JP2009013855A - Axial flow fan - Google Patents
Axial flow fan Download PDFInfo
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- JP2009013855A JP2009013855A JP2007175681A JP2007175681A JP2009013855A JP 2009013855 A JP2009013855 A JP 2009013855A JP 2007175681 A JP2007175681 A JP 2007175681A JP 2007175681 A JP2007175681 A JP 2007175681A JP 2009013855 A JP2009013855 A JP 2009013855A
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本発明は、一般に自動車機関等の冷却用として回転駆動する軸流型のエンジン冷却用ファンに係り、より詳しくはボス部（ハブ）の外周面に放射状に延びる複数枚のファンブレードを有する軸流ファンに関するものである。 The present invention generally relates to an axial flow type engine cooling fan that is rotationally driven for cooling an automobile engine or the like, and more specifically, an axial flow having a plurality of fan blades extending radially on the outer peripheral surface of a boss portion (hub). It is about fans.
この種の従来の軸流ファンとしては、例えば図１０（ａ）、（ｂ）に示すように、断面形状が略Ｔ字形の円筒状のボス部（ハブ）１１の外周面に放射状に延びる複数枚のファンブレード１２が突設された構造によって構成されたものが知られている。この軸流ファンの場合は、前記ボス部１１の内周面側のほぼ中央部に軸芯に対しほぼ直角に突出した取付け壁１１ａに相手部材への取付け部材（インサート）１３の一部が埋設されて取付けられている。 As a conventional axial fan of this type, for example, as shown in FIGS. 10A and 10B, a plurality of radial axially extending outer peripheral surfaces of a cylindrical boss portion (hub) 11 having a substantially T-shaped cross section. There has been known one constituted by a structure in which a single fan blade 12 is protruded. In the case of this axial fan, a part of the attachment member (insert) 13 to the mating member is embedded in the attachment wall 11a protruding substantially at right angles to the shaft core at the substantially central portion on the inner peripheral surface side of the boss portion 11. Has been installed.
また、図１１（ａ）、（ｂ）に示すように、円筒環状のボス部（ハブ）２１の外周面に放射状からなる複数枚のファンブレード１２が突設され、かつ前記ボス部２１の内周面側に、軸芯方向に直角な相手部材への取付け部材２３が設けられた軸流ファンであって、前記ボス部２１のファンブレード間の壁部に切欠き送気溝２２が設けられたエンジン冷却用ファン（特許文献１参照）や、図１２（ａ）、（ｂ）に示すように、ボス部３１から放射状に延びる複数枚のファンブレード３２を有する軸流ファンであって、前記ボス部の軸方向端面のうち前記ファンブレード３２の前縁側に位置する曲面３２ａが、この軸端面側からファンブレードの付け根側に設けて構成された射出成型による軸流ファン（特許文献２参照）等が知られている。
しかしながら、前記図１０に示す軸流ファンは、図中に矢印で示すように円筒状のボス部（ハブ）１１の内部へ空気あるいは風が流れ込むことにより渦流が発生し、ボス部１１の前面付近の風や空気の流れが悪化するという欠点がある。また、図１１に示すエンジン冷却用ファンの場合は、ボス部２１内側と該ボス部２１の内周面側に設けられた取付け部材２３との間へ空気あるいは風が流れ込むことにより渦流が発生し、前記の軸流フンと同様、ボス部２１の前面付近の風や空気の流れが悪化するという欠点に加え、ボス部を切欠いているため該ボス部の強度が低いという欠点がある。さらに、図１２に示す軸流ファンの場合は、ファンブレード３２の付け根部の曲面３２ａに沿ってブレード３２の根元を空気が周方向に流れ易いという欠点がある。 However, the axial fan shown in FIG. 10 generates eddy currents when air or wind flows into the inside of the cylindrical boss portion (hub) 11 as indicated by an arrow in the figure, and the vicinity of the front surface of the boss portion 11. There is a disadvantage that the wind and air flow deteriorate. Further, in the case of the engine cooling fan shown in FIG. 11, eddy currents are generated when air or wind flows between the inside of the boss portion 21 and the mounting member 23 provided on the inner peripheral surface side of the boss portion 21. Like the axial flow fan, in addition to the disadvantage that the flow of wind and air near the front surface of the boss portion 21 deteriorates, the boss portion has a notch, so that the strength of the boss portion is low. Further, the axial fan shown in FIG. 12 has a drawback that air easily flows in the circumferential direction through the root of the blade 32 along the curved surface 32 a at the base of the fan blade 32.
本発明は上記した従来の軸流ファンの欠点を解消するためになされたもので、ボス部前面からファンブレードの前縁にかけてガイドベーンを設けることによりファン前方の気流の流れを改善でき、消費馬力を抑えつつ高風量を得ることができると共に、ボス部の強度も高い軸流ファンを提供しようとするものである。 The present invention was made to eliminate the above-mentioned drawbacks of the conventional axial flow fan, and by providing a guide vane from the front surface of the boss portion to the front edge of the fan blade, the flow of the air flow in front of the fan can be improved, and the horsepower consumed It is an object of the present invention to provide an axial fan that can obtain a high air volume while suppressing the boss portion and has a high boss portion strength.
本発明に係る軸流ファンは、ボス部の外周面に放射状に延びる複数枚のファンブレードと前記ボス部前面に放射状に設けるガイドベーンを有する軸流ファンにおいて、前記ガイドベーンがファンブレードの付け根部付近の前縁から当該ブレードの裏面に該ブレードに沿うように回り込んでその先端部がブレード後縁のほぼ中間部まで滑らかな曲面にて延長され、かつ該延長部はさらに前記ボス部外周面に沿って風下側に向って軸方向に延びて当該ボス部外周面を覆うように形成された構造となしていることを特徴とするものである。 The axial fan according to the present invention is an axial fan having a plurality of fan blades extending radially on the outer peripheral surface of the boss portion and guide vanes provided radially on the front surface of the boss portion, wherein the guide vane is a root portion of the fan blade. The leading edge extends from the front edge in the vicinity to the back surface of the blade along the blade, and the tip of the blade extends to a substantially middle portion of the blade trailing edge, and the extended portion further includes the outer peripheral surface of the boss portion. And extending in the axial direction toward the leeward side so as to cover the outer peripheral surface of the boss portion.
また、本発明に係る他の軸流ファンは、ボス部の外周面に放射状に延びる複数枚のファンブレードと前記ボス部前面に放射状に設けるガイドベーンを有する軸流ファンにおいて、前記ガイドベーンがファンブレードの付け根部付近の前縁から当該ブレードの裏面に該ブレードに沿うように回り込んでその先端部がブレード後縁の外周末端部まで滑らかな曲面にて延長され、かつ該延長部はさらに前記ボス部外周面に沿って風下側に向って軸方向に延びて当該ボス部外周面を覆うように形成された構造となしていることを特徴とするものである。 Another axial fan according to the present invention is an axial fan having a plurality of fan blades extending radially on the outer peripheral surface of the boss portion and guide vanes provided radially on the front surface of the boss portion, wherein the guide vane is a fan. From the front edge near the base of the blade to the back surface of the blade so as to follow the blade, its tip is extended with a smooth curved surface to the outer peripheral end of the blade trailing edge, and the extension is further It has a structure that extends in the axial direction along the outer peripheral surface of the boss portion in the axial direction and covers the outer peripheral surface of the boss portion.
本発明の前記軸流ファンにおける前記ガイドベーンは、各ファンブレードに対応して設けられていることを特徴とし、また、前記ガイドベーンは、前記ボス部と一体または別体であることを特徴とするものである。さらに、前記ガイドベーンは、前記ファンブレードの前縁部からボス部中心部に向ってガイド面が凸状に湾曲した形状、あるいは前記ファンブレードの前縁部からブレード後縁のほぼ中間部に向ってガイド面が凸状に湾曲した形状、または前記ファンブレードの前縁部からブレード後縁の外周末端部に向ってガイド面が凸状から凹状に変化して湾曲した形状、さらにはこれらを組み合わせた形状となすことを好ましい態様とするものである。 The guide vane in the axial flow fan of the present invention is provided corresponding to each fan blade, and the guide vane is integral with or separate from the boss portion. To do. Further, the guide vane has a shape in which a guide surface is convexly curved from the front edge portion of the fan blade toward the center portion of the boss portion, or from the front edge portion of the fan blade to a substantially middle portion of the blade rear edge. The guide surface is curved in a convex shape, or the guide surface is curved from a convex shape to a concave shape from the leading edge of the fan blade toward the outer peripheral end of the blade trailing edge, or a combination of these It is a preferable embodiment to have a different shape.
本発明に係る軸流ファンは、ガイドベーンがファンブレードの付け根部付近の前縁から当該ブレードの裏面に該ブレードに沿うように回り込んでその先端部がブレード後縁のほぼ中間部まで滑らかな曲面にて延長され、かつ該延長部はさらに前記ボス部外周面に沿って風下側に向って軸方向に延びて当該ボス部外周面を覆うように形成された構造、またはガイドベーンがファンブレードの付け根部付近の前縁から当該ブレードの裏面に該ブレードに沿うように回り込んでその先端部がブレード後縁の外周末端部まで滑らかな曲面にて延長され、かつ該延長部はさらに前記ボス部外周面に沿って風下側に向って軸方向に延びて当該ボス部外周面を覆うように形成された構造となしたことにより、ファン前方のボス部前面に放射状流れを生起し、かつボス部外周部付近の流れに斜流成分を持つよう空気の流れを著しく改善できると共に、ボス部前面に沿って流れる空気をボス部外周面側へ向って放射状にスムーズにガイドすることができるので、ボス部背面での回り込みも改善されて、消費馬力を抑えつつ高風量を得ることができる。また、ボス部からブレード裏面にわたって設ける前記ガイドベーンにより当該ボス部およびファンブレードが補強されるので、ボス部およびファンブレードの強度の向上にも有効である。 In the axial fan according to the present invention, the guide vane turns from the front edge near the base of the fan blade to the back of the blade so as to follow the blade, and the tip thereof is smooth to the middle part of the blade trailing edge. A structure that is extended by a curved surface, and that the extension portion further extends in the axial direction toward the leeward side along the outer peripheral surface of the boss portion and covers the outer peripheral surface of the boss portion, or a guide vane is a fan blade From the front edge near the base of the blade to the back surface of the blade so as to follow the blade, and the tip of the blade extends to the outer peripheral end of the blade trailing edge with a smooth curved surface. A radial flow is generated on the front surface of the boss part in front of the fan by having a structure that extends in the axial direction along the outer peripheral surface of the part and extends in the axial direction so as to cover the outer peripheral surface of the boss part. The air flow can be remarkably improved so that the flow in the vicinity of the outer periphery of the boss portion has a mixed component, and the air flowing along the front surface of the boss portion can be smoothly guided radially toward the outer surface of the boss portion. Therefore, the wraparound on the back surface of the boss part is also improved, and a high air volume can be obtained while suppressing the power consumption. Further, since the boss portion and the fan blade are reinforced by the guide vanes provided from the boss portion to the back surface of the blade, it is effective for improving the strength of the boss portion and the fan blade.
図１は本発明に係る軸流ファンの第１実施例を示す三面図で、（ａ）は要部正面図、（ｂ）は（ａ）のＡ−Ａ線上の縦断側面図、（ｃ）は（ａ）のＢ−Ｂ線上の横断平面図、図２は同じく本発明の第２実施例を示す三面図で、（ａ）は要部正面図、（ｂ）は（ａ）のＡ−Ａ線上の縦断側面図、（ｃ）は（ａ）のＢ−Ｂ線上の横断平面図、図３は同じく本発明の第３実施例を示す三面図で、（ａ）は要部正面図、（ｂ）は（ａ）のＡ−Ａ線上の縦断側面図、（ｃ）は（ａ）のＢ−Ｂ線上の横断平面図、図４は同じく本発明の第４実施例を示す三面図で、（ａ）は要部正面図、（ｂ）は（ａ）のＡ−Ａ線上の縦断側面図、（ｃ）は（ａ）のＢ矢視図、図５は同じく本発明の第５実施例を示す三面図で、（ａ）は要部正面図、（ｂ）は（ａ）のＡ−Ａ線上の縦断側面図、（ｃ）は（ａ）のＢ矢視図、図６は同じく本発明の第６実施例を示す三面図で、（ａ）は要部正面図、（ｂ）は（ａ）のＡ−Ａ線上の縦断側面図、（ｃ）は（ａ）のＢ矢視図、図７は同じく本発明の第７実施例を示す三面図で、（ａ）は要部正面図、（ｂ）は（ａ）のＡ−Ａ線上の縦断側面図、（ｃ）は（ａ）のＢ−Ｂ線上の横断平面図、図８は同じく本発明の第８実施例を示す三面図で、（ａ）は要部正面図、（ｂ）は（ａ）のＡ−Ａ線上の縦断側面図、（ｃ）は（ａ）のＢ矢視図、図９（ａ）〜（ｆ）は本発明に係る軸流ファンのボス後端とファンブレード後縁およびガイドベーン後端の他の態様例を示す図８（ｃ）相当図であり、１はボス部、１−１はボス部前面、１−２はボス後端、２はファンブレード、２−１はブレードの前縁、２−２はブレードの後縁、２ａ〜２ｈはブレード付け根部、３、３ａ〜３ｈはガイドベーン、３−３はガイドベーン後端、３−４、３−４´は突出部、４はボス部の補強部材を兼ねた相手部材への取付け部材（インサート）である。 FIG. 1 is a three-plane view showing a first embodiment of an axial fan according to the present invention, in which (a) is a front view of the main part, (b) is a longitudinal side view on the AA line of (a), and (c). FIG. 2 is a cross-sectional plan view taken along the line BB of FIG. 2A, FIG. 2 is a three-view drawing showing a second embodiment of the present invention, FIG. 2A is a front view of the main part, and FIG. (C) is a cross-sectional plan view on line BB in (a), FIG. 3 is a three-view drawing showing a third embodiment of the present invention, and (a) is a front view of the main part, (B) is a longitudinal side view on the AA line of (a), (c) is a cross-sectional plan view on the BB line of (a), and FIG. 4 is a trihedral view showing the fourth embodiment of the present invention. , (A) is a front view of the main part, (b) is a longitudinal side view along the line AA of (a), (c) is a view as seen from the arrow B of (a), and FIG. 5 is the fifth embodiment of the present invention. It is a three-view figure which shows an example, (a) is a principal part front view, (b) is A- of (a). (C) is a view in the direction of arrow B in (a), FIG. 6 is a three-view drawing showing the sixth embodiment of the present invention, (a) is a front view of the main part, (b) is ( FIG. 7A is a three-side view showing a seventh embodiment of the present invention, and FIG. 7A is a front view of the main part. , (B) is a longitudinal side view along line AA in (a), (c) is a cross-sectional plan view along line BB in (a), and FIG. 8 is a trihedral view showing the eighth embodiment of the present invention. (A) is a front view of the main part, (b) is a longitudinal side view along the line A-A in (a), (c) is a view taken in the direction of arrow B in (a), and FIGS. FIG. 8 is a view corresponding to FIG. 8C showing another example of the boss rear end, fan blade rear edge and guide vane rear end of the axial flow fan according to the present invention, wherein 1 is a boss portion, and 1-1 is a boss portion. Front, 1-2 is rear end of boss, 2 is fan blade, 2- Is the leading edge of the blade, 2-2 is the trailing edge of the blade, 2a to 2h is the blade root, 3, 3a to 3h are guide vanes, 3-3 is the guide vane rear end, 3-4 and 3-4 'are The projecting part 4 is an attachment member (insert) to the mating member that also serves as a reinforcing member for the boss part.
図１に示す第１実施例の軸流ファンは、断面形状が略コ字形のボス部（ハブ）１の外周面に当該ボス部より放射状に延びる複数枚のファンブレード２を有し、該ファンブレード２のボス部付け根部２ａの前縁２−１および後縁２−２はボス部１の外周面とほぼ面一であって、前記ボス部の前面１−１に複数個の板状のガイドベーン３ａが設けられている。このガイドベーン３ａは、前記ボス部の前面１−１からファンブレード２の付け根部付近の前縁２−１まで延びるボス部前面側延長部３ａ−１と、該ボス部前面側延長部３ａ−１に連なって当該ブレード２の裏面２−３側に該ブレードに沿うように回り込んでその先端部がブレード後縁２−２のほぼ中間部まで滑らかな曲面にて延長されかつ前記ボス部外周面に沿って風下側に向って軸方向に延びて当該ボス部外周面を覆うように形成されたボス部外周面側延長部３ａ−２を有し、前記ボス部前面側延長部３ａ−１とボス部外周面側延長部３ａ−２は、ファンが回転した際に気流が前記ボス部１の中心側から外周部に向って流れるとともにボス部外周を軸方向に流れ、さらにファンブレード２の裏面に沿ってブレード外端側へ流れるように、ファンブレード２の付け根部付近の前縁２−１からボス部中心部へ向ってガイド面が凸状に滑らかに湾曲した形状となし、さらにファンブレードの前縁部からブレード後縁のほぼ中間部に向ってガイド面が凸状に滑らかに湾曲した形状となしている。このガイドベーン３ａのボス部前面１−１側端部は当該ボス部の内周面近傍に位置している。そして、各ガイドベーン３ａはボス部外周面側延長部３ａ−２の部分がファンブレード２間に位置するように各ファンブレード２毎に設けられる。
なお、各ガイドベーン３ａのボス部前面側延長部３ａ−１は、ボス部前面１−１にほぼ垂直に形成されている。４ａは相手部材への取付け部材（インサート）４に設けられた締結用ボルト孔である。
すなわち、かかる構成の軸流ファンは、前記ボス部前面１−１に放射状に設けるガイドベーン３ａを前記ボス部の前面１−１からファンブレード２の付け根部付近の前縁２−１まで延びるボス部前面側延長部３ａ−１と、該ボス部前面側延長部３ａ−１に連なって当該ブレード２の裏面２−３に該ブレードに沿うように回り込んでその先端部がブレード後縁２−２のほぼ中間部まで滑らかな曲面にて延長されかつ前記ボス部外周面に沿って風下側に向って軸方向に延びて当該ボス部外周面を覆うように形成されたボス部外周面側延長部３ａ−２とで構成することにより、ファンが回転した際にボス部前面１−１に添って流れる空気が矢印イで示すように前記ガイドベーン３ａの存在によりボス部外周面側へ放射状にガイドされ、かつボス部外周を軸方向に流れるとともにファンブレード２の裏面に沿ってブレード後縁側へ流れる。
The axial fan of the first embodiment shown in FIG. 1 has a plurality of fan blades 2 extending radially from the boss portion on the outer peripheral surface of a boss portion (hub) 1 having a substantially U-shaped cross section. The front edge 2-1 and the rear edge 2-2 of the boss base 2a of the blade 2 are substantially flush with the outer peripheral surface of the boss part 1, and a plurality of plate-like shapes are formed on the front surface 1-1 of the boss part. Guide vanes 3a are provided. The guide vane 3a includes a boss front surface side extension 3a-1 extending from the front surface 1-1 of the boss portion to a front edge 2-1 near the base of the fan blade 2, and the boss front surface side extension 3a-. 1 is connected to the back surface 2-3 side of the blade 2 so as to follow the blade, and its tip is extended with a smooth curved surface to the substantially middle portion of the blade trailing edge 2-2. A boss part outer peripheral surface side extension part 3a-2 formed so as to extend in the axial direction along the surface toward the leeward side and cover the boss part outer peripheral surface, and the boss part front surface side extension part 3a-1 And the boss part outer peripheral surface side extension part 3a-2, when the fan rotates, the airflow flows from the center side of the boss part 1 toward the outer peripheral part and flows in the axial direction on the outer periphery of the boss part. To flow to the outer edge side of the blade along the back surface, The guide surface has a convex and smoothly curved shape from the front edge 2-1 near the base of the fan blade 2 toward the center of the boss, and further from the front edge of the fan blade to the middle part of the blade rear edge. On the other hand, the guide surface has a convex curved shape. The end portion of the guide vane 3a on the boss portion front surface 1-1 side is located in the vicinity of the inner peripheral surface of the boss portion. Each guide vane 3 a is provided for each fan blade 2 so that the portion of the boss outer peripheral surface side extension 3 a-2 is positioned between the fan blades 2.
In addition, the boss part front surface side extension part 3a-1 of each guide vane 3a is formed substantially perpendicularly to the boss part front surface 1-1. Reference numeral 4a denotes a fastening bolt hole provided in the attachment member (insert) 4 to the mating member.
That is, in the axial fan having such a configuration, the guide vanes 3a provided radially on the front surface 1-1 of the boss portion extend from the front surface 1-1 of the boss portion to the front edge 2-1 near the root portion of the fan blade 2. The front surface side extension portion 3a-1 and the boss portion front surface side extension portion 3a-1 are connected to the back surface 2-3 of the blade 2 so as to follow the blade. The boss part outer peripheral surface side extension is formed so as to be extended to a substantially curved surface of 2 and smoothly extending along the outer peripheral surface of the boss part in the axial direction toward the leeward side and to cover the outer peripheral surface of the boss part. When the fan is rotated, the air flowing along the front surface 1-1 of the boss portion is radially radiated toward the outer peripheral surface side of the boss portion due to the presence of the guide vane 3a as indicated by the arrow a. Guided and outside boss Along the rear surface of the fan blade 2 with flowing axially through the blade trailing edge side.
図２に示す第２実施例の軸流ファンは、ファンブレード２の前縁２−１側のブレード付け根部２ｂがボス部前面１−１より風上側に突出し、かつガイドベーン３ｂのボス部前面側延長部３ｂ−１を前記ボス部前面１−１より風上側に突出しているブレード付け根部２ｂの前縁２−１とほぼ面一になるように形成した以外は、前記図１に示すものと実質的に同じ構造となした軸流ファンを例示したものである。２ｂ−１はそのブレード付け根部の突出部である。
したがって、この第２実施例の軸流ファンにおいても、前記ボス部前面１−１に放射状に設けるガイドベーン３ｂを前記ボス部の前面１−１からファンブレード２の付け根部付近の前縁２−１まで延びるボス部前面側延長部３ｂ−１と、該ボス部前面側延長部３ｂ−１に連なって当該ブレード２の裏面２−３側に該ブレードに沿うように回り込んでその先端部がブレード後縁２−２のほぼ中間部まで滑らかな曲面にて延長されかつ前記ボス部外周面に沿って風下側に向って軸方向に延びて当該ボス部外周面を覆うように形成されたボス部外周面側延長部３ｂ−２とで構成することにより、ファンが回転した際にボス部前面１−１に添って流れる空気が矢印ロで示すように前記ガイドベーン３ｂの存在によりボス部外周面側へ放射状にガイドされ、かつボス部外周を軸方向に流れるとともにファンブレード２の裏面に沿ってブレード後縁側へ流れる。
In the axial fan of the second embodiment shown in FIG. 2, the blade root portion 2b on the front edge 2-1 side of the fan blade 2 protrudes to the windward side from the boss portion front surface 1-1, and the boss portion front surface of the guide vane 3b. 1 except that the side extension 3b-1 is formed so as to be substantially flush with the front edge 2-1 of the blade root 2b protruding from the boss front surface 1-1 to the windward side. And an axial fan having substantially the same structure as the above. 2b-1 is a protrusion of the blade root.
Therefore, also in the axial fan of the second embodiment, the guide vanes 3b provided radially on the front surface 1-1 of the boss portion are provided with the front edge 2- near the root portion of the fan blade 2 from the front surface 1-1 of the boss portion. The boss part front surface side extension part 3b-1 extending to 1 and the boss part front surface side extension part 3b-1 are connected to the back surface 2-3 side of the blade 2 so as to follow the blade and the tip part thereof A boss that is extended to a substantially curved portion up to substantially the middle portion of the blade trailing edge 2-2 and extends in the axial direction toward the leeward side along the outer peripheral surface of the boss portion so as to cover the outer peripheral surface of the boss portion. When the fan is rotated, the air flowing along the front surface 1-1 of the boss portion is indicated by the arrow b so that the outer periphery of the boss portion is formed by the presence of the guide vane 3b. Guided radially to the surface side And it flows to the blade trailing edge side along the rear surface of the fan blade 2 with flowing boss outer periphery in the axial direction.
図３に示す第３実施例の軸流ファンは、ガイドベーン３ｃのボス部前面側延長部３ｃ−１を前記ボス部前面１−１より風上側に突出したブレード付け根部２ｃの前記突出部２ｃ−１よりさらに前方へ突出するように形成した以外は、前記図２に示すものと実質的に同じ構造となした軸流ファンを例示したものである。
したがって、この第３実施例の軸流ファンにおいても、前記ボス部前面側延長部３ｃ−１とボス部外周面側延長部３ｃ−２とで形成されたガイドベーン３ｃの作用により、前記第２実施例の軸流ファンと同様、ファンが回転した際にボス部前面１−１に添って流れる空気が矢印ハで示すように前記ガイドベーン３ｃの存在によりボス部外周面側へ放射状にガイドされ、かつボス部外周を軸方向に流れるとともにファンブレード２の裏面に沿ってブレード後縁側へ流れる。
In the axial fan of the third embodiment shown in FIG. 3, the protruding portion 2c of the blade root portion 2c in which the boss portion front surface side extension portion 3c-1 of the guide vane 3c protrudes to the windward side from the boss portion front surface 1-1. 2 illustrates an axial fan having substantially the same structure as that shown in FIG. 2 except that it is formed so as to protrude further forward than -1.
Therefore, also in the axial flow fan of this 3rd Example, by the effect | action of the guide vane 3c formed of the said boss part front surface side extension part 3c-1 and the boss part outer peripheral surface side extension part 3c-2, said 2nd Similar to the axial fan of the embodiment, the air flowing along the front surface 1-1 of the boss portion when the fan rotates is guided radially to the outer peripheral surface side of the boss portion by the presence of the guide vane 3c as indicated by the arrow C. And flows along the outer periphery of the boss portion in the axial direction and flows along the back surface of the fan blade 2 toward the blade trailing edge.
次に、図４〜図６に示す第４〜第６実施例の軸流ファンは、前記ガイドベーン３ａ〜３ｃのボス部外周面側延長部３ａ−２〜３ｃ−２の先端部をさらにブレード後縁の外周末端部まで延長して形成した軸流ファンを例示したものである。
まず、図４に示す第４実施例の軸流ファンは、前記図１に示す第１実施例のものと同様、断面形状が略コ字形のボス部（ハブ）１の外周面に当該ボス部より放射状に延びる複数枚のファンブレード２を有し、該ファンブレード２のボス部付け根部２ｄの前縁２−１および後縁２−２はボス部１の外周面とほぼ面一であって、前記ボス部の前面１−１に複数個の板状のガイドベーン３ｄが設けられている。このガイドベーン３ｄは、前記ボス部の前面１−１からファンブレード２の付け根部付近の前縁２−１まで延びるボス部前面側延長部３ｄ−１と、該ボス部前面側延長部３ｄ−１に連なって当該ブレード２の裏面２−３側に該ブレードに沿うように回り込んでその先端部がブレード後縁２−２の外周末端部まで滑らかな曲面にて延長され、該延長部はさらに前記ボス部外周面に沿って風下側に向って軸方向に延びて当該ボス部外周面を覆うように形成されたボス部外周面側延長部３ｄ−２を有し、前記ボス部前面側延長部３ｄ−１とボス部外周面側延長部３ｄ−２は、ファンが回転した際に気流が前記ボス部１の中心側から外周部に向って流れるとともにボス部外周を軸方向に流れ、さらにファンブレード２の裏面に沿ってブレード末端側へ流れるように、ファンブレード２の付け根部付近の前縁２−１からボス部中心部へ向ってガイド面が凸状に滑らかに湾曲した形状となし、さらにファンブレードの前縁部からブレード後縁の外周末端部に向ってガイド面が凸状から凹状に滑らかに変化して湾曲した形状となしている。このガイドベーン３ｄのボス部前面１−１側端部は当該ボス部の内周面近傍に位置している。そして、各ガイドベーン３ｄはボス部外周面側延長部３ｄ−２の部分がファンブレード２間に位置するように各ファンブレード２毎に設けられる。なお、各ガイドベーン３ｄのボス部前面側延長部３ｄ−１は、ボス部前面１−１にほぼ垂直に形成されている。４ａは相手部材への取付け部材（インサート）４に設けられた締結用ボルト孔である。
すなわち、かかる構成の軸流ファンは、前記ボス部前面１−１に放射状に設けるガイドベーン３ｄを前記ボス部の前面１−１からファンブレード２の付け根部付近の前縁２−１まで延びるボス部前面側延長部３ｄ−１と、該ボス部前面側延長部３ｄ−１に連なって当該ブレード２の裏面２−３側に該ブレードに沿うように回り込んでその先端部がブレード後縁２−２の外周末端部まで滑らかな曲面にて延長されかつ前記ボス部外周面に沿って風下側に向って軸方向に延びて当該ボス部外周面を覆うように形成されたボス部外周面側延長部３ｄ−２とで構成することにより、ファンが回転した際にボス部前面１−１に添って流れる空気が矢印ニで示すように前記ガイドベーン３ｄの存在によりボス部外周面側へ放射状にガイドされ、かつボス部外周を軸方向に流れるとともにファンブレード２の裏面に沿ってブレード外周末端側へ流れるように構成したものである。
Next, the axial fans of the fourth to sixth embodiments shown in FIG. 4 to FIG. 6 further include blades at the tips of the boss part outer peripheral surface side extensions 3a-2 to 3c-2 of the guide vanes 3a to 3c. The axial fan formed by extending to the outer peripheral end of the trailing edge is illustrated.
First, the axial fan of the fourth embodiment shown in FIG. 4 is similar to that of the first embodiment shown in FIG. 1 on the outer peripheral surface of the boss portion (hub) 1 having a substantially U-shaped cross section. A plurality of fan blades 2 extending radially are provided, and the front edge 2-1 and the rear edge 2-2 of the base portion 2d of the boss portion of the fan blade 2 are substantially flush with the outer peripheral surface of the boss portion 1. A plurality of plate-like guide vanes 3d are provided on the front surface 1-1 of the boss portion. The guide vane 3d includes a boss front surface side extension 3d-1 extending from the front surface 1-1 of the boss portion to a front edge 2-1 near the base of the fan blade 2, and the boss front surface extension 3d-. 1 is connected to the back surface 2-3 side of the blade 2 so as to follow the blade, and the tip portion thereof is extended to the outer peripheral end portion of the blade trailing edge 2-2 with a smooth curved surface. Furthermore, it has a boss part outer peripheral surface side extension part 3d-2 formed so as to extend in the axial direction along the outer peripheral surface of the boss part and cover the outer peripheral surface of the boss part, and on the front side of the boss part The extension part 3d-1 and the boss part outer peripheral surface side extension part 3d-2 flow in the axial direction around the boss part outer periphery while the airflow flows from the center side of the boss part 1 toward the outer peripheral part when the fan rotates. Furthermore, along the back of the fan blade 2, toward the blade end side As shown in the figure, the guide surface has a convex and smoothly curved shape from the front edge 2-1 near the base of the fan blade 2 toward the center of the boss, and further from the front edge of the fan blade to the blade rear edge. The guide surface has a curved shape that smoothly changes from a convex shape to a concave shape toward the outer peripheral end portion. The end portion of the guide vane 3d on the boss portion front surface 1-1 side is located in the vicinity of the inner peripheral surface of the boss portion. Each guide vane 3 d is provided for each fan blade 2 so that the boss portion outer peripheral surface side extension 3 d-2 is positioned between the fan blades 2. In addition, the boss part front surface side extension part 3d-1 of each guide vane 3d is formed substantially perpendicular to the boss part front surface 1-1. Reference numeral 4a denotes a fastening bolt hole provided in the attachment member (insert) 4 to the mating member.
That is, in the axial fan having such a configuration, the guide vanes 3d provided radially on the front surface 1-1 of the boss portion extend from the front surface 1-1 of the boss portion to the front edge 2-1 near the root portion of the fan blade 2. The front surface side extension portion 3d-1 and the boss portion front surface side extension portion 3d-1 are connected to the back surface 2-3 side of the blade 2 so as to follow the blade, and the tip portion thereof is the blade trailing edge 2. -2 outer peripheral surface side extended to a smooth curved surface to the outer peripheral end of -2 and extending in the axial direction toward the leeward side along the outer peripheral surface of the boss portion so as to cover the outer peripheral surface of the boss portion By constituting the extension portion 3d-2, the air flowing along the front surface 1-1 of the boss portion when the fan rotates is radiated radially toward the outer peripheral surface side of the boss portion due to the presence of the guide vane 3d as indicated by an arrow D. Guided by the boss With flowing circumferential axially those configured to flow to the blade outer peripheral end side along the rear surface of the fan blade 2.
図５に示す第５実施例の軸流ファンは、前記図２に示す第２実施例のものと同様、ファンブレード２の前縁２−１側のブレード付け根部２ｅがボス部前面１−１より風上側に突出し、かつガイドベーン３ｅのボス部前面側延長部３ｅ−１を前記ボス部前面１−１より風上側に突出しているブレード付け根部２ｅの前縁２−１とほぼ面一になるように形成した以外は、前記図４に示すものと実質的に同じ構造となした軸流ファンを例示したものである。２ｅ−１はそのブレード付け根部の突出部である。
したがって、この第５実施例の軸流ファンにおいても、前記ボス部前面１−１に放射状に設けるガイドベーン３ｅを前記ボス部の前面１−１からファンブレード２の付け根部付近の前縁２−１まで延びるボス部前面側延長部３ｅ−１と、該ボス部前面側延長部３ｅ−１に連なって当該ブレード２の裏面２−３側に該ブレードに沿うように回り込んでその先端部がブレード後縁２−２の外周末端部まで滑らかな曲面にて延長されかつ前記ボス部外周面に沿って風下側に向って軸方向に延びて当該ボス部外周面を覆うように形成されたボス部外周面側延長部３ｅ−２とで構成することにより、ファンが回転した際にボス部前面１−１に添って流れる空気が矢印ホで示すように前記ガイドベーン３ｅの存在によりボス部外周面側へ放射状にガイドされ、かつボス部外周を軸方向に流れるとともにファンブレード２の裏面に沿ってブレード外周末端側へ流れる。
In the axial fan of the fifth embodiment shown in FIG. 5, the blade root 2e on the front edge 2-1 side of the fan blade 2 is the front surface 1-1 of the boss portion, as in the second embodiment shown in FIG. The boss part front surface side extension 3e-1 of the guide vane 3e protrudes further to the windward side and is substantially flush with the front edge 2-1 of the blade root part 2e protruding from the boss front surface 1-1 to the windward side. The axial flow fan having substantially the same structure as that shown in FIG. 4 is illustrated except that it is formed as described above. 2e-1 is the protrusion of the blade root.
Therefore, also in the axial fan of the fifth embodiment, the guide vanes 3e provided radially on the front surface 1-1 of the boss portion are provided with the front edge 2- near the root portion of the fan blade 2 from the front surface 1-1 of the boss portion. The boss part front surface side extension part 3e-1 extending to 1 and the boss part front surface side extension part 3e-1 are connected to the back surface 2-3 side of the blade 2 so as to follow the blade, and the tip part thereof A boss that is extended to the outer peripheral end portion of the blade trailing edge 2-2 with a smooth curved surface and extends in the axial direction toward the leeward side along the outer peripheral surface of the boss portion so as to cover the outer peripheral surface of the boss portion. When the fan is rotated, the air flowing along the front surface 1-1 of the boss portion is indicated by an arrow e so that the outer periphery of the boss portion is formed by the presence of the guide vane 3e. Guided radially to the surface side And it flows to the blade outer peripheral end side along the rear surface of the fan blade 2 with flowing boss outer periphery in the axial direction.
図６に示す第６実施例の軸流ファンは、前記図３に示す第３実施例のものと同様、ファンブレード２の前縁２−１側のブレード付け根部２ｆがボス部前面１−１より風上側に突出し、かつガイドベーン３ｆのボス部前面側延長部３ｆ−１を前記ボス部前面１−１より風上側に突出しているブレード付け根部２ｆの前縁突出部２ｆ−１よりさらに前方へ突出するように形成した以外は、前記図５に示すものと実質的に同じ構造となした軸流ファンを例示したものである。
したがって、この第６実施例の軸流ファンにおいても、前記ボス部前面側延長部３ｆ−１とボス部外周面側延長部３ｆ−２とで形成されたガイドベーン３ｆの作用により、前記第５実施例の軸流ファンと同様、ファンが回転した際にボス部前面１−１に添って流れる空気が矢印ヘで示すようにボス部外周面側へ放射状にガイドされ、かつボス部外周を軸方向に流れるとともにファンブレード２の裏面に沿ってブレード末端外周側へ流れる。
The axial fan of the sixth embodiment shown in FIG. 6 has a blade root 2f on the front edge 2-1 side of the fan blade 2 in the same manner as that of the third embodiment shown in FIG. Further forward of the front edge protrusion 2f-1 of the blade root 2f that protrudes further to the windward side and the boss front surface side extension 3f-1 of the guide vane 3f protrudes to the windward side than the boss front surface 1-1. Except that it is formed so as to protrude to the right, an axial fan having substantially the same structure as that shown in FIG. 5 is illustrated.
Therefore, also in the axial fan of the sixth embodiment, the guide vane 3f formed by the boss portion front surface side extension portion 3f-1 and the boss portion outer peripheral surface side extension portion 3f-2 has the function of the fifth fan. Similar to the axial fan of the embodiment, when the fan rotates, the air flowing along the front surface 1-1 of the boss portion is guided radially to the outer peripheral surface side of the boss portion as indicated by an arrow, and the outer periphery of the boss portion is pivoted. And flows toward the outer peripheral side of the blade end along the back surface of the fan blade 2.
図７に示す第７実施例の軸流ファンは、ガイドベーンのボス部前面１−１側の湾曲形状を変えた以外は、前記図１に示す第１実施例のものと実質的に同じ構造となした軸流ファンを例示したものである。すなわち、この第７実施例の軸流ファンのガイドベーン３ｇは、前記ボス部の前面１−１からファンブレード２の付け根部付近の前縁２−１まで延びるボス部前面側延長部３ｇ−１の形状を前記ボス部の内周側から外周面側に向ってガイド面を凹状から凸状に途中から変えて湾曲した形状となしたものである。２ｇはブレード付け根部である。
したがって、この第７実施例の軸流ファンにおいても、前記ボス部前面側延長部３ｇ−１とボス部外周面側延長部３ｇ−２とで形成されたガイドベーン３ｇの作用により、前記第１実施例の軸流ファンと同様、ファンが回転した際にボス部前面１−１に添って流れる空気が矢印トで示すようにボス部外周面側へ放射状にガイドされ、かつボス部外周を軸方向に流れるとともにファンブレード２の裏面に沿ってブレード後縁側へ流れる。
The axial fan of the seventh embodiment shown in FIG. 7 has substantially the same structure as that of the first embodiment shown in FIG. 1 except that the curved shape of the boss portion front surface 1-1 side of the guide vane is changed. This is an example of an axial flow fan. That is, the guide vane 3g of the axial fan according to the seventh embodiment has a boss front surface side extension 3g-1 extending from the front surface 1-1 of the boss part to the front edge 2-1 near the root of the fan blade 2. The guide surface is changed from a concave shape to a convex shape toward the outer peripheral surface side from the inner peripheral side to the outer peripheral surface side of the boss portion, so that a curved shape is obtained. 2g is a blade root.
Therefore, also in the axial fan of the seventh embodiment, the first vane 3g formed by the boss portion front surface side extension portion 3g-1 and the boss portion outer peripheral surface side extension portion 3g-2 acts as the first fan. As with the axial flow fan of the embodiment, when the fan rotates, the air flowing along the front surface 1-1 of the boss portion is guided radially toward the outer peripheral surface side of the boss portion as indicated by arrows G, and the outer periphery of the boss portion is pivoted. And flows to the trailing edge side of the blade along the back surface of the fan blade 2.
図８に示す第８実施例の軸流ファンは、ガイドベーンのボス部前面１−１側の湾曲形状を変えた以外は、前記図４に示す第１実施例のものと実質的に同じ構造となした軸流ファンを例示したものである。すなわち、この第８実施例の軸流ファンのガイドベーン３ｈは、前記図７に示すものと同様、前記ボス部の前面１−１からファンブレード２の付け根部付近の前縁２−１まで延びるボス部前面側延長部３ｈ−１の形状を前記ボス部の内周側から外周面側に向ってガイト面を凹状から凸状に途中から変えて湾曲した形状となしたものである。２ｈはブレード付け根部である。
したがって、この第８実施例の軸流ファンにおいても、前記ボス部前面側延長部３ｈ−１とボス部外周面側延長部３ｈ−２とで形成されたガイドベーン３ｈの作用により、前記第７実施例の軸流ファンと同様、ファンが回転した際にボス部前面１−１に添って流れる空気が矢印チで示すようにボス部外周面側へ放射状にガイドされ、かつボス部外周を軸方向に流れるとともにファンブレード２の裏面に沿ってブレード外周末端側へ流れる。
The axial fan of the eighth embodiment shown in FIG. 8 has substantially the same structure as that of the first embodiment shown in FIG. 4 except that the curved shape of the guide vane on the boss front surface 1-1 side is changed. This is an example of an axial flow fan. That is, the guide vane 3h of the axial fan according to the eighth embodiment extends from the front surface 1-1 of the boss portion to the front edge 2-1 near the base portion of the fan blade 2 as shown in FIG. The shape of the boss portion front surface side extension 3h-1 is changed from the inner peripheral side to the outer peripheral surface side of the boss portion, and the guide surface is changed from a concave shape to a convex shape from the middle to have a curved shape. 2h is a blade root.
Therefore, also in the axial fan of the eighth embodiment, the seventh vane is formed by the action of the guide vane 3h formed by the boss portion front surface side extension portion 3h-1 and the boss portion outer peripheral surface side extension portion 3h-2. Similar to the axial fan of the embodiment, when the fan rotates, the air flowing along the front surface 1-1 of the boss portion is radially guided to the outer peripheral surface side of the boss portion as indicated by an arrow H, and the outer periphery of the boss portion is pivoted. And flows in the direction along the back surface of the fan blade 2 toward the blade outer peripheral end.
以上、本発明の第１実施例〜第８実施例の軸流ファンについて説明したが、本発明に係る軸流ファンのボス後端とファンブレード後縁およびガイドベーン後端の態様については、前記のものに限定されるものではなく、例えば図９（ａ）〜（ｆ）に示す態様も含まれることはいうまでもない。
すなわち、図９（ａ）に示すボス後端とファンブレード後縁およびガイドベーン後端の態様例は、軸流ファンのボス後端１−２とファンブレード２の外周の当該ブレード後縁２−２が面一で、かつガイドベーン後端３−３ラインがボス後端１−２ラインと面一となした態様例である。同図（ｂ）は、ボス後端１−２よりファンブレード２外周の当該ブレード後縁２−２が風上側で、かつガイドベーン後端３−３のラインがボス後端１−２ラインより風上側にテーパ状となした態様例である。同図（ｃ）は、ボス後端１−２よりファンブレード２外周の当該ブレード後縁２−２が風下側で、かつガイドベーン後端３−３ラインがボス後端１−２ラインより風下側でテーパ状となした態様例である。同図（ｄ）は、ガイドベーン３の外周先端がファンブレード２の後縁２−２と面一となした態様例である。同図（ｅ）は、ファンブレード２とガイドベーンが一体に成形され、ガイドベーン後端３−３に、当該ガイドベーン３の外周先端がボス後端１−２ラインと面一のファンブレード２の後縁２−２相当部（鎖線で示す）より風下側へ一体に突出した突出部３−４を有する態様例である。同図（ｆ）は、ファンブレード２とガイドベーンが別体に成形され、ガイドベーン後端３−３に、当該ガイドベーン３の外周先端がボス後端１−２ラインと面一のファンブレード２の後縁２−２より風下側に突出したブレード２とは別体の突出部３−４´を有する態様例である。
As described above, the axial fans according to the first to eighth embodiments of the present invention have been described. However, the aspect of the boss rear end, fan blade rear edge, and guide vane rear end of the axial flow fan according to the present invention is described above. It is needless to say that the embodiments shown in FIGS. 9A to 9F are also included, for example.
That is, the boss rear end, the fan blade rear edge, and the guide vane rear end, as shown in FIG. 9A, are arranged in the axial boss rear end 1-2 and the blade rear edge 2- This is an example in which 2 is flush and the guide vane trailing edge 3-3 line is flush with the boss trailing edge 1-2 line. In FIG. 5B, the blade trailing edge 2-2 on the outer periphery of the fan blade 2 from the boss rear end 1-2 is on the windward side, and the line of the guide vane rear end 3-3 is from the boss rear end 1-2 line. It is the example which became a taper shape on the windward side. FIG. 4C shows the blade trailing edge 2-2 on the outer periphery of the fan blade 2 from the boss rear end 1-2 on the leeward side, and the guide vane rear end 3-3 line leeward from the boss rear end 1-2 line. This is an example of a tapered shape on the side. FIG. 4D is an example in which the outer peripheral tip of the guide vane 3 is flush with the rear edge 2-2 of the fan blade 2. In FIG. 4E, the fan blade 2 and the guide vane are formed integrally, and the fan blade 2 with the outer peripheral front end of the guide vane 3 flush with the boss rear end 1-2 line is formed at the guide vane rear end 3-3. It is an example which has the protrusion part 3-4 which protruded integrally from the rear edge 2-2 equivalent part (it shows with a dashed line) to the leeward side. FIG. 6 (f) shows the fan blade 2 and the guide vane formed separately, and the guide vane rear end 3-3 has a fan blade whose outer peripheral front end is flush with the boss rear end 1-2 line. 2 is a mode example having a protruding portion 3-4 ′ separate from the blade 2 protruding to the leeward side from the rear edge 2-2.
なお、本発明にかかる前記軸流ファンは、樹脂材による射出成型あるいはアルミニウムまたはアルミニウム合金材による鋳造成型等によってファンブレード２およびガイドベーン３ａ〜３ｈをボス部１と一体に設けるか、あるいはガイドベーン３ａ〜３ｈをボス部と別体のものを取着して設ける。 In the axial fan according to the present invention, the fan blade 2 and the guide vanes 3a to 3h are provided integrally with the boss portion 1 by injection molding using a resin material or casting molding using aluminum or an aluminum alloy material, or guide vanes. 3a to 3h are provided separately from the boss.
本発明者らの実験によれば、例えば、本発明の軸流ファンと従来の軸流ファンを使用して、１３００ｒｐｍで回転させ同じ車輌抵抗で送風した場合の風量を比較すると、送風風量は２．２〜１０．４％程度以上向上する結果が得られた。 According to the experiments by the present inventors, for example, when the axial flow fan of the present invention and a conventional axial flow fan are used and the airflow when rotating at 1300 rpm and blowing with the same vehicle resistance is compared, the blown airflow is 2 A result of improvement of about 2 to 10.4% or more was obtained.
本発明は、ボス部前面に放射状に設けるガイドベーンをファンブレードの付け根部付近の前縁から当該ブレードの裏面側に該ブレードに沿うように回り込ませてその先端部をブレード後縁のほぼ中間部まで滑らかな曲面にて延長し、かつ該延長部をさらに前記ボス部外周面に沿って風下側に向って軸方向に延ばして当該ボス部外周面を覆うように形成した構造、またはガイドベーンをファンブレードの付け根部付近の前縁から当該ブレードの裏面側に該ブレードに沿うように回り込んでその先端部をブレード後縁の外周末端部まで滑らかな曲面にて延長し、かつ該延長部をさらに前記ボス部外周面に沿って風下側に向って軸方向に延びて当該ボス部外周面を覆うように形成した構造としたことにより、ファン前方のボス部前面に放射状流れを生起し、かつボス部外周部付近の流れに斜流成分を持つよう空気の流れを著しく改善できると共に、ボス部前面に沿って流れる空気をボス部外周面側へ向って放射状にスムーズにガイドすることができるので、ボス部背面での回り込みも改善されて、消費馬力を抑えつつ高風量を得ることができる。また、ボス部からブレード裏面にわたって設ける前記ガイドベーンにより当該ボス部およびファンブレードが補強されるので、ボス部およびファンブレードの強度の向上にも有効である。したがって、本発明は、より品質的に優れた軸流ファンを実現でき、自動車機関等の冷却用として回転駆動する軸流型のエンジン冷却用ファンのみならず、各種動力機関の冷却用ファン等にも適用可能である。 In the present invention, a guide vane provided radially on the front surface of the boss portion is turned from the front edge near the base portion of the fan blade to the back surface side of the blade so as to follow the blade, and the tip portion thereof is substantially the middle portion of the blade rear edge. A structure that is extended to a smooth curved surface, and the extension portion is further extended in the axial direction along the outer peripheral surface of the boss portion toward the leeward side so as to cover the outer peripheral surface of the boss portion, or a guide vane. From the front edge near the base part of the fan blade, wrap around the blade to the back side of the blade, extend its tip part to the outer peripheral end part of the blade rear edge with a smooth curved surface, and extend the extension part. Furthermore, by forming a structure that extends in the axial direction along the outer peripheral surface of the boss portion and covers the outer peripheral surface of the boss portion, a radial flow is generated on the front surface of the boss portion in front of the fan. The air flow can be remarkably improved so that it has a mixed component in the flow around the outer periphery of the boss, and the air flowing along the front surface of the boss is smoothly guided radially toward the outer surface of the boss. Therefore, the wraparound on the back surface of the boss part is improved, and a high air volume can be obtained while suppressing the power consumption. Further, since the boss portion and the fan blade are reinforced by the guide vanes provided from the boss portion to the back surface of the blade, it is effective for improving the strength of the boss portion and the fan blade. Therefore, the present invention can realize an axial fan with better quality, and can be used not only for an axial-flow type engine cooling fan that is rotationally driven for cooling an automobile engine, but also for a cooling fan for various power engines. Is also applicable.
１ ボス部
１−１ ボス部前面
１−２ ボス後端
２ ファンブレード
２−１ ブレードの前縁
２−２ ブレードの後縁
２ａ〜２ｈ ブレード付け根部
３、３ａ〜３ｈ ガイドベーン
３−３ ガイドベーン後端
３−４、３−４´ 突出部
４ 相手部材への取付け部材（インサート）
DESCRIPTION OF SYMBOLS 1 Boss part 1-1 Boss part front surface 1-2 Boss rear end 2 Fan blade 2-1 Blade front edge 2-2 Blade rear edge 2a-2h Blade root part 3, 3a-3h Guide vane 3-3 Guide vane Rear end 3-4, 3-4 'Protrusion 4 Attachment member (insert) to mating member
Claims (7)
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| JP2016066099A (en) * | 2009-09-04 | 2016-04-28 | 株式会社半導体エネルギー研究所 | Semiconductor device |
| WO2018198799A1 (en) * | 2017-04-27 | 2018-11-01 | 日本電産株式会社 | Blower device |
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| JP2003214389A (en) * | 2002-01-21 | 2003-07-30 | Nippon Densan Corp | Impeller for fan |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016066099A (en) * | 2009-09-04 | 2016-04-28 | 株式会社半導体エネルギー研究所 | Semiconductor device |
| US10134912B2 (en) | 2009-09-04 | 2018-11-20 | Semiconductor Energy Laboratory Co., Ltd. | Display device and electronic device |
| US10700215B2 (en) | 2009-09-04 | 2020-06-30 | Semiconductor Energy Laboratory Co., Ltd. | Display device and electronic device |
| US11069817B2 (en) | 2009-09-04 | 2021-07-20 | Semiconductor Energy Laboratory Co., Ltd. | Display device and electronic device |
| US11430899B2 (en) | 2009-09-04 | 2022-08-30 | Semiconductor Energy Laboratory Co., Ltd. | Display device and electronic device |
| US11652174B2 (en) | 2009-09-04 | 2023-05-16 | Semiconductor Energy Laboratory Co., Ltd. | Display device and electronic device |
| WO2018198799A1 (en) * | 2017-04-27 | 2018-11-01 | 日本電産株式会社 | Blower device |
| CN110537026A (en) * | 2017-04-27 | 2019-12-03 | 日本电产株式会社 | Air supply device |
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