JP4925946B2 - Axial fan - Google Patents
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- JP4925946B2 JP4925946B2 JP2007175678A JP2007175678A JP4925946B2 JP 4925946 B2 JP4925946 B2 JP 4925946B2 JP 2007175678 A JP2007175678 A JP 2007175678A JP 2007175678 A JP2007175678 A JP 2007175678A JP 4925946 B2 JP4925946 B2 JP 4925946B2
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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８（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. 8A and 8B, a plurality of radial axially extending outer peripheral surfaces of a cylindrical boss portion (hub) 11 having a substantially T-shaped cross section. A structure in which a single fan blade 12 is protruded is known. 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９（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１０（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８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９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１０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に沿ってプレード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. 8 generates a vortex when air or wind flows into 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. 9, 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. 10 has a drawback that air easily flows in the circumferential direction along the base 32 of the blade 32 along the curved surface 32a of 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まで延長され、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。
この軸流ファンにおいて、前記ガイドベーンは、そのボス部外周面に沿って形成される部分が前記ファンブレード間に位置するように設けることが好ましく、また、前記ボス部と一体または別体のどちらでもよく、さらに、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の湾曲した形状に形成してもよい。
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 extension extends to the front edge in the vicinity, and the extension is further formed in the axial direction toward the leeward side along the outer peripheral surface of the boss part.
In this axial fan, the guide vane is preferably provided so that a portion formed along the outer peripheral surface of the boss portion is located between the fan blades. Further, the guide surface may be formed in a curved shape with a convex shape from the front edge of the fan blade toward the center of the boss.
本発明に係る軸流ファンは、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前縁まで延長し、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、ボス部に設ける前記ガイドベーンにより当該ボス部が補強されるので、ボス部の強度の向上にも有効である。 The axial fan according to the present invention extends guide vanes radially provided on the front surface of the boss portion to the front edge of the fan blade, and further extends the extension portion along the outer peripheral surface of the boss portion toward the leeward side in the axial direction. With the formed structure, a radial flow is generated on the front surface of the boss part in front of the fan, and the air flow can be remarkably improved so that the flow in the vicinity of the outer peripheral part of the boss part has a mixed flow component, and along the front surface of the boss part. Since the air flowing in the direction toward the outer peripheral surface of the boss portion can be smoothly guided radially, the wraparound on the rear surface of the boss portion is improved, and a high air volume can be obtained while suppressing the horsepower consumption. Moreover, since the said boss | hub part is reinforced by the said guide vane provided in a boss | hub part, it is effective also in the improvement of the intensity | strength of a boss | hub part.
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−Ｂ線上の横断平面図、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−Ｂ線上の横断平面図、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−Ｂ線上の横断平面図、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線上の横断平面図であり、１はボス部、１−１はボス部前面、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〜２ｇはブレード付け根部、３ａ〜３ｇはガイドベーン、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 cross-sectional plan view along the line BB of (a), and FIG. It is a three-view figure which shows 5th Example of this, (a) is a principal part front view, (b) (A) Vertical side view on the AA line, (c) is a cross-sectional plan view on the BB line in (a), and FIG. 6 is a trihedral view showing the sixth embodiment of the present invention. Is a front view of the main part, (b) is a longitudinal side view on line AA in (a), (c) is a transverse plan view on line BB in (a), and FIG. 7 is also a seventh embodiment of the present invention. It is a three-plane figure which shows an example, (a) is a principal part front view, (b) is a vertical side view on the AA line of (a), (c) is a cross-sectional plan view on the BB line of (a). Yes, 1 is the boss portion, 1-1 is the front surface of the boss portion, 2 is the fan blade, 2-1 is the leading edge of the blade, 2-2 is the trailing edge of the blade, 2a to 2g are the blade root portions, and 3a to 3g are Guide vanes 4 are attachment members (inserts) to a mating member that also serve as a reinforcing member for the boss portion.
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、該延長部３ａ−１から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直角に延びるボス部外周面側延長部３ａ−２を有し、かつ前記ボス部前面側延長部３ａ−１はファンが回転した際に気流が前記ボス部１の中心から外周部に向って流れるように、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の滑らかに湾曲した形状となしており、該ガイドベーン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、ボス部外周面側端部は当該ボス部外周面の風下側端部に位置している。そして、各ガイドベーン３ａはボス部外周面側延長部３ａ−２の部分が前記ファンブレード２間に位置するように設けられる。また、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をファンブレード２の付け根部付近の前縁まで延長して形成したボス部前面側延長部３ａ−１と、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直角に延長して形成したボス部外周面側延長部３ａ−２とで形成することにより、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ように構成したものである。
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 part to a front edge 2-1 near the base of the fan blade 2, and the extension part 3a-1. It has a boss part outer peripheral surface side extension part 3a-2 extending perpendicularly in the axial direction toward the leeward side along the boss part outer peripheral surface, and the boss part front surface side extension part 3a-1 is formed when the fan rotates. A shape in which the guide surface is smoothly curved from the front edge 2-1 near the base of the fan blade 2 toward the center of the boss so that the airflow flows from the center of the boss 1 toward the outer periphery. The end portion on the front surface 1-1 side of the boss portion of the guide vane 3a is located in the vicinity of the inner peripheral surface of the boss portion, and the end portion on the outer peripheral surface side of the boss portion is the leeward side end portion of the outer peripheral surface of the boss portion. Is located. And each guide vane 3a is provided so that the part of the boss | hub part outer peripheral surface side extension part 3a-2 may be located between the said fan blades 2. FIG. Moreover, 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, the axial fan having such a configuration has a boss front side extension 3a-1 formed by extending guide vanes 3a provided radially on the front boss 1-1 to the front edge near the root of the fan blade 2. And the boss portion outer peripheral surface side extension portion 3a-2 formed by extending the extension portion along the boss portion outer peripheral surface toward the leeward side at right angles to the axial direction, thereby rotating the fan. The air flowing along the front surface 1-1 of the boss portion is guided radially to the boss portion outer peripheral surface side by the presence of the guide vane 3a as indicated by the arrow A, and flows in the axial direction on the outer periphery of the boss portion. It is composed.
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たブレード付け根部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。２ａ−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をファンブレード２の付け根部付近の前縁まで延長して形成したボス部前面側延長部３ｂ−１と、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直角に延長して形成したボス部外周面側延長部３ｂ−２とで形成することにより、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。
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. An axial fan having substantially the same structure is illustrated. 2a-1 is a protrusion of the blade root.
Therefore, also in the axial fan of the second embodiment, the boss portion front side extension formed by extending the guide vanes 3b provided radially on the boss portion front surface 1-1 to the front edge near the base portion of the fan blade 2 is formed. By forming the extension portion 3b-1 and the boss portion outer peripheral surface side extension portion 3b-2 formed by extending the extension portion along the outer peripheral surface of the boss portion toward the leeward side at a right angle in the axial direction. 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 by the presence of the guide vane 3b as indicated by the arrow B, and the outer periphery of the boss portion is axially directed. Flowing into.
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２ａ−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１−１に放射状に設けるガイドベーン３ｃをファンブレード２の付け根部付近の前縁まで延長して形成したボス部前面側延長部３ｃ−１と、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直角に延長して形成したボス部外周面側延長部３ｃ−２とで形成することにより、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。
In the axial fan of the third embodiment shown in FIG. 3, the protruding portion 2a of the blade root portion 2c in which the boss portion front 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 fan of the third embodiment, the boss portion front side extension formed by extending the guide vanes 3c provided radially on the boss portion front surface 1-1 to the front edge near the base portion of the fan blade 2 is formed. By forming the portion 3c-1 and the boss portion outer peripheral surface side extension portion 3c-2 formed by extending the extension portion along the boss portion outer peripheral surface toward the leeward side at a right angle in the axial direction. As with the axial fan of the second embodiment, the air flowing along the front surface 1-1 of the boss portion when the fan rotates moves to the outer peripheral surface side of the boss portion due to the presence of the guide vane 3c as indicated by the arrow c. It is guided radially and flows in the axial direction on the outer periphery of the boss.
図４に示す第４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４実施例の軸流ファンのガイドベーン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滑らかに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。２ｄはブレード付け根部である。
したがって、この第４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３ｄをファンブレード２の付け根部付近の前縁まで延長して形成したボス部前面側延長部３ｄ−１と、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直角に延長して形成したボス部外周面側延長部３ｄ−２とで形成することにより、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。
The axial fan of the fourth embodiment shown in FIG. 4 has substantially the same structure as that of the first embodiment shown in FIG. 1 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 3d of the axial fan according to the fourth embodiment has a boss front surface extension 3d-1 extending from the front surface 1-1 of the boss to the front edge 2-1 near the root of the fan blade 2. The guide surface is smoothly 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. 2d is a blade root.
Therefore, also in the axial fan of the fourth embodiment, the boss portion front side extension formed by extending the guide vanes 3d provided radially on the boss portion front surface 1-1 to the front edge near the base portion of the fan blade 2 is formed. By forming the portion 3d-1 and the boss portion outer peripheral surface side extension portion 3d-2 formed by extending the extension portion along the boss portion outer peripheral surface toward the leeward side at a right angle in the axial direction. As with the axial fan of the first embodiment, the air flowing along the front surface 1-1 of the boss portion when the fan rotates moves toward the outer peripheral surface side of the boss portion due to the presence of the guide vane 3d as indicated by the arrow D. It is guided radially and flows in the axial direction on the outer periphery of the boss.
図５に示す第５実施例の軸流ファンは、ガイドベーンのボス部前面１−１側の湾曲形状を前記図４に示す軸流ファンのガイドベーン３ｄとほぼ同じ形状にガイド面の湾曲形状を変えた以外は、前記図２に示す第２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５実施例の軸流ファンのガイドベーン３ｅも、前記図４に示す軸流ファンのガイドベーン３ｄと同様に、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のボス部内周面側端部を周方向に向って回転方向前方へ曲率中心位置を変えて湾曲した形状となしたものである。２ｅはブレート付け根部である。
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をファンブレード２の付け根部付近の前縁まで延長して形成したボス部前面側延長部３ｅ−１と、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直角に延長して形成したボス部外周面側延長部３ｅ−２とで形成することにより、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。
The axial flow fan of the fifth embodiment shown in FIG. 5 has a curved shape of the guide surface so that the curved shape on the front surface 1-1 side of the boss portion of the guide vane is substantially the same as the guide vane 3d of the axial flow fan shown in FIG. Except for changing the above, an axial fan having substantially the same structure as that of the second embodiment shown in FIG. 2 is illustrated. That is, the guide vane 3e of the axial fan of the fifth embodiment is also located in the vicinity of the root of the fan blade 2 from the front surface 1-1 of the boss portion, like the guide vane 3d of the axial fan shown in FIG. The boss part inner peripheral surface side end part of the boss part front surface side extension part 3e-1 extending to the front edge 2-1 has a curved shape with the center of curvature being changed forward in the rotation direction toward the circumferential direction. 2e is a brat base.
Therefore, also in the axial flow fan of the fifth embodiment, the boss portion front side extension formed by extending the guide vanes 3e provided radially on the boss portion front surface 1-1 to the front edge near the base portion of the fan blade 2 is formed. By forming the part 3e-1 and the boss part outer peripheral surface side extension part 3e-2 formed by extending the extension part along the boss part outer peripheral surface toward the leeward side at a right angle in the axial direction. As with the axial flow fan of the first embodiment, the air flowing along the front surface 1-1 of the boss portion when the fan rotates moves toward the outer peripheral surface side of the boss portion due to the presence of the guide vane 3e as indicated by the arrow H. It is guided radially and flows in the axial direction on the outer periphery of the boss.
図６に示す第６実施例の軸流ファンは、ガイドベーンのボス部前面１−１側の湾曲形状を前記図４、図５に示す軸流ファンのガイドベーン３ｄ、３ｅとほぼ同じ形状に変えた以外は、前記図３に示す第３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５実施例の軸流ファンのガイドベーン３ｆも、前記図４、図５に示す軸流ファンのガイドベーン３ｄ、３ｅと同様に、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３ｆ−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滑らかに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。２ｆはブレート付け根部である。
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１−１に放射状に設けるガイドベーン３ｆをファンブレード２の付け根部付近の前縁まで延長して形成したボス部前面側延長部３ｆ−１と、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直角に延長して形成したボス部外周面側延長部３ｆ−２とで形成することにより、前記第３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前記ガイドベーン３ｆ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。
In the axial fan of the sixth embodiment shown in FIG. 6, the curved shape of the guide vane on the boss portion front surface 1-1 side is substantially the same as the guide vanes 3d and 3e of the axial fan shown in FIGS. Except for the change, an axial fan having substantially the same structure as that of the third embodiment shown in FIG. 3 is illustrated. That is, the guide vane 3f of the axial fan of the fifth embodiment is also similar to the guide vanes 3d and 3e of the axial fan shown in FIGS. 4 and 5 from the front surface 1-1 of the boss portion to the fan blade 2. The shape of the boss front side extension 3f-1 extending to the front edge 2-1 in the vicinity of the base portion of the boss is smoothly changed from a concave shape to a convex shape in the middle from the inner peripheral side to the outer peripheral surface side of the boss portion. It is changed to a curved shape. 2f is a brat base.
Therefore, also in the axial fan of the sixth embodiment, the boss portion front side extension formed by extending the guide vanes 3f provided radially on the boss portion front surface 1-1 to the front edge near the base portion of the fan blade 2 is formed. By forming the portion 3f-1 and the boss portion outer peripheral surface side extension portion 3f-2 formed by extending the extension portion along the boss portion outer peripheral surface toward the leeward side at a right angle in the axial direction. As with the axial fan of the third embodiment, the air flowing along the front surface 1-1 of the boss portion when the fan rotates moves toward the outer peripheral surface side of the boss portion due to the presence of the guide vane 3f as indicated by the arrow. It is guided radially and flows in the axial direction on the outer periphery of the boss.
なお、上記図１〜図６に示す軸流ファンでは、ガイドベーン３ａ〜３ｆのボス部外周面側延長部３ａ−２〜３ｆ−２を当該ボス部外周面の風下側端縁まで形成しているが、このガイドベーン３ａ〜３ｆのボス部外周面側延長部３ａ−２〜３ｆ−２の長さは、必ずしも当該ボス部外周面の風下側端縁までとする必要はなく、軸流ファンの大きさ、ボス部外周面の幅、ブレード付け根部の翼弦長さ等に応じて、ボス部外周面の幅より短く形成してもよいことはいうまでもない。 In the axial fan shown in FIGS. 1 to 6, the boss part outer peripheral surface side extension parts 3a-2 to 3f-2 of the guide vanes 3a to 3f are formed to the leeward side edge of the boss part outer peripheral surface. However, the length of the boss portion outer peripheral surface side extension portions 3a-2 to 3f-2 of the guide vanes 3a to 3f is not necessarily limited to the leeward side edge of the boss portion outer peripheral surface. Needless to say, the width of the outer peripheral surface of the boss may be shorter than the width of the outer peripheral surface of the boss, depending on the width of the outer peripheral surface of the boss, the chord length of the blade root, and the like.
図７に示す第７実施例の軸流ファンは、そのボス部外周面側延長部の長さを当該ボス部外周面の幅より短く形成したガイドベーンを有する軸流ファンを例示したもので、図１に示す第１実施例の軸流ファンに適用した例を示す。すなわち、この第７実施例の軸流ファンは、ガイドベーン３ｇ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３ｇ−１と、該延長部３ｇ−１から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直角に延びて当該ボス部外周面の幅より短く形成したボス部外周面側延長部３ｇ−２とで構成したものである。
したがって、かかる構成の軸流ファンの場合でも、前記ボス部前面１−１に放射状に設けるガイドベーン３ｇをファンブレード２の付け根部付近の前縁まで延長して形成したボス部前面側延長部３ｇ−１と、ボス部外周面の幅より短く形成したボス部外周面側延長部３ｇ−２の存在により、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ため、その作用効果は前記した実施例１のものとほとんど変わらないことはいうまでもない。
なお、ここでは一例として実施例１の軸流ファンに適用した場合を示したが、他の実施例に適用しても同様の作用効果が得られることはいうまでもない。また、ここでは断面コ字状のボスに適用した例を示したが、断面台形状でコーン状のボスに適用してガイドベーンを非直角に設けてもよいことはいうまでもない。
The axial fan of the seventh embodiment shown in FIG. 7 is an example of an axial fan having a guide vane in which the length of the boss portion outer peripheral surface side extension is shorter than the width of the boss portion outer peripheral surface. The example applied to the axial-flow fan of 1st Example shown in FIG. That is, in the axial fan of the seventh embodiment, the guide vane 3g 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, and the boss front surface side extension 3g-1. And the boss part outer peripheral surface side extension part 3g-, which extends from the extension part 3g-1 to the leeward side along the boss part outer peripheral surface at a right angle in the axial direction and is shorter than the width of the boss part outer peripheral surface. 2 and.
Therefore, even in the case of such an axial fan, the boss front side extension 3g formed by extending the guide vanes 3g provided radially on the boss front 1-1 to the front edge near the base of the fan blade 2 is formed. -1 and the boss portion outer peripheral surface side extension 3g-2 formed shorter than the width of the boss portion outer peripheral surface, the air flowing along the boss portion front surface 1-1 when the fan rotates is indicated by an arrow G. Thus, since it is guided radially to the outer peripheral surface side of the boss part and flows in the axial direction on the outer periphery of the boss part, it goes without saying that the operation and effect are almost the same as those of the first embodiment.
In addition, although the case where it applied to the axial-flow fan of Example 1 was shown as an example here, it cannot be overemphasized that the same effect is acquired even if it applies to another Example. Although an example in which the boss having a U-shaped cross section is shown here, it goes without saying that the guide vanes may be provided at non-right angles by applying to a cone-shaped boss having a trapezoidal cross section.
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〜３ｇをボス部１と一体に設けるか、あるいはガイドベーン３ａ〜３ｇ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 3g 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 3g 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１．２〜３．５％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 1 The result which improved about 2-3.5% 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前縁まで延長し、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直角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と共に、ボス部に設ける前記ガイドベーンにより当該ボス部が補強されるので、ボス部の強度の向上にも有効である等、品質的に優れた軸流ファンを実現でき、また、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。 The present invention has a structure in which guide vanes provided radially on the front surface of the boss part are extended to the front edge of the fan blade, and the extension part is further formed perpendicular to the axial direction toward the leeward side along the outer peripheral surface of the boss part. As a result, a radial flow is generated on the front surface of the boss portion in front of the fan, and 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 flow component, and the air flowing along the front surface of the boss portion. Can be smoothly and radially guided to the outer peripheral surface side of the boss portion, so that the wrap around the rear surface of the boss portion is also improved, and a high air volume can be obtained while suppressing the horsepower consumption, and the guide vane provided in the boss portion Since the boss part is reinforced by this, an axial fan with excellent quality can be realized, such as being effective in improving the strength of the boss part, and it can be rotated for cooling an automobile engine or the like. Not an axial flow engine cooling fan only, it is also applicable to the cooling fan of various power engine.
１ ボス部
１−１ ボス部前面
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〜２ｇ ブレード付け根部
３ａ〜３ｇ ガイドベーン
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 2 Fan blade 2-1 Blade front edge 2-2 Blade rear edge 2a-2g Blade root part 3a-3g Guide vane 4 Attachment member (insert) to mating member
Claims (4)
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| JP2007175678A JP4925946B2 (en) | 2007-07-03 | 2007-07-03 | Axial fan |
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| JP2007175678A JP4925946B2 (en) | 2007-07-03 | 2007-07-03 | Axial fan |
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| JP4925946B2 true JP4925946B2 (en) | 2012-05-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS603299U (en) * | 1983-06-21 | 1985-01-11 | 臼井国際産業株式会社 | engine cooling fan |
| JPS6073000A (en) * | 1983-09-29 | 1985-04-25 | コルゲ−ト・パ−モリブ・カンパニ− | Rod form detergent and continuous extrusion |
| JPH03130412U (en) * | 1990-04-12 | 1991-12-27 | ||
| JP4120228B2 (en) * | 2001-02-07 | 2008-07-16 | 株式会社デンソー | Axial flow fan for vehicles |
| JP2003214389A (en) * | 2002-01-21 | 2003-07-30 | Nippon Densan Corp | Impeller for fan |
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