JPH0551799B2 - - Google Patents
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- Publication number
- JPH0551799B2 JPH0551799B2 JP62287828A JP28782887A JPH0551799B2 JP H0551799 B2 JPH0551799 B2 JP H0551799B2 JP 62287828 A JP62287828 A JP 62287828A JP 28782887 A JP28782887 A JP 28782887A JP H0551799 B2 JPH0551799 B2 JP H0551799B2
- Authority
- JP
- Japan
- Prior art keywords
- blade
- leading edge
- flat plate
- flow fan
- fan
- 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
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- Structures Of Non-Positive Displacement Pumps (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、斜流フアンに関するものである。[Detailed description of the invention] Industrial applications The present invention relates to a mixed flow fan.
従来の技術
近年、斜流フアンは、空調、暖房機器の送風
用、電子機器の冷却用、換気扇など種々の製品に
広く利用されているが、その反面、これらの主要
な騒音源となつている。これらの製品は生活空間
に密着した場所で使用されることが多く、また、
最近の近隣騒音の問題からも、低騒音化が強く要
望されている。BACKGROUND TECHNOLOGY In recent years, mixed flow fans have been widely used in various products such as air conditioning, heating equipment, cooling electronic equipment, ventilation fans, etc. However, on the other hand, they have become a major source of noise in these products. . These products are often used in places that are closely connected to living spaces, and
Due to recent problems with nearby noise, there is a strong demand for lower noise levels.
以下図面を参照しながら上述した従来のフアン
の一例について説明する。 An example of the conventional fan mentioned above will be described below with reference to the drawings.
従来、簡易ガイドを有するプロペラフアンは第
５図および第６図に示すように、円筒状のハブ１
の外周部に複数枚の羽根２が取付けられてなる羽
根車３とこの羽根車３の外周に吸込部４と吐出部
５とを仕切るように配置された平板状のガイド６
とを備えてなるものである。 Conventionally, a propeller fan having a simple guide has a cylindrical hub 1, as shown in FIGS. 5 and 6.
An impeller 3 has a plurality of blades 2 attached to the outer periphery of the impeller 3, and a flat guide 6 arranged on the outer periphery of the impeller 3 to partition the suction section 4 and the discharge section 5.
It is equipped with the following.
一般にこの種のフアンは、ブレード面に回転方
向へ前傾角θをつけることにより、ブレードと周
囲の抵抗物との脈動的な干渉により増大するnz
音（周波数ｆが回転数ｎとブレード枚数ｚの積で
表わされる回転騒音）及びその高周波成分を減衰
させることが大きな効果と考えられる。 In general, this type of fan has a forward tilt angle θ in the direction of rotation on the blade surface, which increases the nz due to pulsating interference between the blade and surrounding resistance objects.
It is considered that a major effect is to attenuate sound (rotational noise whose frequency f is represented by the product of the number of rotations n and the number of blades z) and its high frequency components.
発明が解決しようとする問題点
しかし、羽根面を回転方向に前傾させると下記
のような問題点が生じる。Problems to be Solved by the Invention However, when the blade surface is tilted forward in the direction of rotation, the following problems occur.
羽根車の基本性能を決める重要諸元として羽根
の入口角、出口角や、翼弦長などがあげられる。
そこで目標性能に満足する基本翼面形状が第７図
に示すように決まつたと仮定する。ここで、仮に
θが騒音を低減する最適な前傾角とすると第７図
の翼面をθだけ前傾させて第８図に示す形状に設
計できる。ここで半径方向にある線B′−B′を通
る断面の側面形状を比較すると第９図に示す如
く、第８図のものが吹出方向に傾斜した形状にな
り、この傾斜は前傾角により決まるが、半径方向
の流れに影響を与えるため、羽根車の基本性能を
変えてしまう、これを防ぐために修正を加える必
要があるが、このことは羽根車の設計を非常に複
雑にし、基本性能、前傾角を最適に選択すること
を著しく妨げていた。 Important specifications that determine the basic performance of an impeller include the inlet and outlet angles of the blades, and the chord length.
Therefore, it is assumed that the basic wing surface shape that satisfies the target performance has been determined as shown in FIG. Here, if θ is the optimal forward inclination angle for reducing noise, the wing surface shown in FIG. 7 can be designed into the shape shown in FIG. 8 by inclining forward by θ. If we compare the side shapes of the cross section passing through line B'-B' in the radial direction, as shown in Figure 9, the one in Figure 8 has a shape inclined in the blowing direction, and this inclination is determined by the forward inclination angle. However, since it affects the flow in the radial direction, it changes the basic performance of the impeller.It is necessary to make modifications to prevent this, but this makes the design of the impeller very complicated and changes the basic performance, This significantly hindered the optimal selection of the anteversion angle.
そこで、上記問題点を解決する１つの案とし
て、第１０図に示すように、円錐台形状のハブ部
１の周壁面上に斜流加速を生ぜしめる複数枚の羽
根２を植設してなる斜流フアンにおいて羽根前縁
部３の先端に三角形なる板５をとりつけることが
考えられる。 Therefore, as one plan to solve the above problem, as shown in FIG. 10, a plurality of blades 2 that generate diagonal flow acceleration are planted on the peripheral wall surface of a truncated conical hub portion 1. It is conceivable to attach a triangular plate 5 to the tip of the blade leading edge 3 in a mixed flow fan.
これによつて、基本性能を妨げることなく、単
純に設計し、かつnz音（周波数ｆが回転数ｎと
ブレード枚数ｚの積で表わされる回転騒音）が減
衰できるであろう。 This will enable a simple design and attenuate nz sound (rotational noise whose frequency f is the product of the number of rotations n and the number of blades z) without interfering with basic performance.
しかしながら、このようなフアンにあつては、
空気が高速で流れる際に生じる三角形平板付近で
の剥離によつて、高周波騒音が発生する場合もあ
るという不具合が存していた。 However, for such fans,
There was a problem in that high-frequency noise could be generated due to separation near the triangular flat plate that occurs when air flows at high speed.
そこで、本発明の目的は、ブレードが高速回転
することにより発生する高周波騒音を低減するこ
とにある。 SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reduce high-frequency noise generated by high-speed rotation of blades.
問題点を解決するための手段
そこで、上記問題点を解決するために本発明の
斜流フアンは、羽根前縁部の先端に密着した、三
角形なる平板の一辺以外の二辺に対して、端面部
分にわん曲部をほどこしたものである。Means for Solving the Problems Therefore, in order to solve the above problems, the mixed flow fan of the present invention has two sides other than one side of a triangular flat plate that is in close contact with the tip of the leading edge of the blade. It has a curved part.
作 用
本発明は、上記した構成によつて、フアンに吸
い込まれる空気の流れは、三角形平板の端面部に
衝突する際、そこがわん曲状に削られているため
に、流れのはくりが起こりにくく、翼面に沿つた
状態で流れるようになる。Effects According to the present invention, with the above-described configuration, when the air flow sucked into the fan collides with the end face of the triangular flat plate, the end face of the triangular plate is cut into a curved shape, so that the flow is not cut off. This is less likely to occur and will flow along the wing surface.
実施例
以下、本発明の一実施例の斜流フアンについ
て、図面を参照しながら説明する。Embodiment Hereinafter, a mixed flow fan according to an embodiment of the present invention will be described with reference to the drawings.
第１図は、本発明の第一の実施例における斜流
フアンを示すものである。 FIG. 1 shows a mixed flow fan in a first embodiment of the present invention.
図中１は円錐台状のハブ部、２はハブ部１の外
周部に取付けられている羽根、３は羽根前縁部、
４は羽根後縁部、５は三角形の平板、６は回転方
向を示す矢印であり、第２図は三角形平板の各辺
におけるわん曲部R1，R2を示した断面図である。 In the figure, 1 is a truncated conical hub, 2 is a blade attached to the outer periphery of the hub 1, 3 is a front edge of the blade,
4 is a blade rear edge, 5 is a triangular flat plate, and 6 is an arrow indicating the direction of rotation. FIG. 2 is a sectional view showing curved portions R 1 and R 2 on each side of the triangular flat plate.
以上のように本実施例によれば、羽根前縁部に
密着した、三角形なる平板の一辺以外の二辺それ
ぞれに対して、端面部分をわん曲部にすることに
よつて、三角形平板の端面部に衝突する吸込み空
気の流れが、そこで、はくりを起こさず、高周波
騒音を低減することができる。 As described above, according to this embodiment, the end face of the triangular flat plate is curved by making each of the two sides other than the one side of the triangular flat plate in close contact with the leading edge of the blade. The flow of suction air that impinges on the part can be prevented from exploding there and reduce high-frequency noise.
以下本発明の第２の実施例について図面を参照
しながら説明する。 A second embodiment of the present invention will be described below with reference to the drawings.
第３図は、本発明の第２の実施例における斜流
フアンを示すものであり、同図においては、第１
図の構成と同様なものである。 FIG. 3 shows a mixed flow fan in a second embodiment of the present invention, and in the same figure, the first
The configuration is similar to that shown in the figure.
第１図と異なるのは、わん曲部R1，R2を三角
形平板５の端面部にだけにほどこすのではなく、
羽根前縁３、羽根外周先端７、羽根後縁部４と、
全体に広げた点である。 The difference from FIG. 1 is that the curved portions R 1 and R 2 are not provided only on the end face of the triangular flat plate 5,
A blade leading edge 3, a blade outer peripheral tip 7, a blade trailing edge 4,
This is a point that has been expanded throughout.
上記第２実施例にすれば、軸流方向と周方向か
ら吸い込む空気の流れに対して、流れのはくりに
関する問題がさらに緩和され、又、後縁部４に関
しても、空気の吹き出し時による、流れのはくり
も防止でき、これらのことによつて、第一の実施
例よりも、さらに高周波騒音を低減することが可
能となる。 According to the second embodiment, the problem of flow separation can be further alleviated with respect to the air flow sucked in from the axial direction and the circumferential direction, and also regarding the trailing edge 4, the problems caused by air blowing out can be further alleviated. It is also possible to prevent flow separation, and as a result, it is possible to further reduce high-frequency noise than in the first embodiment.
発明の効果
以上のように本発明は、羽根前縁部の先端に密
着させた三角形なる平板の一辺以外の二辺それぞ
れに対して、端面部にわん曲部をほどこすことに
より、三角形平板部での空気の流れのはくり状態
をおこりにくくし、翼面に沿つた流れを促進さ
せ、はくりや渦流による高周波騒音を低減するこ
とができる。Effects of the Invention As described above, the present invention provides a triangular flat plate by forming a curved portion on the end face of each of the two sides other than one side of the triangular flat plate that is brought into close contact with the tip of the leading edge of the blade. This makes it possible to reduce the likelihood of air flow separation, promote flow along the blade surface, and reduce high-frequency noise caused by separation and vortices.
第１図は本発明の第１の実施例における斜流フ
アンの要部平面図、第２図は第１図のＡ−Ａ線に
よる断面図、第３図は本発明の第２の実施例にお
ける斜流フアンの要部平面図、第４図ａ，ｂ，
ｃ，ｄは第３図のＡ−Ａ線、Ｂ−Ｂ線、Ｃ−Ｃ
線、Ｄ−Ｄ線による断面図、第５図および第６図
はプロペラフアンの従来例を示す縦断面図および
背面図、第７図は従来の斜流フアンの要部平面
図、第８図は第７図において前傾角θをもつた斜
流フアンの要部平面図、第９図は、第７図、第８
図のＢ−Ｂ線、B′−B′線による断面図、第１０
図は従来例に対する一つの解決案説明図、第１１
図は第１０図のA′−A′線による断面図である。
１……ハブ部、２……羽根、３……羽根前縁
部、４……羽根後縁部、５……三角形平板、６…
…回転方向、R1，R2……わん曲部。
FIG. 1 is a plan view of essential parts of a mixed flow fan according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a diagram showing a second embodiment of the present invention. A plan view of the main parts of the mixed flow fan in Fig. 4a, b,
c, d are line A-A, line B-B, and C-C in Figure 3.
5 and 6 are vertical sectional views and rear views showing conventional examples of propeller fans. FIG. 7 is a plan view of essential parts of a conventional mixed flow fan, and FIG. 8 7 is a plan view of the main part of the mixed flow fan with forward inclination angle θ, and FIG.
Cross-sectional view taken along line B-B and line B'-B' in the figure, No. 10
The figure is an explanatory diagram of one solution to the conventional example, No. 11
The figure is a sectional view taken along line A'-A' in FIG. DESCRIPTION OF SYMBOLS 1...Hub part, 2...Blade, 3...Blade leading edge part, 4...Blade trailing edge part, 5...Triangular flat plate, 6...
...Rotation direction, R 1 , R 2 ...Curved section.
Claims (1)
ハブ部の周囲に配設された複数枚の羽根とを備
え、回転軸方向からみた羽根前縁の形状がほぼ直
線的である斜流フアンの各羽根前縁に、厚みが羽
根厚とほぼ同一でかつ三角形をした平板を、前縁
から回転方向に外挿するように一体成形し、前記
平板の一辺がほぼフアンの外径円周に沿い、他の
一辺は、羽根前縁の外周寄りに密着させた斜流フ
アンにおいて、羽根前縁に密着した前記三角形平
板の一辺以外の二辺に対して端面部分にわん曲部
をほどこした斜流フアン。1. A mixed flow fan that is equipped with a hub part for receiving power from the outside and a plurality of blades arranged around the hub part, and the leading edge of the blades has a substantially straight shape when viewed from the direction of the rotation axis. A triangular flat plate with approximately the same thickness as the blade thickness is integrally formed on the leading edge of each blade so as to be extrapolated from the leading edge in the rotational direction, and one side of the flat plate is approximately along the outer circumference of the fan. , the other side is a diagonal flow fan in which the blade is in close contact with the outer periphery of the leading edge of the blade, and a curved portion is formed on the end face of two sides other than the one side of the triangular flat plate that is in close contact with the blade leading edge. Juan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62287828A JPH01130098A (en) | 1987-11-13 | 1987-11-13 | Mixed flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62287828A JPH01130098A (en) | 1987-11-13 | 1987-11-13 | Mixed flow fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01130098A JPH01130098A (en) | 1989-05-23 |
| JPH0551799B2 true JPH0551799B2 (en) | 1993-08-03 |
Family
ID=17722288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62287828A Granted JPH01130098A (en) | 1987-11-13 | 1987-11-13 | Mixed flow fan |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01130098A (en) |
-
1987
- 1987-11-13 JP JP62287828A patent/JPH01130098A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01130098A (en) | 1989-05-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |