JP4233359B2 - Blower impeller for air conditioner - Google Patents

Blower impeller for air conditioner Download PDF

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Publication number
JP4233359B2
JP4233359B2 JP2003060736A JP2003060736A JP4233359B2 JP 4233359 B2 JP4233359 B2 JP 4233359B2 JP 2003060736 A JP2003060736 A JP 2003060736A JP 2003060736 A JP2003060736 A JP 2003060736A JP 4233359 B2 JP4233359 B2 JP 4233359B2
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blade
maximum
line
air conditioner
height
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JP2004003447A (en
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善樹 泉
孝 杉尾
喜章 後藤
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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【０００１】
【発明の属する技術分野】
本発明は、空気調和機の送風機に用いられる斜流羽根を備えた送風機羽根車に関するもので、特に、同羽根車の羽根の断面形状に関する。
【０００２】
【従来の技術】
特許文献１にあるように従来の軸流送風機は、第８および９図に示すような構成になっていた。すなわち、円筒状のハブ１２に複数枚の厚翼の翼型をした羽根１１を放射状に設けて軸流送風機羽根車１０を構成していた。
【０００３】
軸流送風機羽根車１０を円筒座標Ｂで切断して展開した厚翼の翼型をした羽根は、第９図の羽根１３のような形状をしていた。すなわち、反り線１４の最大反り高さの位置は前縁から弦長の４０％から５０％の位置にしていた。また、その反り線１４を２つの２次曲線にて構成していた。また、翼型の最大厚みを、前縁から弦長の３０％から４０％の位置にするというものである。
【０００４】
この軸流送風機１０を適当なケ−シングに納めて回転させることにより送風作用を生じるようにしていた。
また斜流送風機の羽根車については例えば特許文献２に開示されているものがある。通常の斜流羽根車の構成と異なり、剥離点をより後縁寄りにずらすため、反り線の最大反り高さの位置が前縁と後縁の中央よりも後縁側に寄った反り形状に構成されたものである。
【０００５】
【特許文献１】
特開２００１−２３４８９３号公報
【０００６】
【特許文献２】
特開平１−９６４９９号公報
【０００７】
【発明が解決しようとする課題】
しかしながら、上記従来の軸流送風機の構成では、羽根１１の反り線１４の最大反り高さの位置と、厚翼の翼型の最大厚みの位置を規定しただけである。これでは、反り線を円弧翼として最大反り高さの位置のみをずらしたものであり、且つ、羽根の半径方向の分布に関しては、何の記載もないものである。また、羽根１３の翼型の最大厚み位置を規定したに過ぎない。
【０００８】
そもそも、反り線は送風機の空力性能を規定する重要な要因である。最大反り高さの位置を前縁から弦長の４０％から５０％にしただけで、羽根の半径方向への分布を規定していなければ、充分な空力性能の向上、即ち、ファン効率の向上は望めない。
【０００９】
羽根１３の翼型の最大厚み位置は、送風機の騒音性能に影響を与える要因である。この位置を前縁から弦長の３０％から４０％位置にすると言うことは、ＮＡＣＡの翼列デ−タにも開示されていることであり、低騒音への効果も薄いものであることが、既知の事柄として我々の実験より判明している。
【００１０】
また上記従来の斜流送風機の構成においても、前縁から後縁までの翼断面についての形状特徴のみの開示であり、羽根の半径方向への分布については一切記載されていない。
【００１１】
【課題を解決するための手段】
上記目的を達成するために本発明は、略円錐台状のハブに複数枚の羽根を設けてなる斜流送風機羽根車型の空気調和機用送風機羽根車において、前記羽根の外周側弦長が前記羽根のハブ側弦長より長くて、前記ハブの中心線上に頂点を有して中心線を回転軸とする円錐で前記羽根を切断して展開した円錐座標で前記羽根の断面形状を示した場合において、前記羽根断面における反り線の最大反り高さが前記羽根断面に対応する円弧翼の最大反り高さより低く、且つ、前記羽根の半径方向に渡って、反り線の最大反り高さと円弧翼の最大反り高さとの比が一定である空気調和機用送風機羽根車を提供するものである。
【００１２】
上記構成によって、セパレ−ト型空気調和機の室外機で定常運転されている時の斜流送風機羽根車に対する、流入空気の状態は定常状態で一定である。そこで、円弧翼の場合より反り高さが低いので、流入空気に対して反り線が円弧翼の場合より流線型の度合いが強まる。このことによって、羽根への抗力が低くなり、ファン効率が向上する。この効果が、羽根の半径方向に渡って成立する。
【００１３】
【発明の実施の形態】
請求項１に記載の発明は、略円錐台状のハブに複数枚の羽根を設けてなる斜流送風機羽根車型の空気調和機用送風機羽根車において、前記羽根の外周側弦長が前記羽根のハブ側弦長より長くて、前記ハブの中心線上に頂点を有して中心線を回転軸とする円錐で前記羽根を切断して展開した円錐座標で前記羽根の断面形状を示した場合において、前記羽根断面における反り線の最大反り高さが前記羽根断面に対応する円弧翼の最大反り高さより低く、且つ、前記羽根の半径方向に渡って、反り線の最大反り高さと円弧翼の最大反り高さとの比が一定である空気調和機用送風機羽根車を提供するものである。なおここでいう前記羽根断面に対応する円弧翼とは、専門家にはよく知られているように、前記円錐座標における羽根断面において、前縁点と前縁における入口角と後縁における出口角とを与えて決定される単一円弧翼のことを意味する。
【００１４】
そして、この構成によれば、セパレ−ト型空気調和機の室外機で定常運転されている時の斜流送風機羽根車に対する、流入空気の状態は定常状態で一定である。そこで、円弧翼の場合より反り高さが低いので、流入空気に対して反り線が円弧翼の場合より流線型の度合いが強まる。このことによって、羽根への抗力が低くなり、ファン効率（静圧効率）が向上する。この効果が、羽根の半径方向に渡って成立する。
【００１５】
請求項２に記載の発明は、反り線の最大反り高さの位置が、前記羽根の半径方向に渡って、すべて、円弧翼の場合より、すなわち弦長の中央点より前縁寄りに存在する空気調和機用送風機羽根車を提供するものである。そして、この構成により次の効果を奏する。一般に、羽根は前縁から最大反り高さ位置までで徐々に圧力が低下し、最大反り高さ位置を過ぎた部分から逆に圧力が上昇する。そこで、騒音よりファン効率（静圧効率）の観点から、羽根のどの半径方向によっても、この構成なので、羽根での昇圧部分の弦長と範囲を大きくとることができる。これにより、空気調和機用送風機羽根車の仕事としての回転数当たりのヘッドを大きくできるので、結果的にファン効率が向上することになる。
【００１６】
請求項３に記載の発明は、反り線に厚翼の翼型を重畳して、その最大厚みｔと弦長Ｃとの比ｔ／Ｃが、５％から１２％の範囲となるように前縁側が尖った翼型の羽根形状とし、且つ、最大厚みが前記羽根の半径方向に渡って一定である或いは外周に向かうにしたがって厚みが減少する空気調和機用送風機羽根車を提供するものである。そして、この構成によって、厚さが一定の薄翼に比較して、厚翼の翼型形状をした羽根により、流れの剥離が防止されて、低騒音効果を発揮する事ができて、ファン効率の向上と両立できることになる。さらに、翼型の最大厚みが半径方向に渡って一定か、もしくは、外周よりほど細くなるので、回転時の強度に対しても安全性が高い。
【００１７】
【実施例】
以下に、本発明の一実施例の斜流送風機羽根車について、図面を参照して説明する。
【００１８】
（実施例1）
本発明の第１の実施例を図１から図４を用いて説明する。
図１は空調用の斜流送風機羽根車の斜視図、図２は、同羽根車の平面図、図３は同羽根車の子午面、図４は同羽根車を図３のＯ1−Ａの円錐で切断して展開した円錐座標上の反り線の図である。
【００１９】
図に示すように、略円錐台状のハブ３に複数枚の薄翼の羽根２を設けてなる斜流送風機羽根車１において、羽根２の外周側弦長が羽根２のハブ側弦長より長くて、ハブ３の中心線Ｏ１−Ｏ２上に頂点を有して中心線Ｏ １ −Ｏ ２ を回転軸とする円錐Ｏ１−Ａで羽根２を切断して展開した円錐座標７で羽根２の断面形状を示した場合において、反り線６の最大反り高さｈが円弧翼の最大反り高さより低く、且つ、羽根２の半径方向に渡って、反り線６の最大反り高さと円弧翼の最大反り高さとの比ｒが一定である。
【００２０】
なお従来の円弧翼およびこの円弧翼の最大反り高さを確認のために図１０を使用して次に定義する。一般に翼弦長Ｌが決まり、前縁における反り線の接線と前縁の回転軌跡線の接線との間に形成される入口角αと、後縁における反り線の接線と後縁の回転軌跡線の接線との間に形成される出口角βとが求まると、円弧翼は一義的に定義される。そして円弧翼の最大反り高さｈ１とは、翼弦長Ｌの５０％位置における反り線の高さである。
【００２１】
斜流送風機羽根車１のハブ３にモ−タシャフトを固定して、適切なケ−シングに納め、モ−タにより回転させることで送風作用を生じることは、勿論である。このとき、空気の殆どは、羽根２の前縁４より流入し、後縁５より流出して、空力仕事を行う。
【００２２】
そして、上記構成によって、セパレ−ト型空気調和機の室外機で定常運転されている時の斜流送風機羽根車１に対する、流入空気の状態は定常状態で一定である。そこで、円弧翼の場合より反り高さが低いので、流入空気に対して反り線６が円弧翼の場合より流線型の度合いが強まる。このことによって、羽根への抗力が低くなり、ファン効率が向上する。この効果が、羽根の半径方向に渡って成立する。
【００２３】
外径Φ４１５の薄翼の斜流送風機をセパレ−ト型空気調和機の室外機で、実験したところ、反り線が円弧翼の場合に比較して、ｒ＝最大反り高さ／円弧翼の最大反り高さ＝０．６の反り線を用いた斜流送風機羽根車１は、効率比で６％優れ、同一風量当たりの回転数比は、約５％増加する。しかし、騒音は、０．４ｄＢ増加することが判明している。
【００２４】
また、この構成と効果は空調用の軸流送風機においても成立する。
（実施例２）
本発明の第２の実施例を図５を用いて説明する。
【００２５】
図５は、同羽根車を図２のＯ１−Ａの円錐で切断して展開した円錐座標上の反り線の図である。
図に示すように、ハブ３の中心線Ｏ １ −Ｏ ２ 上に頂点を有して中心線Ｏ １ −Ｏ ２ を回転軸とする円錐Ｏ １ −Ａで羽根２を切断して展開した円錐座標７で羽根２の断面形状を示した場合において、反り線６の最大反り高さの位置Ｌが、羽根２の半径方向に渡って、すべて、円弧翼の場合より前縁寄りに存在する。即ち、Ｌ／Ｃ＜０．５である。ただし、Ｃは羽根の弦長である。
【００２６】
そして、上記構成によって、次の効果を奏する。一般に、羽根２は前縁４から最大反り高さ位置までで徐々に圧力が低下し、最大反り高さ位置を過ぎた部分から逆に圧力が上昇する。そこで、騒音よりファン効率の観点から、羽根２のどの半径方向によっても、この構成なので、羽根での昇圧部分の弦長と範囲を大きくとることができる。これにより、空気調和機用送風機の斜流送風機羽根車１の仕事としての回転数当たりのヘッドを大きくできるので、結果的にファン効率が向上することになる。
【００２７】
外径Φ４１５の薄翼の斜流送風機をセパレ−ト型空気調和機の室外機で、実験したところ、反り線が円弧翼の場合に比較して、Ｌ／Ｃ＝０．３の反り線を用いた斜流送風機羽根車１は、効率比で3％優れ、同一風量当たりの回転数比は、約３％増加する。しかし、騒音は、０．４ｄＢ増加する事が、判明している。
【００２８】
また、この構成と効果は空調用の軸流送風機においても成立する。
（実施例３）
本発明の第３の実施例を図６および７を用いて説明する。
【００２９】
図６は、同羽根車を図３のＯ1−Ａの円錐で切断して展開した円錐座標上の反り線の図である。図７は、翼型の最大厚みｔと弦長Ｃの比と、騒音低減効果を記した、外径Φ４１５の斜流送風機羽根車１をセパレ−ト型空気調和機の室外機で実験した時の、デ−タである。
【００３０】
図に示すように、ハブ３の中心線Ｏ１−Ｏ２上に頂点を有して中心線Ｏ １ −Ｏ ２ を回転軸とする円錐Ｏ１−Ａで羽根２を切断して展開した円錐座標７で羽根２の断面形状を示した場合において、反り線６に厚翼の翼型８を重畳して、その最大厚みｔと弦長Ｃとの比ｔ／Ｃが、５％から１２％の範囲となるように前縁４側が尖った翼型８の羽根形状とし、且つ、最大厚みが羽根２の半径方向に渡って一定である或いは外周に向かうにしたがって厚みが減少する。
【００３１】
そして、この構成によって、厚さが一定の薄翼に比較して、厚翼の翼型形状をした羽根により、流れの剥離が防止されて、低騒音効果を発揮する事ができて、ファン効率の向上と両立できることになる。図７より、ｔ／Ｃが５％から低騒音効果を発揮し始め、約１２％でその効果が飽和しているのが判る。
【００３２】
さらに、翼型８の最大厚みｔが半径方向に渡って一定か、もしくは、外周よりほど細くなるので、回転時の強度に対しても安全性が高い。
また、この構成と効果は空調用の軸流送風機においても成立する。
【００３３】
【発明の効果】
上記実施例から明らかなように、請求項１に記載の発明は、略円錐台状のハブに複数枚の羽根を設けてなる斜流送風機羽根車型の空気調和機用送風機羽根車において、前記羽根の外周側弦長が前記羽根のハブ側弦長より長くて、前記ハブの中心線上に頂点を有して中心線を回転軸とする円錐で前記羽根を切断して展開した円錐座標で前記羽根の断面形状を示した場合において、前記羽根断面における反り線の最大反り高さが前記羽根断面に対応する円弧翼の最大反り高さより低く、且つ、前記羽根の半径方向に渡って、反り線の最大反り高さと円弧翼の最大反り高さとの比が一定である空気調和機用送風機羽根車を提供するものである。そして、この構成によれば、セパレート型空気調和機の室外機で定常運転されている時の斜流送風機羽根車に対する、流入空気の状態は定常状態で一定である。そこで、円弧翼より反り高さが低いので、流入空気に対して反り線が円弧翼より流線型の度合いが強まる。このことによって、羽根への抗力が低くなり、ファン効率が向上する。この効果が、羽根の半径方向に渡って成立する。
【００３４】
請求項２に記載の発明は、反り線の最大反り高さの位置が、前記羽根の半径方向に渡って、すべて、円弧翼の場合より前縁寄りに存在する空気調和機用送風機羽根車を提供するものである。そして、この構成により次の効果を奏する。一般に、羽根は前縁から最大反り高さ位置までで徐々に圧力が低下し、最大反り高さ位置を過ぎた部分から逆に圧力が上昇する。そこで、騒音よりファン効率の観点から、羽根のどの半径方向によっても、この構成なので、羽根での昇圧部分の弦長と範囲を大きくとることができる。これにより、空気調和機用送風機羽根車の仕事としての回転数当たりのヘッドを大きくできるので、結果的にファン効率が向上することになる。
【００３５】
請求項３に記載の発明は、反り線に厚翼の翼型を重畳して、その最大厚みｔと弦長Ｃとの比ｔ／Ｃが、５％から１２％の範囲となるように前縁側が尖った翼型の羽根形状とし、且つ、最大厚みが前記羽根の半径方向に渡って一定である或いは外周に向かうにしたがって厚みが減少する空気調和機用送風機羽根車を提供するものである。そして、この構成によって、厚さが一定の薄翼に比較して、厚翼の翼型形状をした羽根により、流れの剥離が防止されて、低騒音効果を発揮する事ができて、ファン効率の向上と両立できることになる。さらに、翼型の最大厚みが半径方向に渡って一定か、もしくは、外周よりほど細くなるので、回転時の強度に対しても安全性が高い。
【図面の簡単な説明】
【図１】本発明の第１の実施例の斜流送風機羽根車の斜視図。
【図２】本発明の第１の実施例の斜流送風機羽根車の平面図。
【図３】本発明の第１の実施例の斜流送風機羽根車の子午面。
【図４】本発明の第１の実施例の斜流送風機羽根車を図３のＯ1−Ａの円錐で切断して展開した円錐座標上の反り線の図。
【図５】本発明の第２の実施例の斜流送風機羽根車を図３のＯ1−Ａの円錐で切断して展開した円錐座標上の反り線の図。
【図６】本発明の第３の実施例の斜流送風機羽根車を図３のＯ1−Ａの円錐で切断して展開した円錐座標上の反り線の図。
【図７】本発明の第３の実施例の斜流送風機羽根車の羽根に用いた翼型の最大厚みｔと弦長Ｃの比と、騒音低減効果を記した、外径Φ４１５の羽根車のセパレ−ト型空気調和機の室外機における実験デ−タ。
【図８】従来の軸流送風機羽根車の平面図。
【図９】従来の軸流送風機羽根車の子午面。
【図１０】従来の円弧翼の斜流送風機羽根車において図６に対応する反り線の図。
【符号の説明】
１ 斜流送風機羽根車
２ 羽根
３ ハブ
４ 前縁
５ 後縁
６ 反り線
７ 円錐座標
８ 翼型
Ｃ 弦長[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blower impeller provided with mixed flow blades used in a blower of an air conditioner, and particularly relates to a cross-sectional shape of a blade of the impeller.
[0002]
[Prior art]
As disclosed in Patent Document 1, the conventional axial blower has a configuration as shown in FIGS. That is, the axial blower impeller 10 is configured by providing a plurality of thick blades of blades 11 in a radial shape on a cylindrical hub 12.
[0003]
A blade having a blade shape of a thick blade obtained by cutting the axial flow fan impeller 10 at a cylindrical coordinate B and developing the blade has a shape like a blade 13 in FIG. That is, the position of the maximum warp height of the warp line 14 was set to a position of 40% to 50% of the chord length from the front edge. Further, the warp line 14 is composed of two quadratic curves. Further, the maximum thickness of the airfoil is set to a position of 30% to 40% of the chord length from the leading edge.
[0004]
The axial flow fan 10 is housed in an appropriate casing and rotated to produce a blowing action.
Further, for example, Patent Document 2 discloses an impeller of a mixed flow blower. Unlike the normal mixed-flow impeller configuration, in order to shift the peeling point closer to the rear edge, the warp line has a maximum warp height position that is closer to the rear edge than the center of the front and rear edges. It has been done.
[0005]
[Patent Document 1]
JP-A-2001-234893 [0006]
[Patent Document 2]
JP-A-1-96499 [0007]
[Problems to be solved by the invention]
However, in the configuration of the above-described conventional axial flow fan, only the position of the maximum warp height of the warp line 14 of the blade 11 and the position of the maximum thickness of the airfoil of the thick blade are defined. In this case, only the position of the maximum warp height is shifted with the warp line as an arc wing, and there is no description regarding the radial distribution of the blades. Further, it only defines the maximum thickness position of the airfoil of the blade 13.
[0008]
In the first place, the warping line is an important factor that defines the aerodynamic performance of the blower. If the position of the maximum warp height is only 40% to 50% of the chord length from the leading edge and the distribution in the radial direction of the blade is not specified, sufficient aerodynamic performance is improved, that is, fan efficiency is improved. Can't hope.
[0009]
The maximum thickness position of the airfoil of the blade 13 is a factor that affects the noise performance of the blower. The fact that this position is 30% to 40% of the chord length from the leading edge is also disclosed in the NACA cascade data, and it has a low effect on low noise. This is known from our experiments as a known matter.
[0010]
Further, the configuration of the conventional mixed flow fan also discloses only the shape characteristics of the blade cross section from the leading edge to the trailing edge, and does not describe any distribution in the radial direction of the blades.
[0011]
[Means for Solving the Problems]
To accomplish the above object, in the mixed flow blower impeller type air conditioner blower impeller comprising a plurality of blades in a substantially frustoconical hub, the outer peripheral side chord length of the vane longer than the hub side chord length of the blade, showing the cross-sectional shape of the blade at the conical coordinates of the center line with a vertex on the center line was expanded by cutting the blade in a cone of a rotary shaft of the hub in case, lower than the maximum camber height of the arc blades maximum camber height of the camber line of the vane cross-section corresponding to the blade section, and, over the radial direction of the blade, the maximum camber height of the camber line and the arc blade A fan impeller for an air conditioner having a constant ratio to the maximum warp height of the air conditioner is provided.
[0012]
With the above configuration, the state of the inflow air with respect to the mixed flow blower impeller when the outdoor operation of the separate type air conditioner is in a steady operation is a steady state and constant. Therefore, since the warp height is lower than that in the case of the arc blade, the degree of streamline is stronger than that in the case of the arc blade with respect to the inflowing air. This reduces drag on the blades and improves fan efficiency. This effect is established over the radial direction of the blade.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1, in oblique flow fan impeller type air conditioner blower impeller comprising a plurality of blades in a substantially frustoconical hub, the outer peripheral side chord length of the vane the vane of longer than the hub-side chord length, in the case shown a cross-sectional shape of the blade centerline with a vertex on the center line in the conical coordinates deployed by cutting the blade in a cone of a rotary shaft of the hub , lower than the maximum camber height of the arc blades maximum camber height of the camber line of the vane cross-section corresponding to the blade section, and, over the radial direction of the blade, the maximum of the maximum camber height and arc wing camber line A fan impeller for an air conditioner having a constant ratio to the warp height is provided. The arc wings corresponding to the blade cross-section here are, as is well known to experts, in the blade cross-section in the cone coordinates, the entrance angle at the leading edge point, the leading edge, and the exit angle at the trailing edge. This means a single arc wing determined by
[0014]
And according to this structure, the state of inflow air with respect to the mixed flow fan impeller at the time of carrying out steady operation with the outdoor unit of a separate type air conditioner is a steady state, and is constant. Therefore, since the warp height is lower than that in the case of the arc blade, the degree of streamline is stronger than that in the case of the arc blade with respect to the inflowing air. This reduces the drag on the blades and improves fan efficiency (static pressure efficiency). This effect is established over the radial direction of the blade.
[0015]
According to a second aspect of the invention, the position of the maximum camber height of the camber line is, over the radial direction of the blade, all, than in the case of the arc blades, i.e. present in the front edge closer to the center point of the chord length A blower impeller for an air conditioner is provided. And this structure has the following effect. In general, the pressure of the blade gradually decreases from the leading edge to the maximum warp height position, and the pressure increases conversely from the portion past the maximum warp height position. Thus, from the viewpoint of fan efficiency (static pressure efficiency) rather than noise, this configuration can be used in any radial direction of the blades, so that the chord length and range of the pressure increasing portion of the blades can be increased. Thereby, since the head per number of rotations as work of the fan impeller for air conditioners can be enlarged, fan efficiency is improved as a result.
[0016]
According to a third aspect of the present invention, a blade shape of a thick wing is superimposed on a warp line so that a ratio t / C between a maximum thickness t and a chord length C is in a range of 5% to 12%. edge side and pointed airfoil vane shape, and is intended to provide an air conditioner blower impeller thickness is reduced according to the maximum thickness toward some or periphery constant over the radial direction of the blade . With this configuration, compared to thin blades with a constant thickness, the blades with a thick blade shape can prevent flow separation and achieve a low noise effect. It can be compatible with improvement. Furthermore, since the maximum thickness of the airfoil is constant in the radial direction or becomes thinner than the outer periphery, safety is high with respect to strength during rotation.
[0017]
【Example】
Below, the mixed flow fan impeller of one Example of this invention is demonstrated with reference to drawings.
[0018]
(Example 1)
A first embodiment of the present invention will be described with reference to FIGS.
1 is a perspective view of a mixed flow blower impeller for air conditioning, FIG. 2 is a plan view of the impeller, FIG. 3 is a meridian surface of the impeller, and FIG. 4 is an O 1 -A of FIG. It is the figure of the curvature line on the cone coordinate developed by cut | disconnecting by the cone of.
[0019]
As shown in the figure, in a mixed flow fan impeller 1 in which a plurality of thin blades 2 are provided on a substantially truncated cone-shaped hub 3, the outer chord length of the vanes 2 is larger than the chord length of the hub 2 of the vanes 2. long, with conical coordinates 7 which is expanded by cutting the blade 2 in a conical O 1 -A to the center line O 1 -O 2 and the rotary shaft having a vertex on the center line O 1 -O 2 hub 3 in the case shown the cross-sectional shape of the blade 2, a maximum camber height h of the camber line 6 is lower than the maximum camber height of the arc blades and, over the radial direction of the blade 2, a maximum camber height and arc camber line 6 the ratio r of the maximum warp height of the blade is constant.
[0020]
The conventional arc wing and the maximum warp height of the arc wing will be defined below with reference to FIG. In general, the chord length L is determined, and the entrance angle α formed between the tangent line of the warp line at the leading edge and the tangent line of the rotation edge line of the leading edge, and the tangent line of the warping line at the trailing edge and the rotation locus line of the trailing edge When the exit angle β formed between the tangent line and the tangent line is determined, the arc blade is uniquely defined. The maximum warp height h1 of the arc blade is the height of the warp line at the position of 50% of the chord length L.
[0021]
Of course, a motor shaft is fixed to the hub 3 of the mixed flow fan impeller 1 and placed in an appropriate casing and rotated by the motor to produce a blowing action. At this time, most of the air flows in from the leading edge 4 of the blade 2 and flows out from the trailing edge 5 to perform aerodynamic work.
[0022]
And by the said structure, the state of the inflow air with respect to the mixed flow fan impeller 1 at the time of steady operation with the outdoor unit of a separate type air conditioner is a steady state, and is constant. Therefore, since the warp height is lower than that in the case of the arc blade, the degree of streamline is stronger than that in the case where the warp line 6 is the arc blade with respect to the inflowing air. This reduces drag on the blades and improves fan efficiency. This effect is established over the radial direction of the blade.
[0023]
When a mixed flow blower with a thin blade of outer diameter Φ415 was tested with an outdoor unit of a separate air conditioner, r = maximum warp height / maximum of the arc blade compared to the case where the warp line was an arc blade. The mixed flow blower impeller 1 using the warp line with the warp height = 0.6 is excellent in efficiency ratio by 6%, and the rotation speed ratio per the same air volume increases by about 5%. However, noise has been found to increase by 0.4 dB.
[0024]
In addition, this configuration and effect are also realized in an axial flow fan for air conditioning.
(Example 2)
A second embodiment of the present invention will be described with reference to FIG.
[0025]
FIG. 5 is a diagram of a warp line on a conical coordinate obtained by cutting the impeller with a cone of O 1 -A in FIG. 2 and developing the impeller.
As shown in the figure, a cone having a vertex on the center line O 1 -O 2 of the hub 3 and developed by cutting the blade 2 with a cone O 1 -A having the center line O 1 -O 2 as a rotation axis. in the case shown the cross-sectional shape of the blade 2 at coordinates 7, the position L of the maximum camber height of the camber line 6, over the radial direction of the blade 2, all present in the leading edge closer than in the case of the arc blades. That is, L / C <0.5. Where C is the chord length of the blade.
[0026]
The configuration described above provides the following effects. In general, the pressure of the blade 2 gradually decreases from the leading edge 4 to the maximum warp height position, and the pressure increases from the portion past the maximum warp height position. Thus, from the viewpoint of fan efficiency rather than noise, this configuration can be used for any radial direction of the blade 2, so that the chord length and range of the pressure increasing portion of the blade can be increased. Thereby, since the head per number of rotations as work of the mixed flow fan impeller 1 of the air conditioner blower can be increased, the fan efficiency is improved as a result.
[0027]
When a mixed flow blower with a thin blade with an outer diameter of Φ415 was experimented with an outdoor unit of a separate air conditioner, a warp line with a L / C = 0.3 was obtained as compared with the case where the warp line was an arc blade. The mixed flow blower impeller 1 used is excellent in efficiency ratio by 3%, and the rotation speed ratio per same air volume increases by about 3%. However, it has been found that noise increases by 0.4 dB.
[0028]
In addition, this configuration and effect are also realized in an axial flow fan for air conditioning.
(Example 3)
A third embodiment of the present invention will be described with reference to FIGS.
[0029]
FIG. 6 is a diagram of a warp line on a conic coordinate, which is developed by cutting the impeller with the O 1 -A cone of FIG. FIG. 7 shows an experiment of a mixed-flow fan impeller 1 having an outer diameter of Φ415, in which the ratio of the maximum thickness t and the chord length C of the airfoil and the noise reduction effect are described in an outdoor unit of a separate air conditioner. This is the data.
[0030]
As shown in the figure, a cone having a vertex on the center line O 1 -O 2 of the hub 3 and developed by cutting the blade 2 with a cone O 1 -A having the center line O 1 -O 2 as a rotation axis. In the case where the cross-sectional shape of the blade 2 is indicated by the coordinate 7 , the blade shape 8 of the thick blade is superimposed on the warp line 6, and the ratio t / C between the maximum thickness t and the chord length C is 5% to 12%. a blade shape of the airfoil 8 having a sharp front edge 4 side so that the range and the maximum thickness is reduced in thickness toward the certain or periphery constant over the radial direction of the blade 2.
[0031]
With this configuration, compared to thin blades with a constant thickness, the blades with a thick blade shape can prevent flow separation and achieve a low noise effect. It can be compatible with improvement. From FIG. 7, it can be seen that the low noise effect starts to be exhibited when t / C is 5%, and that the effect is saturated at about 12%.
[0032]
Furthermore, since the maximum thickness t of the airfoil 8 is constant in the radial direction or becomes thinner than the outer periphery, safety is high with respect to strength during rotation.
In addition, this configuration and effect are also realized in an axial flow fan for air conditioning.
[0033]
【The invention's effect】
As apparent from the above embodiments, the invention according to claim 1, in oblique flow fan impeller type air conditioner blower impeller comprising a plurality of blades in a substantially frustoconical hub, the and the outer peripheral side chord length of the blade is longer than the hub-side chord length of the blade, said at expanded conical coordinates by cutting the blade in a cone of a rotary shaft center line a vertex on the center line of the hub in the case shown the blades of the cross-sectional shape, the lower the maximum camber height of the arc blades maximum camber height of the camber line corresponding to the blade section in the blade section, and, over the radial direction of the blade, camber line A blower impeller for an air conditioner in which the ratio between the maximum warp height of the arc and the maximum warp height of the arc blade is constant is provided. And according to this structure, the state of the inflow air with respect to the mixed flow fan impeller at the time of carrying out steady operation with the outdoor unit of a separate type air conditioner is a steady state, and is constant. Therefore, since the warp height is lower than that of the arc blade, the degree of the warp line is more streamlined than the arc blade with respect to the incoming air. This reduces drag on the blades and improves fan efficiency. This effect is established over the radial direction of the blade.
[0034]
According to the second aspect of the present invention, there is provided a fan impeller for an air conditioner in which the position of the maximum warp height of the warp line is all closer to the leading edge than in the case of the arc blade in the radial direction of the blade. It is to provide. And this structure has the following effect. In general, the pressure of the blade gradually decreases from the leading edge to the maximum warp height position, and the pressure increases conversely from the portion past the maximum warp height position. Therefore, from the viewpoint of fan efficiency rather than noise, this configuration can be used in any radial direction of the blades, so that the chord length and range of the boosted portion of the blades can be increased. Thereby, since the head per number of rotations as work of the fan impeller for air conditioners can be enlarged, fan efficiency is improved as a result.
[0035]
According to a third aspect of the present invention, a blade shape of a thick wing is superimposed on a warp line so that a ratio t / C between a maximum thickness t and a chord length C is in a range of 5% to 12%. edge side and pointed airfoil vane shape, and is intended to provide an air conditioner blower impeller thickness is reduced according to the maximum thickness toward some or periphery constant over the radial direction of the blade . With this configuration, compared to thin blades with a constant thickness, the blades with a thick blade shape can prevent flow separation and achieve a low noise effect. It can be compatible with improvement. Furthermore, since the maximum thickness of the airfoil is constant in the radial direction or becomes thinner than the outer periphery, safety is high with respect to strength during rotation.
[Brief description of the drawings]
FIG. 1 is a perspective view of a mixed flow blower impeller according to a first embodiment of the present invention.
FIG. 2 is a plan view of the mixed flow fan impeller according to the first embodiment of the present invention.
FIG. 3 is a meridian surface of the mixed flow fan impeller according to the first embodiment of the present invention.
4 is a diagram of a warp line on a cone coordinate developed by cutting the mixed flow blower impeller according to the first embodiment of the present invention with an O 1 -A cone in FIG. 3; FIG.
5 is a diagram of a warp line on a cone coordinate developed by cutting a mixed flow blower impeller according to a second embodiment of the present invention with a cone of O 1 -A in FIG. 3; FIG.
6 is a diagram of a warp line on a cone coordinate developed by cutting a mixed flow blower impeller according to a third embodiment of the present invention with an O 1 -A cone in FIG. 3; FIG.
FIG. 7 shows an impeller having an outer diameter of Φ415, in which the ratio of the maximum thickness t and the chord length C of the airfoil used for the blades of the mixed flow blower impeller of the third embodiment of the present invention and the noise reduction effect are described. Experimental data for outdoor unit of separate air conditioner.
FIG. 8 is a plan view of a conventional axial-flow fan impeller.
FIG. 9 is a meridional surface of a conventional axial fan blower.
FIG. 10 is a diagram of a warp line corresponding to FIG. 6 in a conventional circular arc blade mixed flow fan impeller.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mixed flow fan impeller 2 Blade 3 Hub 4 Front edge 5 Rear edge 6 Warp line 7 Conical coordinate 8 Airfoil C String length

Claims (3)

略円錐台状のハブに複数枚の羽根を設けてなる斜流送風機羽根車型の空気調和機用送風機羽根車において、前記羽根の外周側弦長が前記羽根のハブ側弦長より長くて、前記ハブの中心線上に頂点を有して中心線を回転軸とする円錐で前記羽根を切断して展開した円錐座標で前記羽根の断面形状を示した場合において、前記羽根断面における反り線の最大反り高さが前記羽根断面に対応する円弧翼の最大反り高さより低く、且つ、前記羽根の半径方向に渡って、反り線の最大反り高さと円弧翼の最大反り高さとの比が一定である空気調和機用送風機羽根車。In a mixed-flow fan impeller type air conditioner fan impeller in which a plurality of blades are provided on a substantially frustoconical hub, the outer chord length of the blade is longer than the hub chord length of the blade , in the case shown the cross-sectional shape of the blade conical coordinates deployed by cutting the blade in a cone to the center line and the rotation axis have a vertex on the center line of the hub, the maximum camber line at the blade section warp height is lower than the maximum camber height of the arc blade corresponding to the blade section, and, over the radial direction of the blade, is the ratio of the maximum camber height of the maximum camber height and arc wing camber line is constant Blower impeller for air conditioner. 反り線の最大反り高さの位置が、前記羽根の半径方向に渡って、すべて、円弧翼の場合より前縁寄りに存在する請求項１に記載の空気調和機用送風機羽根車。Position of the maximum camber height of the camber line is, over the radial direction of the blade, all air conditioner blower impeller of claim 1 which is present in the front edge closer than in the case of the arc blades. 反り線に厚翼の翼型を重畳して、その最大厚みｔと弦長Ｃとの比ｔ／Ｃが、５％から１２％の範囲となるように前縁側が尖った翼型の羽根形状とし、且つ、最大厚みが前記羽根の半径方向に渡って一定である或いは外周に向かうにしたがって厚みが減少する請求項１または２に記載の空気調和機用送風機羽根車。A wing-shaped blade shape with a leading edge pointed so that the ratio t / C of the maximum thickness t to the chord length C is in the range of 5% to 12% by superimposing a thick wing airfoil on the warp line and then, and air conditioner blower impeller according to claim 1 or 2 thickness is reduced according to the maximum thickness toward some or periphery constant over the radial direction of the blade.
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JP2019056309A (en) * 2017-09-20 2019-04-11 ミネベアミツミ株式会社 Axial flow fan
CN110111915B (en) * 2019-06-03 2024-03-08 华北电力大学 Pressure-restraining cooling system suitable for small-sized stacks

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