air volume in the electronic machine, that is, the difficulty of the flow of the airflow in the system and the resistance of the turbulence in the system. Larger than electronic devices, electronic components and power supplies are closely concentrated in a small space, and many will become high system impedance ' ^ 0 · will become a state of air flow resistance within the H system. Therefore, a high static pressure is required for an axial fan system for internal cooling of an electronic machine. The method of achieving high static pressure in the axial flow fan is a method of reducing the interval between the adjacent first flaps 211 of the first axial fan 2 in plan view. At this time, the arc length of the arcuate portion in the cross section of the first surface of the first wing 211 in the cylindrical surface can be increased from the inner side to the outer side in the radial direction. Here, the arc length of the arcuate portion of the i-th wing 211 means the length of the arc connecting the intermediate points in the thickness direction of the arcuate portion. However, increasing the arc length of the arcuate portion of the first flap 211 causes the degree of the central axis j of the first flap 211 to become higher as it progresses from the radially inner side to the outer side. The difference between the radial inner side and the outer first wing 211 in the axial direction is increased by the effective volume occupied by the first wing 211 in the wind tunnel formed by the casing (that is, the area of the first wing 211 seen from the axial direction) The product of the first wing 211 in the axial direction at a height of 1356879 degrees becomes large, and the first axial fan 2 having a high air volume on the one hand and a high static pressure on the one hand can be obtained. One of the indicators for achieving this is as shown in Fig. $, which can be increased in the arc portion of the section of the first i-wing 211 in the cylindrical section, as the radial inner side to the outer side travels, particularly the trailing edge part. The inclination of the 5 with respect to the central axis J (hereinafter referred to as the first inclination angle α). The one edge portion is positioned on the downstream side of the air flow and is also a portion that defines the direction in which the air flow of the second impeller 21 is generated. In order to reduce the airflow loss caused by the ribs 44, the side faces of the support ribs 44 (that is, the support rib first side Φ Π and the support rib second side 442) are preferably arranged as shown in FIG. It is substantially parallel to the flow direction of the airflow generated by the axial fan 2, that is, substantially perpendicular to the trailing edge portion of the first flap 2 ι. In other words, the support ribs 44' support ribs 44 are preferably arranged such that the projected area of the support ribs 44 is minimized from the flow direction of the air flow. When the air flow is parallel to the side surface of the support rib 44, the air near the support rib 44 15 has a small amount of enthalpy loss due to the support rib i-side 44 and the support rib second side. The upper end surface 243 of the support rib 44 is arranged to face the air flow, but in the present embodiment, it is not parallel to the air flow, and the air flow is staggered at an acute angle. Therefore, the air loss when the airflow interferes with the upper end surface 243 can be suppressed. In the present embodiment, the shape of the upper end surface 243 2 为 is a flat surface, but is not limited thereto, and may be formed, for example, as a curved surface. The flow direction of the air generated after the first impeller is rotated by 21% is substantially parallel to the 90-degree direction with respect to the rear edge portion of the first wing 211. In other words, if the trailing edge portion of the first wing 211 defining the first inclination angle α and the longitudinal direction of the section of the support rib 44 are 9 degrees, the airflow generated by the impeller 21 of the first 19 1356879 is obtained. The longitudinal direction of the section of the support rib 44 is substantially parallel. However, this air flow changes the flow velocity, angle, and the like depending on the rotational speed of the first impeller 21, the surrounding environment, and the like. In the above case, the angle β of the longitudinal direction of the cross section of the support rib 44 with respect to the central axis J can be appropriately changed in accordance with the rotational speed of the first impeller 21, the surrounding environment, and the like. At this time, the angle formed by the trailing edge portion of the first wing 211 and the longitudinal direction of the cross section of the support rib 44 is 100 degrees or less, and is preferably 80 to 100 degrees. That is, the sum of the first inclination angle α and the angle β of the longitudinal direction of the cross section of the support rib 44 is 80 to 100 degrees. According to the above configuration, the air current generated by the rotation of the first impeller 21 hardly changes the flow direction and can minimize the energy loss and pass through the support ribs 44. The air passing through the support ribs 44 flows toward the second wings 311. The cross-sectional shape of the cylindrical surface centering on the central axis J of the second wing 311, as shown in Fig. 9, is such that the upper edge of the second wing 311 (i.e., the leading edge in the rotational direction) 15 is lower than the lower edge (i.e., rotated). The trailing edge of the direction is inclined and curved so as to be located in an arc shape on the downstream side in the rotation direction of the second impeller 31. The front edge portion of the second wing 311 which is positioned on the upstream side of the airflow in the longitudinal direction of the arcuate cross section of the cylindrical surface, and the inclination thereof with respect to the central axis J (hereinafter referred to as the second wing inclination angle γ) The angle is set to be smaller than the angle at which the airflow flows into the second impeller 31 (approximately the angle β of the support rib 44 20 ). In general, the airflow from the axial fan exhaust fan has three speed components. That is, three kinds of velocity components of the axial direction component (flow velocity in the axial direction), the swirl component (flow velocity in the direction of rotation of the impeller), and the centrifugal component (flow velocity toward the outside in the radial direction). In order to improve the characteristics of the air supply 20 1356879 of the inline axial fan 1, it is necessary to increase the axial direction component among the above three kinds of speed components. In other words, it is necessary to transform the convoluted component and the centrifugal component into an axial component as much as possible. Next, the action of converting the above-described swirl component and centrifugal component into the axial direction component 5 will be described. The air entering the second wing 311 collides with the forward side airfoil 3111 in the rotation direction of the second wing 311 as shown in Fig. 9. The second wing 311 is curved from the middle to the rear edge portion to be curved forward in the rotational direction, and the advancing side airfoil 3111 is inclined to face the radially inner side. Accordingly, the air colliding with the second wing 311 is restricted to flow toward the inside of the radial direction, and the velocity vector of the airflow is converted. Accordingly, the centrifugal direction component in the velocity component of the airflow is directed toward the radially inner portion. Therefore, the diffusion of the airflow to the outside of the radial direction can be suppressed. The swirling component of the air entering the second wing 311 is converted into an axial direction component by collision with the front wing surface 3111 of the second wing 311. Accordingly, the action of the second wing 311 converts the swirl component and the centrifugal component into the axial direction component among the flow velocity of the air discharged from the first wing 211. Thereby, the air flow of the air discharged from the in-line axial flow fan 1 is not supplied to the member to be cooled in a radially outwardly diffused manner. In an axial fan single product (a non-inline type of 20-like fan) including only one impeller, the swirl component accompanying the impeller rotation cannot be made zero even if the most appropriate wing design is completed. However, in the in-line axial flow fan 1, the helix component of the airflow generated by the first impeller 21 can be recovered by the second impeller 31 that rotates in the opposite direction to the first impeller 21, and thus the shaft having high static pressure characteristics can be provided. Flow fan. 21 1356879 It will be emphasized here that when the air discharged from the first impeller 21 passes through the support ribs 44, the flow velocity direction of the air flow is not changed. At present, there are many in-line axial fans t known to the public, and a plurality of stator blades are disposed between the first impeller and the second impeller. At this time, the swirling component of the fifth-speed air flow discharged from the first impeller is converted into the axial direction component by the stationary blade being recovered. The airflow which is converted into the axial direction component by the stationary blade is discharged from the second impeller in a state in which the second impeller imparts a swirl component. In other words, by the first
葉輪與第2葉輪之間配置静翼，自直列式轴流風扇排出的 空氣會變得以具有廻旋分量的狀態被排出。因此，藉由此 10 種的直列式軸流風扇所產生的氣流，會因其廻旋分量，而 於自直列式軸流風扇被排出後，朝向徑向外部擴散，而無 法充分地對被冷卻部材供給氣流。據此，於直列式軸流風 扇中，不宜在第1葉輪與第2葉輪之間設置静翼。 其次’針對於本發明中支持肋44的詳細形狀進行說 15明。如上所述’第1翼211係具有以中心轴j為中心的於 圓筒面之截面形狀之弧狀截面相對於中心轴J方向的傾斜 角’其傾斜角係隨著向經向外側行進而變大。因此，藉由 旋轉第1葉輪21而自第1翼叫產生的氣流之流速角度會 因徑向的位置而異。詳+夕 y 序0之，因於徑向内侧中第1翼截面 2〇之傾斜角很小，氣流之流遠庳知祖丄 逯角度相對於中心軸j方向雖具 有大角度，但因於經向外側中 从尸 '长夕士、每匕也 第1翼截面之傾斜角很大， 故乳流之k速角度係相對 此，為求減低因支持肋44而造:方向具有小角度。因 要依徑向變化支持肋44之傾声礼流之忐!損失’必須 ’角X。於本發明中，係將具 22 1356879 有第1傾斜角α的第1翼211之後緣部分，與以支持肋44 之中心轴J作為中心的於圓筒面之截面的長邊方向所形成 的角度設定成100度以下（詳言之，80度〜1〇〇度左右）。 理想上，希望該角度呈90度。 5 再者’自第1葉輪21排出的氣流，不僅其相對於中心 軸J之角度係因應徑向位置而異，其流速亦因應徑向位置 而異。於第1翼211之徑向外侧中流速大，而於徑向内側 中流速小。因此，通過支持肋44的氣流之能量損失係希望A static vane is disposed between the impeller and the second impeller, and air discharged from the in-line axial fan is discharged in a state of having a swirl component. Therefore, the airflow generated by the ten kinds of in-line axial flow fans is diffused toward the outside of the radial direction after being discharged from the in-line axial flow fan due to the swirl component, and the cooling member cannot be sufficiently cooled. Supply airflow. Accordingly, in the in-line axial fan, it is not preferable to provide a stationary blade between the first impeller and the second impeller. Next, the detailed shape of the support rib 44 in the present invention will be described. As described above, the first wing 211 has an inclination angle of an arc-shaped cross section of a cross-sectional shape of the cylindrical surface centered on the central axis j with respect to the central axis J, and the inclination angle thereof is traveling toward the outer side of the warp direction. Become bigger. Therefore, the flow velocity angle of the airflow generated from the first wing by rotating the first impeller 21 varies depending on the radial position. Detailed + 夕 y sequence 0, because the inclination angle of the 1st wing section 2〇 in the radial inner side is small, the flow of the airflow is far from the angle of the ancestor, although it has a large angle with respect to the central axis j direction, but because of In the lateral direction, the inclination angle of the section of the first wing of the corpse is very large, so the k-speed angle of the milk flow is relative to this, in order to reduce the support rib 44, the direction has a small angle. Because of the radial change, the ribs of the ribs 44 are supported! The loss 'must' angle X. In the present invention, the rear edge portion of the first wing 211 having the first inclination angle α of 22 1356879 is formed in the longitudinal direction of the cross section of the cylindrical surface centering on the central axis J of the support rib 44. The angle is set to 100 degrees or less (in detail, about 80 degrees to 1 degree). Ideally, it is desirable that the angle be 90 degrees. 5 Further, the airflow discharged from the first impeller 21 differs not only from the central axis J in relation to the radial position but also in the radial direction depending on the radial position. The flow velocity is large in the radially outer side of the first wing 211, and the flow velocity is small in the radially inner side. Therefore, the energy loss of the airflow through the support ribs 44 is desired
能於徑向外侧減小。再者，若支持肋44之截面形狀隨著朝 10徑向外侧行進縮小自空氣之流動方向所見的投影面積，則 可減少能量損失。換言之，可使支持肋44之截面形狀係依 徑向適當變化。 支持肋44之截面形狀理想為空氣阻力盡量少的形狀。 第10圖係表衫制44之截面形狀之變胸卜支持肋可 15為第1支持肋24a之氣流上游側及第2支持肋…之氣流 下游側各自形成平滑曲面者。再者，可將第i支持肋⑽ 之氣流上游侧與第2支持肋34b之氣流下游側各自作成銳 20 角的戴面形狀而構成支持肋。更甚者，亦可為僅將第工支 持肋24e之氣紅游側作成平料面⑽第 作成截面菱形之_。或者，亦可—方面僅將第丄支持 肋24d之氣流上游侧作成平滑曲面，而另—方自第^支持 肋24d至第2支持肋34d緩緩地將截面變細般的支持肋。 :此之外，亦可如第1支持肋2枓、第2支持肋34e般將 裁面形狀作献線形狀。此時，通過第丨支持肋仏、第 23 1356879 2支持肋34 e的氣流之能量損失可更加被抑制。但，不論 於哪—種截面形狀中，支持肋皆被配置以使自第1葉輪21 排出的氣流之流速與支持肋截面之長邊方向成為同一方 向〇 以上雖說明了本發明之較佳實施例，但於不脫離本發 明之範圍及精神的範圍中的種種變更、修正係熟習此藝者 所能明瞭者。因此本發明之範圍係僅藉由所附的申請專利 範圍所規定。 【圏式簡單說明】 10 【第1圖】顯示有關於本發明之一實施形態的直列式軸流風 扇之斜視圖。 【第2圖】第1圖之直列式轴流風扇之分解斜視圖。 【第3圖】第1圖之直列式轴流風扇之縱截面圖。 【第4圖】第1圖之直列式軸流風扇之第1轴流風扇之平面 15 圖。 【第5圖】第1圖之直列式軸流風扇之第2軸流風扇之平面 圖。 【第6圖】顯示於第1圖之直列式軸流風扇中的第1支持肋與 第2支持肋之抵接狀態之斜視圖。 20【第7圖】第1圖之直列式軸流風扇（無葉輪）之平面圖。 【第8圖】於第1圖之直列式轴流風扇中的第1支持肋及第2 支持肋之截面圖。 【第9圖】將於第】圖之直列式轴流風扇中的第1翼、第1支 持肋、第2支持肋、第2翼以中心軸j為中心並沿著任意之 24 1356879 直徑之圓弧於軸方向切斷的截面圖。 【第10圖】顯示組合第1支持肋、第2支持肋而得之支持肋 的變形例之圖。Can be reduced on the outside of the radial direction. Further, if the cross-sectional shape of the support rib 44 travels toward the radially outer side of 10 to reduce the projected area seen from the flow direction of the air, the energy loss can be reduced. In other words, the sectional shape of the support ribs 44 can be appropriately changed in the radial direction. The cross-sectional shape of the support ribs 44 is desirably a shape having as little air resistance as possible. Fig. 10 is a view showing a cross-sectional shape of the shirt body 44. The support ribs 15 are those in which the airflow upstream side and the second support ribs of the first support rib 24a form a smooth curved surface. Further, the upstream side of the airflow of the i-th support rib (10) and the downstream side of the airflow of the second support rib 34b may be formed into a shape of a sharp angle of 20 degrees to constitute a support rib. Furthermore, it is also possible to form the flat surface (10) of the gas-supporting side of the first support rib 24e as a cross-section diamond. Alternatively, the upstream side of the airflow of the second support rib 24d may be formed as a smooth curved surface, and the support rib may be gradually tapered from the second support rib 24d to the second support rib 34d. In addition to this, the shape of the cut surface may be a line shape like the first support rib 2枓 and the second support rib 34e. At this time, the energy loss of the airflow passing through the second support rib and the 23 1356879 2 support rib 34 e can be further suppressed. However, in any of the cross-sectional shapes, the support ribs are arranged such that the flow velocity of the airflow discharged from the first impeller 21 is in the same direction as the longitudinal direction of the support rib cross section, and the preferred embodiment of the present invention has been described. For example, various changes and modifications may be made without departing from the scope and spirit of the invention. The scope of the invention is therefore intended to be limited only by the scope of the appended claims. [Brief Description] 10 [First] FIG. 1 is a perspective view showing an in-line axial fan according to an embodiment of the present invention. [Fig. 2] An exploded perspective view of the in-line axial flow fan of Fig. 1. [Fig. 3] A longitudinal sectional view of the in-line axial flow fan of Fig. 1. [Fig. 4] Fig. 1 shows the plane of the first axial fan of the in-line axial fan of Fig. 1. [Fig. 5] A plan view of the second axial fan of the in-line axial flow fan of Fig. 1. Fig. 6 is a perspective view showing a state in which the first support rib and the second support rib are in contact with each other in the in-line axial fan of Fig. 1. 20 [Fig. 7] Plan view of the inline axial fan (without impeller) of Fig. 1. Fig. 8 is a cross-sectional view showing the first support rib and the second support rib in the in-line axial flow fan of Fig. 1. [Fig. 9] The first wing, the first support rib, the second support rib, and the second wing of the in-line axial flow fan of Fig. 1 are centered on the central axis j and along any arbitrary diameter of 24 1356879. A cross-sectional view of the arc cut in the axial direction. Fig. 10 is a view showing a modification of the support rib obtained by combining the first support rib and the second support rib.
【主要元件符號說明】 1...直列式軸流風扇 231...内周面 2...第1軸流風扇 24...第1支持肋 21...第1葉輪 24a...第1支持肋 211…第1翼 24b...第1支持肋 212…轂部 24c…第1支持肋 22...第1馬達部 24d...第1支持肋 221...定子部 24e...第1支持肋 2211...基部 241…第1支持肋第1側面 2212...軸承保持部 242...第1支持肋第2側面 2213".球軸承 243···上端面 2214...球轴承 3…第2轴流風扇 2215...電樞 31...第2葉輪 2216...電路基板 311...第2翼 222...轉子部 312·.·轂部 2221…軛部 3111...前進側翼面 2222...場磁鐵 32...第2馬達部 2223.··軸部 321...定子部 23...第1殼體 3211··.基部 25 1356879 3212···轴承保持部 34a·.·第2支持肋 3213…球轴承 34b··.第2支持肋 3214…球轴承 34c...第2支持肋 3215...電樞 34d...第2支持肋 3216...電路基板 34e...第2支持肋 322...轉子部 341…第2支持肋第1側面 3221…軛部 342…第2支持肋第2側面 3222".場磁鐵 44…支持肋 3223…軸部 441...支持肋第1侧面 33...第2殼體 442…支持肋第2側面 331.. .内周面 34.. .第2支持肋 .J...中心轴 26[Explanation of main component symbols] 1: In-line axial fan 231... inner peripheral surface 2... first axial fan 24... first support rib 21... first impeller 24a... First support rib 211...first wing 24b...first support rib 212...hub portion 24c...first support rib 22...first motor portion 24d...first support rib 221...stator portion 24e ...first support rib 2211...base portion 241...first support rib first side surface 2212...bearing holding portion 242...first support rib second side surface 2213".ball bearing 243···upper end surface 2214...ball bearing 3...second axial fan 2215...armature 31...second impeller 2216...circuit board 311...second wing 222...rotor part 312·.· hub Part 2221, yoke 3111, forward side airfoil 2222, field magnet 32, second motor unit 2223, shaft portion 321, stator portion 23, first housing 3211, . Base portion 25 1356879 3212·· bearing holding portion 34a·.·second support rib 3213...ball bearing 34b··.second support rib 3214...ball bearing 34c...second support rib 3215...armature 34d. .. second support rib 3216...circuit board 34e...second support rib 322...rotor part 341...second support rib first side surface 3221...yoke part 342... 2 support rib second side 3222" field magnet 44... support rib 3223... shaft portion 441... support rib first side 33... second housing 442... support rib second side 331.. inner circumferential surface 34.. . 2nd support rib. J... central axis 26