JPS62186145A - Ventilation fan - Google Patents
Ventilation fanInfo
- Publication number
- JPS62186145A JPS62186145A JP61026426A JP2642686A JPS62186145A JP S62186145 A JPS62186145 A JP S62186145A JP 61026426 A JP61026426 A JP 61026426A JP 2642686 A JP2642686 A JP 2642686A JP S62186145 A JPS62186145 A JP S62186145A
- Authority
- JP
- Japan
- Prior art keywords
- impeller
- attack
- angle
- air flow
- static pressure
- 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.)
- Pending
Links
- 238000009423 ventilation Methods 0.000 title claims abstract description 12
- 230000003068 static effect Effects 0.000 abstract description 15
- 230000007423 decrease Effects 0.000 abstract description 5
- 238000004299 exfoliation Methods 0.000 abstract 2
- 230000002093 peripheral effect Effects 0.000 abstract 2
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
一般の室内換気用で軸流型羽根車の換気扇に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION This invention relates to an axial-flow impeller ventilation fan for indoor ventilation in general industrial applications.
従来の技術
従来、この種の換気扇は、屋外の風速が強い場合には屋
内へ吹き込もうとしばしば逆回転し、特に室内側前面に
パネルを付けた構造では、閉切静圧が著しく低下し、風
速4m/S 程度の外風でも逆転し外気が屋内に導入し
てくるので防止手段が要望されていた。Conventional technology Conventionally, this type of ventilation fan often rotates in the opposite direction to blow air indoors when the wind speed outside is strong, and the closing static pressure drops significantly, especially in structures with a panel attached to the front of the indoor side. Even outside wind with a wind speed of about 4 m/s can reverse the flow and bring outside air into the room, so there was a need for a means to prevent it.
このようなことから従来のパネル付換気扇では第4図に
示すように電動機1により駆動される羽根車2の外周に
位置するよう円筒部のない吸込ベルマウス4を本体フレ
ーム8にそれぞれ取付け、この羽根車2の吸込側に化粧
パネル3を設け、吹出側にはシャッタ7を吹出し気流に
より開くよう取付け、吸込ベルマウス4と化粧パネル3
の間に吸気口6を設けていた。これにより吸込気流の斜
流流れを作り閉切静圧を上昇させることにより、風速6
〜am/S程度までの外風であれば羽根車2を逆回転し
ないようにするものであった。For this reason, in the conventional ventilation fan with a panel, as shown in FIG. A decorative panel 3 is provided on the suction side of the impeller 2, and a shutter 7 is installed on the outlet side so as to be opened by the blown airflow.
An intake port 6 was provided between the two. This creates a diagonal flow of suction airflow and increases the closing static pressure, resulting in a wind speed of 6
The impeller 2 is prevented from rotating in the opposite direction if the outside wind is up to about am/s.
発明が解決しようとする問題点
上記従来の換気扇では、第6図に破線で示すように、静
圧−風量曲線が凸型となり、凸の頂点までは良いが凸の
頂点を超える外風圧がかかった場合、急に外気導入が始
まり、A点付近からB点付近へ、またその逆へと性能曲
線上を行ったり来たりするのでパサパサという耳障りな
異常音を発生するという問題があった。Problems to be Solved by the Invention In the conventional ventilation fan described above, the static pressure-air volume curve is convex, as shown by the broken line in FIG. In this case, the introduction of outside air suddenly starts and moves back and forth on the performance curve from near point A to near point B and vice versa, resulting in a problem of generating a dry and harsh abnormal sound.
本発明は上記従来の問題に留意し、不安定な静圧−風量
曲線を解消し異常音を防止するとともに、耐外風速の大
きい換気扇を提供することを目的とするものである。The present invention has been made in consideration of the above-mentioned conventional problems, and aims to provide a ventilation fan that eliminates the unstable static pressure-air volume curve, prevents abnormal noise, and has a high external wind speed.
問題点を解決するための手段
この問題点を解決するために本発明は、軸流型羽根車の
外周部に位置して設けられたベルマウスの吸込側に放射
状に、前記羽根車の旋回方向に傾斜した複数枚の案内羽
根を設けたものである。Means for Solving the Problem In order to solve this problem, the present invention provides a bell mouth provided at the outer periphery of an axial flow type impeller, which is arranged radially on the suction side of the bell mouth in the rotating direction of the impeller. It is equipped with a plurality of guide vanes that are slanted.
作 用
この構成により、吸込側より吸引された空気は、複数の
案内羽根によシ羽根車の回転方向に予旋回してから、羽
根車に入り、静圧風量曲線の安定化と、閉切静圧の上昇
をさせることとなる。Effect: With this configuration, the air sucked in from the suction side is pre-rotated in the direction of rotation of the impeller by multiple guide vanes, and then enters the impeller, stabilizing the static pressure air volume curve and This results in an increase in static pressure.
実施例
以下、本発明の一実施例を第1図〜第3図にもとづき説
明するが、従来例と同一箇所には同一番号を付し、詳細
な説明は省略する。図において、8は両面を開口した箱
形の本体フレームで、内部には電動機1に直結したハブ
2aの外周に放射状に複数枚の羽根ブレード2bを形成
した軸流型の羽根車2を有し、この羽根車2の外周に位
置して円筒部のない吸込ペルマウス4を設け、その吸込
側に放射状に、羽根車2の回転方向に内径側が曲折した
8枚の案内羽根9を等間隔に配設し、その先端部に化粧
パネル3を接して固定し、このとき吸込ベルマウス4と
化粧パネル3との間に吸込気流の通過に必要な間隔が得
られるよう案内羽根9の長さを定めである。7は本体フ
レーム8の吹出側に設けた気流により開放するシャッタ
である。EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. The same parts as in the conventional example are given the same numbers, and detailed explanation will be omitted. In the figure, reference numeral 8 denotes a box-shaped main frame with openings on both sides, and inside thereof is an axial-flow type impeller 2 in which a plurality of blades 2b are formed radially around the outer circumference of a hub 2a directly connected to the electric motor 1. A suction pel mouth 4 without a cylindrical portion is provided on the outer periphery of the impeller 2, and eight guide vanes 9 whose inner diameter side is bent in the rotational direction of the impeller 2 are arranged radially on the suction side at equal intervals. The decorative panel 3 is fixed in contact with the leading end of the guide vane 9, and the length of the guide vane 9 is determined so as to provide a space between the suction bell mouth 4 and the decorative panel 3 necessary for passage of the suction airflow. It is. A shutter 7 is provided on the outlet side of the main body frame 8 and is opened by the airflow.
上記構成において、電動機1によって羽根車2が回転す
ると、室内空気は化粧パネル3と吸込ペルマウス4との
間より吸引される。このとき吸込ペルマウス4には化粧
パネル3との間に、矢印1゜にて示す羽根車2の回転方
向に、内径側が曲折した複数の案内羽根9が付いている
ので、吸引された室内空気は上記羽根車2の回転方向に
予旋回して、上記羽根車2に流入する。そのため第3図
に示すように、同一風量でも羽根ブレード2bの回転方
向断面6への迎角(流入角WAと取付角βとのなす角)
αAは、予旋回がないときの迎角αBに比べて大きく減
少する。性能曲線の凸現象は、迎角αAが剥離迎角(1
oO〜120程度)に達していることと、羽根ブレード
2bのノ1プ2aから外周部全域で同時に剥離迎角に達
することにより発生する。予旋回をつけると一つには、
第3図のように迎角αAが減少し、剥離開始風量が減少
することと、今一つは上記羽根ブレード2bの外周部は
ど予旋回が大きく迎角αAが小さいので、剥離が全域で
同時には発生せず、したがって凸型性能曲線とはならず
、また閉切静圧が上昇する。In the above configuration, when the impeller 2 is rotated by the electric motor 1, indoor air is sucked from between the decorative panel 3 and the suction perme mouth 4. At this time, the suction permouth 4 is provided with a plurality of guide vanes 9, the inner diameter of which is bent in the rotational direction of the impeller 2, as indicated by the arrow 1°, between the suction panel 3 and the decorative panel 3, so that the suctioned indoor air is It pre-turns in the rotational direction of the impeller 2 and flows into the impeller 2. Therefore, as shown in Fig. 3, even with the same air volume, the angle of attack (angle formed by the inflow angle WA and the mounting angle β) to the rotation direction cross section 6 of the vane blade 2b.
αA is greatly reduced compared to the angle of attack αB when there is no pre-turn. The convexity of the performance curve is caused by the angle of attack αA being separated by the angle of attack (1
oO~120) and the separation angle of attack is simultaneously reached in the entire area from the knob 2a of the vane blade 2b to the outer periphery. One thing is to add a pre-turn.
As shown in Fig. 3, the angle of attack αA decreases and the amount of air at which separation starts decreases. Another reason is that the pre-swivel of the outer circumference of the vane blade 2b is large and the angle of attack αA is small, so separation does not occur simultaneously in the entire area. Therefore, there is no convex performance curve, and the closing static pressure increases.
第6図に従来例と本発明の静圧風量曲線の比較を示した
が、これによれば、凸型現象は解消され、閉切静圧はo
、86IIMAqから2.411ffA9へ、最大静圧
は、1.4ffA 〜2.4朋A9 へ、耐外風圧は
5.7m/Sから、7.6m/Sへ向上している。なお
静圧と耐外風速は次式の関係がある。静圧=1.2/1
9.6 Xo、7 X (風速)2但し、0.7は風圧
係数とする。Fig. 6 shows a comparison of the static pressure air volume curves of the conventional example and the present invention. According to this, the convex phenomenon is eliminated and the closing static pressure is o.
, 86IIMAq to 2.411ffA9, the maximum static pressure has improved from 1.4ffA to 2.4ffA9, and the external wind pressure resistance has improved from 5.7m/S to 7.6m/S. The relationship between static pressure and external wind speed is expressed by the following formula. Static pressure = 1.2/1
9.6 Xo, 7 X (wind speed) 2 However, 0.7 is the wind pressure coefficient.
発明の効果
以上のように本発明によれば、吸込気流は羽根車の回転
方向に予旋回してから羽根車に入るから、吸込側に抵抗
があっても静圧風景曲線が不安定形状とならないので異
常音もなく、かつ耐外風速は50%向上する効果が得ら
れる。Effects of the Invention As described above, according to the present invention, the suction airflow enters the impeller after pre-turning in the direction of rotation of the impeller, so even if there is resistance on the suction side, the static pressure landscape curve does not have an unstable shape. Therefore, there is no abnormal noise, and the external wind speed can be improved by 50%.
第1図は本発明の一実施例による換気扇を示す側断面図
、第2図は同換気扇を示す正面図、第3図は本発明と従
来例との迎角の比較図、第4図は従来の換気扇を示す側
断面図、第5図は本発明と従来例との性能曲線の比較図
である。
2・・・・・・羽根車、4・・・・・・吸込ペルマウス
、9・・・・・・案内羽根。
代理人の氏名 弁理士 中 尾 敏 男 ほか1名第1
図 パ−°”41
4−−− a、灸ν8へ゛ルフウス
第2図
第3図
第4図Fig. 1 is a side sectional view showing a ventilation fan according to an embodiment of the present invention, Fig. 2 is a front view showing the same ventilation fan, Fig. 3 is a comparison diagram of the angle of attack between the present invention and a conventional example, and Fig. 4 is a FIG. 5, a side sectional view showing a conventional ventilation fan, is a comparison diagram of performance curves of the present invention and a conventional example. 2... Impeller, 4... Suction pel mouth, 9... Guide vane. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure Par-°”41 4--- a, moxibustion ν8
Claims (1)
の吸込側に放射状に、前記羽根車の回転方向に傾斜した
複数枚の案内羽根を設けた換気扇。A ventilation fan including a plurality of guide vanes radially inclined in the rotational direction of the impeller on the suction side of a bell mouth provided on the outer periphery of an axial flow type impeller.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61026426A JPS62186145A (en) | 1986-02-07 | 1986-02-07 | Ventilation fan |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61026426A JPS62186145A (en) | 1986-02-07 | 1986-02-07 | Ventilation fan |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62186145A true JPS62186145A (en) | 1987-08-14 |
Family
ID=12193192
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61026426A Pending JPS62186145A (en) | 1986-02-07 | 1986-02-07 | Ventilation fan |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62186145A (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6430630A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Burner |
JPS6430642A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Catalyst for purifying exhaust gas |
JPS6430643A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Catalyst for purifying exhaust gas |
JPS6430648A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Nox decomposition catalyst |
JPS6430644A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Nox decomposition catalyst |
JPS6430645A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Nox decomposition catalyst |
JPS6430629A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Burner |
JPS6430628A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Burner |
JPS6430649A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Nox decomposition catalyst |
JPS6430647A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Catalyst for purifying exhaust gas |
JPS6430627A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Air filter |
JPS6430631A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Burner |
JPH0317300U (en) * | 1989-07-04 | 1991-02-20 | ||
JPH04123388U (en) * | 1991-04-26 | 1992-11-09 | 三菱重工業株式会社 | pump suction bell |
KR20150065500A (en) * | 2013-12-05 | 2015-06-15 | 엘지전자 주식회사 | Outdoor unit of air conditioner |
-
1986
- 1986-02-07 JP JP61026426A patent/JPS62186145A/en active Pending
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6430630A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Burner |
JPS6430642A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Catalyst for purifying exhaust gas |
JPS6430643A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Catalyst for purifying exhaust gas |
JPS6430648A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Nox decomposition catalyst |
JPS6430644A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Nox decomposition catalyst |
JPS6430645A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Nox decomposition catalyst |
JPS6430629A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Burner |
JPS6430628A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Burner |
JPS6430649A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Nox decomposition catalyst |
JPS6430647A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Catalyst for purifying exhaust gas |
JPS6430627A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Air filter |
JPS6430631A (en) * | 1987-07-24 | 1989-02-01 | Matsushita Electric Ind Co Ltd | Burner |
JPH0317300U (en) * | 1989-07-04 | 1991-02-20 | ||
JPH04123388U (en) * | 1991-04-26 | 1992-11-09 | 三菱重工業株式会社 | pump suction bell |
KR20150065500A (en) * | 2013-12-05 | 2015-06-15 | 엘지전자 주식회사 | Outdoor unit of air conditioner |
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