JPH074390A - Centrifugal blower - Google Patents

Centrifugal blower

Info

Publication number
JPH074390A
JPH074390A JP14345493A JP14345493A JPH074390A JP H074390 A JPH074390 A JP H074390A JP 14345493 A JP14345493 A JP 14345493A JP 14345493 A JP14345493 A JP 14345493A JP H074390 A JPH074390 A JP H074390A
Authority
JP
Japan
Prior art keywords
impeller
vanes
main plate
centrifugal blower
uniform
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
Application number
JP14345493A
Other languages
Japanese (ja)
Inventor
Souzou Suzuki
創三 鈴木
Takumi Kida
琢己 木田
Akihiro Yabushita
明弘 藪下
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 Holdings Corp
Original Assignee
Matsushita Refrigeration Co
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
Application filed by Matsushita Refrigeration Co filed Critical Matsushita Refrigeration Co
Priority to JP14345493A priority Critical patent/JPH074390A/en
Publication of JPH074390A publication Critical patent/JPH074390A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To provide a centrifugal blower used for an air conditioner or the like enabling the center-of-gravity position of an impeller to coincide with a rotational center position without fitting a balance weight or the like for adjusting the center-of-gravity position in addition to reducing the frequency expressed by the product of the number of blades and the rotational frequency of the impeller and the noise of the higher harmonic components. CONSTITUTION:An impeller is formed of plural blades 9, a main plate 10 with the blades 9 fixed thereto, and a side plate fixed to the anti-main plate side end face of the blade 9. The blades 9 are installed at equal spaces apart. The main plate 10 is provided with plural motor cooling air holes 12, and the motor cooling air holes are disposed at nonuniform spaces apart.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、空気調和機などに用い
られる低騒音化を図った遠心送風機に関するものであ
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal blower which is used in an air conditioner or the like and has reduced noise.

【0002】[0002]

【従来の技術】従来より、遠心送風機は、空気調和機な
どの送風機として幅広く使用されており、近年は特に送
風機の低騒音化に対する要請が非常に強くなっている。
2. Description of the Related Art Conventionally, centrifugal blowers have been widely used as blowers such as air conditioners, and in recent years, there has been a particularly strong demand for noise reduction of blowers.

【0003】以下、図面を参照しながら、特開平1−1
55098号公報などで提案されている従来の遠心送風
機について説明する。
Hereinafter, with reference to the drawings, Japanese Patent Laid-Open No. 1-1
A conventional centrifugal blower proposed in Japanese Patent No. 55098 will be described.

【0004】図7は従来の遠心送風機の構造を示すもの
である。図7において1は羽根車であり、複数の羽根板
2と、前記羽根板2を固定した主板3と、前記羽根板2
の反主板側端面に固定した側板4より構成されている。
5は羽根車1に直結したモ−タであり、羽根車1とモ−
タ5を収納するケーシング6に固定されている。7はケ
ーシング6に設けた吸込口である。
FIG. 7 shows the structure of a conventional centrifugal blower. In FIG. 7, reference numeral 1 denotes an impeller, a plurality of vanes 2, a main plate 3 to which the vanes 2 are fixed, and the vanes 2
It is composed of a side plate 4 fixed to the end surface on the side opposite to the main plate.
A motor 5 is directly connected to the impeller 1 and is connected to the impeller 1.
It is fixed to a casing 6 that houses the data 5. Reference numeral 7 is a suction port provided in the casing 6.

【0005】図8は図7の遠心送風機における前記羽根
車1の回転軸に直交するA−A線断面を示したものであ
る。又、θ1,θ2,θ3,θ4は主板3の回転軸芯P
を中心として羽根板2を主板3に一定の取付角αで配置
させた各羽根板2間の設置角度を示すものでありそれぞ
れ不均一な角度に設定されている。
FIG. 8 shows a cross section taken along the line AA perpendicular to the rotation axis of the impeller 1 in the centrifugal blower shown in FIG. Further, θ1, θ2, θ3, and θ4 are rotation axis cores P of the main plate 3.
The center shows the installation angle between the vane plates 2 in which the vane plate 2 is arranged on the main plate 3 at a constant attachment angle α, and they are set to non-uniform angles.

【0006】以上のように構成された遠心送風機につい
て、以下その動作について説明する。
The operation of the centrifugal blower configured as described above will be described below.

【0007】まず、モ−タ5の駆動力によって羽根車1
が回転すると、吸込口7を介して空気が羽根車1内に導
入され、複数の羽根板2間を通過する際に静圧と動圧を
付加され羽根車1からケーシング6内に吐出される。そ
の後、ケーシング6内で動圧の一部は静圧に変換されて
ケーシング6外に吐出され送風作用を為す。
First, the impeller 1 is driven by the driving force of the motor 5.
When is rotated, air is introduced into the impeller 1 through the suction port 7, static pressure and dynamic pressure are added when passing between the plurality of blade plates 2, and the air is discharged from the impeller 1 into the casing 6. . After that, a part of the dynamic pressure in the casing 6 is converted into static pressure and is discharged to the outside of the casing 6 to perform an air blowing action.

【0008】このとき、遠心送風機運転時に発生する特
有の騒音、すなわち羽根板2の枚数Zと羽根車1の回転
周波数Nの積で表される周波数とその高調波成分の騒音
(以下NZ音と言う)が発生する。このNZ音低減の手
段として、図8の設置角度θ1,θ2,θ3,θ4を異
ならせることによる低騒音化手段が取られている。
At this time, the noise peculiar to the centrifugal blower during operation, that is, the frequency represented by the product of the number Z of blades 2 and the rotation frequency N of the impeller 1 and its harmonic component noise (hereinafter referred to as NZ noise) Say) occurs. As a means for reducing the NZ noise, a noise reducing means by changing the installation angles θ1, θ2, θ3, θ4 in FIG. 8 is adopted.

【0009】これにより、ある空間位置に対する各羽根
板2の出現周期が連続的に変化することにより、NZ音
は特定周波数をピークとして一定範囲内に分散した状態
で発生する。従って、NZ音の高調波成分も分散して発
生することになり、各次数のNZ音がひとつの周波数に
集中して発生するのを防止し、NZ音の音圧レベルを低
減している。
As a result, the appearance period of each vane plate 2 with respect to a certain spatial position continuously changes, so that the NZ sound is generated in a state of being dispersed within a certain range with a specific frequency as a peak. Therefore, the harmonic components of the NZ sound are also generated in a dispersed manner, the NZ sounds of each order are prevented from being concentrated and generated in one frequency, and the sound pressure level of the NZ sound is reduced.

【0010】[0010]

【発明が解決しようとする課題】しかしながら上記のよ
うな構成では、個々の羽根板2の隣接間隔が異なるた
め、羽根車1全体の重心位置が羽根車1の回転中心外に
位置し、この重心に作用する遠心力によってモ−タ5の
回転軸にアンバランス振動を生じる。そこでこのアンバ
ランス振動を除去するためには、羽根板2の後縁や主板
3の外周に調整用のバランスウェイト等を取付けて、羽
根車の重心位置を回転中心に一致させる面倒な調整作業
が必要となるという欠点があった。また、NZ音を効果
的に低減するためには羽根間隔の差を大きくする必要が
あり、羽根間隔の最も大きい部分や最も小さい部分では
最適な羽根間隔に対するズレが大きくなり羽根間の流れ
が乱れ乱流騒音が増加し、騒音値が増加するという欠点
があった。
However, in the above-mentioned configuration, since the distance between adjacent blade plates 2 is different, the center of gravity of the entire impeller 1 is located outside the center of rotation of the impeller 1, and the center of gravity is An unbalanced vibration is generated on the rotating shaft of the motor 5 due to the centrifugal force acting on. Therefore, in order to remove this unbalanced vibration, a troublesome adjustment work is performed in which a balance weight for adjustment is attached to the trailing edge of the blade plate 2 or the outer periphery of the main plate 3 to match the center of gravity of the impeller with the center of rotation. There was a drawback that it was necessary. Further, in order to effectively reduce the NZ sound, it is necessary to increase the difference between the blade intervals, and the deviation between the optimal blade intervals becomes large in the part where the blade interval is the largest and the part where the blade interval is the smallest, and the flow between the blades is disturbed. There is a drawback that the turbulent noise increases and the noise value increases.

【0011】本発明は上記課題に鑑み、乱流騒音を増加
させることなくNZ音を低減し、しかも重心位置調整用
のバランスウェイト等を取り付けることなくアンバラン
ス振動を防止することのできる遠心送風機を提供するも
のである。
In view of the above problems, the present invention provides a centrifugal blower capable of reducing NZ noise without increasing turbulent noise and preventing unbalanced vibration without attaching a balance weight or the like for adjusting the center of gravity. It is provided.

【0012】[0012]

【課題を解決するための手段】上記課題を解決するため
に本発明の遠心送風機は、複数の羽根板と、前記羽根板
を固定した主板と、前記羽根板の反主板側端面に固定し
た側板とで羽根車を構成し、前記羽根板は互いに等間隔
に設置し、かつ前記主板に複数のモ−タ冷却用通気穴を
設け、前記モ−タ冷却用通気穴を不均一な間隔に配設し
た構成を備えるものである。
In order to solve the above-mentioned problems, a centrifugal blower according to the present invention comprises a plurality of vanes, a main plate to which the vanes are fixed, and a side plate fixed to the end face of the vanes opposite to the main plate. To form an impeller, the vanes are installed at equal intervals, and the main plate is provided with a plurality of motor cooling vent holes, and the motor cooling vent holes are arranged at non-uniform intervals. It is provided with the configured structure.

【0013】また他の発明は、複数の羽根板と、前記羽
根板を固定した主板と、前記羽根板の反主板側端面に固
定した側板とで羽根車を構成し、前記羽根板は互いに等
間隔に設置し、かつ前記主板に複数のモ−タ冷却用通気
穴を設け、前記各モ−タ冷却用通気穴の面積を不均一に
設定した構成を備えるものである。
According to another aspect of the invention, a plurality of vanes, a main plate to which the vanes are fixed, and a side plate fixed to an end face of the vanes opposite to the main plate constitute an impeller, and the vanes are equal to each other. The main plate is provided with a plurality of vent holes for cooling the motor, and the vent holes for cooling the motor are set to have non-uniform areas.

【0014】さらに他の発明は、複数の羽根板と、前記
羽根板を固定した主板と、前記羽根板の反主板側端面に
固定した側板とで羽根車を構成し、前記羽根板は互いに
等間隔に設置し、かつ吸込口に複数の気流偏向板を設
け、前記気流偏向板の気流偏向角度を不均一に設定した
構成を備えるものである。
In still another aspect of the invention, a plurality of vanes, a main plate to which the vanes are fixed, and a side plate fixed to an end face of the vanes opposite to the main plate constitute an impeller, and the vanes are equal to each other. It is provided with a configuration in which the air flow deflecting plates are installed at intervals, a plurality of air flow deflecting plates are provided in the suction port, and the air flow deflecting angles of the air flow deflecting plates are set to be non-uniform.

【0015】[0015]

【作用】本発明では、吸込口から吸い込まれた流入気流
は羽根板に流入するまでのあいだにモータ冷却用通気穴
から噴出する還流の影響で気流角度が偏向される。モ−
タ冷却用通気穴は不均一な間隔に配設してあるため、流
入気流の偏向角度は不均一となり、等間隔に設定した羽
根板に流入する吸い込み流れは、各羽根板に対して不均
一になる。各羽根板間の流れ分布が異なるため、各羽根
板周りに形成される圧力分布も不均一となる。従って、
羽根車外のある空間位置に対して各羽根板から伝達され
る圧力の変動周期が変化することにより、NZ音は分散
した状態で発生し、NZ音の高調波成分も分散状に発生
することになり、NZ音の音圧レベルは低下する。ま
た、羽根板は等間隔に設定しているため乱流騒音の増加
はなく、かつ機械的には等バランスに近い状態であり回
転時に振動を発生することがない。
In the present invention, the inflow air flow sucked from the suction port is deflected by the influence of the recirculation flow ejected from the motor cooling vent hole before flowing into the vane plate. Mode
Since the cooling air vents are arranged at non-uniform intervals, the deflection angle of the incoming air flow is non-uniform, and the suction flow flowing into the vanes set at equal intervals is non-uniform for each vane. become. Since the flow distributions between the vane plates are different, the pressure distribution formed around each vane plate is also non-uniform. Therefore,
By changing the fluctuation cycle of the pressure transmitted from each vane plate to a certain spatial position outside the impeller, the NZ sound is generated in a dispersed state, and the harmonic components of the NZ sound are also generated in a dispersed manner. Therefore, the sound pressure level of the NZ sound decreases. Further, since the vane plates are set at equal intervals, turbulent flow noise does not increase, and mechanically they are in a state close to equibalance, so that vibration does not occur during rotation.

【0016】また、各モ−タ冷却用通気穴を不均一な面
積に設定することにより、各モ−タ冷却用通気穴から噴
出する還流流れの流速および流量は不均一となり流入気
流の偏向角度は不均一となり、等間隔に設定した羽根板
に流入する流れは不均一となり、各羽根板間の流れ分布
が異なりNZ音の音圧レベルは低下する。また、モ−タ
冷却用通気穴を不均一な面積に設定することにより各通
気穴の間隔を一定以上に保っても流入気流を異なる偏向
角にすることができ、特定の通気穴に応力が集中するこ
となく安定した機械強度を保つことができる。
Further, by setting the air holes for cooling the respective motors to have non-uniform areas, the flow velocity and flow rate of the reflux flow ejected from the air holes for cooling the respective motors become non-uniform, and the deflection angle of the inflow air flow is made. Becomes non-uniform, and the flow flowing into the vanes set at equal intervals becomes non-uniform, the flow distribution between the vanes differs, and the sound pressure level of the NZ sound decreases. In addition, by setting the ventilation holes for motor cooling to have non-uniform areas, it is possible to make the deflection angles of the inflow airflow different even if the intervals between the ventilation holes are kept at a certain value or more, and stress is exerted on specific ventilation holes. Stable mechanical strength can be maintained without concentration.

【0017】さらに、吸込口に設けた複数の気流偏向板
の気流偏向角度を不均一に設定することにより、流入気
流の偏向角度は不均一となり、等間隔に設定した各羽根
板間の流れ分布は不均一となり、NZ音の音圧レベルは
低下する。また、気流偏向板により羽根板への流入気流
角度を反回転方向へ制御することにより羽根車内部の圧
力は上昇し、送風能力が増加する。
Further, by setting the air flow deflection angles of the plurality of air flow deflection plates provided at the suction port to be non-uniform, the deflection angle of the inflow air flow becomes non-uniform, and the flow distribution between the vane plates set at equal intervals. Becomes non-uniform and the sound pressure level of the NZ sound decreases. Further, by controlling the inflow airflow angle to the vane plate in the counter-rotational direction by the airflow deflecting plate, the pressure inside the impeller rises and the air blowing capacity increases.

【0018】[0018]

【実施例】以下、本発明の一実施例について、図面を参
照しながら説明する。尚、従来例と同一部分については
重複を避けるため、同一の符号を付けて説明を省略す
る。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In order to avoid duplication, the same parts as those of the conventional example will be denoted by the same reference numerals and the description thereof will be omitted.

【0019】図1は、本発明の一実施例における遠心送
風機の構造を示すものである。図において8は羽根車で
あり、複数の羽根板9と、前記羽根板9を固定した主板
10と、前記羽根板9の反主板側端面に固定した側板1
1によって構成されている。図2は図1の遠心送風機に
おける前記羽根車8の回転軸に直交するB−B線断面を
示したものである。前記主板10にはモ−タの回転軸を
中心とした同心円上にγ1,γ2,γ3,γ4という不
等間隔にモ−タ冷却用通風穴12が設けてある。
FIG. 1 shows the structure of a centrifugal blower according to an embodiment of the present invention. In the figure, reference numeral 8 denotes an impeller, which includes a plurality of vane plates 9, a main plate 10 to which the vane plates 9 are fixed, and a side plate 1 fixed to an end face of the vane plate 9 opposite to the main plate side.
It is composed of 1. FIG. 2 is a cross-sectional view taken along line BB of the centrifugal blower shown in FIG. 1, which is orthogonal to the rotation axis of the impeller 8. The main plate 10 is provided with ventilation holes 12 for cooling the motor, which are concentric circles centering on the rotation axis of the motor and are arranged at unequal intervals γ1, γ2, γ3, γ4.

【0020】以上のように構成された遠心送風機につい
て、以下その動作について説明する。
The operation of the centrifugal blower configured as above will be described below.

【0021】まず、モ−タ5の駆動力によって羽根車8
が回転すると、吸込口7を介して空気が羽根車8内に導
入され、羽根板9間を通過する際に静圧と動圧を付加さ
れ羽根車8からケーシング6内に吐出される。その後、
ケーシング6内で動圧の一部は静圧に変換されてケーシ
ング6外に吐出され送風作用を為す。
First, the impeller 8 is driven by the driving force of the motor 5.
When is rotated, air is introduced into the impeller 8 through the suction port 7, static pressure and dynamic pressure are added when passing between the blade plates 9, and the air is discharged from the impeller 8 into the casing 6. afterwards,
A part of the dynamic pressure in the casing 6 is converted into a static pressure and is discharged to the outside of the casing 6 to perform an air blowing action.

【0022】このとき、モ−タ5周りの空気はモータ冷
却用通風穴12から羽根車8内へ吸引されモ−タを冷却
するが、この還流した気流は吸込口7から羽根板9に向
かって流入する気流を反回転方向に偏向させる。また、
モ−タ冷却用通風穴12は不等間隔に設置してあるため
流入気流の偏向角度は不均一な分布となり、等間隔に設
定した各羽根板9に流入する気流分布も不均一になる。
そこで、各羽根板9間の気流分布が異なるため各羽根板
9周りに形成される圧力分布も不均一となる。従って、
羽根車8外のある空間位置に対して各羽根板から伝幡す
る圧力変動の変動周期は図3に示すようにT1、T2、
T3、T4という不等周期で変化することになり、羽根
板9の枚数Zと羽根車8の回転周波数Nの積で表される
NZ音は、特定周波数をピークとして分散した状態で発
生する。従って、NZ音の高調波成分も分散状に発生す
ることになり、各騒音が特定の周波数に集中して発生す
ることはなく、ピーク音のレベルを抑制する。また、複
数の羽根板9は等間隔に設定しているため羽根板の間隔
は適正値に設定可能となり乱流騒音が増加することはな
く、かつ羽根車8の回転バランスは機械的には等バラン
スに近い状態であり回転時に振動を発生することがな
い。
At this time, the air around the motor 5 is sucked into the impeller 8 from the motor cooling ventilation hole 12 to cool the motor, and the recirculated airflow is directed from the suction port 7 to the blade plate 9. The incoming airflow is deflected in the anti-rotation direction. Also,
Since the motor cooling ventilation holes 12 are installed at unequal intervals, the deflection angle of the inflowing air flow becomes non-uniform, and the air flow distributions flowing into the vane plates 9 set at even intervals also become non-uniform.
Therefore, since the air flow distribution between the blades 9 is different, the pressure distribution formed around each blade 9 is also non-uniform. Therefore,
As shown in FIG. 3, the fluctuation cycle of the pressure fluctuation transmitted from each blade plate with respect to a certain spatial position outside the impeller 8 is T1, T2,
The NZ sound represented by the product of the number Z of blade plates 9 and the rotation frequency N of the impeller 8 is generated in a dispersed state with a specific frequency as a peak. Therefore, harmonic components of the NZ sound are also generated in a dispersed manner, each noise is not concentrated and generated in a specific frequency, and the level of the peak sound is suppressed. Further, since the plurality of blade plates 9 are set at equal intervals, the interval between the blade plates can be set to an appropriate value, turbulence noise does not increase, and the rotational balance of the impeller 8 is mechanically equal. It is close to the balance and does not generate vibration during rotation.

【0023】以上のように本実施例によれば、羽根車8
のモ−タ冷却用通気穴12を不均一な間隔に配設するこ
とにより羽根車8内に流入する気流分布を不均一とし、
各羽根板9周りに発生する圧力分布を異なる分布とする
ことでNZ音のレベルを低減する。また、羽根板9を等
間隔にしているため乱流騒音を増加させることがなく、
しかも重心位置調整用のバランスウェイト等を取り付け
ることなくアンバランス振動を防止している。
As described above, according to this embodiment, the impeller 8
By arranging the motor cooling ventilation holes 12 at non-uniform intervals, the air flow distribution flowing into the impeller 8 becomes non-uniform,
The level of NZ sound is reduced by making the pressure distribution generated around each blade 9 different. Further, since the vane plates 9 are arranged at equal intervals, turbulent noise is not increased,
Moreover, unbalance vibration is prevented without attaching a balance weight or the like for adjusting the position of the center of gravity.

【0024】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。図4は、本発明の第2の実施
例における遠心送風機の羽根車の断面を示すものであ
る。第1の実施例と異なるのは羽根車8に設けたモ−タ
冷却用通気穴13は長穴形状に成形しそれぞれ等間隔θ
で配設してあり、それぞれ異なる長さl1、l2、l
3、l4に設定することによりそれぞれの通気穴面積を
異なった面積に設定した点である。
The second embodiment of the present invention will be described below with reference to the drawings. FIG. 4 shows a cross section of an impeller of a centrifugal blower according to a second embodiment of the present invention. The difference from the first embodiment is that the motor cooling vent holes 13 provided in the impeller 8 are formed in a long hole shape and are equidistant from each other.
Are arranged at different lengths l1, l2, l
This is because the vent hole areas are set to different areas by setting the air holes to 3, 14 respectively.

【0025】以上のように構成された遠心送風機につい
て以下、その動作を説明する。各モ−タ冷却用通気穴1
3は不均一な面積に設定されているため、各モ−タ冷却
用通気穴13から噴出する還流流れの流速および流量は
不均一となり流入気流の偏向角度は不均一となる。そこ
で、等間隔に設定した羽根板8に流入する吸い込み流れ
は、各羽根板8に対して不均一となり、各羽根板間の流
れ分布が異なりNZ音の音圧レベルは低下する。尚、モ
−タ冷却用通気穴13は隣接する通気穴との間隔を等距
離に設定してあり、長穴を切削し長さを調整することに
より面積を変え気流偏向角度を変えることができるた
め、羽根車組立後に遠心送風機の実使用条件に応じてN
Z音の調整が容易にできる。また、羽根板8は等間隔に
設定しているため乱流騒音の増加はなく、かつ機械的に
は等バランスに近い状態であり回転時に振動を発生する
ことがない。
The operation of the centrifugal blower configured as above will be described below. Ventilation hole 1 for cooling each motor
Since 3 is set to have a non-uniform area, the flow velocity and flow rate of the reflux flow ejected from each motor cooling vent hole 13 are non-uniform, and the deflection angle of the inflow air flow is also non-uniform. Therefore, the suction flow flowing into the vane plates 8 set at equal intervals becomes nonuniform with respect to each vane plate 8, the flow distribution between each vane plate is different, and the sound pressure level of the NZ sound is lowered. The motor cooling vent holes 13 are set at equal distances from the adjoining vent holes, and the area can be changed and the air flow deflection angle can be changed by cutting the oblong holes and adjusting the length. Therefore, depending on the actual usage conditions of the centrifugal blower after assembly of the impeller, N
The Z sound can be easily adjusted. Further, since the vane plates 8 are set at equal intervals, turbulent flow noise does not increase, and the mechanical balance is close to equilibrium, so that vibration does not occur during rotation.

【0026】以上のように本実施例によれば、羽根車8
のモ−タ冷却用通気穴13を不均一な面積に設定するこ
とにより、乱流騒音を増加させることなくNZ音を低減
させ、重心位置調整用のバランスウェイト等を取り付け
ることなくアンバランス振動を防止している。しかも、
羽根車組立後に遠心送風機の実使用条件に応じてNZ音
の調整が容易にできる。
As described above, according to this embodiment, the impeller 8
By setting the motor cooling ventilation holes 13 in non-uniform areas, NZ noise can be reduced without increasing turbulent noise, and unbalanced vibration can be achieved without attaching a balance weight or the like for adjusting the center of gravity. To prevent. Moreover,
After assembly of the impeller, the NZ sound can be easily adjusted according to the actual use conditions of the centrifugal blower.

【0027】以下、本発明の第3の実施例について図面
を参照しながら説明する。図5は、本発明の第3の実施
例における遠心送風機の構造を示すものであり、図6は
その平面図である。第1、第2の実施例と異なるのは吸
込口7に複数の気流偏向板14を設け、前記気流偏向板
14をβ1、β2、β3、β4という異なる取付角度で
配設し、気流偏向板14の気流偏向角度を不均一に設定
した点にある。
The third embodiment of the present invention will be described below with reference to the drawings. FIG. 5 shows the structure of a centrifugal blower according to the third embodiment of the present invention, and FIG. 6 is a plan view thereof. The difference from the first and second embodiments is that a plurality of air flow deflecting plates 14 are provided in the suction port 7, and the air flow deflecting plates 14 are arranged at different attachment angles of β1, β2, β3, β4. This is because the air flow deflection angles of 14 are set to be non-uniform.

【0028】以上のように構成された遠心送風機につい
て以下、その動作を説明する。吸込口7に設けた複数の
気流偏向板14はそれぞれ異なる角度で取り付けられて
いるため、気流偏向角度はそれぞれ不均一な設定とな
り、羽根車9への流入気流の偏向角度は不均一となり、
等間隔に設定した各羽根板間8の流れ分布は不均一とな
り、NZ音の音圧レベルは低下する。また、気流偏向板
14により羽根板8への流入気流の角度は反回転方向へ
強制的に制御されており、羽根車9内部での圧力上昇は
直角に近い角度で流入する場合に比べ高くなり、送風能
力が増加する。また、羽根板8は等間隔に設定している
ため乱流騒音の増加はなく、かつ機械的には等バランス
に状態であり回転時に振動を発生することがない。
The operation of the centrifugal blower configured as described above will be described below. Since the plurality of air flow deflecting plates 14 provided in the suction port 7 are attached at different angles, the air flow deflecting angles become non-uniform, and the deflecting angles of the air flow entering the impeller 9 become non-uniform.
The flow distribution between the vane plates 8 set at equal intervals becomes non-uniform, and the sound pressure level of the NZ sound drops. Further, the angle of the inflow airflow to the vane plate 8 is forcibly controlled in the counter-rotational direction by the airflow deflection plate 14, and the pressure rise inside the impeller 9 becomes higher than that when it inflows at an angle close to a right angle. , The blowing capacity is increased. Further, since the vane plates 8 are set at equal intervals, turbulent noise is not increased, and the vane plates 8 are mechanically equilibrium, so that vibration does not occur during rotation.

【0029】以上のように、本実施例によれば、吸込口
7に複数の気流偏向板14を設け、前記気流偏向板の気
流偏向角度を不均一に設定することににより、NZ音の
音圧レベルは低下し、送風能力が増加する。また、乱流
騒音の増加はなく、かつ機械的には等バランスであり回
転時に振動を発生することがない。
As described above, according to this embodiment, by providing a plurality of air flow deflecting plates 14 at the suction port 7 and setting the air flow deflecting angles of the air flow deflecting plates to be non-uniform, the sound of NZ sound is generated. The pressure level is reduced and the blast capacity is increased. Further, there is no increase in turbulent noise, and the mechanical equilibrium prevents vibration during rotation.

【0030】[0030]

【発明の効果】以上のように本発明は、複数の羽根板
と、前記羽根板を固定した主板と、前記羽根板の反主板
側端面に固定した側板とで羽根車を構成し、前記羽根板
は互いに等間隔に設置し、かつ前記主板に複数のモ−タ
冷却用通気穴を設け、前記モ−タ冷却用通気穴を不均一
な間隔に配設することにより、乱流騒音を増加させるこ
となくNZ音を低減させ、しかも重心位置調整用のバラ
ンスウェイト等を取り付けることなくアンバランス振動
を防止することができる。
As described above, according to the present invention, a plurality of vanes, a main plate to which the vanes are fixed, and a side plate fixed to an end face of the vanes opposite to the main plate constitute an impeller, and the vanes are provided. Turbulence noise is increased by installing the plates at equal intervals, providing a plurality of air holes for cooling the motor on the main plate, and arranging the air holes for the motor cooling at non-uniform intervals. It is possible to reduce the NZ noise without doing so and to prevent unbalance vibration without attaching a balance weight or the like for adjusting the center of gravity.

【0031】さらに、羽根車のモ−タ冷却用通気穴を不
均一な面積に設定することにより、乱流騒音を増加させ
ることなくNZ音を低減させ、重心位置調整用のバラン
スウェイト等を取り付けることなくアンバランス振動を
防止することができる。しかも、羽根車組立後に遠心送
風機の実使用条件に応じてNZ音の調整が容易にでき
る。
Further, by setting the ventilation holes for cooling the motor of the impeller in a non-uniform area, the NZ noise can be reduced without increasing the turbulent noise, and a balance weight or the like for adjusting the position of the center of gravity is attached. Unbalanced vibration can be prevented without Moreover, the NZ sound can be easily adjusted after the impeller is assembled according to the actual use conditions of the centrifugal blower.

【0032】さらに、吸込口に複数の気流偏向板を設
け、前記気流偏向板の気流偏向角度を不均一に設定する
ことににより、乱流騒音を増加させることなくNZ音の
音圧レベルを低減し、しかも送風能力を増加させること
ができる。また、機械的には等バランスであり回転時に
振動を発生することがない。
Further, by providing a plurality of air flow deflecting plates at the suction port and setting the air flow deflecting angles of the air flow deflecting plates to be non-uniform, the sound pressure level of the NZ sound is reduced without increasing turbulent noise. In addition, the blowing capacity can be increased. Further, the mechanically equilibrium does not generate vibration during rotation.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の第1の実施例における遠心送風機の断
面図
FIG. 1 is a sectional view of a centrifugal blower according to a first embodiment of the present invention.

【図2】図1の遠心送風機の羽根車のB−B線要部断面
FIG. 2 is a cross-sectional view of the main part of the impeller of the centrifugal blower of FIG. 1 taken along the line BB.

【図3】同実施例の遠心送風機の羽根車の外部における
圧力の変化を示す特性図
FIG. 3 is a characteristic diagram showing changes in pressure outside the impeller of the centrifugal blower of the embodiment.

【図4】本発明の第2の実施例のの遠心送風機の羽根車
の要部断面図
FIG. 4 is a sectional view of an essential part of an impeller of a centrifugal blower according to a second embodiment of the present invention.

【図5】本発明の第3の実施例における遠心送風機の断
面図
FIG. 5 is a sectional view of a centrifugal blower according to a third embodiment of the present invention.

【図6】図5の遠心送風機の要部平面図FIG. 6 is a plan view of a main part of the centrifugal blower shown in FIG.

【図7】従来の遠心送風機の断面図FIG. 7 is a cross-sectional view of a conventional centrifugal blower.

【図8】図7の遠心送風機の羽根車のA−A線要部断面
8 is a cross-sectional view of the main part of the impeller of the centrifugal blower of FIG. 7 taken along the line AA.

【符号の説明】[Explanation of symbols]

8 羽根車 9 羽根板 10 主板 11 側板 12 通風穴 13 通風穴 14 気流偏向板 8 Impeller 9 Blade 10 Main Plate 11 Side Plate 12 Ventilation Hole 13 Ventilation Hole 14 Air Flow Deflection Plate

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 複数の羽根板と、前記羽根板を固定した
主板と、前記羽根板の反主板側端面に固定した側板とで
羽根車を構成し、前記羽根板は互いに等間隔に設置し、
かつ前記主板に複数のモ−タ冷却用通気穴を設け、前記
モ−タ冷却用通気穴を不均一な間隔に配設した遠心送風
機。
1. A vane wheel is composed of a plurality of vanes, a main plate to which the vanes are fixed, and a side plate fixed to an end face of the vanes opposite to the main plate. The vanes are installed at equal intervals. ,
A centrifugal blower in which a plurality of motor cooling vent holes are provided in the main plate, and the motor cooling vent holes are arranged at non-uniform intervals.
【請求項2】 複数の羽根板と、前記羽根板を固定した
主板と、前記羽根板の反主板側端面に固定した側板とで
羽根車を構成し、前記羽根板は互いに等間隔に設置し、
かつ前記主板に複数のモ−タ冷却用通気穴を設け、前記
モ−タ冷却用通気穴の面積を不均一に設定した遠心送風
機。
2. An impeller comprising a plurality of vanes, a main plate to which the vanes are fixed, and a side plate fixed to an end face of the vanes opposite to the main plate, the vanes being installed at equal intervals from each other. ,
A centrifugal blower in which a plurality of motor cooling vent holes are provided in the main plate, and the areas of the motor cooling vent holes are set to be non-uniform.
【請求項3】 複数の羽根板と、前記羽根板を固定した
主板と、前記羽根板の反主板側端面に固定した側板とで
羽根車を構成し、前記羽根板は互いに等間隔に設置し、
かつ吸込口に複数の気流偏向板を設け、前記気流偏向板
の気流偏向角度を不均一に設定した遠心送風機。
3. An impeller comprising a plurality of vanes, a main plate to which the vanes are fixed, and a side plate fixed to an end face of the vanes opposite to the main plate, the vanes being installed at equal intervals from each other. ,
A centrifugal blower in which a plurality of air flow deflecting plates are provided at the suction port and the air flow deflecting angles of the air flow deflecting plates are set to be non-uniform.
JP14345493A 1993-06-15 1993-06-15 Centrifugal blower Pending JPH074390A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14345493A JPH074390A (en) 1993-06-15 1993-06-15 Centrifugal blower

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14345493A JPH074390A (en) 1993-06-15 1993-06-15 Centrifugal blower

Publications (1)

Publication Number Publication Date
JPH074390A true JPH074390A (en) 1995-01-10

Family

ID=15339083

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14345493A Pending JPH074390A (en) 1993-06-15 1993-06-15 Centrifugal blower

Country Status (1)

Country Link
JP (1) JPH074390A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09317686A (en) * 1996-05-29 1997-12-09 Daikin Ind Ltd Fan for blower and rotation balance adjusting method thereof
KR100420517B1 (en) * 2001-08-28 2004-03-02 엘지전자 주식회사 A fan housing
JP2018003686A (en) * 2016-06-30 2018-01-11 ミネベアミツミ株式会社 Centrifugal fan
JP2019120216A (en) * 2018-01-10 2019-07-22 三菱電機株式会社 Fan and manufacturing method thereof
WO2023135782A1 (en) * 2022-01-17 2023-07-20 三菱電機株式会社 Centrifugal blower, and indoor unit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09317686A (en) * 1996-05-29 1997-12-09 Daikin Ind Ltd Fan for blower and rotation balance adjusting method thereof
KR100420517B1 (en) * 2001-08-28 2004-03-02 엘지전자 주식회사 A fan housing
JP2018003686A (en) * 2016-06-30 2018-01-11 ミネベアミツミ株式会社 Centrifugal fan
US10458424B2 (en) 2016-06-30 2019-10-29 Minebea Mitsumi Inc. Centrifugal fan
JP2019120216A (en) * 2018-01-10 2019-07-22 三菱電機株式会社 Fan and manufacturing method thereof
WO2023135782A1 (en) * 2022-01-17 2023-07-20 三菱電機株式会社 Centrifugal blower, and indoor unit

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