JPH07247991A - Diagonal flow fan - Google Patents
Diagonal flow fanInfo
- Publication number
- JPH07247991A JPH07247991A JP3502294A JP3502294A JPH07247991A JP H07247991 A JPH07247991 A JP H07247991A JP 3502294 A JP3502294 A JP 3502294A JP 3502294 A JP3502294 A JP 3502294A JP H07247991 A JPH07247991 A JP H07247991A
- Authority
- JP
- Japan
- Prior art keywords
- casing
- return guide
- guide vane
- mixed flow
- flow 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、天井裏やトンネル内等
に設置されて空調用ブースタや換気等に使用される小形
の斜流ファンに係り、特に静音化と空力性能の向上のた
めの改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized mixed flow fan installed in a ceiling or in a tunnel and used for an air conditioner booster, ventilation, etc., and particularly for reducing noise and improving aerodynamic performance. Regarding improvement.
【０００２】[0002]
【従来の技術】従来の斜流ファンは、特開昭６１−１３
８８９９号公報に記載されているように、リターンガイ
ドベーンの前縁は、軸方向において回転軸と直角である
ので半径方向には同一の軸方向位置にあり、また、前縁
を正面から見ると羽根車の羽根の後縁と同一の放射線上
にある。2. Description of the Related Art A conventional mixed flow fan is disclosed in Japanese Patent Laid-Open No. 61-13 / 1986.
As described in Japanese Patent No. 8899, the leading edge of the return guide vane is at the same axial position in the radial direction because it is perpendicular to the rotation axis in the axial direction, and when the leading edge is viewed from the front. It is on the same radiation as the trailing edge of the impeller blades.
【０００３】[0003]
【発明が解決しようとする課題】このような従来の斜流
ファンでは、羽根車の羽根の後縁で大きく発達した気流
の境界層や剥離が、羽根の後縁から非一様な流跡（ウェ
ーク）となって下流のリターンガイドベーンに流入する
ので、リターンガイドベーンの前縁ではウェークによっ
て気流の乱れが発生し、大きな騒音を発生する。この気
流の乱れの発生状態は、リターンガイドベーンの前縁で
は羽根の後縁からのウェークが半径方向には同時に、ま
た時間的には回転と同期して脈動的に流入するために、
該リターンガイドベーンの前縁で新たな乱れとなって発
生するもので、大きな騒音の原因となっている。更に、
これら前縁での気流の乱れにより、流体損失が大きくな
り、空力性能が低いという欠点が発生する。In such a conventional mixed-flow fan, the boundary layer and separation of the air flow, which is greatly developed at the trailing edge of the impeller blade, is not uniform from the trailing edge of the blade ( As a wake) and flows into the downstream return guide vane, the wake causes turbulence of the air flow at the leading edge of the return guide vane, which causes large noise. This turbulence of the air flow is caused by the wake from the trailing edge of the blades flowing in the leading edge of the return guide vane at the same time in the radial direction and pulsatingly in synchronization with the rotation in terms of time.
This is a new turbulence generated at the front edge of the return guide vane, which causes a large noise. Furthermore,
The turbulence of the airflow at the leading edge causes a large fluid loss, resulting in poor aerodynamic performance.
【０００４】本発明の目的は、このような気流の乱れを
低減し、騒音を大幅に低減すると共に空力性能を大幅に
向上することにある。An object of the present invention is to reduce such turbulence of the air flow, significantly reduce noise, and significantly improve aerodynamic performance.
【０００５】[0005]
【課題を解決するための手段】本発明は、上流側に円錐
形の斜流羽根車と、該羽根車の下流に設置されたリター
ンガイドベーンを備えた斜流ファンにおいて、前記リタ
ーンガイドベーンの前縁を前記斜流羽根車の羽根の後縁
よりも大きく反回転方向側へ傾斜させたことを特徴と
し、具体的には、前記リターンガイドベーンの前縁の外
周側をケーシングの上流側に張り出させたことを特徴と
し、あるいは、前記リターンガイドベーンの前縁を半径
方向位置の増大に伴って上流側に張り出した逆円錐形態
としたことを特徴とする。According to the present invention, there is provided a mixed flow fan having a conical mixed flow impeller on an upstream side and a return guide vane installed on the downstream side of the impeller. The front edge is inclined to the counter-rotational direction side more largely than the trailing edge of the blade of the mixed flow impeller. Specifically, the outer peripheral side of the front edge of the return guide vane is set to the upstream side of the casing. It is characterized in that the front edge of the return guide vane is formed into an inverted conical shape that is projected to the upstream side as the position in the radial direction increases.
【０００６】また、上流側に向けて円錐台状のハブ部と
該ハブ部の表面に設けられた羽根とを有する斜流羽根車
と、該羽根車の外周を覆う円錐筒状の上流側ケ−シング
と、前記斜流羽根車と上流側ケ−シングによって形成さ
れた風路の下流に設置された下流側ケ−シングと内筒に
よって形成された逆円錐筒形の風路に設けられたリター
ンガイドベーンを備えた斜流ファンにおいて、前記リタ
ーンガイドベーンの前縁を前記斜流羽根車の羽根の後縁
よりも大きく反回転方向側へ傾斜させたことを特徴と
し、具体的には、前記上流側ケ−シングと下流側ケ−シ
ングは同一形状に成形されたものを向きを変えて使用し
たものであることを特徴とし、または、前記上流側ケ−
シングと下流側ケ−シングは同一形状に成形されたもの
を向きを変えて接合し、前記リターンガイドベーンの前
縁の外周側は前記両ケーシングの接合位置よりも上流側
まで張り出させたことを特徴とし、更には、前記リター
ンガイドベーンの張り出し部の外周縁の一部は上流側ケ
−シングの内面に当接するようにしたことを特徴とす
る。Also, a mixed flow impeller having a truncated cone-shaped hub portion toward the upstream side and blades provided on the surface of the hub portion, and a conical cylindrical upstream side casing covering the outer periphery of the impeller. A reverse conical cylindrical air passage formed by the inner casing and a downstream casing installed downstream of the air passage formed by the mixed flow impeller and the upstream casing. In a mixed flow fan provided with a return guide vane, a front edge of the return guide vane is inclined to a counter-rotation direction side more than a trailing edge of a blade of the mixed flow impeller, and specifically, The upstream casing and the downstream casing are characterized in that they are molded in the same shape and are used in different directions, or the upstream casing is used.
The single casing and the downstream casing are formed in the same shape and are joined by changing the direction, and the outer peripheral side of the front edge of the return guide vane is projected to the upstream side of the joint position of the both casings. Further, a part of the outer peripheral edge of the projecting portion of the return guide vane is brought into contact with the inner surface of the upstream casing.
【０００７】[0007]
【作用】リターンガイドベーンの前縁が羽根車の羽根の
後縁よりも大きく反回転方向に傾いているので、羽根の
後縁からのウェークがリターンガイドベーンの前縁の半
径方向の全領域に同時に流入することがなく、全前縁で
の単位時間当りの騒音発生量が大幅に小さくなる。ま
た、リターンガイドベーンの前縁の半径方向全領域での
気流の乱れの発生が時間的に分散するので、相乗効果に
よりリターンガイドベーンの前縁での気流の乱れの発生
量が小さくなり、騒音が大幅に低減する。[Operation] Since the leading edge of the return guide vane is tilted in the counter-rotation direction more largely than the trailing edge of the impeller blade, the wake from the trailing edge of the vane is spread over the entire radial area of the leading edge of the return guide vane. Since they do not flow in at the same time, the amount of noise generated per unit time at all leading edges is significantly reduced. In addition, the occurrence of airflow turbulence in the entire radial area of the leading edge of the return guide vane is dispersed over time, so the synergistic effect reduces the amount of airflow turbulence generated at the leading edge of the return guide vane, reducing noise. Is greatly reduced.
【０００８】そして、これらリターンガイドベーンの前
縁での気流の乱れの発生量が低減して流体損失も低下す
るので、斜流ファンの空力性能と全圧効率が向上する。Since the amount of turbulence of the air flow generated at the leading edge of these return guide vanes is reduced and the fluid loss is also reduced, the aerodynamic performance and total pressure efficiency of the mixed flow fan are improved.
【０００９】また、半径方向位置の増大に伴って上流側
に張り出したリターンガイドベーンの前縁は、羽根の後
縁で外周部分の大きな回転方向の流速成分のエネルギ
（動圧）を早期に静圧に変換できるので斜流ファンの空
力性能を向上することができ、更に、羽根の後縁からの
ウェークのリターンガイドベーン前縁への流入を非同期
化して騒音を低減することができる。Further, the leading edge of the return guide vane which projects to the upstream side with the increase of the radial position is the trailing edge of the blade, and the energy (dynamic pressure) of the flow velocity component in the large rotation direction of the outer peripheral portion is quickly eliminated. Since the pressure can be converted into pressure, the aerodynamic performance of the mixed flow fan can be improved, and further, the inflow of the wake from the trailing edge of the blade to the leading edge of the return guide vane can be made asynchronous to reduce noise.
【００１０】更にまた、同一形状の上流側ケ−シングと
下流側ケ−シングは共通の金型を用いて成形（プレス加
工）することができるので、ケ−シング製造コストを低
減する。Furthermore, since the upstream casing and the downstream casing having the same shape can be molded (pressed) using a common mold, the manufacturing cost of the casing is reduced.
【００１１】[0011]
【実施例】以下、図面を用いて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.
【００１２】図１及び図２は本発明になる斜流ファンの
一実施例を示しており、図１は該斜流ファンの縦断側面
図、図２は図１のＸ−Ｘ断面図（縦断正面図）である。1 and 2 show an embodiment of a mixed flow fan according to the present invention. FIG. 1 is a vertical sectional side view of the mixed flow fan, and FIG. 2 is a sectional view taken along line X--X of FIG. It is a front view).
【００１３】図１及び図２に示す斜流ファンは、上流側
に向けて円錐台状のハブ部１の円錐外周面に複数の羽根
２が反回転方向に傾斜して設けられた斜流羽根車３と、
この斜流羽根車３の外周を覆う円錐筒状の上流側ケ−シ
ング４と、その上流側端縁が前記ハブ部１の後端縁と同
一外径で該後端縁に対向し、下流側に向けて円錐筒状の
内筒５と、その上流側端縁が前記上流側ケ−シング４の
後端縁と同一内径で該後端縁に対向し、下流側に向けて
円錐筒状の下流側ケ−シング６と、前記内筒５と下流側
ケ−シング６の間に形成された逆円錐筒形の風路に前記
羽根２の後縁よりも大きく反回転方向に傾斜して設置さ
れた複数のリターンガイドベーン７と、前記斜流羽根車
３を駆動する駆動モータ８を備える。The mixed flow fan shown in FIGS. 1 and 2 is a mixed flow fan in which a plurality of blades 2 are provided in a conical outer peripheral surface of a truncated cone-shaped hub portion 1 toward the upstream side in a counter-rotational direction. Car 3
A conical cylindrical upstream side casing 4 that covers the outer periphery of the mixed flow impeller 3 and its upstream end edge has the same outer diameter as the rear end edge of the hub portion 1, faces the rear end edge, and is located downstream. The inner cylinder 5 having a conical cylindrical shape toward the side, the upstream end edge thereof has the same inner diameter as the rear end edge of the upstream casing 4 and faces the rear end edge, and the conical cylindrical shape faces the downstream side. Of the downstream casing 6 and an air flow path of an inverted conical tubular shape formed between the inner casing 5 and the downstream casing 6 with a larger inclination than the trailing edge of the blade 2 in the counter-rotational direction. A plurality of return guide vanes 7 installed and a drive motor 8 for driving the mixed flow impeller 3 are provided.
【００１４】前記上流側ケ−シング４と下流側ケ−シン
グ６は、共通の金型によって同一形状にプレス加工され
たもので、向きを変えて接合して連結フランジ４ａ，６
ａを螺子結合することにより連結される。また、前記リ
ターンガイドベーン７は、内筒５の外周面と下流側ケ−
シング６の内周面にその内外周縁を溶接により結合さ
れ、前記駆動モータ８は支持片９によって内筒５に支持
される。そして、この斜流ファンは前記連結フランジ４
ａ，６ａに形成した取り付け孔を利用して設置される。The upstream casing 4 and the downstream casing 6 are pressed into the same shape by a common mold, and are joined by changing their directions.
They are connected by screwing a together. The return guide vane 7 is connected to the outer peripheral surface of the inner cylinder 5 and the downstream case.
The inner and outer peripheral edges of the inner surface of the sing 6 are joined by welding, and the drive motor 8 is supported by the inner cylinder 5 by a support piece 9. And, this mixed flow fan has the connection flange 4
It is installed using the mounting holes formed in a and 6a.
【００１５】このように構成された斜流ファンは、斜流
羽根車３が駆動モータ８に駆動されて回転すると、空気
はこの斜流羽根車３に吸い込まれて矢印１０ａ〜１０ｄ
のように流れる。In the mixed-flow fan thus constructed, when the mixed-flow impeller 3 is driven by the drive motor 8 to rotate, air is sucked into the mixed-flow impeller 3 and the arrows 10a to 10d are drawn.
Flows like.
【００１６】この実施例における斜流ファンの斜流羽根
車３に設けられた羽根２の後縁２ａとリターンガイドベ
ーン７の前縁７ａの反回転方向の傾斜の関係は、図２に
示すように、羽根２の後縁２ａに対してリターンガイド
ベーン７の前縁７ａは反回転方向に更に多く傾斜してい
る。内筒５とリターンガイドベーン７の前縁７ａの接合
点Ａと該前縁７ａの外周側の反回転方向最後端点Ｂの間
の傾斜部の円周方向長さをＳ2としたとき、この円周方
向長Ｓ2の値を、内筒５と下流側ケ−シング７の間の半
径方向長さｌとの比で、Ｓ2／ｌが１．１〜２．２とな
るようにすると、該リターンガイドベーン７の前縁７ａ
での気流の乱れの発生量が小さくなり、騒音低減の効果
が大きい。また、この円周方向長Ｓ2の値を斜流羽根車
３の羽根２の形状との関係で特定すると、図２におい
て、ボス部１と羽根２の後縁２ａの接合点Ａと該後縁２
ａの反回転方向の最後部点Ｃとの間の傾斜部の円周方向
長さをＳ1としたとき、比率Ｓ2／Ｓ1が１．１〜２．０
の範囲で良好な騒音低減効果が得られ、Ｓ2がＳ1より大
きくなるようにリターンガイドベーン７の前縁を反回転
方向側に羽根２の後縁２ａよりも強く傾斜させると、静
音化に大きな効果が得られた。The relationship between the trailing edge 2a of the blade 2 provided on the mixed flow impeller 3 of the mixed flow fan and the leading edge 7a of the return guide vane 7 in the counter-rotational direction in this embodiment is as shown in FIG. In addition, the front edge 7a of the return guide vane 7 is further inclined in the counter-rotational direction with respect to the rear edge 2a of the blade 2. When the circumferential length of the inclined portion between the junction point A of the inner cylinder 5 and the front edge 7a of the return guide vane 7 and the rearmost end point B in the counter-rotation direction on the outer peripheral side of the front edge 7a is S 2 , When the value of the circumferential length S 2 is set to a ratio of the radial length 1 between the inner cylinder 5 and the downstream casing 7 so that S 2 / l is 1.1 to 2.2. , The front edge 7a of the return guide vane 7
The amount of turbulence of the air flow is reduced, and the effect of noise reduction is great. Further, when the value of the circumferential direction length S 2 is specified in relation to the shape of the blade 2 of the mixed flow impeller 3, the joint point A between the boss portion 1 and the trailing edge 2a of the blade 2 and the rear end of the blade 2 in FIG. Edge 2
When the circumferential length of the inclined portion between the rearmost point C of the counter-rotation direction of a set to S 1, the ratio S 2 / S 1 is 1.1 to 2.0
In this range, a good noise reduction effect can be obtained, and when the front edge of the return guide vane 7 is tilted in the counter-rotational direction side more strongly than the rear edge 2a of the blade 2 so that S 2 becomes larger than S 1 , noise is reduced. The great effect was obtained.
【００１７】図３は、図２における羽根２が反回転方向
にずれた位置にある状態を示したもので、該羽根２の後
縁２ａとリターンガイドベーン７の前縁７ａとの相対関
係を示している。リターンガイドベーン７の前縁７ａは
羽根２の後縁２ａに対し、Ｄ点で交差してＸ形となるよ
うに傾斜している。なお、この傾斜角度の差は、５度〜
２０度が好適であった。FIG. 3 shows the state in which the blade 2 in FIG. 2 is displaced in the counter-rotational direction, and shows the relative relationship between the trailing edge 2a of the blade 2 and the leading edge 7a of the return guide vane 7. Shows. The leading edge 7a of the return guide vane 7 is inclined so as to intersect with the trailing edge 2a of the blade 2 at the point D to form an X shape. The difference in the inclination angle is 5 degrees or more.
20 degrees was preferred.
【００１８】このようにリターンガイドベーン７の前縁
７ａでの気流の乱れが低減すると空力性能も向上する。
この実施例では、Ｓ2／ｌが１．７５となるように設定
して良好な効果が得られた。As described above, when the turbulence of the air flow at the front edge 7a of the return guide vane 7 is reduced, the aerodynamic performance is also improved.
In this example, S 2 / l was set to 1.75 to obtain a good effect.
【００１９】この実施例において、リターンガイドベー
ン７の前縁７ａの外周側直径と内周側直径は、斜流羽根
車３の羽根２の後縁２ａの外周側直径と内周側直径とほ
ぼ同じ寸法にしている。リターンガイドベーン７の前縁
７ａを所定の寸法にするために、例えば、羽根２の後縁
２ａからリターンガイドベーン７の前縁７ａまでを径方
向に広げた場合には流路拡大による流体損失が生じ、ま
た、両ケーシング４，６が相応して大型化するが、この
実施例のように羽根２の後縁２ａの外周側直径とリター
ンガイドベーン７の前縁７ａの外周側直径とをほぼ同じ
寸法にすることにより、流体損失を最小限に抑えること
ができると共に両ケーシング４，６を小型化できる。In this embodiment, the outer diameter and the inner diameter of the front edge 7a of the return guide vane 7 are substantially the same as the outer diameter and the inner diameter of the trailing edge 2a of the blade 2 of the mixed flow impeller 3. They have the same dimensions. In order to make the leading edge 7a of the return guide vane 7 a predetermined size, for example, when the trailing edge 2a of the blade 2 to the leading edge 7a of the return guide vane 7 is expanded in the radial direction, fluid loss due to expansion of the flow path is caused. In addition, both casings 4 and 6 are correspondingly enlarged, but the outer diameter of the trailing edge 2a of the blade 2 and the outer diameter of the leading edge 7a of the return guide vane 7 are set to be the same as in this embodiment. By making the dimensions substantially the same, the fluid loss can be minimized and the casings 4 and 6 can be downsized.
【００２０】図４は、本発明になる斜流ファンの他の実
施例の縦断側面図である。この実施例は、前記実施例に
更に改良を加えたもので、リターンガイドベーン７の前
縁７ａが半径方向位置の増大に伴って軸方向に上流側へ
張り出し、その一部が両ケ−シング４，６の接合位置よ
りも上流側まで突出してその外周縁が上流側ケ−シング
４の内面に嵌合して当接状態となる逆円錐形態となって
いる。前縁７ａが逆円錐形態に張り出したリターンガイ
ドベーン７は、羽根２の後縁２ａで外周部分の大きな回
転方向流速成分のエネルギ（動圧）を早期に静圧に変換
するように作用し、斜流ファンの空力性能を大幅に向上
させ。また、羽根２の後縁２ａからのウェークのリター
ンガイドベーン７の前縁７ａへの流入を非同期化するこ
とができ、騒音低減にも貢献する。FIG. 4 is a vertical sectional side view of another embodiment of the mixed flow fan according to the present invention. This embodiment is a modification of the above embodiment, in which the front edge 7a of the return guide vane 7 projects axially toward the upstream side as the position in the radial direction increases, and a part of both cases is formed. It has an inverted conical shape in which the outer peripheral edge of each of the protrusions 4 and 6 projects further upstream than the joining position and is fitted into the inner surface of the upstream casing 4 to be in contact with it. The return guide vane 7 with the leading edge 7a protruding in an inverted conical shape acts on the trailing edge 2a of the blade 2 so as to convert the energy (dynamic pressure) of the large rotational direction flow velocity component of the outer peripheral portion into static pressure at an early stage. Greatly improves the aerodynamic performance of mixed flow fans. Further, the inflow of the wake from the trailing edge 2a of the blade 2 into the leading edge 7a of the return guide vane 7 can be made asynchronous, which also contributes to noise reduction.
【００２１】図４に示す実施例において、リターンガイ
ドベーン７の前縁７ａの外周側点Ｆと両ケーシング４，
６の接合点Ｅの間の上流側長さをａ、下流側ケーシング
６の最大直径部と内筒５の間の半径方向長さをｌとした
とき、ａ／ｌが０．１３〜０．５０になるようにリター
ンガイドベーン７の前縁７ａの外周側点Ｆを設定して該
リターンガイドベーン７を上流側ケ−シング４内まで侵
入させるようにすると、両ケーシング４，６の軸方向寸
法を従来と同じ小型の寸法に抑えた状態で良好な騒音低
減及び空力性能の向上が得られる。この実施例では、ａ
／ｌが０．２５となるように設定している。In the embodiment shown in FIG. 4, a point F on the outer peripheral side of the front edge 7a of the return guide vane 7 and both casings 4,
6 is a and the radial length between the maximum diameter portion of the downstream casing 6 and the inner cylinder 5 is l, a / l is 0.13 to 0. When the outer peripheral side point F of the front edge 7a of the return guide vane 7 is set so as to be 50, and the return guide vane 7 is allowed to enter the upstream side casing 4, the axial direction of both casings 4, 6 Good noise reduction and improved aerodynamic performance can be obtained while keeping the dimensions as small as the conventional ones. In this embodiment, a
/ L is set to be 0.25.
【００２２】図２〜図４に例示したように、リターンガ
イドベーン７の形状を、前縁７ａの前記円周方向長Ｓ2
が羽根２の後縁２ａの円周向長Ｓ1よりも大きくなるよ
うに大きく傾斜させ、また、該リターンガイドベーン７
の前縁７ａを半径方向位置の増大に伴って軸方向上流側
に張り出させた逆円錐形態とすることにより、従来の斜
流ファンに比べて、騒音を約７ｄＢ低減し、また、空力
性能を１５％向上させることができた。As illustrated in FIGS. 2 to 4, the shape of the return guide vane 7 is defined by the circumferential length S 2 of the front edge 7a.
Is inclined so as to be larger than the circumferential length S 1 of the trailing edge 2a of the blade 2, and the return guide vane 7
The front edge 7a of the No. 3 has an inverted conical shape that is projected to the upstream side in the axial direction as the position in the radial direction increases, so that noise is reduced by about 7 dB compared with a conventional mixed flow fan, and aerodynamic performance is reduced. Could be improved by 15%.
【００２３】[0023]
【発明の効果】本発明は、リターンガイドベーンの前縁
が羽根車の羽根の後縁よりも大きく反回転方向に傾けて
羽根の後縁からのウェークがリターンガイドベーンの前
縁の半径方向の全領域に同時に流入することがないよう
にしたので、該前縁での気流の乱れが低減して騒音発生
量が大幅に低減すると共に流体損失が小さくなって空力
性能が向上する効果が得られる。According to the present invention, the leading edge of the return guide vane is tilted in the counter-rotational direction to a greater extent than the trailing edge of the blade of the impeller, and the wake from the trailing edge of the blade is in the radial direction of the leading edge of the return guide vane. Since it does not flow into all the areas at the same time, the turbulence of the air flow at the leading edge is reduced, the amount of noise generated is greatly reduced, and the fluid loss is reduced and the aerodynamic performance is improved. .
【００２４】また、半径方向位置の増大に伴って上流側
に張り出したリターンガイドベーンの前縁は、羽根の後
縁で外周部分の大きな回転方向の流速成分のエネルギ
（動圧）を早期に静圧に変換できるので斜流ファンの空
力性能を向上することができ、更に、羽根の後縁からの
ウェークのリターンガイドベーン前縁への流入を非同期
化して騒音が低減する効果が得られる。Further, the leading edge of the return guide vane, which is projected to the upstream side with the increase of the radial position, is the trailing edge of the blade, and the energy (dynamic pressure) of the flow velocity component in the large rotational direction of the outer peripheral portion is quickly eliminated. Since the pressure can be converted into pressure, the aerodynamic performance of the mixed flow fan can be improved, and further, the effect of asynchronizing the inflow of the wake from the trailing edge of the blade to the leading edge of the return guide vane and reducing noise can be obtained.
【００２５】更にまた、同一形状の上流側ケ−シングと
下流側ケ−シングは共通の金型を用いて成形（プレス加
工）することができるので、ケ−シング製造コストを低
減することができる効果が得られる。Furthermore, since the upstream casing and the downstream casing having the same shape can be molded (pressed) using a common mold, the manufacturing cost of the casing can be reduced. The effect is obtained.
【図１】本発明になる斜流ファンの一実施例を示す縦断
側面図である。FIG. 1 is a vertical sectional side view showing an embodiment of a mixed flow fan according to the present invention.
【図２】図１におけるＸ−Ｘ断面図である。FIG. 2 is a sectional view taken along line XX in FIG.
【図３】図２に示したリターンガイドベーンと羽根の相
対関係の別の状態を示した正面図である。FIG. 3 is a front view showing another state of the relative relationship between the return guide vanes and the blades shown in FIG.
【図４】本発明になる斜流ファンの他の実施例を示す縦
断側面図である。FIG. 4 is a vertical cross-sectional side view showing another embodiment of the mixed flow fan according to the present invention.
１…ボス部、２…羽根、２ａ…後縁、３…斜流羽根車、
４…上流側ケーシング、５…内筒、６…下流側ケーシン
グ、７…リターンガイドベーン、７ａ…前縁、８…駆動
モータ。1 ... Boss part, 2 ... Blade, 2a ... Trailing edge, 3 ... Mixed flow impeller,
4 ... upstream side casing, 5 ... inner cylinder, 6 ... downstream side casing, 7 ... return guide vane, 7a ... leading edge, 8 ... drive motor.
Claims (7)
根車の下流に設置されたリターンガイドベーンを備えた
斜流ファンにおいて、 前記リターンガイドベーンの前縁を前記斜流羽根車の羽
根の後縁よりも大きく反回転方向側へ傾斜させたことを
特徴とする斜流ファン。1. A mixed flow fan comprising a conical mixed flow impeller on an upstream side and a return guide vane installed downstream of the mixed flow impeller, wherein a leading edge of the return guide vane is the mixed flow fan. A mixed-flow fan characterized by being inclined toward the counter-rotational direction side more largely than the trailing edges of the impeller blades.
ーンの前縁の外周側をケーシングの上流側に張り出した
ことを特徴とする斜流ファン。2. The mixed flow fan according to claim 1, wherein the outer peripheral side of the front edge of the return guide vane is extended to the upstream side of the casing.
ーンの前縁を半径方向位置の増大に伴って上流側に張り
出した逆円錐形態としたことを特徴とする斜流ファン。3. The mixed flow fan according to claim 1, wherein a front edge of the return guide vane has an inverted conical shape protruding toward the upstream side as the position in the radial direction increases.
部の表面に設けられた羽根とを有する斜流羽根車と、該
羽根車の外周を覆う円錐筒状の上流側ケ−シングと、前
記斜流羽根車と上流側ケ−シングによって形成された風
路の下流に設置された下流側ケ−シングと内筒によって
形成された逆円錐筒形の風路に設けられたリターンガイ
ドベーンを備えた斜流ファンにおいて、 前記リターンガイドベーンの前縁を前記斜流羽根車の羽
根の後縁よりも大きく反回転方向側へ傾斜させたことを
特徴とする斜流ファン。4. A mixed flow impeller having a truncated cone-shaped hub portion toward the upstream side and blades provided on the surface of the hub portion, and a conical cylindrical upstream side casing covering the outer periphery of the impeller. A reverse conical cylindrical air passage formed by the inner casing and a downstream casing installed downstream of the air passage formed by the mixed flow impeller and the upstream casing. A mixed flow fan provided with a return guide vane, wherein a front edge of the return guide vane is inclined to a counter-rotation direction side more than a trailing edge of a blade of the mixed flow impeller.
と下流側ケ−シングは同一形状に成形されたものを向き
を変えて使用したものであることを特徴とする斜流ファ
ン。5. The mixed flow fan according to claim 4, wherein the upstream casing and the downstream casing are molded in the same shape and used in different directions.
と下流側ケ−シングは同一形状に成形されたものを向き
を変えて接合され、前記リターンガイドベーンの前縁の
外周側は前記両ケーシングの接合位置よりも上流側まで
張り出したことを特徴とする斜流ファン。6. The upstream casing and the downstream casing formed by the same shape are turned and joined together, and the outer peripheral side of the front edge of the return guide vane is formed as described above. A mixed-flow fan characterized in that it extends beyond the joining position of both casings to the upstream side.
ーンの張り出し部の外周縁の一部は上流側ケ−シングの
内面に当接することを特徴とする斜流ファン。7. The mixed flow fan according to claim 6, wherein a part of an outer peripheral edge of the projecting portion of the return guide vane abuts on an inner surface of the upstream casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3502294A JP2921384B2 (en) | 1994-03-04 | 1994-03-04 | Mixed flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3502294A JP2921384B2 (en) | 1994-03-04 | 1994-03-04 | Mixed flow fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07247991A true JPH07247991A (en) | 1995-09-26 |
| JP2921384B2 JP2921384B2 (en) | 1999-07-19 |
Family
ID=12430440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3502294A Expired - Fee Related JP2921384B2 (en) | 1994-03-04 | 1994-03-04 | Mixed flow fan |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2921384B2 (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101134094B1 (en) * | 2009-07-02 | 2012-04-19 | 주식회사 하이옥스 | Jetfan |
| JP2013050113A (en) * | 2009-03-04 | 2013-03-14 | Dyson Technology Ltd | Fan |
| US8894354B2 (en) | 2010-09-07 | 2014-11-25 | Dyson Technology Limited | Fan |
| US9328739B2 (en) | 2012-01-19 | 2016-05-03 | Dyson Technology Limited | Fan |
| US9568021B2 (en) | 2012-05-16 | 2017-02-14 | Dyson Technology Limited | Fan |
| US9568006B2 (en) | 2012-05-16 | 2017-02-14 | Dyson Technology Limited | Fan |
| US9732763B2 (en) | 2012-07-11 | 2017-08-15 | Dyson Technology Limited | Fan assembly |
| US9745996B2 (en) | 2010-12-02 | 2017-08-29 | Dyson Technology Limited | Fan |
| US9797414B2 (en) | 2013-07-09 | 2017-10-24 | Dyson Technology Limited | Fan assembly |
| US10006657B2 (en) | 2009-03-04 | 2018-06-26 | Dyson Technology Limited | Fan assembly |
| US10221860B2 (en) | 2009-03-04 | 2019-03-05 | Dyson Technology Limited | Fan assembly |
| US10428837B2 (en) | 2012-05-16 | 2019-10-01 | Dyson Technology Limited | Fan |
| JP2020005434A (en) * | 2018-06-29 | 2020-01-09 | 株式会社日立製作所 | Electric motor provided with inner fan |
-
1994
- 1994-03-04 JP JP3502294A patent/JP2921384B2/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013050113A (en) * | 2009-03-04 | 2013-03-14 | Dyson Technology Ltd | Fan |
| US10006657B2 (en) | 2009-03-04 | 2018-06-26 | Dyson Technology Limited | Fan assembly |
| US10221860B2 (en) | 2009-03-04 | 2019-03-05 | Dyson Technology Limited | Fan assembly |
| KR101134094B1 (en) * | 2009-07-02 | 2012-04-19 | 주식회사 하이옥스 | Jetfan |
| US8894354B2 (en) | 2010-09-07 | 2014-11-25 | Dyson Technology Limited | Fan |
| US9745988B2 (en) | 2010-09-07 | 2017-08-29 | Dyson Technology Limited | Fan |
| US9745996B2 (en) | 2010-12-02 | 2017-08-29 | Dyson Technology Limited | Fan |
| US9328739B2 (en) | 2012-01-19 | 2016-05-03 | Dyson Technology Limited | Fan |
| US10309420B2 (en) | 2012-05-16 | 2019-06-04 | Dyson Technology Limited | Fan |
| US9568021B2 (en) | 2012-05-16 | 2017-02-14 | Dyson Technology Limited | Fan |
| US9568006B2 (en) | 2012-05-16 | 2017-02-14 | Dyson Technology Limited | Fan |
| US10428837B2 (en) | 2012-05-16 | 2019-10-01 | Dyson Technology Limited | Fan |
| US9732763B2 (en) | 2012-07-11 | 2017-08-15 | Dyson Technology Limited | Fan assembly |
| US9797414B2 (en) | 2013-07-09 | 2017-10-24 | Dyson Technology Limited | Fan assembly |
| JP2020005434A (en) * | 2018-06-29 | 2020-01-09 | 株式会社日立製作所 | Electric motor provided with inner fan |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2921384B2 (en) | 1999-07-19 |
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