JP3855533B2 - Mixed flow fan - Google Patents

Mixed flow fan Download PDF

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Publication number
JP3855533B2
JP3855533B2 JP13529599A JP13529599A JP3855533B2 JP 3855533 B2 JP3855533 B2 JP 3855533B2 JP 13529599 A JP13529599 A JP 13529599A JP 13529599 A JP13529599 A JP 13529599A JP 3855533 B2 JP3855533 B2 JP 3855533B2
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Japan
Prior art keywords
blade
vicinity
hub
midpoint
edge
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JP13529599A
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JP2000329098A (en
Inventor
善樹 泉
孝 杉尾
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、空気調和機における冷凍サイクルの室外機内の凝縮器等の冷却、その他に使用する斜流送風機に関する。
【０００２】
【従来の技術】
従来の薄翼の斜流送風機において羽根車２１は、図５、図６に示すように、略円錐台形状のハブ２３の外周に薄翼の複数枚の羽根２２を一体に設けて構成していた。そして、羽根２２はその回転軌跡図上で、羽根の前縁２５の中点と後縁２６の中点を結ぶ一点鎖線Ｂ−Ｂ付近を境にして前縁２５を、その中点付近より外周側は風上側に対して凹形状の曲線に、前記中点付近よりハブ２３側は凸形状の曲線にそれぞれ形成している。また、羽根２２はその回転軌跡図上で、後縁２６をハブ２３側から外周２４側にかけて直線に形成していた。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記従来の構成において、羽根２２の後縁２６がハブ２３から外周２４側まで直線で、かつ前縁２５がその中点付近よりハブ２３側にかけて風上側に対して凸形状に構成しているため、空力仕事にあまり作用しない羽根２２のハブ２３付近の翼面積が大きくなっている。すなわち、空力仕事にあまり寄与しないハブ２３付近の翼面積が大きいために、翼の摩擦抵抗による空力損失が発生し流体騒音の増加をもたらし、従って前記摩擦抵抗の低減による流体騒音の低下が要求されていた。
【０００４】
本発明は、このような従来技術の課題を解決する斜流送風機であり、低騒音化を目的とする。
【０００５】
【課題を解決するための手段】
上記課題を解決するために本発明は、羽根車のハブの外周に厚さ一定の薄翼の複数枚の羽根を有し、この羽根の回転軌跡図上において、羽根の前縁はこの前縁の中点付近より外周側を風上側に対して凹形状の曲線に、前記中点付近よりハブ側を風上側に対して凸形状の曲線にそれぞれ形成し、前記羽根の後縁はこの後縁の中点付近よりハブ側を風上側に対して凸形状の曲線に、前記中点付近より外周側は直線状をした略曲線にそれぞれ形成してなる斜流送風機である。
【０００６】
上記構成により、空力仕事にあまり寄与しないハブ付近の翼面積が小さくなり、翼の摩擦抵抗の低減による流体騒音の低下が図れる。
【０００７】
【発明の実施の形態】
本発明の請求項１に記載の発明は、モ−タと、このモ−タに駆動される羽根車とを備え、前記羽根車はハブの外周に厚さ一定の薄翼の複数枚の羽根を有し、この羽根の回転軌跡図上において、羽根の前縁はこの前縁の中点付近より外周側を風上側に対して凹形状の曲線に、前記中点付近よりハブ側を風上側に対して凸形状の曲線にそれぞれ形成し、前記羽根の後縁はこの後縁の中点付近よりハブ側を風上側に対して凸形状の曲線に、前記中点付近より外周側は直線状をした略曲線にそれぞれ形成してなるものである。
【０００８】
上記構成において、羽根の回転軌跡図上で、羽根の前縁の中点付近よりハブ側を風上側に対して凸形状の曲線に、また羽根の後縁はこの後縁の中点付近よりハブ側を風上側に対して凸形状の曲線にそれぞれ形成してハブ付近の翼面積が小さくなり、翼の摩擦抵抗が低減される。
【０００９】
本発明の請求項２に記載の発明は、モータと、このモータに駆動される羽根車とを備え、前記羽根車はハブの外周に厚翼の複数枚の羽根を有し、この羽根の回転軌跡図上において、羽根の前縁はこの前縁の中点付近より外周側を風上側に対して凹形状の曲線に、前記中点付近よりハブ側を風上側に対して凸形状の曲線にそれぞれ形成し、前記羽根の後縁はこの後縁の中点付近よりハブ側を風上側に対して凸形状の曲線に、前記中点付近より外周側は直線状をした略曲線にそれぞれ形成してなるものである。
また、請求項３に記載の発明は、請求項２記載に係る発明において厚翼の羽根で、その前縁の中点と後縁の中点を結ぶ流路中心線上の断面展開における羽根の最大厚みｔと弦長ｃの比ｔ／ｃを、５〜１２％の範囲に設定し、かつ羽根の前縁は円弧状をし、羽根の後縁は尖った翼型形状をしたものである。
【００１０】
上記構成において、厚さ一定の薄い翼に比較して、厚い翼の翼型形状をした羽根になり、流体の剥離が防止される。
【００１１】
【実施例】
以下本発明の実施例について図面を参照して説明する。
【００１２】
（実施例１）
本発明の実施例１における発明を、図１〜図３に従い説明する。図１は斜流送風機における羽根車の動作状態を示す模式図、図２は斜流送風機の正面図、図３は斜流送風機における羽根車の回転軌跡図である。
【００１３】
１は斜流送風機の合成樹脂製の羽根車で、厚さ一定の複数枚の羽根２が略円錐台形状のハブ３の外周面に一体に形成してある。そして、この羽根車１は、ハブ３をモ−タ４のシャフトに固定し、適切なケ−シング５に納め、モ−タ４により回転させることで送風作用を行う。この送風は、羽根車２が回転し、図１の矢印に示すように空気の殆どは羽根２の前縁６より流入し、後縁７より流出して空力仕事を行う。
【００１４】
羽根２は図３に示すように、その回転軌跡図上で、羽根の前縁６の中点と後縁７の中点を結ぶ一点鎖線Ａ−Ａ（流路中心線Ａ−Ａともいう）付近を境にして前縁６を、その中点付近より外周８側（チップともいう）は風上側に対して凹形状の曲線６ａに、前記中点付近よりハブ３側は風上側に対して凸形状の曲線６ｂにそれぞれ形成している。また、羽根２はその回転軌跡図上で、後縁７を前記中点付近よりハブ３側は風上側に対して凸形状の曲線７ｂに、前記中点付近より外周８側は直線状をした略曲線７ａにそれぞれ形成している。
【００１５】
上記構成において、羽根２の前縁６はその中点付近よりハブ３側を風上側に対して凸形状の曲線６ａにすることでハブ３付近の翼面積が増大するものの、一方で後縁７の中点付近よりハブ３側を風上側に対して凸形状の曲線７ｂに形成しているので、従来技術よりもハブ３付近の翼面積を低減できるのである。従って、送風機の空力仕事に余り寄与しないハブ３付近の翼面積を低減して翼の摩擦抵抗を減少させ流体騒音を低減できる。その具体的効果は、外径Φが４００ｍｍの羽根車１の送風機で実験すると、１ｄＢ（Ａ）の低騒音効果を得られた。
【００１６】
なお、羽根２は合成樹脂製で２〜３ｍｍの一定の薄い翼であるが、金属で形成して厚さをもっと薄くできるものである。
【００１７】
（実施例２）
本発明の実施例２における発明を、図４に従い説明する。図４は斜流送風機における羽根車の流路中心線Ａ−Ａ上の断面展開図である。この実施例２の発明は、羽根の最大厚みと弦長の比を、特定の範囲に設定した点が、一定厚みの羽根を有する実施例１の斜流送風機と異なり、それ以外の構成および作用効果は同じなので異なる点のみを中心に説明をする。
【００１８】
羽根１２は、図４のように羽根１２の前縁の中点と後縁の中点を結ぶ流路中心線Ａ−Ａ上の断面展開における最大厚みｔと弦長ｃの比ｔ／ｃが、５〜１２％の範囲にある前縁が円弧状１２ａで、かつ後縁が尖った翼型形状１２ｂをした厚い翼に形成したものである。
【００１９】
上記構成において、厚さが一定の薄い翼に比較し、最大厚みｔと弦長ｃの比ｔ／ｃが、５〜１２％の範囲にある厚翼の前縁が円弧状１２ａで、かつ後縁が尖った翼型形状１２ｂをした羽根１２であるから、この羽根１２からの流体の流れの剥離が防がれ、更なる低騒音化を達成できる。但し、羽根の最大厚みｔと弦長ｃの比ｔ／ｃが５％から低騒音効果を発揮し始め、前記比ｔ／ｃが１２％で低騒音効果が飽和する。ちなみに、外径Φが４００ｍｍ斜流送風機の羽根車で、羽根の最大厚みｔと弦長ｃの比ｔ／ｃが９％の厚翼を用いて実験すると、薄い翼に比較して２ｄＢ（Ａ）の低騒音効果が得られた。
【００２０】
なお、上記実施例２おいて、羽根１２の最大厚みｔと弦長ｃの比ｔ／ｃを、５〜１２％の範囲に設定したのは、羽根１２の前縁の中点と後縁の中点を結ぶ流路中心線Ａ−Ａ上の断面展開においてであるが、必ずしも羽根１２の前縁の中点と後縁の中点を結ぶ流路中心線Ａ−Ａ上でなくても前縁の中点と後縁の中点から左右へ多少ずれた線であっても、実質的に同様の効果を期待できるものである。また、上記実施例１、実施例２の発明は斜流送風機に限らず、軸流送風機の羽根車に採用しても同様の効果を得られることはもちろんである。
【００２１】
【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、モ−タと、このモ−タに駆動される羽根車とを備え、前記羽根車はハブの外周に厚さ一定の薄翼の複数枚の羽根を有し、この羽根の回転軌跡図上において、羽根の前縁はこの前縁の中点付近より外周側を風上側に対して凹形状の曲線に、前記中点付近よりハブ側を風上側に対して凸形状の曲線にそれぞれ形成し、前記羽根の後縁はこの後縁の中点付近よりハブ側を風上側に対して凸形状の曲線に、前記中点付近より外周側は直線状をした略曲線にそれぞれ形成してなるもので、ハブ付近の翼面積を小さくせしめて翼の摩擦抵抗を低減し流体騒音を低減できる。
【００２２】
また、請求項２に記載の発明は、請求項１記載に係る発明において厚翼の羽根で、さらに請求項３は、その前縁の中点と後縁の中点を結ぶ流路中心線上の断面展開における羽根の最大厚みｔと弦長ｃの比ｔ／ｃを、５〜１２％の範囲に設定し、かつ羽根の前縁は円弧状をし、羽根の後縁は尖った翼型形状をしたもので、厚さ一定の薄い翼に比較し、流体の剥離が防止され、更に低騒音化を果たすことができる。
【図面の簡単な説明】
【図１】図１は本発明斜流送風機における実施例１の羽根車の動作状態を示す模式図
【図２】図２は同斜流送風機の正面図
【図３】図３は同斜流送風機における羽根車の回転軌跡図
【図４】図４は同斜流送風機における実施例２の羽根車の流路中心線Ａ−Ａ上の断面展開図
【図５】従来の斜流送風機の羽根車の正面図
【図６】同羽根車の回転軌跡図
【符号の説明】
１ 羽根車
２ 羽根
３ ハブ
６ 前縁
６ａ 凹形状の曲線
７ 後縁
７ａ 直線状をした略曲線
６ｂ，７ｂ 凸形状の曲線
８ 外周
１２ 羽根
１２ａ 円弧状
１２ｂ 翼型形状[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mixed flow blower used for cooling a condenser or the like in an outdoor unit of a refrigeration cycle in an air conditioner, and the like.
[0002]
[Prior art]
As shown in FIGS. 5 and 6, the impeller 21 in the conventional thin-bladed mixed flow blower is configured by integrally providing a plurality of thin blades 22 on the outer periphery of a substantially truncated cone-shaped hub 23. It was. Then, on the rotation locus diagram of the blade 22, the front edge 25 is surrounded from the vicinity of the middle point by the vicinity of the alternate long and short dash line BB connecting the middle point of the front edge 25 of the blade and the middle point of the rear edge 26. The side is formed into a concave curve with respect to the windward side, and the hub 23 side is formed into a convex curve from the vicinity of the midpoint. Further, the blades 22 are formed in a straight line from the hub 23 side to the outer periphery 24 side on the rotation locus diagram.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, the trailing edge 26 of the blade 22 is straight from the hub 23 to the outer periphery 24 side, and the leading edge 25 has a convex shape with respect to the windward side from the middle point to the hub 23 side. Therefore, the blade area in the vicinity of the hub 23 of the blade 22 that does not act much on aerodynamic work is large. That is, since the blade area in the vicinity of the hub 23 that does not contribute much to aerodynamic work is large, aerodynamic loss due to the frictional resistance of the blades is generated, resulting in an increase in fluid noise. Accordingly, a decrease in fluid noise due to the reduction of the frictional resistance is required. It was.
[0004]
The present invention is a mixed flow blower that solves such problems of the prior art, and aims to reduce noise.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention has a plurality of thin blades having a constant thickness on the outer periphery of a hub of an impeller, and the leading edge of the blade is the leading edge on the rotation locus diagram of the blade. The outer peripheral side from the vicinity of the middle point is formed into a concave curve with respect to the windward side, and the hub side from the vicinity of the middle point is formed into a convex curve with respect to the windward side, and the trailing edge of the blade is the trailing edge. In the mixed flow blower, the hub side is formed into a convex curve with respect to the windward side from the vicinity of the middle point, and the outer peripheral side from the vicinity of the middle point is formed into a substantially curved line.
[0006]
With the above configuration, the blade area near the hub that does not contribute much to aerodynamic work is reduced, and fluid noise can be reduced by reducing the frictional resistance of the blade.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention includes a motor and an impeller driven by the motor, and the impeller has a plurality of thin blades having a constant thickness on the outer periphery of the hub. On the rotation trajectory diagram of this blade, the leading edge of the blade has a concave curve with respect to the windward side from the vicinity of the midpoint of this front edge, and the hub side from the vicinity of the midpoint to the windward side The trailing edge of the blade is a convex curve with respect to the windward side from the vicinity of the midpoint of the trailing edge, and the outer peripheral side is linear from the vicinity of the midpoint. Each is formed in a substantially curved line.
[0008]
In the above configuration, on the rotation trajectory diagram of the blade, the hub side has a convex curve from the vicinity of the midpoint of the leading edge of the blade, and the trailing edge of the blade is the hub from near the midpoint of this trailing edge. Each side is formed into a convex curve with respect to the windward side, the blade area near the hub is reduced, and the frictional resistance of the blade is reduced.
[0009]
The invention according to claim 2 of the present invention includes a motor and an impeller driven by the motor, and the impeller has a plurality of thick blades on the outer periphery of the hub, and the rotation of the blades. On the trajectory diagram, the front edge of the blade has a concave curve with respect to the windward side from the vicinity of the midpoint of this front edge, and the hub side from the vicinity of the midpoint has a convex curve with respect to the windward side. The trailing edge of the blade is formed in a convex curve from the vicinity of the middle point of the trailing edge toward the windward side from the vicinity of the hub side, and is formed in a substantially curved line on the outer peripheral side from the vicinity of the middle point. It will be.
The invention according to claim 3 is the blade of the thick wing in the invention according to claim 2 , and the maximum of the blade in the cross-sectional development on the flow path center line connecting the midpoint of the leading edge and the midpoint of the trailing edge. The ratio t / c of the thickness t and the chord length c is set in the range of 5 to 12%, the leading edge of the blade is arcuate, and the trailing edge of the blade is a sharp airfoil shape.
[0010]
In the above configuration, the blade has a blade shape that is thicker than that of a thin blade having a constant thickness, and fluid separation is prevented.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
Example 1
The invention in Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing an operation state of an impeller in a mixed flow blower, FIG. 2 is a front view of the mixed flow blower, and FIG. 3 is a rotation locus diagram of the impeller in the mixed flow blower.
[0013]
Reference numeral 1 denotes a synthetic resin impeller of a mixed flow blower, in which a plurality of blades 2 having a constant thickness are integrally formed on the outer peripheral surface of a hub 3 having a substantially truncated cone shape. In the impeller 1, the hub 3 is fixed to the shaft of the motor 4, placed in an appropriate casing 5, and rotated by the motor 4 to perform a blowing action. As the impeller 2 rotates, most of the air flows from the front edge 6 of the blade 2 and flows out from the rear edge 7 to perform aerodynamic work as indicated by the arrows in FIG.
[0014]
As shown in FIG. 3, the vane 2 has a one-dot chain line AA (also referred to as a flow path center line AA) connecting the midpoint of the front edge 6 and the rear edge 7 of the vane on the rotation trajectory diagram. The front edge 6 with the vicinity as the boundary, the outer periphery 8 side (also referred to as the tip) from the vicinity of the middle point to a curved curve 6a with respect to the windward side, and the hub 3 side from the vicinity of the middle point to the windward side Each is formed on a convex curve 6b. In addition, the blade 2 has a curved locus 7b that protrudes from the vicinity of the midpoint to the windward side of the rear edge 7 from the vicinity of the midpoint, and the outer periphery 8 from the vicinity of the midpoint is linear on the rotation locus diagram. Each is formed in a substantially curved line 7a.
[0015]
In the above configuration, the front edge 6 of the blade 2 has a wing area near the hub 3 increased from the vicinity of its midpoint by making the hub 3 side a convex curve 6a with respect to the windward side. Since the hub 3 side is formed with a curved curve 7b with respect to the windward side from the vicinity of the middle point, the blade area near the hub 3 can be reduced as compared with the prior art. Therefore, the blade area in the vicinity of the hub 3 that does not contribute much to the aerodynamic work of the blower can be reduced, the frictional resistance of the blade can be reduced, and the fluid noise can be reduced. As a specific effect, a low noise effect of 1 dB (A) was obtained when an experiment was performed with the blower of the impeller 1 having an outer diameter Φ of 400 mm.
[0016]
The blade 2 is made of a synthetic resin and is a thin blade having a thickness of 2 to 3 mm. However, the blade 2 can be made of metal and can be made thinner.
[0017]
(Example 2)
The invention in Embodiment 2 of the present invention will be described with reference to FIG. FIG. 4 is a developed sectional view on the flow path center line AA of the impeller in the mixed flow blower. The invention of the second embodiment is different from the mixed flow blower of the first embodiment in which the ratio of the maximum thickness of the blades and the chord length is set in a specific range and the blades have a constant thickness. Since the effect is the same, only the differences will be described.
[0018]
As shown in FIG. 4, the blade 12 has a ratio t / c between the maximum thickness t and the chord length c in the cross-sectional development on the flow path center line AA connecting the midpoint of the front edge and the rear edge of the blade 12. The leading edge in the range of 5 to 12% is formed in a thick wing having an arcuate shape 12a and a wing-shaped shape 12b having a sharp trailing edge.
[0019]
In the above configuration, the leading edge of the thick wing having the ratio t / c of the maximum thickness t and the chord length c in the range of 5 to 12% is an arcuate shape 12a and the rear as compared with a thin wing having a constant thickness. Since the blade 12 has an airfoil shape 12b with a sharp edge, separation of fluid flow from the blade 12 is prevented, and further noise reduction can be achieved. However, the ratio t / c between the maximum thickness t of the blades and the chord length c starts to exhibit a low noise effect from 5%, and the low noise effect is saturated when the ratio t / c is 12%. By the way, when an experiment was conducted using an impeller of a mixed flow blower with an outer diameter Φ of 400 mm and a thick blade having a maximum blade thickness t to chord length ratio t / c of 9%, 2 dB (A ) Low noise effect was obtained.
[0020]
In the second embodiment, the ratio t / c between the maximum thickness t and the chord length c of the blade 12 is set in the range of 5 to 12%. Although it is in the cross-sectional development on the flow path center line AA connecting the midpoints, it is not always necessary to be on the flow path center line AA connecting the midpoint of the front edge of the blade 12 and the midpoint of the rear edge. Even if the line is slightly shifted left and right from the midpoint of the edge and the midpoint of the trailing edge, substantially the same effect can be expected. In addition, the inventions of the first and second embodiments are not limited to the mixed flow blower, and it is a matter of course that the same effect can be obtained even if the invention is applied to an impeller of an axial flow blower.
[0021]
【The invention's effect】
As is apparent from the above embodiment, the invention according to claim 1 includes a motor and an impeller driven by the motor, and the impeller is a thin blade having a constant thickness on the outer periphery of the hub. In the rotation trajectory diagram of this blade, the front edge of the blade has a concave curve from the vicinity of the midpoint of the front edge to the windward side, and from the vicinity of the midpoint. The hub side is formed into a convex curve with respect to the windward side, and the trailing edge of the blade is near the middle point of this trailing edge from the vicinity of the midpoint. The outer peripheral side is formed in a substantially curved line, and the blade area near the hub can be reduced to reduce the frictional resistance of the blade and reduce fluid noise.
[0022]
The invention according to claim 2 is a blade of a thick wing in the invention according to claim 1 , and further, claim 3 is on the flow path center line connecting the midpoint of the leading edge and the midpoint of the trailing edge. The ratio t / c between the maximum thickness t and the chord length c in the cross-sectional development is set in the range of 5 to 12%, the front edge of the blade has an arc shape, and the trailing edge of the blade has a sharp airfoil shape As compared with a thin wing having a constant thickness, fluid separation is prevented and noise can be further reduced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an operation state of an impeller of Example 1 in a mixed flow fan of the present invention. FIG. 2 is a front view of the mixed flow fan. FIG. 3 is a mixed flow fan. FIG. 4 is a developed sectional view of the impeller of Example 2 on the flow path center line AA in the mixed flow fan. FIG. 5 is a blade of a conventional mixed flow fan. Front view of the car [Fig. 6] Rotation locus diagram of the impeller [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Impeller 2 Blade 3 Hub 6 Front edge 6a Concave curve 7 Rear edge 7a Straight curved line 6b, 7b Convex curve 8 Outer periphery 12 Blade 12a Arc shape 12b Airfoil shape

Claims (3)

モータと、このモータに駆動される羽根車とを備え、前記羽根車はハブの外周に厚さ一定の薄翼の複数枚の羽根を有し、この羽根の回転軌跡図上において、羽根の前縁はこの前縁の中点付近より外周側を風上側に対して凹形状の曲線に、前記中点付近よりハブ側を風上側に対して凸形状の曲線にそれぞれ形成し、前記羽根の後縁はこの後縁の中点付近よりハブ側を風上側に対して凸形状の曲線に、前記中点付近より外周側は直線状をした略曲線にそれぞれ形成してなる斜流送風機。  A motor and an impeller driven by the motor, and the impeller has a plurality of thin blades having a constant thickness on the outer periphery of the hub. The edge is formed into a concave curve from the vicinity of the midpoint of the front edge toward the windward side, and the hub side from the vicinity of the midpoint is formed into a convex curve with respect to the windward side. A mixed-flow blower having an edge formed into a curved curve that protrudes from the vicinity of the midpoint of the rear edge toward the windward side on the hub side, and a substantially curved line that extends straight from the vicinity of the midpoint. モータと、このモータに駆動される羽根車とを備え、前記羽根車はハブの外周に厚翼の複数枚の羽根を有し、この羽根の回転軌跡図上において、羽根の前縁はこの前縁の中点付近より外周側を風上側に対して凹形状の曲線に、前記中点付近よりハブ側を風上側に対して凸形状の曲線にそれぞれ形成し、前記羽根の後縁はこの後縁の中点付近よりハブ側を風上側に対して凸形状の曲線に、前記中点付近より外周側は直線状をした略曲線にそれぞれ形成してなる斜流送風機。A motor and an impeller driven by the motor, and the impeller has a plurality of thick blades on the outer periphery of the hub. The outer peripheral side from the vicinity of the middle point of the edge is formed into a concave curve with respect to the windward side, and the hub side from the vicinity of the middle point is formed into a convex curve with respect to the windward side. A mixed-flow blower formed by forming a hub-side convex curve with respect to the windward side from the middle point of the edge and a substantially curved line having a straight line shape from the vicinity of the middle point. 羽根は、厚翼でその前縁の中点と後縁の中点を結ぶ流路中心線上の断面展開における羽根の最大厚みｔと弦長ｃの比ｔ／ｃを、５〜１２％の範囲に設定し、かつ羽根の前縁は円弧状をし、羽根の後縁は尖った翼型形状をした請求項２記載の斜流送風機。The blade is a thick blade, and the ratio t / c between the maximum thickness t of the blade and the chord length c in the cross-sectional development on the flow path center line connecting the midpoint of the leading edge and the midpoint of the trailing edge is in the range of 5 to 12%. The mixed flow blower according to claim 2, wherein the leading edge of the blade has an arc shape and the trailing edge of the blade has a sharp airfoil shape.
JP13529599A 1999-05-17 1999-05-17 Mixed flow fan Expired - Fee Related JP3855533B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102478020A (en) * 2010-11-24 2012-05-30 台达电子工业股份有限公司 Centrifugal fan and fan blade thereof

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CN1318765C (en) * 2003-12-15 2007-05-30 珠海格力电器股份有限公司 Impeller for fan, fan using impeller and air conditioner using fan
JP4802694B2 (en) * 2005-12-13 2011-10-26 パナソニック株式会社 Blower impeller and air conditioner
JP4967882B2 (en) * 2007-07-23 2012-07-04 パナソニック株式会社 Mixed flow blower impeller and air conditioner
JP4967883B2 (en) * 2007-07-23 2012-07-04 パナソニック株式会社 Mixed flow blower impeller and air conditioner
JP2012026402A (en) * 2010-07-27 2012-02-09 Panasonic Corp Mixed flow fan and air conditioner with the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102478020A (en) * 2010-11-24 2012-05-30 台达电子工业股份有限公司 Centrifugal fan and fan blade thereof
CN102478020B (en) * 2010-11-24 2015-06-03 台达电子工业股份有限公司 Centrifugal fan and fan blade thereof

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