JP4476960B2

JP4476960B2 - Axial fan

Info

Publication number: JP4476960B2
Application number: JP2006102651A
Authority: JP
Inventors: 幸介佐藤; 純一池田
Original assignee: Nidec Servo Corp
Current assignee: Nidec Servo Corp
Priority date: 2006-04-04
Filing date: 2006-04-04
Publication date: 2010-06-09
Anticipated expiration: 2026-04-04
Also published as: JP2007278104A

Description

本発明は軸流ファン、特に高効率化を意図する軸流ファンの改良に関する。 The present invention relates to an axial fan, and more particularly to an improvement of an axial fan intended to increase efficiency.

特開２００４−３３２６７４号公報JP 2004-332673 A 特開２００４−３５３５８５号公報JP 2004-353585 A

軸流ファンの送風効率改善に係る提案は多岐に亘り、夫々実用に供され相応の効果を実現している。 There are various proposals for improving the ventilation efficiency of the axial fan, and each of them has been put into practical use and has achieved a corresponding effect.

詳細は夫々の公報に譲り省略するが、上述特許文献は、いずれも軸流ファンにおける改善の例で、プロペラファン形状や通風路を形成する風洞の形状に係るもので、送風効率向上手段として種々提案され改善の実を上げていることに疑問の余地の無いことは上述の通りである。 Although the details are omitted in the respective publications, the above-mentioned patent documents are all examples of improvements in the axial fan, and relate to the shape of the propeller fan and the shape of the wind tunnel that forms the ventilation path. As mentioned above, there is no doubt that it has been proposed and improved.

しかし、静音化を含む性能向上、効率向上のニーズが留まるものでないことも事実で、更なる改良が求められていることに変わりは無い。 However, it is also true that the need for improved performance and efficiency, including noise reduction, does not remain, and there is still a need for further improvements.

上述のような従来技術に成る軸流ファンの解決すべき課題は、やむことの無い静音化・効率向上のニーズに対応する静音化・効率向上の実現である The problem to be solved by the axial fan according to the prior art as described above is the realization of noise reduction / efficiency improvement that meets the need for noise reduction / efficiency improvement unavoidably

本発明に成る軸流ファンは、
ベンチュリーケース１とプロペラ２を有し、モータ３及び該モータ３で駆動される前記プロペラ２を回転自在に保持するためベンチュリケース１と一体を成す脚として形成されている静翼１−１の、プロペラ２の動翼圧力面に対向する受風面１−１１が、内周側と外周側の中間部位に屈曲点１−１４を介して連通するように形成され、好ましくは、 The axial fan according to the present invention is
A stationary blade 1-1 having a venturi case 1 and a propeller 2 and formed as a leg integral with the venturi case 1 for rotatably holding the motor 3 and the propeller 2 driven by the motor 3; A wind receiving surface 1-11 facing the rotor blade pressure surface of the propeller 2 is formed so as to communicate with an intermediate portion between the inner peripheral side and the outer peripheral side via a bending point 1-14.

前記静翼受風面１−１１が、内周側の放射方向に展伸する面１−１３から、外周側の円周方向に展伸する面１−１２として連通するように形成され、また、 The stationary blade receiving surface 1-11 is formed so as to communicate from a surface 1-13 extending in the radial direction on the inner peripheral side to a surface 1-12 extending in the circumferential direction on the outer peripheral side, and ,

前記プロペラ２の、外周円弧径と内周円弧径との径差で見る軸方向投影による幅をＨとしたとき、静翼受風面の屈曲点が、内周側から（０．７〜０．８）Ｈの位置となるように形成され、また、 When the width of the propeller 2 by axial projection viewed from the difference between the outer peripheral arc diameter and the inner peripheral arc diameter is H, the bending point of the stationary blade receiving surface is (0.7 to 0) from the inner peripheral side. .8) formed to be in the position of H, and

前記静翼受風面１−１１は、内周側展伸面１−１３の軸方向投影による放射角と成す平均偏倚角をθとしたとき、外周側展伸面１−１２の同放射角と成す平均偏倚角が２θより大となるように形成される。 The stationary blade receiving surface 1-11 has the same radiation angle of the outer circumferential surface 1-12, where θ is the average deflection angle formed by the axial projection of the inner circumferential surface 1-13. Is formed so that the average declination angle is greater than 2θ.

本発明に成る軸流ファンは、静音化・効率向上の更なる向上に貢献する。 The axial fan according to the present invention contributes to further improvement in noise reduction and efficiency improvement.

以下図面により本発明の実施例を説明する。 Embodiments of the present invention will be described below with reference to the drawings.

図１は、本願発明に成る軸流ファン０での静翼１−１の例の部分拡大説明図で、図２に示す従来技術軸流ファン０での静翼１−１の例の部分拡大説明図と比較すると判るように、図２に見る、周知の従来技術に成る静翼１−１の受風面１−１１が、内周側から外周側になだらかな円弧状を示す構成であるのに対し、本願発明に成る静翼の受講面１−１は、内周側で放射方向に展伸し、外周側に至る中間部位で円周方向に展伸するように屈曲する形状として形成される。 FIG. 1 is a partially enlarged explanatory view of an example of a stationary blade 1-1 in an axial fan 0 according to the present invention. FIG. 1 is a partially enlarged view of an example of a stationary blade 1-1 in the prior art axial fan 0 shown in FIG. As can be seen from comparison with the explanatory diagram, the wind receiving surface 1-11 of the stationary vane 1-1 according to the well-known prior art shown in FIG. 2 is configured to have a gentle arc shape from the inner peripheral side to the outer peripheral side. On the other hand, the attending surface 1-1 of the stationary blade according to the present invention is formed as a shape that expands in the radial direction on the inner peripheral side and bends so as to expand in the circumferential direction at the intermediate portion reaching the outer peripheral side. Is done.

図３を参照して、回転駆動によるプロペラ２の正面から見た時の速度分布は、円周方向成分（Ｖθ）、遠心方向成分（Ｖｒ）、その合成（Ｖ）として表わすことが出来る。このことは、外周側に行くにつれ、特に高速回転では遠心方向成分（Ｖｒ）が大きくなることを意味し、図２でプロペラの径方向各部位にＶとして表示しているように、実際の速度分布は外周側に近付くほど放射方向に開いて行くことになる。 With reference to FIG. 3, the speed distribution when viewed from the front of propeller 2 by rotational drive can be expressed as a circumferential component (Vθ), a centrifugal component (Vr), and a combination (V) thereof. This means that the centrifugal direction component (Vr) becomes larger as it goes to the outer circumference side, especially at high speed rotation. As shown in FIG. The distribution becomes wider in the radial direction as it approaches the outer periphery.

従って、図２に見る従来技術に成る円弧状受風面１−１１の形状では、静翼１−１が外周側の通風を受け止められず、軸方向へ垂直に十分整流することが出来ず、遠心方向への漏れを生じる現象を確実に回避出来ないものであった。 Therefore, in the shape of the arcuate wind receiving surface 1-11 according to the prior art shown in FIG. 2, the stationary blade 1-1 cannot receive the ventilation on the outer peripheral side, and cannot sufficiently rectify vertically in the axial direction. The phenomenon of causing leakage in the centrifugal direction could not be avoided reliably.

本願発明は、上述遠心方向への漏れを解消すべく、図１に見るように、外周側での遠心方向への風の流れを阻止し、風の流れを外周側から内周側へ巻き込む様にプロペラ受風面１−１１の全面で軸方向へ垂直に整流可能とするように、外周側を円周方向に展伸させるものである。 In the present invention, in order to eliminate the leakage in the centrifugal direction, as shown in FIG. 1, the flow of the wind in the centrifugal direction on the outer peripheral side is blocked and the wind flow is wound from the outer peripheral side to the inner peripheral side. Further, the outer peripheral side is expanded in the circumferential direction so that the entire propeller wind receiving surface 1-11 can be straightened in the axial direction.

そして、上述する、内周側で放射方向に展伸し外周側で円周方向に展伸する静翼受風面中間部位の屈曲点１−１４は、種々検討の結果、プロペラ２の、外周円弧径と内周円弧径との径差で見る軸方向投影による幅をＨとしたとき、内周側から（０．７〜０．８）Ｈの位置とすることが最適であることを確認している。 And the bending point 1-14 of the stationary blade wind-receiving surface intermediate part which expands in the radial direction on the inner peripheral side and expands in the circumferential direction on the outer peripheral side is the outer periphery of the propeller 2 as a result of various studies. Confirmed that the position of (0.7 to 0.8) H from the inner circumference side is optimal when the width of the axial projection viewed from the difference between the arc diameter and the inner circumference arc diameter is H. is doing.

本願発明の骨子である上述受風面１−１の屈曲形成の効果は、図４に例示するように、騒音レベルを維持しつつ、風量特性の中間部位の落ち込み点で、２０％を超える性能改善を実現している。
As shown in FIG. 4, the effect of bending formation of the wind receiving surface 1-1, which is the gist of the present invention, is a performance exceeding 20% at the drop point of the intermediate portion of the air flow characteristic while maintaining the noise level. Improvement has been realized.

また、静翼受風面１−１１は、内周側展伸面の軸方向投影による放射角と成す平均偏倚角に対し、外周側展伸面の同放射角と成す平均偏倚角を２倍以上とするように形成することが効果的であることも確認されている。 In addition, the stationary blade wind receiving surface 1-11 has twice the average deflection angle formed with the same radiation angle of the outer peripheral side expanded surface with respect to the average deflection angle formed with the axial projection of the inner peripheral extended surface. It has also been confirmed that the formation as described above is effective.

本発明に成る軸流ファンは、止むことの無い静音化・効率向上のニーズに対応し、より広い用途に利用可能となる。 The axial fan according to the present invention can be used for a wider range of applications in response to the need for silent and efficient improvement without stopping.

本願発明に成る軸流ファンでの静翼の例の部分拡大説明図である。It is a partial expanded explanatory view of the example of the stationary blade in the axial-flow fan which concerns on this invention. 従来技術に成る軸流ファンでの静翼の例の部分拡大説明図である。It is the elements on larger scale of the example of the stationary blade in the axial fan used as a prior art. 本願発明に係るブレード上面における速度分布の説明図である。It is explanatory drawing of the velocity distribution in the blade upper surface which concerns on this invention. 基本構成を同じくする本願発明と従来技術の例での特性比較図である。It is a characteristic comparison figure in the example of this invention and the prior art which has the same basic composition. 本願発明に係る軸流ファンを説明する断面図である。It is sectional drawing explaining the axial-flow fan which concerns on this invention.

符号の説明Explanation of symbols

０軸流ファン
１ベンチュリーケース
１−１静翼（脚）
１−１１受風面
１−１２外周側受風面
１−１３内周側受風面
１−１４変曲点
１−２吸込口
２プロペラ
２−１ブレード
３モータ 0 Axial fan 1 Venturi case 1-1 Stator blade (leg)
1-11 Wind receiving surface 1-12 Outer circumferential side wind receiving surface 1-13 Inner circumferential wind receiving surface 1-14 Inflection point 1-2 Suction port 2 Propeller 2-1 Blade 3 Motor

Claims

ベンチュリーケースと、該ベンチュリーケースに内装されるプロペラと、該プロペラを回転駆動するモータと、該モータ及び前記プロペラをベンチュリーケースの中央部に保持するために該ベンチュリーケースに一体に設けられたほぼ放射状の複数の脚とを備え、該各脚は前記プロペラの回転により発生する空気流を受ける受風面が形成されて静翼となる軸流ファンにおいて、前記プロペラの動翼圧力面に対向する前記脚の受風面が、放射方向線に対し前記プロペラの回転方向とは反対方向に傾斜すると共に、前記脚の受風面の内周側がほぼ放射方向に展伸する面を有し、外周側が円周方向に展伸する面を有し、該受風面の内周側と外周側の中間部位に、外周側が内周側に対して前記プロペラの回転方向とは逆方向に折れ曲がるように屈曲点が形成されていることを特徴とする軸流ファン。 A venturi case, a propeller housed in the venturi case, a motor for rotationally driving the propeller, and a substantially radial shape integrally provided in the venturi case to hold the motor and the propeller at a central portion of the venturi case A plurality of legs, each of which has a wind receiving surface for receiving an air flow generated by the rotation of the propeller, and is a stationary blade, and is opposed to the blade pressure surface of the propeller. The wind receiving surface of the leg is inclined in a direction opposite to the rotation direction of the propeller with respect to the radial direction line, and the inner peripheral side of the wind receiving surface of the leg has a surface extending substantially in the radial direction. It has a surface that extends in the circumferential direction, and is bent at an intermediate portion between the inner peripheral side and the outer peripheral side of the wind receiving surface so that the outer peripheral side bends in a direction opposite to the rotation direction of the propeller with respect to the inner peripheral side. point Axial fan, characterized by being formed.

前記プロペラの外周円弧径と内周円弧径との径差で見る軸方向投影による幅をＨとしたとき、前記脚の受風面における前記屈曲点が、内周側から（０．７〜０．８）Ｈの位置となるように形成されていることを特徴とする請求項１に記載の軸流ファン。 When the width by axial projection viewed from the difference between the outer peripheral arc diameter and the inner peripheral arc diameter of the propeller is H, the bending point on the wind receiving surface of the leg is (0.7 to 0) from the inner peripheral side. .8) The axial fan according to claim 1 , wherein the axial fan is formed so as to be in a position of H.

前記脚の受風面は、内周側展伸面の軸方向投影による放射方向線と成す平均偏倚角をθとしたとき、外周側展伸面の同放射方向線と成す平均偏倚角が２θより大となるように形成されていることを特徴とする請求項１に記載の軸流ファン。 The wind receiving surface of the leg has an average deflection angle formed with the radial direction line of the outer circumferential side extended surface of 2θ, where θ is the average deflection angle formed with the radial direction line by axial projection of the inner circumferential side extended surface. The axial fan according to claim 1 , wherein the axial fan is formed to be larger.