JP3882324B2 - Centrifugal fan - Google Patents

Centrifugal fan Download PDF

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Publication number
JP3882324B2
JP3882324B2 JP07574798A JP7574798A JP3882324B2 JP 3882324 B2 JP3882324 B2 JP 3882324B2 JP 07574798 A JP07574798 A JP 07574798A JP 7574798 A JP7574798 A JP 7574798A JP 3882324 B2 JP3882324 B2 JP 3882324B2
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Japan
Prior art keywords
cooling air
hub
fan
guide piece
front side
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JPH11270493A (en
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匡史 東田
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Daikin Industries Ltd
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Daikin Industries 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
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
    • 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
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system

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

Description

【０００１】
【発明の属する技術分野】
【０００２】
本願発明は、空気調和機等において送風機として用いられる遠心ファンに関するものである。
【従来の技術】
【０００３】
例えば、天井埋込式空気調和機は、図５に示すように、天井Ｃに形成された開口３の上方に空気調和機本体１を配置し、該空気調和機本体１の下面に対して前記開口３を覆う矩形形状の化粧パネル２を取り付けて構成されており、前記空気調和機本体１内には、送風機として作用する遠心ファン４、熱交換器５が内蔵される一方、前記化粧パネル２には、エアフィルター６、空気吸込口７、空気吹出口８が設けられている。
【０００４】
前記遠心ファン４は、例えば、ハブ１０とシュラウド１１との間の外周縁部に多数の後退翼１２，１２・・を架設してなるファンロータ９と、該ファンロータ９の駆動源であるファンモータ１３とからなるターボファンとされている。このような構成のターボファン４の場合、ファンモータ１３がハブ１０の背面側に位置することとなるため、ファンモータ１３の冷却が不十分となるおそれがある。
【０００５】
そこで、前記ハブ１０に、前記ファンモータ１３を冷却する冷却風Ｗ′をハブ１０前面側に導出する複数の冷却風導出穴１４，１４・・を形成して、前記冷却風Ｗ′によりファンモータ１３を冷却するようにしたものが提案されている（図６参照）。
【発明が解決しようとする課題】
【０００６】
ところが、上記従来技術におけるように、ハブ１０に単に冷却風導出穴１４を形成しただけでは、図７に示すように、冷却風導出穴１４から導出される冷却風Ｗ′が、ハブ１０に沿う流れとならないため、遠心ファン４内を流れる空気主流Ｗと干渉して送風音を大きくする原因の一つとなっていた。
【０００７】
また、冷却風Ｗ′は、遠心ファン４の吐出部と冷却風導出穴１４の出口部分との圧力差のみにより流れることとなっているため、遠心ファン４と空気調和機本体１の天面１ａとの間に比較的大きな隙間Ｄ（図５参照）が必要となる。該隙間Ｄは、遠心ファン４を取り付けるときに必要なクリアランスより相当大きくならざるを得ないところから、空気調和機本体１の上下方向寸法Ｈ（図５参照）が大きくなってしまうという問題もある。
【０００８】
本願発明は、上記の点に鑑みてなされたもので、送風音の低減を図るとともに、空気調和機に組み込んだ場合における製品の薄型化を図ることを目的とするものである。
【課題を解決するための手段】
【０００９】
本願発明の基本構成（請求項１の発明）では、上記課題を解決するための手段として、ハブ１０とシュラウド１１との間の外周縁部に多数の翼片１２，１２・・を架設してなるファンロータ９と、該ファンロータ９の駆動源であるファンモータ１３とからなり、前記ハブ１０に、前記ファンモータ１３を冷却した冷却風Ｗ′を前記ハブ１０の前面側１０ａに導出する冷却風導出穴１４を形成した遠心ファンにおいて、前記冷却風導出穴１４に、回転方向後側となる口縁１４ａから前記ハブ１０の背面側１０ｂにおいて回転方向前側に延びる背面側ガイド片１５と、回転方向前側の口縁１４ｂから前記ハブ１０の前面側１０ｂにおいて回転方向後側に延びる前面側ガイド片１６とを形成している。
【００１０】
上記のように構成したことにより、ファンロータ９の回転に伴って冷却風Ｗ′が背面側ガイド片１５にガイドされつつ冷却風導出穴１４に向かって流れることとなり、導出された冷却風Ｗ′はハブ１０の前面側に沿って流れることとなる。従って、冷却風Ｗ′とファンロータ９内を流れる空気主流Ｗとの干渉が回避されることとなり、送風音が低減できる。
【００１１】
また、冷却風Ｗ′は、背面側ガイド片１５にガイドされつつ冷却風導出穴１４に向かって流れる（即ち、背面側ガイド片１４が羽根として作用する）こととなっているため、圧力差のみで流れる従来例のものに比べて冷却風Ｗ′の風量確保が容易となる。従って、空気調和機に組み込んだ場合においても、遠心ファン４と空気調和機の壁面との間にクリアランス以上の隙間を設ける必要がなくなり、空気調和機の薄型化を図ることもできる。
【００１２】
さらに、冷却風導出穴１４における回転方向前側の口縁１４ｂから前記ハブ１０の前面側１０ｂにおいて回転方向後側に延びる前面側ガイド片１６を形成したことにより、冷却風導出穴１４の開口面積を大きくとることができることとなり、冷却風Ｗ′の風量確保が容易となる。
【００１３】
請求項２の発明におけるように、前記前面側ガイド片１６の回転方向後端１６ａを、前記背面側ガイド片１５の回転方向前端１５ａより回転方向前方側に位置させた場合、型抜きが容易に行えるところから、ファンロータ９を合成樹脂の一体成形品で構成することができることとなり、コストダウンを図ることができる。
【発明の実施の形態】
【００１４】
以下、添付の図面を参照して、本願発明の参考例および好適な実施の形態について詳述する。
【００１５】
参考例
図１ないし図３には、本願発明の参考例にかかる遠心ファンにおけるファンロータが示されている。
【００１６】
本参考例にかかる遠心ファンも、従来技術の項において既に説明したものと同様に、天井埋込式空気調和機（図５参照）の送風機として用いられるものであり、ハブ１０とシュラウド１１との間の外周縁部に多数の翼片（即ち、後退翼）１２，１２・・を架設してなるファンロータ９と、該ファンロータ９の駆動源であるファンモータ１３とからなるターボファンとされている。また、前記ハブ１０には、前記ファンモータ１３を冷却する冷却風Ｗ′をハブ１０前面側に導出する複数の冷却風導出穴１４，１４・・が形成されており、前記冷却風Ｗ′によりファンモータ１３を冷却するようにしている。
【００１７】
そして、前記冷却風導出穴１４には、図２および図３に示すように、回転方向Ｍの後側となる口縁１４ａから前記ハブ１０の背面側１０ｂにおいて回転方向Ｍの前側に延びる断面Ｌ字状の背面側ガイド片１５が一体に形成されている。該背面側ガイド片１５の回転方向前端１５ａは、前記冷却風導出穴１４の回転方向前側の口縁１４ｂより回転方向後方側に位置せしめられている。なお、前記背面側ガイド片１５は、図２に示すように垂直部と水平部とをＲ部で連結した形状としてもよく、図３に示すように垂直部と水平部とを直角に連結した形状としてもよい。
【００１８】
上記のように構成したことにより、ファンロータ９の回転に伴って冷却風Ｗ′が背面側ガイド片１５にガイドされつつ冷却風導出穴１４に向かって流れることとなり、導出された冷却風Ｗ′はハブ１０の前面側に沿って流れることとなる。従って、冷却風Ｗ′とファンロータ９内を流れる空気主流Ｗ（図５参照）との干渉が回避されることとなり、送風音が低減できる。
【００１９】
また、冷却風Ｗ′は、背面側ガイド片１５にガイドされつつ冷却風導出穴１４に向かって流れる（即ち、背面側ガイド片１４が羽根として作用する）こととなっているため、圧力差のみで流れる従来例のものに比べて冷却風Ｗ′の風量確保が容易となる。従って、空気調和機に組み込んだ場合においても、遠心ファン４と空気調和機の壁面（例えば、図５に示す空気調和機本体１の天面１ａ）との間にクリアランス以上の隙間を設ける必要がなくなり、空気調和機の薄型化を図ることもできる。
【００２０】
しかも、背面側ガイド片１５の回転方向前端１５ａを、前記冷却風導出穴１４の回転方向前側の口縁１４ｂより回転方向後方側に位置せしめるようにしているので、オーバーハング部ができないこととなって、型抜きが容易に行えるところから、ファンロータ９を合成樹脂の一体成形品で構成することができることとなり、コストダウンを図ることができる。
【００２１】
第１の実施の形態（請求項１、２に対応）
図４には、本願発明の第１の実施の形態にかかる遠心ファンにおけるファンロータの要部が示されている。
【００２２】
この場合、前記冷却風導出穴１４には、参考例における背面側ガイド片１５に加えて、回転方向前側の口縁１４ｂから前記ハブ１０の前面側１０ｂにおいて回転方向Ｍの後側に延びる前面側ガイド片１６が形成されている。このようにすると、冷却風導出穴１４の開口面積を大きくとることができることとなり、冷却風Ｗ′の風量確保が容易となる。
【００２３】
また、該前面側ガイド片１６の回転方向後端１６ａは、背面側ガイド片１５の回転方向前端１５ａより回転方向前方側に位置せしめられている。従って、オーバーハング部ができないこととなって、型抜きが容易に行えるところから、ファンロータ９を合成樹脂の一体成形品で構成することができることとなり、コストダウンを図ることができる。
【００２４】
なお、本実施の形態においては、背面側および前面側ガイド片１５，１６を、垂直部と水平部とを直角に連結した形状としているが、垂直部と水平部とをＲ部で連結した形状としてもよい。
【００２５】
その他の構成および作用効果は、参考例におけると同様なので説明を省略する。
【発明の効果】
【００２６】
本願発明（請求項１の発明）によれば、ハブ１０とシュラウド１１との間の外周縁部に多数の翼片１２，１２・・を架設してなるファンロータ９と、該ファンロータ９の駆動源であるファンモータ１３とからなり、前記ハブ１０に、前記ファンモータ１３を冷却した冷却風Ｗ′を前記ハブ１０の前面側１０ａに導出する冷却風導出穴１４を形成した遠心ファンにおいて、前記冷却風導出穴１４に、回転方向後側となる口縁１４ａから前記ハブ１０の背面側１０ｂにおいて回転方向に延びる背面側ガイド片１５を形成して、ファンロータ９の回転に伴って冷却風Ｗ′が背面側ガイド片１５にガイドされつつ冷却風導出穴１４に向かって流れるようにしたので、導出された冷却風Ｗ′はハブ１０の前面側に沿って流れることとなる。従って、冷却風Ｗ′とファンロータ９内を流れる空気主流Ｗとの干渉が回避されることとなり、送風音が低減できるという効果がある。
【００２７】
また、冷却風Ｗ′は、背面側ガイド片１５にガイドされつつ冷却風導出穴１４に向かって流れる（即ち、背面側ガイド片１４が羽根として作用する）こととなっているため、圧力差のみで流れる従来例のものに比べて冷却風Ｗ′の風量確保が容易となる。従って、空気調和機に組み込んだ場合においても、遠心ファン４と空気調和機の壁面との間にクリアランス以上の隙間を設ける必要がなくなり、空気調和機の薄型化を図ることもできるという効果もある。
【００２８】
さらに、冷却風導出穴１４における回転方向前側の口縁１４ｂから前記ハブ１０の前面側１０ｂにおいて回転方向後側に延びる前面側ガイド片１６を形成したことにより、冷却風導出穴１４の開口面積を大きくとることができることとなり、冷却風Ｗ′の風量確保が容易となるという効果もある。
【００２９】
請求項１の発明におけるように、前記前面側ガイド片１６の回転方向後端１６ａを、前記背面側ガイド片１５の回転方向前端１５ａより回転方向前方側に位置させた場合、型抜きが容易に行えるところから、ファンロータ９を合成樹脂の一体成形品で構成することができることとなり、コストダウンを図ることができる。
【図面の簡単な説明】
【図１】 本願発明の参考例にかかる遠心ファンにおけるファンロータの平面図である。
【図２】 図１のＩＩ−ＩＩ拡大断面図である。
【図３】 本願発明の参考例にかかる遠心ファンのファンロータにおける冷却風導出穴部分の変形例を示す拡大断面図（図２相当図）である。
【図４】 本願発明の第１の実施の形態にかかる遠心ファンのファンロータにおける冷却風導出穴部分の拡大断面図（図２相当図）である。
【図５】 一般の天井埋込式空気調和機の縦断面図である。
【図６】 図５に示す天井埋込式空気調和機において用いられている遠心ファンにおけるファンロータの平面図である。
【図７】 図６のＶＩＩ−ＶＩＩ拡大断面図である。
【符号の説明】
９はファンロータ、１０はハブ、１０ａは背面側、１０ｂは前面側、１１はシュラウド、１２は翼片、１３はファンモータ、１４は冷却風導出穴、１４ａは回転方向後側の口縁、１４ｂは回転方向前側の口縁、１５は背面側ガイド片、１５ａは回転方向前端、１６は前面側ガイド片、１６ａは回転方向後端、Ｍは回転方向、Ｗは空気主流、Ｗ′は冷却風。[0001]
BACKGROUND OF THE INVENTION
[0002]
The present invention relates to a centrifugal fan used as a blower in an air conditioner or the like.
[Prior art]
[0003]
For example, the ceiling-embedded air conditioner has an air conditioner main body 1 disposed above an opening 3 formed in the ceiling C as shown in FIG. A rectangular decorative panel 2 covering the opening 3 is attached, and a centrifugal fan 4 and a heat exchanger 5 acting as a blower are incorporated in the air conditioner body 1 while the decorative panel 2 is incorporated. Are provided with an air filter 6, an air inlet 7 and an air outlet 8.
[0004]
The centrifugal fan 4 includes, for example, a fan rotor 9 in which a large number of receding blades 12, 12,... Are installed on the outer peripheral edge between the hub 10 and the shroud 11, and a fan that is a drive source of the fan rotor 9. The turbo fan is composed of a motor 13. In the case of the turbo fan 4 having such a configuration, the fan motor 13 is located on the back side of the hub 10, so that the cooling of the fan motor 13 may be insufficient.
[0005]
Therefore, the hub 10 is formed with a plurality of cooling air outlet holes 14, 14,... For leading the cooling air W 'for cooling the fan motor 13 to the front surface side of the hub 10, and the fan motor is formed by the cooling air W'. There has been proposed one that cools 13 (see FIG. 6).
[Problems to be solved by the invention]
[0006]
However, just by forming the cooling air derivation hole 14 in the hub 10 as in the prior art described above, the cooling air W ′ derived from the cooling air derivation hole 14 follows the hub 10 as shown in FIG. Since the air does not flow, it interferes with the main air flow W flowing through the centrifugal fan 4 and becomes one of the causes of increasing the blowing sound.
[0007]
Further, since the cooling air W ′ flows only by the pressure difference between the discharge portion of the centrifugal fan 4 and the outlet portion of the cooling air outlet hole 14, the top surface 1 a of the centrifugal fan 4 and the air conditioner main body 1. A relatively large gap D (see FIG. 5) is required. Since the gap D must be considerably larger than the clearance required when the centrifugal fan 4 is attached, there is also a problem that the vertical dimension H (see FIG. 5) of the air conditioner body 1 is increased. .
[0008]
This invention is made | formed in view of said point, While aiming at reduction of blowing sound, it aims at aiming at thickness reduction of the product at the time of incorporating in an air conditioner.
[Means for Solving the Problems]
[0009]
In the basic configuration of the present invention (invention of claim 1), as means for solving the above-mentioned problems, a large number of blade pieces 12, 12,... Are installed on the outer peripheral edge portion between the hub 10 and the shroud 11. And a fan motor 13 that is a drive source of the fan rotor 9. The cooling air W ′ that cools the fan motor 13 is led to the hub 10 to the front side 10 a of the hub 10. In the centrifugal fan in which the air outlet hole 14 is formed, the cooling air outlet hole 14 is provided with a rear guide piece 15 extending from the rear edge 10a on the rear side in the rotational direction to the front side in the rotational direction on the rear side 10b of the hub 10, and A front-side guide piece 16 extending rearward in the rotational direction on the front side 10b of the hub 10 from the front edge 14b is formed.
[0010]
With the configuration described above, the cooling air W ′ flows toward the cooling air outlet hole 14 while being guided by the rear side guide piece 15 as the fan rotor 9 rotates, and the derived cooling air W ′. Flows along the front side of the hub 10. Accordingly, interference between the cooling air W ′ and the main air flow W flowing in the fan rotor 9 is avoided, and the blowing sound can be reduced.
[0011]
In addition, the cooling air W ′ flows toward the cooling air outlet hole 14 while being guided by the back side guide piece 15 (that is, the back side guide piece 14 acts as a blade), and therefore only the pressure difference. The air volume of the cooling air W ′ can be easily ensured as compared with the conventional example flowing in Therefore, even when incorporated in an air conditioner, there is no need to provide a gap larger than the clearance between the centrifugal fan 4 and the wall surface of the air conditioner, and the air conditioner can be made thinner.
[0012]
Further, by forming the front side guide piece 16 extending from the front edge 10b of the cooling air outlet hole 14 to the rear side of the front side 10b of the hub 10, the opening area of the cooling air outlet hole 14 can be reduced. It becomes possible to make large, and it becomes easy to secure the air volume of the cooling air W ′.
[0013]
When the rear end 16a in the rotational direction of the front guide piece 16 is positioned on the front side in the rotational direction from the front end 15a in the rotational direction of the rear guide piece 15 as in the invention of claim 2 , the die can be easily removed. Since it can be performed, the fan rotor 9 can be formed of a synthetic resin integrally molded product, and the cost can be reduced.
DETAILED DESCRIPTION OF THE INVENTION
[0014]
Hereinafter, reference examples and preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0015]
Reference Example FIGS. 1 to 3 show a fan rotor in a centrifugal fan according to a reference example of the present invention.
[0016]
The centrifugal fan according to this reference example is also used as a blower of a ceiling-embedded air conditioner (see FIG. 5), similar to the one already described in the section of the prior art, and includes the hub 10 and the shroud 11. A turbo fan comprising a fan rotor 9 in which a large number of blade pieces (that is, receding blades) 12, 12... Are installed on the outer peripheral edge between the fan rotor 9 and a fan motor 13 which is a drive source of the fan rotor 9. ing. Further, the hub 10 is formed with a plurality of cooling air derivation holes 14, 14... For guiding the cooling air W ′ for cooling the fan motor 13 to the front side of the hub 10. The fan motor 13 is cooled.
[0017]
As shown in FIGS. 2 and 3, the cooling air outlet hole 14 has a cross-section L extending from the lip 14 a on the rear side in the rotational direction M to the front side in the rotational direction M on the back side 10 b of the hub 10. A character-shaped back side guide piece 15 is integrally formed. The front end 15a in the rotational direction of the back side guide piece 15 is positioned on the rear side in the rotational direction from the front edge 14b of the cooling air derivation hole 14 in the rotational direction. The back side guide piece 15 may have a shape in which the vertical portion and the horizontal portion are connected by the R portion as shown in FIG. 2, and the vertical portion and the horizontal portion are connected at a right angle as shown in FIG. It is good also as a shape.
[0018]
With the configuration described above, the cooling air W ′ flows toward the cooling air outlet hole 14 while being guided by the rear side guide piece 15 as the fan rotor 9 rotates, and the derived cooling air W ′. Flows along the front side of the hub 10. Therefore, interference between the cooling air W ′ and the main air flow W (see FIG. 5) flowing through the fan rotor 9 is avoided, and the blowing sound can be reduced.
[0019]
In addition, the cooling air W ′ flows toward the cooling air outlet hole 14 while being guided by the back side guide piece 15 (that is, the back side guide piece 14 acts as a blade), and therefore only the pressure difference. The air volume of the cooling air W ′ can be easily ensured as compared with the conventional example flowing in Therefore, even when incorporated in an air conditioner, it is necessary to provide a clearance larger than the clearance between the centrifugal fan 4 and the wall surface of the air conditioner (for example, the top surface 1a of the air conditioner body 1 shown in FIG. 5). The air conditioner can be made thinner.
[0020]
In addition, since the front end 15a in the rotational direction of the back guide piece 15 is positioned on the rear side in the rotational direction from the front edge 14b in the rotational direction of the cooling air outlet hole 14, an overhang portion cannot be formed. Thus, since the mold can be easily removed, the fan rotor 9 can be formed of an integrally molded product of synthetic resin, and the cost can be reduced.
[0021]
First Embodiment (corresponding to claim 1, 2)
FIG. 4 shows a main part of the fan rotor in the centrifugal fan according to the first embodiment of the present invention.
[0022]
In this case, in addition to the rear side guide piece 15 in the reference example , the cooling air outlet hole 14 has a front side extending from the front edge 10b of the rotational direction to the rear side in the rotational direction M on the front side 10b of the hub 10. A guide piece 16 is formed. If it does in this way, the opening area of the cooling air derivation | leading-out hole 14 can be taken large, and air volume ensuring of the cooling air W 'becomes easy.
[0023]
Further, the rear end 16 a in the rotation direction of the front guide piece 16 is positioned on the front side in the rotation direction from the front end 15 a in the rotation direction of the rear guide piece 15. Accordingly, since the overhang portion cannot be formed and the mold can be easily removed, the fan rotor 9 can be formed of an integrally molded product of synthetic resin, and the cost can be reduced.
[0024]
In the present embodiment, the back side and front side guide pieces 15 and 16 have a shape in which the vertical part and the horizontal part are connected at right angles, but the shape in which the vertical part and the horizontal part are connected by the R part. It is good.
[0025]
Other configurations and operational effects are the same as those in the reference example , and thus the description thereof is omitted.
【The invention's effect】
[0026]
According to the present invention (invention of claim 1), a fan rotor 9 in which a large number of blade pieces 12, 12... Are installed on the outer peripheral edge portion between the hub 10 and the shroud 11, and the fan rotor 9. A centrifugal fan comprising a fan motor 13 as a drive source, and formed with a cooling air outlet hole 14 in the hub 10 for extracting the cooling air W ′ that has cooled the fan motor 13 to the front side 10a of the hub 10, A rear side guide piece 15 extending in the rotational direction on the rear side 10b of the hub 10 is formed in the cooling air outlet hole 14 from the rear edge 14a of the hub 10 in the rotational direction. Since W ′ is guided toward the cooling air guide hole 14 while being guided by the rear guide piece 15, the derived cooling air W ′ flows along the front side of the hub 10. Accordingly, the interference between the cooling air W ′ and the main air flow W flowing in the fan rotor 9 is avoided, and there is an effect that the blowing sound can be reduced.
[0027]
In addition, the cooling air W ′ flows toward the cooling air outlet hole 14 while being guided by the back side guide piece 15 (that is, the back side guide piece 14 acts as a blade), and therefore only the pressure difference. The air volume of the cooling air W ′ can be easily ensured as compared with the conventional example flowing in There is therefore, even when incorporated in an air conditioner, it is not necessary to provide a clearance or gap between the wall surface of the centrifugal fan 4 and the air conditioner, an effect that may be made thinner air conditioner .
[0028]
Further, by forming the front side guide piece 16 extending from the front edge 10b of the cooling air outlet hole 14 to the rear side of the front side 10b of the hub 10, the opening area of the cooling air outlet hole 14 can be reduced. It is possible to obtain a large amount, and there is an effect that it is easy to secure the air volume of the cooling air W ′.
[0029]
As in the first aspect of the present invention, when the rear end 16a in the rotational direction of the front guide piece 16 is positioned on the front side in the rotational direction from the front end 15a in the rotational direction of the rear guide piece 15, the die can be easily removed. Since it can be performed, the fan rotor 9 can be formed of a synthetic resin integrally molded product, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view of a fan rotor in a centrifugal fan according to a reference example of the present invention.
FIG. 2 is an enlarged sectional view taken along the line II-II in FIG.
FIG. 3 is an enlarged cross-sectional view (corresponding to FIG. 2) showing a modification of the cooling air outlet hole portion in the fan rotor of the centrifugal fan according to the reference example of the present invention.
FIG. 4 is an enlarged sectional view (corresponding to FIG. 2) of a cooling air outlet hole portion in the fan rotor of the centrifugal fan according to the first embodiment of the present invention.
FIG. 5 is a longitudinal sectional view of a general ceiling-embedded air conditioner.
6 is a plan view of a fan rotor in a centrifugal fan used in the ceiling-embedded air conditioner shown in FIG.
7 is an enlarged sectional view taken along line VII-VII in FIG.
[Explanation of symbols]
9 is a fan rotor, 10 is a hub, 10a is a back side, 10b is a front side, 11 is a shroud, 12 is a blade, 13 is a fan motor, 14 is a cooling air outlet hole, 14a is a rear edge of the rotation direction, 14b is the front edge of the rotation direction, 15 is the back guide piece, 15a is the rotation direction front end, 16 is the front side guide piece, 16a is the rotation direction rear end, M is the rotation direction, W is the main air flow, and W 'is the cooling Wind.

Claims (2)

ハブ（１０）とシュラウド（１１）との間の外周縁部に多数の翼片（１２），（１２）・・を架設してなるファンロータ（９）と、該ファンロータ（９）の駆動源であるファンモータ（１３）とからなり、前記ハブ（１０）には、前記ファンモータ（１３）を冷却する冷却風（Ｗ′）を前記ハブ（１０）の前面側（１０ａ）に導出する冷却風導出穴（１４）を形成した遠心ファンであって、前記冷却風導出穴（１４）には、回転方向後側となる口縁（１４ａ）から前記ハブ（１０）の背面側（１０ｂ）において回転方向前側に延びる背面側ガイド片（１５）と、回転方向前側の口縁（１４ｂ）から前記ハブ（１０）の前面側（１０ａ）において回転方向後側に延びる前面側ガイド片（１６）とを形成したことを特徴とする遠心ファン。A fan rotor (9) in which a large number of blade pieces (12), (12),... Are installed on the outer peripheral edge between the hub (10) and the shroud (11), and driving of the fan rotor (9) It consists of a fan motor (13) as a source, and cooling air (W ′) for cooling the fan motor (13) is led to the front side (10a) of the hub (10). A centrifugal fan in which a cooling air outlet hole (14) is formed. The cooling air outlet hole (14) has a rear edge (10b) of the hub (10) from a mouth edge (14a) on the rear side in the rotation direction. And a front side guide piece (16) extending from the front edge (14b) of the front side in the rotational direction to the rear side in the rotational direction on the front side (10a) of the hub (10). centrifugal fan characterized in that the formation and. 前記前面側ガイド片（１６）の回転方向後端（１６ａ）を、前記背面側ガイド片（１５）の回転方向前端（１５ａ）より回転方向前方側に位置させたことを特徴とする請求項１記載の遠心ファン。Claim 1, wherein the front-side guide piece rotation direction rear end (16a) of (16) was positioned in the rotational direction front side of the rotation direction front end (15a) of the rear side guide piece (15) The described centrifugal fan.
JP07574798A 1998-03-24 1998-03-24 Centrifugal fan Expired - Fee Related JP3882324B2 (en)

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JP07574798A JP3882324B2 (en) 1998-03-24 1998-03-24 Centrifugal fan

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Publication number Priority date Publication date Assignee Title
AU2003284610B2 (en) 2002-12-16 2006-11-16 Daikin Industries, Ltd. Centrifugal fan, and air conditioner provided therewith
JP2005127177A (en) * 2003-10-22 2005-05-19 Matsushita Electric Ind Co Ltd Turbofan
JP2007040617A (en) * 2005-08-03 2007-02-15 Hitachi Ltd Air conditioning indoor unit
JP2008267238A (en) * 2007-04-19 2008-11-06 Japan Servo Co Ltd Centrifugal fan
FR2984810B1 (en) * 2011-12-23 2015-06-19 Valeo Systemes Thermiques AIR COOLING DEVICE OF A PULLER FOR HEATING, VENTILATION AND AIR CONDITIONING APPARATUS
EP3093500B1 (en) * 2014-01-10 2022-03-23 Mitsubishi Electric Corporation Centrifugal fan, air-conditioning device, and air-cleaning device
CN111577654B (en) * 2020-04-23 2021-06-01 奇鋐科技股份有限公司 Fluid pressurization structure and fan thereof
US11525463B2 (en) 2020-05-06 2022-12-13 Asia Vital Components Co., Ltd. Fluid pressurizing structure and fan using same
JPWO2023135782A1 (en) * 2022-01-17 2023-07-20

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