JP4243105B2 - Impeller - Google Patents

Impeller Download PDF

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Publication number
JP4243105B2
JP4243105B2 JP2003004469A JP2003004469A JP4243105B2 JP 4243105 B2 JP4243105 B2 JP 4243105B2 JP 2003004469 A JP2003004469 A JP 2003004469A JP 2003004469 A JP2003004469 A JP 2003004469A JP 4243105 B2 JP4243105 B2 JP 4243105B2
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JP
Japan
Prior art keywords
blade
front edge
impeller
leading edge
circumferential
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2003004469A
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Japanese (ja)
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JP2003193997A (en
Inventor
誠司 白濱
和郎 荻野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Ecology Systems Co Ltd
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Panasonic Ecology Systems Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to JP2003004469A priority Critical patent/JP4243105B2/en
Publication of JP2003193997A publication Critical patent/JP2003193997A/en
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Description

【0001】
【発明の属する技術分野】
本発明は、換気送風機器に使用される軸流または斜流羽根車に関する。
【0002】
【従来の技術】
従来の羽根車について図5を参照しながら説明する。
【0003】
図に示すように、ブレード103の任意の周方向断面において1円弧翼または複数円弧翼または薄肉翼型で、ある流量でブレードの入り口角に沿って気流105が流入するように構成されていた。
【0004】
【発明が解決しようとする課題】
このような従来の羽根車では、流量が変化したとき気流は流入角αをもってブレード103に流入するため、ブレード103の前縁103cで気流105の剥離が発生し、送風性能が低下し、騒音が上昇するという課題があり、またルーバーまたはフィルターまたはコイルが羽根車に前置されているとき、気流105は時間または半径方向位置で変化する流入角αをもってブレード103に流入するため、ブレード103の前縁103cで気流105の剥離が発生し、送風性能が低下し、騒音が上昇するという課題がある。
【0005】
本発明は、このような従来の課題を解決するものであり、気流が流入角をもってブレードに流入するときのブレードの前縁での気流の剥離を抑制し、送風性能が向上でき、騒音を低減することができる羽根車を提供することを目的としている。
【0008】
【課題を解決するための手段】
本発明の羽根車は上記目的を達成するために、ハブの周りに複数のブレードを配置した軸流または斜流羽根車で、前記ブレードの正圧面の周方向前縁側の全部または一部に、周方向断面形状が前記ブレードの弦長Bに対し、前縁から1%〜15%の範囲に1%〜5%の幅で1%〜5%の高さの肉厚を設け、前記肉厚の周方向断面形状が略半円形状であり、前記ブレードの正圧面の前記肉厚前縁側端より前縁側に流入する気流の負圧面側への回り込みが抑制されるように、前記ブレードの周方向断面で、前記肉厚前縁側端の前記ブレードの正圧面の接線と、前記肉厚前縁側端と前記ブレードの前縁を結ぶ直線のなす角θが−30°≦θ≦30°である羽根車としたものである。
【0009】
本発明によれば、ブレードの前縁での気流の剥離を抑制し、送風性能が向上でき、騒音を低減することができる羽根車が得られる。
【0010】
【発明の実施の形態】
本発明は、ハブの周りに複数のブレードを配置した軸流または斜流羽根車で、前記ブレードの正圧面の周方向前縁側の全部または一部に、周方向断面形状が前記ブレードの弦長Bに対し、前縁から1%〜15%の範囲に1%〜5%の幅で1%〜5%の高さの肉厚を設けた羽根車としたものであり、流量が変化したとき気流は流入角をもってブレードに流入し、またルーバーまたはフィルターまたはコイルが羽根車に前置されたとき、気流は時間または半径方向位置により変化する流入角をもってブレードに流入するが、ブレードの正圧面の前縁に設けた肉厚により、気流はコアンダー効果により肉厚に沿って滑らかにブレードに流入するため、前縁での剥離が抑制され、また前縁から1%〜15%の範囲に肉厚を設けたため、前縁は薄肉であり、ブレードの正圧面に向かう気流が前縁端で衝突し負圧面に回り込むことが抑制され、送風効率の低下が抑制され、送風性能が向上でき、騒音を低減できるという作用を有する。
【0011】
また、肉厚の周方向断面形状が略半円形状である羽根車としたものであり、気流が肉厚に滑らかに流入するため、肉厚への気流の衝突、肉厚後方での気流の剥離が抑制され、送風性能が向上でき、騒音を低減できるという作用を有する。
【0012】
また、ブレードの周方向断面で、肉厚前縁側端のブレードの正圧面の接線と、肉厚前縁側端とブレードの前縁を結ぶ直線のなす角θが−30°≦θ≦30°である羽根車としたものであり、ブレードの正圧面の肉厚前縁側端より前縁に流入する気流の負圧側への回り込みが抑制され、送風性能が向上でき、騒音を低減できるという作用を有する。
【0013】
以下、本発明の実施例について図面を参照しながら説明する。
【0014】
【実施例】
(実施例1)
図1および図2に示すように、ハブ2の周りに複数のブレード3を配置した羽根車1で、前記ブレード3の正圧面3aの周方向前縁3c側の全部または一部に、周方向断面形状が前記ブレード3の弦長Bに対し、前縁から1%〜15%の範囲に1%〜5%の幅で1%〜5%の高さの肉厚4を設けた構成にされている。
【0015】
上記構成により、流量が変化したとき気流5は流入角αをもってブレード3に流入し、またルーバーまたはフィルターまたはコイルが羽根車1に前置されたとき、気流5は時間または半径方向位置により変化する流入角αをもってブレード3に流入するが、ブレード3の正圧面3aの前縁3c側に肉厚4を設けたため、図2(a)に示すように気流5はコアンダー効果により肉厚4に沿って滑らかにブレード3に流入し、前縁3cでの剥離が抑制され、また前縁3cから1%〜15%の範囲に肉厚を設けたため、前縁3cは薄肉であり、図2(b)に示すように、ブレード3の正圧面3aに向かう気流5が前縁3cで衝突し負圧面3bに回り込むことが抑制され、送風効率の低下が抑制され、送風性能が向上でき、騒音を低減することができる。
【0016】
(実施例2)
図1および図3に示すように、肉厚4の周方向断面形状が略半円形状である構成にされている。
【0017】
上記構成により、気流6が肉厚4に滑らかに流入するため、肉厚4への気流の衝突、肉厚4後方での気流6の剥離が抑制され、送風性能が向上でき、騒音を低減することができる。
【0018】
(実施例3)
図1および図4に示すように、ブレード3の周方向断面で、肉厚前縁側端4aのブレード3の正圧面3aと接線Tと、肉厚前縁側端4aとブレード3の前縁3cを結ぶ直線Lのなす角θが−30°≦θ≦30°である構成にされている。
【0019】
上記構成により、ブレード3の正圧面3aの肉厚前縁側端4aより前縁3c側に流入する気流7の負圧面3b側への回り込みが抑制され、送風性能が向上でき、騒音を低減することができる。
【0020】
【発明の効果】
以上の実施例から明らかなように、本発明によれば、ハブの周りに複数のブレードを配置した軸流または斜流羽根車で、前記ブレードの正圧面の周方向前縁側の全部または一部に、周方向断面形状が前記ブレードの弦長Bに対し、前縁から1%〜15%の範囲に1%〜5%の幅で1%〜5%の高さの肉厚を設け、前記肉厚の周方向断面形状が略半円形状であり、前記ブレードの正圧面の前記肉厚前縁側端より前縁側に流入する気流の負圧面側への回り込みが抑制されるように、前記ブレードの周方向断面で、前記肉厚前縁側端の前記ブレードの正圧面の接線と、前記肉厚前縁側端と前記ブレードの前縁を結ぶ直線のなす角θが−30°≦θ≦30°である羽根車としたことにより、ブレードの正圧面の肉厚前縁側端より前縁に流入する気流の負圧側への回り込みが抑制され、送風性能が向上でき、騒音を低減することができる羽根車を提供できる。
【図面の簡単な説明】
【図1】本発明の実施例1、2、3の羽根車を示す正面図
【図2】同実施例1の羽根車を示す周方向断面図
【図3】同実施例2の羽根車を示す周方向断面図
【図4】同実施例3の羽根車を示す周方向断面図
【図5】従来の羽根車を示す周方向断面図
【符号の説明】
1 羽根車
2 ハブ
3 ブレード
3a 正圧面
3b 負圧面
3c 前縁
B 弦長
4 肉厚
4a 肉厚前縁側端
5 気流
α 流入角
6 気流
T 接線
L 直線
θ 角度
7 気流
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an axial flow or mixed flow impeller used in a ventilation fan.
[0002]
[Prior art]
A conventional impeller will be described with reference to FIG.
[0003]
As shown in the figure, the air flow 105 flows along the entrance angle of the blade at a certain flow rate with a single arc blade, a plurality of arc blades, or a thin blade type in an arbitrary circumferential section of the blade 103.
[0004]
[Problems to be solved by the invention]
In such a conventional impeller, when the flow rate is changed, the airflow flows into the blade 103 with an inflow angle α, and therefore, the airflow 105 is peeled off at the front edge 103c of the blade 103, the air blowing performance is reduced, and noise is generated. When the louver or filter or coil is placed in front of the impeller, the air flow 105 flows into the blade 103 with an inflow angle α that changes in time or radial position. There is a problem in that separation of the air flow 105 occurs at the edge 103c, blowing performance is reduced, and noise is increased.
[0005]
The present invention solves such a conventional problem and suppresses separation of the airflow at the leading edge of the blade when the airflow flows into the blade with an inflow angle, thereby improving the blowing performance and reducing noise. An object is to provide an impeller that can be used.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the impeller of the present invention is an axial flow or mixed flow impeller in which a plurality of blades are arranged around a hub, and all or part of the circumferential front edge side of the pressure surface of the blade is A thickness of 1% to 5% with a width of 1% to 5% is provided in the range of 1% to 15% from the leading edge with respect to the chord length B of the blade in the circumferential direction. The circumferential cross-sectional shape of the blade is substantially semicircular, and the blade surface is controlled so that the airflow flowing into the leading edge side from the thick leading edge side end of the pressure surface of the blade is suppressed from flowing to the suction surface side. in cross section, the tangent of the positive pressure surface of the blade of the thick front edge end, the angle of the straight line connecting the leading edge of the said thick front edge end blade theta is at -30 ° ≦ θ ≦ 30 ° It is an impeller.
[0009]
ADVANTAGE OF THE INVENTION According to this invention, the impeller which can suppress peeling of the airflow in the front edge of a braid | blade, can improve ventilation performance, and can reduce a noise is obtained.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is an axial flow or mixed flow impeller in which a plurality of blades are arranged around a hub, and a circumferential cross-sectional shape is formed on the chord length of the blades on all or part of the circumferential front edge side of the pressure surface of the blades. With respect to B, the impeller has a width of 1% to 5% and a thickness of 1% to 5% in the range of 1% to 15% from the leading edge, and the flow rate has changed. Airflow flows into the blade with an inflow angle, and when a louver or filter or coil is placed in front of the impeller, the airflow flows into the blade with an inflow angle that varies with time or radial position, but on the pressure side of the blade. Due to the wall thickness provided at the leading edge, the airflow smoothly flows into the blade along the wall thickness due to the Counder effect, so that peeling at the leading edge is suppressed, and the wall thickness is in the range of 1% to 15% from the leading edge. The leading edge is thin. It is suppressed that air flow toward the pressure side of the blade around to the negative pressure surface collide with the front edge end, is suppressed decrease in the blowing efficiency can be improved blowing performance, it has an effect of reducing noise.
[0011]
In addition, the impeller has a substantially semicircular cross-sectional shape in the circumferential direction, and the airflow smoothly flows into the thickness, so the collision of the airflow with the thickness and the flow of airflow behind the thickness Separation is suppressed, air blowing performance can be improved, and noise can be reduced.
[0012]
Further, in the circumferential cross section of the blade, an angle θ formed by a tangent to the pressure surface of the blade on the wall thickness front edge side and a straight line connecting the wall thickness front edge side end and the blade front edge is −30 ° ≦ θ ≦ 30 °. It is an impeller, and has the effect that the airflow flowing into the leading edge from the thick leading edge side end of the pressure surface of the blade is suppressed from flowing to the negative pressure side, and the air blowing performance can be improved and noise can be reduced. .
[0013]
Embodiments of the present invention will be described below with reference to the drawings.
[0014]
【Example】
(Example 1)
As shown in FIGS. 1 and 2, in the impeller 1 in which a plurality of blades 3 are arranged around the hub 2, a circumferential direction is formed on all or a part of the positive pressure surface 3 a of the blade 3 on the circumferential front edge 3 c side. The cross-sectional shape is a configuration in which a wall thickness 4 of 1% to 5% and a height of 1% to 5% is provided in the range of 1% to 15% from the leading edge with respect to the chord length B of the blade 3. ing.
[0015]
With the above configuration, when the flow rate changes, the air flow 5 flows into the blade 3 with an inflow angle α, and when the louver or filter or coil is placed in front of the impeller 1, the air flow 5 changes with time or radial position. Although it flows into the blade 3 with an inflow angle α, since the thickness 4 is provided on the front edge 3c side of the pressure surface 3a of the blade 3, the airflow 5 follows the thickness 4 due to the corander effect as shown in FIG. 2b smoothly flows into the blade 3 and is prevented from being peeled off at the front edge 3c. Further, since the thickness is provided in the range of 1% to 15% from the front edge 3c, the front edge 3c is thin, and FIG. ), The airflow 5 toward the positive pressure surface 3a of the blade 3 is prevented from colliding with the front edge 3c and entering the negative pressure surface 3b, so that a decrease in blowing efficiency is suppressed, blowing performance can be improved, and noise is reduced. can do .
[0016]
(Example 2)
As shown in FIG. 1 and FIG. 3, the circumferential cross-sectional shape of the wall thickness 4 is a substantially semicircular shape.
[0017]
With the above configuration, since the airflow 6 flows smoothly into the wall thickness 4, collision of the airflow with the wall thickness 4, separation of the airflow 6 behind the wall thickness 4 can be suppressed, air blowing performance can be improved, and noise can be reduced. be able to.
[0018]
(Example 3)
As shown in FIGS. 1 and 4, in the circumferential cross section of the blade 3, the pressure surface 3 a and the tangent line T of the blade 3 at the thick leading edge side end 4 a, the thick leading edge side end 4 a and the leading edge 3 c of the blade 3 are shown. The angle θ formed by the connecting straight line L is configured such that −30 ° ≦ θ ≦ 30 °.
[0019]
With the above-described configuration, the airflow 7 flowing from the thick front edge side end 4a of the positive pressure surface 3a of the blade 3 to the front edge 3c side is suppressed from flowing to the negative pressure surface 3b side, air blowing performance can be improved, and noise can be reduced. Can do.
[0020]
【The invention's effect】
As is clear from the above embodiments, according to the present invention, in the axial flow or mixed flow impeller in which a plurality of blades are arranged around the hub, all or part of the circumferential front edge side of the pressure surface of the blades. In addition, the circumferential cross-sectional shape is 1% to 5% wide and 1% to 5% thick with respect to the chord length B of the blade in the range of 1% to 15% from the front edge, The blade has a substantially semicircular cross-sectional shape in the circumferential direction, and the blade faces the pressure surface of the blade so that the airflow flowing into the front edge side from the front edge side of the wall thickness is suppressed from flowing to the suction surface side. In the circumferential cross section, an angle θ formed by a tangent to the pressure surface of the blade at the thick leading edge side end and a straight line connecting the thick leading edge side end and the leading edge of the blade is −30 ° ≦ θ ≦ 30 °. The impeller is a negative airflow that flows into the leading edge from the thick leading edge side end of the pressure surface of the blade. Wraparound to the side been suppressed, it can improve the blowing performance can be provided an impeller capable of reducing noise.
[Brief description of the drawings]
FIG. 1 is a front view showing impellers of Examples 1, 2, and 3 of the present invention. FIG. 2 is a circumferential sectional view showing an impeller of Example 1. FIG. 3 shows an impeller of Example 2. FIG. 4 is a circumferential sectional view showing an impeller according to the third embodiment. FIG. 5 is a circumferential sectional view showing a conventional impeller.
DESCRIPTION OF SYMBOLS 1 Impeller 2 Hub 3 Blade 3a Positive pressure surface 3b Negative pressure surface 3c Leading edge B Chord length 4 Thickness 4a Thickness leading edge side end 5 Air flow α Inflow angle 6 Air flow T Tangent L Straight line θ Angle 7 Air flow

Claims (1)

ハブの周りに複数のブレードを配置した軸流または斜流羽根車で、前記ブレードの正圧面の周方向前縁側の全部または一部に、周方向断面形状が前記ブレードの弦長Bに対し、前縁から1%〜15%の範囲に1%〜5%の幅で1%〜5%の高さの肉厚を設け、前記肉厚の周方向断面形状が略半円形状であり、前記ブレードの正圧面の前記肉厚前縁側端より前縁側に流入する気流の負圧面側への回り込みが抑制されるように、前記ブレードの周方向断面で、前記肉厚前縁側端の前記ブレードの正圧面の接線と、前記肉厚前縁側端と前記ブレードの前縁を結ぶ直線のなす角θが−30°≦θ≦30°である羽根車。 In an axial flow or mixed flow impeller in which a plurality of blades are arranged around a hub, a circumferential cross-sectional shape with respect to a chord length B of the blade on all or part of a circumferential front edge side of the pressure surface of the blade, A thickness of 1% to 5% with a width of 1% to 5% is provided in a range of 1% to 15% from the leading edge, and the circumferential cross-sectional shape of the thickness is substantially semicircular, as wraparound to the blade pressure side the thick suction side of the air flow flowing from the front edge end to the front edge of the suppression, of the blade in the circumferential direction section, of the blade of the thick front edge end the tangent of the pressure side, the thick front edge end and straight angle theta is -30 ° ≦ θ ≦ 30 ° der Ru fEATHER car connecting the leading edge of the blade.
JP2003004469A 2003-01-10 2003-01-10 Impeller Expired - Fee Related JP4243105B2 (en)

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JP32781698A Division JP2000154798A (en) 1998-11-18 1998-11-18 Impeller

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JP4243105B2 true JP4243105B2 (en) 2009-03-25

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* Cited by examiner, † Cited by third party
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US8038406B2 (en) * 2006-08-25 2011-10-18 Sanyo Electric Co., Ltd. Axial fan and blade design method for the same
JP2013209956A (en) * 2012-03-30 2013-10-10 Sanyo Denki Co Ltd Axial flow fan
MY182874A (en) * 2013-10-01 2021-02-05 Sharp Kk Propeller fan and blower
JP6980921B2 (en) * 2018-08-06 2021-12-15 シャープ株式会社 Propeller fan and blower

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