JP5076324B2 - Centrifugal fan - Google Patents

Centrifugal fan Download PDF

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JP5076324B2
JP5076324B2 JP2006018576A JP2006018576A JP5076324B2 JP 5076324 B2 JP5076324 B2 JP 5076324B2 JP 2006018576 A JP2006018576 A JP 2006018576A JP 2006018576 A JP2006018576 A JP 2006018576A JP 5076324 B2 JP5076324 B2 JP 5076324B2
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hub
cooling air
air outlet
fan
outlet hole
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JP2007198280A (en
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あづみ 寺川
恒久 佐柳
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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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system

Description

本発明は、空気調和装置の送風機等に用いられる遠心ファンに関する技術分野に属する。   The present invention belongs to a technical field related to a centrifugal fan used in a blower or the like of an air conditioner.

一般に、天井埋込型の空気調和装置には、送風機として遠心ファン（ターボファン）が設けられており、この遠心ファンにより、空調室内の空気が吸い込まれて、その空気が、遠心ファンの周囲に略環状に配設した熱交換器に吹き付けられた後、空調室内へ吹き出されるようになっている。このような遠心ファンは、互いに対向配置されたハブ及びシュラウドの外周部間に羽根を架設してなるファンロータと、該ハブのシュラウドとは反対側に配設され、該ファンロータをハブの中心軸周りに回転駆動するためのファンモータとを備えている。   Generally, a ceiling-embedded air conditioner is provided with a centrifugal fan (turbo fan) as a blower. The centrifugal fan sucks air in the air-conditioned room, and the air is placed around the centrifugal fan. After being blown onto a heat exchanger arranged in a substantially annular shape, it is blown into the air-conditioned room. Such a centrifugal fan is provided with a fan rotor in which blades are installed between the outer peripheral portions of a hub and a shroud arranged to face each other, and disposed on the opposite side of the hub to the shroud. And a fan motor for rotationally driving around the shaft.

上記遠心ファンにおいては、上記ファンモータの冷却を行うために、ハブの中心近傍に冷却風導出孔が開口形成されている（例えば、特許文献１参照）。すなわち、この冷却風導出孔の形成により、ハブの中心近傍と径方向外側との圧力差によって、ファンロータから吹き出された空気の一部が、ハブのファンモータ側に回り込んで冷却風導出孔からハブのファンモータと反対側へ導出するようになる。このハブのファンモータ側に回り込む空気が、冷却風としてファンモータを冷却し、このファンモータを冷却した冷却風が冷却風導出孔からハブのファンモータと反対側へ導出することになる。   In the centrifugal fan, in order to cool the fan motor, a cooling air outlet hole is formed in the vicinity of the center of the hub (see, for example, Patent Document 1). That is, due to the formation of the cooling air outlet hole, a part of the air blown out from the fan rotor circulates toward the fan motor side of the hub due to the pressure difference between the vicinity of the center of the hub and the radially outer side. To the other side of the hub fan motor. The air that circulates toward the fan motor side of the hub cools the fan motor as cooling air, and the cooling air that has cooled the fan motor is led out from the cooling air outlet hole to the opposite side of the hub motor.

ところが、上記のようにハブに冷却風導出孔を形成すると、冷却風導出孔からハブのファンモータと反対側へ導出された冷却風が、ファンロータ内（ハブとシュラウドとの間）を流れる空気主流と干渉して送風音が大きくなるという問題がある。   However, when the cooling air outlet hole is formed in the hub as described above, the cooling air derived from the cooling air outlet hole to the opposite side of the fan motor of the hub flows in the fan rotor (between the hub and the shroud). There is a problem that the blowing noise increases due to interference with the mainstream.

このような問題を解消するために、従来より、ハブの冷却風導出孔が形成された部分を、ファンモータと反対側からハブカバーで覆うようにすることは知られている（例えば、特許文献２参照）が、ハブカバーをハブとは別個に設けると、コストアップを招くとともに、ハブカバーの配設スペースが必要となって、ファンロータが大型化してしまう。   In order to solve such a problem, it is conventionally known that a portion of the hub where the cooling air outlet hole is formed is covered with a hub cover from the side opposite to the fan motor (for example, Patent Document 2). However, if the hub cover is provided separately from the hub, the cost is increased, and a space for disposing the hub cover is required, which increases the size of the fan rotor.

そこで、ハブカバーを設けないで送風音を低減することが要求されており、そのために、例えば特許文献１では、上記ハブの上記ファンモータ側の面における上記冷却風導出孔のハブ回転方向後側の開口縁部に、該開口縁部からハブ回転方向前側へ延びる背面側ガイド片を形成することで、冷却風導出孔から導出された冷却風がハブのファンモータと反対側の面に沿って流れるようにし、これにより、冷却風と空気主流との干渉を防止して送風音を低減するようにしている。また、特許文献１では、上記背面側ガイド片に加えて、ハブのファンモータと反対側の面における上記冷却風導出孔のハブ回転方向前側の開口縁部に、該開口縁部からハブ回転方向後側へ延びる前面側ガイド片をも形成することが示されている。
特開平１１−２７０４９３号公報 特開２００５−１２７１７７号公報（第５図） Therefore, it is required to reduce the blowing sound without providing a hub cover. For this reason, for example, in Patent Document 1, the cooling air outlet hole on the fan motor side surface of the hub is located on the rear side in the hub rotation direction. By forming the back side guide piece extending from the opening edge to the front side in the hub rotation direction at the opening edge, the cooling air derived from the cooling air outlet hole flows along the surface of the hub opposite to the fan motor. Thus, interference between the cooling air and the main air flow is prevented, and the blowing sound is reduced. Further, in Patent Document 1, in addition to the back side guide piece, an opening edge on the front side in the hub rotation direction of the cooling air outlet hole on the surface opposite to the fan motor of the hub is connected to the hub rotation direction from the opening edge. It is shown that a front side guide piece extending rearward is also formed.
JP 11-270493 A Japanese Patent Laying-Open No. 2005-127177 (FIG. 5)

しかしながら、上記特許文献１のようなガイド片を設ければ、送風音の低減化を図ることはできるものの、冷却風がハブのモータと反対側へ勢いよく導出されるために、ハブカバーを設けた場合に比べて送風音を低減することは困難であり、送風音をより一層低減するためには改良の余地がある。   However, if the guide piece as in Patent Document 1 is provided, the blowing sound can be reduced, but the cooling air is vigorously led out to the opposite side of the hub motor, so a hub cover is provided. It is difficult to reduce the blowing sound compared to the case, and there is room for improvement in order to further reduce the blowing sound.

本発明は、斯かる点に鑑みてなされたものであり、その目的とするところは、上記のような遠心ファンにおいて、ハブカバーを設けないで、送風音を出来る限り低減しようとすることにある。   The present invention has been made in view of such a point, and an object of the present invention is to reduce the blowing sound as much as possible without providing a hub cover in the centrifugal fan as described above.

上記の目的を達成するために、第１の発明では、互いに対向配置されたハブ(12)及びシュラウド(13)の外周部間に羽根(14)を架設してなるファンロータ(11)と、該ハブ(12)のシュラウド(13)とは反対側に配設され、該ファンロータ(11)をハブ(12)の中心軸周りに回転駆動するためのファンモータ(15)と、ハブ(12)のファンモータ(15)側に形成され、該ハブ(12)とシュラウド(13)との間から径方向外側に送出される風の一部を、ファンモータ(15)の冷却風(Wa)としてファンモータ(15)の周辺に導くモータ冷却流路(50)と、を備え、上記ハブ(12)には、該モータ冷却流路(50)とハブ（12）のファンモータ(15)と反対側とを連通して、該ファンモータ(15)を冷却した冷却風(Wa)をハブ(12)のファンモータ(15)と反対側へ導出するための冷却風導出孔(12c)が開口形成された遠心ファンを対象として、上記冷却風導出口(12c)から導出された冷却風(Wa)をファンロータ(11)内に案内するガイド手段をさらに備え、上記ガイド手段は、上記ハブ(12)の上記ファンモータ(15)と反対側の面における上記冷却風導出孔(12c)の開口縁部のうちハブ回転方向後側寄りに位置する部分から突出し、該ハブの回転により該冷却風導出口(12c)を通過して回転方向後側に向かう冷却風を受け止める冷却風受け部(25a)と、基端部が上記冷却風受け部(25a)に接続されると共に該基端部からハブ回転方向前側に向かって延びて上記ハブ回転方向において冷却風導出口(12c)の該回転方向の全体を覆うように形成され、上記冷却風受け部(25a)にて受け止められた冷却風を上記ハブ回転方向後側からハブ回転方向前側に向かって流動案内するガイド部(25b)と、上記ガイド部(25b)におけるハブ回転方向前側端部のハブ径方向の全体に亘る部分と上記冷却風導出孔(12c)の開口縁部との間に形成され、上記ガイド部(25b)によって流動案内された冷却風を、ハブ回転方向後側からハブ回転方向前側に向かってファンロータ内に排出するための開放部(25c)と、を有し、ガイド部(25b)のハブ径方向内側端部と冷却風導出孔(12c)の開口縁部との間が閉塞されている構成とするものである。 In order to achieve the above object, in the first invention, a fan rotor (11) in which blades (14) are installed between outer peripheral portions of a hub (12) and a shroud (13) arranged to face each other; A fan motor (15) disposed on the opposite side of the hub (12) from the shroud (13), for rotating the fan rotor (11) around the central axis of the hub (12), and a hub (12 ) Is formed on the fan motor (15) side, and a part of the air sent radially outward from between the hub (12) and the shroud (13) is cooled by the cooling air (Wa) of the fan motor (15). A motor cooling flow path (50) leading to the periphery of the fan motor (15), and the hub (12) includes the motor cooling flow path (50) and the fan motor (15) of the hub (12). The cooling air outlet hole (12c) is opened to communicate the cooling air (Wa) that has cooled the fan motor (15) to the opposite side to the fan motor (15) of the hub (12). Pair the formed centrifugal fan As an elephant, it further comprises guide means for guiding the cooling air (Wa) derived from the cooling air outlet (12c) into the fan rotor (11), and the guide means comprises the fan motor of the hub (12). (15) projecting from the portion of the opening edge of the cooling air derivation hole (12c) on the opposite side to the rear side in the hub rotation direction on the opposite surface to the cooling air derivation hole (12c). A cooling air receiving portion (25a) that receives the cooling air that passes through and passes rearward in the rotation direction, and a base end portion is connected to the cooling air receiving portion (25a) and from the base end toward the front in the hub rotation direction. The cooling air formed so as to cover the entire rotation direction of the cooling air outlet port (12c) in the hub rotation direction and received by the cooling air receiving portion (25a) is rearward in the hub rotation direction. From the guide part (25b) that guides the flow toward the front side of the hub rotation direction from the guide part (25b) The cooling wind that is formed between the entire portion in the hub radial direction of the front end portion in the hub rotation direction and the opening edge portion of the cooling air outlet hole (12c) and is guided by the guide portion (25b). An opening portion (25c) for discharging into the fan rotor from the rear side in the hub rotation direction toward the front side in the hub rotation direction, and an inner end portion of the guide portion (25b) in the hub radial direction and a cooling air guide hole The space between the opening edge of (12c) is closed .

上記の構成により、冷却風(Wa)は、ガイド部(25b)によって該冷却風(Wa)の流れが逆向きにされて、ガイド部(25b)のハブ回転方向前側端部と冷却風導出孔(12c)のハブ回転方向前側の開口縁部との間の開放部(25c)からハブ(12)のファンモータ(15)と反対側へ導出されるようになり、これにより、冷却風(Wa)の流速が小さく抑えられる。また、冷却風(Wa)は、ファンロータ(11)内を流れる空気主流とは逆行して導出されものの、ハブ(12)のファンモータ(15)と反対側の面に沿って導出される。したがって、冷却風(Wa)と空気主流との干渉が抑制され、ハブカバーを設けないでも、ハブカバーを設けた場合と同じレベルにまで送風音を低減することができるようになる。一方、冷却風(Wa)の流速が小さく抑えられることで、ファンモータ(15)の冷却効果は低減する可能性があるものの、冷却効果は風速に比例するだけであるのに対し、送風音の大きさは風速の６乗に比例するので、冷却風(Wa)の流速が多少小さくなっても冷却効果には殆ど影響せず、送風音を効果的に低減することができる。   With the above configuration, the cooling air (Wa) is flown in the opposite direction by the guide portion (25b), and the front end portion of the guide portion (25b) in the hub rotation direction and the cooling air outlet hole From the opening (25c) between the opening edge of the front side of the hub rotation direction of (12c), it is led out to the opposite side of the fan motor (15) of the hub (12), thereby cooling air (Wa ) Is kept small. Further, the cooling air (Wa) is derived along the surface of the hub (12) opposite to the fan motor (15), although it is derived in the direction opposite to the main air flow flowing in the fan rotor (11). Therefore, the interference between the cooling air (Wa) and the main air flow is suppressed, and the blowing sound can be reduced to the same level as when the hub cover is provided without providing the hub cover. On the other hand, although the cooling effect of the fan motor (15) may be reduced by reducing the flow velocity of the cooling air (Wa), the cooling effect is only proportional to the wind speed, while Since the magnitude is proportional to the sixth power of the wind speed, even if the flow velocity of the cooling air (Wa) is somewhat reduced, the cooling effect is hardly affected, and the blowing sound can be effectively reduced.

第２の発明では、上記第１の発明において、ガイド部(25b)のハブ径方向外側端部と冷却風導出孔(12c)の開口縁部との間が開放されているものとする。 In the second invention, in the first invention, it is assumed that between the guide portion and the hub radially outer end of the (25b) and the opening edge portion of the cooling air outlet hole (12c) is open.

このことにより、冷却風(Wa)が、ガイド部(25b)のハブ回転方向前側端部と冷却風導出孔(12c)のハブ回転方向前側の開口縁部との間の開放部分から、ファンロータ(11)内を流れる空気主流と逆行して導出しようとするが、ハブ回転方向後側でかつハブ径方向外側へと流れる空気主流に引きずられて、該空気主流に沿うようにガイド部(25b)のハブ径方向外側端部と冷却風導出孔(12c)のハブ径方向外側の開口縁部との間の開放部分を通って、ハブ回転方向後側でかつハブ径方向外側へと流れる。この結果、冷却風(Wa)と空気主流との干渉がより一層良好に抑えられ、送風音をより一層低減することができる。   As a result, the cooling air (Wa) flows from the opening portion between the front end of the guide portion (25b) in the hub rotation direction and the opening edge of the cooling air outlet hole (12c) on the front side in the hub rotation direction. (11) An attempt is made to reverse the main flow of air flowing in the air, but it is dragged by the main air flow flowing rearward in the hub rotation direction and outward in the radial direction of the hub, so that the guide portion (25b ) Through the open portion between the outer end of the hub in the radial direction of the hub and the opening edge of the cooling air outlet hole (12c) at the outer side of the hub in the radial direction of the hub. As a result, the interference between the cooling air (Wa) and the main air flow can be further suppressed, and the blowing sound can be further reduced.

第３の発明では、上記第２の発明において、ガイド部(25b)は、冷却風導出孔(12c)のハブ径方向内側部分を覆っているものとする。   According to a third aspect, in the second aspect, the guide portion (25b) covers the hub radial direction inner portion of the cooling air outlet hole (12c).

こうすることで、ガイド部(25b)のハブ径方向外側端部と冷却風導出孔(12c)のハブ径方向外側の開口縁部との間の開放部分が比較的大きくなるため、該開放部分から、冷却風(Wa)が空気主流に沿ってハブ回転方向後側でかつハブ径方向外側へと流れ易くなる。よって、送風音の更なる低減化を図ることができる。   By doing so, the open portion between the outer end portion of the guide portion (25b) in the hub radial direction and the opening edge portion of the cooling air outlet hole (12c) on the outer side in the hub radial direction becomes relatively large. Therefore, the cooling air (Wa) easily flows along the main air flow to the rear side in the hub rotation direction and outward in the hub radial direction. Therefore, further reduction of the blowing sound can be achieved.

第４の発明では、上記第２又は３の発明において、ハブ(12)の中心部に、ファンモータ(15)と反対側へ略円錐状に突出する突出部(12a)が形成されており、冷却風導出孔(12c)は、上記ハブ(12)の突出部(12a)の円錐面に開口形成されているものとする。   In the fourth invention, in the second or third invention, the central portion of the hub (12) is formed with a projecting portion (12a) projecting in a substantially conical shape on the opposite side to the fan motor (15), It is assumed that the cooling air outlet hole (12c) is formed in the conical surface of the protrusion (12a) of the hub (12).

このような突出部(12a)に冷却風導出孔(12c)が形成されている場合、空気主流が、通常、この突出部(12a)に沿ってハブ径方向内側から外側へと流れるので、ガイド部(25b)のハブ径方向内側端部と冷却風導出孔(12c)のハブ径方向内側の開口縁部との間が開放されていると、その開放部分で冷却風(Wa)と空気主流との干渉が生じ易くなる。しかし、本発明では、ガイド部(25b)のハブ径方向内側端部と冷却風導出孔(12c)のハブ径方向内側の開口縁部との間が閉塞されているので、そのような干渉は生じず、送風音の低減化を効果的に図ることができる。また、ハブ(12)を樹脂で成形する場合、ガイド部(25b)のハブ径方向外側端部と冷却風導出孔(12c)のハブ径方向外側の開口縁部との間が開放されていると、ハブ(12)のファンモータ(15)側の成形型と、ファンモータ(15)と反対側の成形型との２分割型で、冷却風導出孔(12c)及びガイド部(25b)を突出部(12a)の円錐面に容易に一体成形することができる。   When the cooling air outlet hole (12c) is formed in such a protrusion (12a), the main air flow normally flows from the inside to the outside in the hub radial direction along the protrusion (12a). If the space between the inner end of the hub (25b) in the radial direction of the hub and the opening edge of the cooling air outlet hole (12c) on the inner side of the hub in the radial direction of the hub is open, the cooling air (Wa) Interference easily occurs. However, in the present invention, the gap between the inner end of the guide portion (25b) in the hub radial direction and the opening edge portion of the cooling air outlet hole (12c) on the inner side in the hub radial direction is closed. It does not occur, and it is possible to effectively reduce the blowing sound. Further, when the hub (12) is molded from resin, the gap between the outer end of the guide portion (25b) in the hub radial direction and the opening edge of the cooling air outlet hole (12c) on the outer side in the hub radial direction is open. The cooling air outlet hole (12c) and the guide part (25b) are divided into two parts: a mold on the fan motor (15) side of the hub (12) and a mold on the opposite side of the fan motor (15). It can be easily formed integrally with the conical surface of the protrusion (12a).

以上説明したように、本発明によると、ハブ(12)のファンモータ(15)と反対側の面における冷却風導出孔(12c)の開口縁部のうちハブ回転方向後側寄りの部分から突出する冷却風受け部(25a)を形成すると共に、該冷却風受け部(25a)からハブ回転方向前側へ延びるガイド部(25b)を形成するとともに、ガイド部(25b)のハブ回転方向前側端部と冷却風導出孔(12c)の開口縁部とに開放部(25c)を形成するようにしたことにより、冷却風(Wa)と空気主流との干渉を抑制して、ハブカバーを設けないでも、ハブカバーを設けた場合と同じレベルにまで送風音を低減することができる。   As described above, according to the present invention, of the opening edge portion of the cooling air outlet hole (12c) on the surface of the hub (12) opposite to the fan motor (15), it protrudes from the portion closer to the rear side in the hub rotation direction. Forming a cooling air receiving portion (25a), forming a guide portion (25b) extending from the cooling air receiving portion (25a) to the front side in the hub rotation direction, and a front end portion in the hub rotation direction of the guide portion (25b) And an opening edge (25c) at the opening edge of the cooling air outlet hole (12c), thereby suppressing interference between the cooling air (Wa) and the main air flow without providing a hub cover, The blowing sound can be reduced to the same level as when the hub cover is provided.

特に第２の発明では、ガイド部(25b)のハブ径方向内側端部と冷却風導出孔(12c)の開口縁部との間を閉塞する一方、ガイド部(25b)のハブ径方向外側端部と冷却風導出孔(12c)のハブ径方向外側の開口縁部との間、及び、ガイド部(25b)のハブ回転方向前側端部と冷却風導出孔(12c)の開口縁部との間を開放したので、冷却風(Wa)と空気主流との干渉がより一層良好に抑えられ、送風音をより一層低減することができる。   In particular, in the second invention, the gap between the inner end of the guide portion (25b) in the hub radial direction and the opening edge of the cooling air outlet hole (12c) is closed, while the outer end of the guide portion (25b) in the hub radial direction is closed. And the opening edge of the cooling air outlet hole (12c) on the outer side in the hub radial direction, and the front end of the guide part (25b) in the hub rotation direction and the opening edge of the cooling air outlet hole (12c). Since the space is opened, the interference between the cooling air (Wa) and the main air flow can be further suppressed and the blowing sound can be further reduced.

さらに、第３の発明では、ガイド部(25b)が冷却風導出孔(12c)のハブ径方向内側部分を覆うようにしたので、送風音の更なる低減化を図ることができる。   Furthermore, in the third aspect of the invention, since the guide portion (25b) covers the inner portion of the cooling air outlet hole (12c) in the hub radial direction, it is possible to further reduce the blowing sound.

また、第４の発明では、ハブ(12)の中心部に、ファンモータ(15)と反対側へ略円錐状に突出する突出部(12a)を形成し、冷却風導出孔(12c)を、上記ハブ(12)の突出部(12a)の円錐面に開口形成したので、冷却風導出孔(12c)及びガイド部(25b)を突出部(12a)の円錐面に容易に一体成形しつつ、送風音の低減化を効果的に図ることができる。   In the fourth invention, the central portion of the hub (12) is formed with a projecting portion (12a) projecting in a substantially conical shape on the opposite side to the fan motor (15), and the cooling air outlet hole (12c) is formed. Since the opening is formed in the conical surface of the projecting portion (12a) of the hub (12), the cooling air outlet hole (12c) and the guide portion (25b) are easily integrally formed on the conical surface of the projecting portion (12a), It is possible to effectively reduce the blowing sound.

以下、本発明の実施形態を図面に基づいて詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は、本発明の実施形態に係る遠心ファン(F)が搭載された天井埋込型空気調和装置を示し、この空気調和装置は、内部に各種構成機器を収納するケーシング(1)を備えている。このケーシング(1)は、ケーシング本体(1a)と、該ケーシング本体(1a)の下側に配置された化粧パネル(1b)とで構成されている。   FIG. 1 shows a ceiling-embedded air conditioner equipped with a centrifugal fan (F) according to an embodiment of the present invention. This air conditioner includes a casing (1) that houses various components therein. ing. The casing (1) includes a casing body (1a) and a decorative panel (1b) disposed on the lower side of the casing body (1a).

上記ケーシング本体(1a)は、下面が下方から見て略矩形状（４つの角部はＣ面取りされており、長辺と短辺とが交互に形成された略８角形状であるともいえる）に開口した箱状体であって、該開口が、空調室の天井壁(C)に形成された開口と対向するように、不図示の固定金具を介して該天井壁(C)に固定されている。   The casing body (1a) has a substantially rectangular shape when viewed from below (four corners are chamfered, and can be said to be an approximately octagonal shape in which long and short sides are alternately formed). A box-shaped body that is opened to the ceiling wall (C) via a fixing bracket (not shown) so that the opening faces the opening formed in the ceiling wall (C) of the air conditioning room. ing.

上記化粧パネル(1b)は、上記ケーシング本体(1a)の開口及び天井壁(C)の開口を覆うように、該ケーシング本体(1a)の下端部に固定されている。この化粧パネル(1b)は、下方から見て略矩形状の板状体であって、その略中央部に配設されかつ空調室内の空気を吸い込む吸込口(2)と、該化粧パネル(1b)の周縁部において４つの辺部にそれぞれ対応するように配設され、ケーシング本体(1a)内から空調室内に空気を吹き出す４つの吹出口(3)とを有している。上記吸込口(2)は、略正方形状の開口であり、各吹出口(3)は、それぞれ、各辺部に沿うように細長く延びる略長方形状の開口である。   The decorative panel (1b) is fixed to the lower end of the casing body (1a) so as to cover the opening of the casing body (1a) and the opening of the ceiling wall (C). The decorative panel (1b) is a substantially rectangular plate-like body as viewed from below, and is provided at the substantially central portion of the decorative panel (1b) and sucks air in the air-conditioned room, and the decorative panel (1b) ) And four outlets (3) for blowing air from the inside of the casing body (1a) into the air-conditioned room. The suction port (2) is a substantially square-shaped opening, and each air outlet (3) is a substantially rectangular-shaped opening that extends along each side.

上記吸込口(2)には、吸込グリル(4)と、該吸込口(2)から吸い込まれた空気中の塵埃を除去するためのフィルタ(5)とが設けられている。また、上記各吹出口(3)には、不図示のモータによって該吹出口(3)の長手方向に延びる軸周りに揺動されるフラップ(6)がそれぞれ設けられており、このフラップ(6)の揺動により、吹出口(3)から空調室内へ吹き出される空気の風向を可変することができるようになっている。   The suction port (2) is provided with a suction grill (4) and a filter (5) for removing dust in the air sucked from the suction port (2). Each of the air outlets (3) is provided with a flap (6) that is swung around an axis extending in the longitudinal direction of the air outlet (3) by a motor (not shown). ) Can be varied to change the air direction of the air blown from the air outlet (3) into the air-conditioned room.

上記ケーシング本体(1a)の内部には、主に、空調室内の空気を上記吸込口(2)を通じてケーシング本体(1a)内に吸い込んで外周方向に吹き出す送風機として機能する遠心ファン(F)と、この遠心ファン(F)の外周を囲むように配置された略環状の熱交換器(8)とが設けられている。   In the inside of the casing body (1a), mainly, a centrifugal fan (F) that functions as a blower that sucks air in the air-conditioned room into the casing body (1a) through the suction port (2) and blows it in the outer peripheral direction, A substantially annular heat exchanger (8) is provided so as to surround the outer periphery of the centrifugal fan (F).

上記遠心ファン(F)は、ターボファンであって、互いに上下方向に対向配置された円形のハブ(12)及びシュラウド(13)の外周部間に、複数（本実施形態では、７枚）の断面翼形の羽根(14)を周方向に等間隔に架設してなるファンロータ(11)と、該ハブ(12)のシュラウド(13)とは反対側に配設され、該ファンロータ(11)をハブ(12)の中心軸（シュラウド(13)の中心軸でもあり、ファンロータ(11)の中心軸でもある）周りに回転駆動するためのファンモータ(15)とを備えている。上記ハブ(12)、シュラウド(13)及び羽根(14)は全て樹脂製である。   The centrifugal fan (F) is a turbo fan, and a plurality (seven in this embodiment) of outer peripheral portions of a circular hub (12) and a shroud (13) that are arranged to face each other in the vertical direction. A fan rotor (11) in which blades (14) having an airfoil cross section are installed at equal intervals in the circumferential direction, and the fan rotor (11) are disposed on the opposite side of the shroud (13) of the hub (12). ) Around a central axis of the hub (12) (which is also a central axis of the shroud (13) and a central axis of the fan rotor (11)) and a fan motor (15). The hub (12), shroud (13) and blade (14) are all made of resin.

上記ハブ(12)の中心部には、ファンモータ(15)と反対側（下側）へ略円錐状に突出する突出部(12a)が形成されている。この突出部(12a)の形成により、ハブ(12)の中心部のファンモータ(15)側の面（上面）は、略円錐状に凹むことになり、この凹んだ上面と上記ケーシング本体(1a)内の上面との間に、ファンモータ(15)の収容空間が形成されることになる。そして、上記突出部(12a)の先端（下端）には、円柱状のボス部(12b)が一体形成されており、このボス部(12b)の中心（ハブ(12)の中心に相当）にファンモータ(15)の駆動軸が連結されている。これにより、ファンロータ(11)がファンモータ(15)によってハブ(12)の中心軸周りに回転駆動されることになる。   A projecting portion (12a) projecting in a substantially conical shape to the opposite side (lower side) of the fan motor (15) is formed at the center of the hub (12). Due to the formation of the projecting portion (12a), the surface (upper surface) on the fan motor (15) side of the central portion of the hub (12) is recessed in a substantially conical shape, and the recessed upper surface and the casing body (1a A space for accommodating the fan motor (15) is formed between the upper surface in the bracket). A cylindrical boss portion (12b) is integrally formed at the tip (lower end) of the protruding portion (12a), and the center of the boss portion (12b) (corresponding to the center of the hub (12)). The drive shaft of the fan motor (15) is connected. As a result, the fan rotor (11) is rotationally driven around the central axis of the hub (12) by the fan motor (15).

上記シュラウド(13)は、中心部に空気導入開口(13a)を有していて、上記ハブ(12)との間に、上記吸込口(2)より吸い込んだ空気を空気導入開口(13a)からファンロータ(11)の外周側へ、つまり熱交換器(8)の方向へ向って案内する空気通路(18)を形成する。尚、シュラウド(13)の空気導入開口(13a)の下側（吸込口(2)側）には、吸込口(2)から吸い込まれた空気を空気導入開口(13a)へ案内するためのベルマウス(20)が配置されている。   The shroud (13) has an air introduction opening (13a) at the center, and air sucked from the suction opening (2) between the air introduction opening (13a) and the hub (12). An air passage (18) that guides toward the outer peripheral side of the fan rotor (11), that is, toward the heat exchanger (8) is formed. A bell for guiding the air sucked from the suction port (2) to the air introduction opening (13a) is located below the air introduction opening (13a) of the shroud (13) (on the suction port (2) side). A mouse (20) is placed.

上記熱交換器(8)は、遠心ファン(F)の外周を囲むように曲げられて形成されたクロスフィンチューブ型の熱交換器パネルであり、屋外等に設置された不図示の室外ユニットに冷媒配管を介して接続されている。この熱交換器(8)は、冷房運転時には内部を流れる冷媒の蒸発器として、暖房運転時には内部を流れる冷媒の凝縮器としてそれぞれ機能できるようになっている。これにより、熱交換器(8)は、吸込口(2)を通じてケーシング本体(1a)内に吸い込まれかつ遠心ファン(F)のファンロータ(11)から吹き出された空気と熱交換を行って、冷房運転時には空気を冷却し、暖房運転時には空気を加熱することができる。尚、熱交換器(8)の下側には、該熱交換器(8)において空気中の水分が凝縮されて生じるドレン水を受けるためのドレンパン(22)が配置されている。   The heat exchanger (8) is a cross fin tube type heat exchanger panel formed by being bent so as to surround the outer periphery of the centrifugal fan (F), and is attached to an outdoor unit (not shown) installed outdoors. It is connected via refrigerant piping. The heat exchanger (8) can function as a refrigerant evaporator flowing inside during the cooling operation and as a refrigerant condenser flowing inside during the heating operation. Thereby, the heat exchanger (8) exchanges heat with the air sucked into the casing body (1a) through the suction port (2) and blown out from the fan rotor (11) of the centrifugal fan (F), Air can be cooled during cooling operation, and air can be heated during heating operation. A drain pan (22) for receiving drain water generated by condensation of moisture in the air in the heat exchanger (8) is disposed below the heat exchanger (8).

上記遠心ファン(F)のファンロータ(11)におけるハブ(12)の突出部(12a)の円錐面には、図２にも示すように、ファンモータ(15)を冷却した冷却風(Wa)を該ハブ(12)のファンモータ(15)と反対側へ導出するための複数（本実施形態では、５つ）の略矩形状の冷却風導出孔(12c)が、周方向に等間隔に開口形成されている。すなわち、これら冷却風導出孔(12c)の形成により、ハブ(12)の中心近傍と径方向外側との圧力差によって、ファンロータ(11)から吹き出された空気の一部が、ハブ(12)のファンモータ(15)側に回り込んで冷却風導出孔(12c)からハブ(12)のファンモータ(15)と反対側へ導出するようになる。このハブ(12)のファンモータ(15)側に回り込む空気が、冷却風(Wa)としてファンモータ(15)を冷却し、この冷却風(Wa)が冷却風導出孔(12c)からハブのファンモータ(15)と反対側へ導出することになる。   On the conical surface of the protrusion (12a) of the hub (12) in the fan rotor (11) of the centrifugal fan (F), as shown in FIG. 2, the cooling air (Wa) for cooling the fan motor (15) is provided. A plurality (five in this embodiment) of substantially rectangular cooling air outlet holes (12c) for guiding the air to the opposite side of the fan motor (15) of the hub (12) are arranged at equal intervals in the circumferential direction. An opening is formed. That is, due to the formation of these cooling air outlet holes (12c), a part of the air blown out from the fan rotor (11) due to the pressure difference between the center vicinity of the hub (12) and the radially outer side, the hub (12) Then, the air flows into the fan motor (15) side and is led out from the cooling air outlet hole (12c) to the side opposite to the fan motor (15) of the hub (12). The air that circulates toward the fan motor (15) side of the hub (12) cools the fan motor (15) as cooling air (Wa), and this cooling air (Wa) passes from the cooling air outlet hole (12c) to the fan of the hub. It leads to the opposite side to the motor (15).

上記ハブ(12)の上記ファンモータ(15)と反対側の面における上記各冷却風導出孔(12c)のハブ回転方向後側の開口縁部には、該開口縁部からハブ回転方向前側へ延びるガイド片(25)が一体形成されている。具体的には、このガイド片(25)は、上記冷却風導出孔(12c)のハブ回転方向後側の開口縁部におけるハブ径方向内側部分（円錐先端側部分）から僅かにファンモータ(15)と反対側に延びた後にハブ回転方向前側へ延びて断面略Ｌ字状をなし、そのハブ回転方向前側端は、当該冷却風導出孔(12c)のハブ回転方向前側の開口縁よりも僅かにハブ回転方向後側に位置しており、ガイド片(25)のハブ回転方向前側端部と冷却風導出孔(12c)のハブ回転方向前側の開口縁部との間は開放されている。このように、ガイド片(25)は、冷却風導出孔(12c)のハブ径方向内側部分をファンモータ(15)と反対側から覆っているが、冷却風導出孔(12c)のハブ径方向外側部分（円錐先端と反対側部分）は、ガイド片(25)によって覆われておらず、このため、ガイド片(25)のハブ径方向外側端部と冷却風導出孔(12c)のハブ径方向外側の開口縁部との間も開放されていることになる。一方、ガイド片(25)のハブ径方向内側端部と冷却風導出孔(12c)のハブ径方向内側の開口縁部との間は、ガイド片(25)のハブ径方向内側端部が冷却風導出孔(12c)のハブ径方向内側の開口縁部と繋がっているために閉塞されている。尚、ガイド片(25)のハブ回転方向後側端部と冷却風導出孔(12c)のハブ回転方向後側の開口縁部との間も、ガイド片(25)のハブ回転方向後側端部と冷却風導出孔(12c)のハブ回転方向後側の開口縁部とが繋がっているために閉塞されていることになる。   The opening edge on the rear side in the hub rotation direction of each cooling air outlet hole (12c) on the surface opposite to the fan motor (15) of the hub (12) is from the opening edge to the front side in the hub rotation direction. An extending guide piece (25) is integrally formed. Specifically, the guide piece (25) is slightly fan motor (15) from the hub radial inner portion (conical tip side portion) at the opening edge of the cooling air outlet hole (12c) on the rear side in the hub rotation direction. ) To the front side of the hub rotation direction, and has a substantially L-shaped cross section. The front end of the hub rotation direction is slightly smaller than the opening edge of the cooling air outlet hole (12c) on the front side of the hub rotation direction. The front end of the guide piece (25) in the hub rotation direction and the opening edge of the cooling air outlet hole (12c) on the front side in the hub rotation direction are open. Thus, the guide piece (25) covers the hub radial direction inner part of the cooling air outlet hole (12c) from the side opposite to the fan motor (15), but the hub part of the cooling air outlet hole (12c) in the hub radial direction. The outer part (the part opposite to the tip of the cone) is not covered by the guide piece (25). For this reason, the hub diameter direction outer end of the guide piece (25) and the hub diameter of the cooling air outlet hole (12c) The opening edge portion on the outer side in the direction is also opened. On the other hand, the hub radial inner end of the guide piece (25) is cooled between the hub radial inner end of the guide piece (25) and the opening edge of the cooling air outlet hole (12c) on the hub radial inner side. Since it is connected to the opening edge of the wind outlet hole (12c) on the inner side in the hub radial direction, it is blocked. Note that the rear end of the guide piece (25) in the hub rotation direction is also between the rear end of the guide piece (25) in the hub rotation direction and the opening edge of the cooling air outlet hole (12c) on the rear side in the hub rotation direction. And the opening edge portion of the cooling air outlet hole (12c) on the rear side in the hub rotation direction are connected to each other and are thus closed.

上記のようなガイド片(25)の形状であれば、ハブ(12)のファンモータ(15)側の成形型と、ファンモータ(15)と反対側の成形型との２分割型で、冷却風導出孔(12c)及びガイド片(25)を突出部(12a)の円錐面に容易に一体成形することができる。   If the shape of the guide piece (25) is as described above, it is a two-part mold consisting of a mold on the fan motor (15) side of the hub (12) and a mold on the opposite side of the fan motor (15). The wind guide hole (12c) and the guide piece (25) can be easily formed integrally with the conical surface of the protrusion (12a).

次に、上記空気調和装置の動作について説明する。   Next, the operation of the air conditioner will be described.

空気調和装置の運転を開始すると、遠心ファン(F)のファンモータ(15)が駆動されて、ファンロータ(11)がハブ(12)の中心軸周りに回転する。また、熱交換器(8)内に室外ユニットから冷媒が供給されて、熱交換器(8)は冷房運転時には蒸発器として、暖房運転時には凝縮器としてそれぞれ作用する。そして、ファンロータ(11)の回転に伴って、空調室内の空気が、吸込口(2)からフィルタ(5)及びベルマウス(20)並びにシュラウド(13)の空気導入開口(13a)を通じてファンロータ(15)の空気通路(18)へと吸い込まれる。この吸い込まれた空気は、空気通路(18)内をハブ径方向外側へ向かって流れるとともに、ハブ(12)の回転によりハブ(12)に対して回転方向後側へ流れることになる。この空気通路(18)内を流れる空気（以下、空気主流(Wb)という）は、羽根(14)によってファンロータ(15)の外周側へ吹き出されて熱交換器(8)に達し、この熱交換器(8)において冷却又は加熱された後、吹出口(3)から空調室内に向かって吹き出される。このようにして、空調室内の冷房又は暖房が行われる。   When the operation of the air conditioner is started, the fan motor (15) of the centrifugal fan (F) is driven, and the fan rotor (11) rotates around the central axis of the hub (12). In addition, refrigerant is supplied from the outdoor unit into the heat exchanger (8), and the heat exchanger (8) functions as an evaporator during the cooling operation and as a condenser during the heating operation. As the fan rotor (11) rotates, the air in the air-conditioned room passes through the air inlet opening (13a) of the filter (5), the bell mouth (20), and the shroud (13) from the suction port (2). It is sucked into the air passage (18) of (15). The sucked air flows in the air passage (18) toward the outer side in the hub radial direction, and flows to the rear side in the rotation direction with respect to the hub (12) by the rotation of the hub (12). The air flowing in the air passage (18) (hereinafter referred to as air main flow (Wb)) is blown out to the outer peripheral side of the fan rotor (15) by the blades (14) and reaches the heat exchanger (8). After being cooled or heated in the exchanger (8), the air is blown out from the air outlet (3) toward the air-conditioned room. In this way, cooling or heating in the air-conditioned room is performed.

ここで、上記ファンロータ(15)から吹き出された空気の一部は、ハブ(12)のファンモータ(15)側に回り込んで冷却風(Wa)となってファンモータ(15)を冷却し、このファンモータ(15)を冷却した冷却風(Wa)がハブ(12)の各冷却風導出孔(12c)からハブ(12)のファンモータ(15)と反対側へ導出する。この冷却風(Wa)は、ハブ径方向外側から内側に向かって流れるとともに、ハブ(12)の回転によりハブ(12)に対して回転方向後側へ流れることになる。そして、ハブ(12)のファンモータ(15)と反対側の面における各冷却風導出孔(12c)のハブ回転方向後側の開口縁部には、該開口縁部からハブ回転方向前側へ延びるガイド片(25)が設けられているとともに、ガイド片(25)のハブ回転方向前側端部と冷却風導出孔(12c)のハブ回転方向前側の開口縁部との間が開放されているので、冷却風(Wa)は、図３に示すように、ガイド片(25)によってその冷却風(Wa)の流れが逆向きにされて、該開放部分からハブ(12)のファンモータ(15)と反対側へ導出しようとする。これにより、冷却風(Wa)の流速が小さく抑えられる。   Here, a part of the air blown out from the fan rotor (15) circulates toward the fan motor (15) side of the hub (12) and becomes cooling air (Wa) to cool the fan motor (15). Then, the cooling air (Wa) that has cooled the fan motor (15) is led out from each cooling air lead-out hole (12c) of the hub (12) to the opposite side of the fan motor (15) of the hub (12). The cooling air (Wa) flows from the outer side in the hub radial direction toward the inner side, and also flows backward in the rotational direction with respect to the hub (12) by the rotation of the hub (12). And, the opening edge on the rear side in the hub rotation direction of each cooling air outlet hole (12c) on the surface of the hub (12) opposite to the fan motor (15) extends from the opening edge to the front side in the hub rotation direction. A guide piece (25) is provided, and the gap between the front end of the guide piece (25) in the hub rotation direction and the opening edge of the cooling air outlet hole (12c) in the hub rotation direction is open. As shown in FIG. 3, the cooling air (Wa) is reversed by the guide piece (25), and the fan motor (15) of the hub (12) is opened from the open portion. And try to derive to the other side. As a result, the flow rate of the cooling air (Wa) can be kept small.

また、冷却風(Wa)は、ガイド片(25)のハブ回転方向前側端部と冷却風導出孔(12c)のハブ回転方向前側の開口縁部との間の開放部分から、ファンロータ(11)内を流れる空気主流(Wb)とは逆行して導出しようとするが、ガイド片(25)のハブ径方向外側端部と冷却風導出孔(12c)のハブ径方向外側の開口縁部との間が開放されているので、ハブ回転方向後側でかつハブ径方向外側へと流れる空気主流(Wb)に引きずられて、該空気主流(Wb)に沿うように、その開放部分からハブ回転方向後側でかつハブ径方向外側へと流れるようになる。このとき、冷却風導出孔(12c)のハブ径方向外側部分がガイド片(25)によって覆われていなくて、ガイド片(25)のハブ径方向外側端部と冷却風導出孔(12c)のハブ径方向外側の開口縁部との間の開放部分が比較的大きくなっているので、該開放部分から、冷却風(Wa)が空気主流(Wb)に沿ってハブ回転方向後側でかつハブ径方向外側へとより一層流れ易くなる。   Further, the cooling air (Wa) flows from the opening portion between the front end of the guide piece (25) in the hub rotation direction and the opening edge of the cooling air outlet hole (12c) on the front side in the hub rotation direction. ) Trying to derive the air flow (Wb) flowing in the reverse direction, but the outer end of the guide piece (25) in the hub radial direction and the opening edge of the cooling air outlet hole (12c) on the outer side of the hub radial direction. Since the gap is open, it is dragged by the main air flow (Wb) that flows rearward in the hub rotation direction and outward in the radial direction of the hub, so that the hub rotation from the open portion follows the main air flow (Wb). It flows in the rear side of the direction and outward in the radial direction of the hub. At this time, the hub radial direction outer portion of the cooling air outlet hole (12c) is not covered by the guide piece (25), and the hub radial direction outer end portion of the guide piece (25) and the cooling air outlet hole (12c) Since the open part between the opening edge part on the outer side in the hub radial direction is relatively large, the cooling air (Wa) from the open part is rearward in the hub rotation direction along the main air flow (Wb) and the hub. It becomes easier to flow radially outward.

したがって、冷却風(Wa)と空気主流(Wb)との干渉が効果的に抑制されて、ハブカバーを設けなくても、ハブカバーを設けた場合と同じレベルにまで送風音を低減することができるようになる。一方、冷却風(Wa)の流速が小さく抑えられることで、ファンモータ(15)の冷却効果は低減する可能性があるものの、冷却効果は風速に比例するだけであるのに対し、送風音の大きさは風速の６乗に比例するので、冷却風(Wa)の流速が多少小さくなっても冷却効果には殆ど影響せず、送風音を効果的に低減することができる。   Therefore, the interference between the cooling air (Wa) and the main air flow (Wb) is effectively suppressed, and the blowing sound can be reduced to the same level as when the hub cover is provided without providing the hub cover. become. On the other hand, although the cooling effect of the fan motor (15) may be reduced by reducing the flow velocity of the cooling air (Wa), the cooling effect is only proportional to the wind speed, while Since the magnitude is proportional to the sixth power of the wind speed, even if the flow velocity of the cooling air (Wa) is somewhat reduced, the cooling effect is hardly affected, and the blowing sound can be effectively reduced.

尚、上記実施形態では、ガイド片(25)を、冷却風導出孔(12c)のハブ径方向内側部分のみを覆う構成としたが、冷却風導出孔(12C)の略全体を覆う構成や、冷却風導出孔(12c)のハブ径方向外側部分のみを覆う構成としてもよい。また、ガイド片(25)のハブ径方向内側端部と冷却風導出孔(12c)のハブ径方向内側の開口縁部との間が、必ずしも閉塞されている必要はなく、開放されていてもよい。逆に、ガイド片(25)のハブ径方向外側端部と冷却風導出孔(12c)のハブ径方向外側の開口縁部との間が開放されている必要はなく、閉塞されていてもよい。要するに、ガイド片(25)のハブ回転方向前側端部と冷却風導出孔(12c)のハブ回転方向前側の開口縁部との間が開放されていればよく、このようにすれば、冷却風(Wa)の流速を小さく抑えることができるとともに、冷却風(Wa)がハブ(12)のファンモータ(15)と反対側の面に沿って導出されるので、ハブカバーを設けた場合と同じレベルにまで送風音を低減することができる。但し、送風音をより低減するという観点からは、上記実施形態のように、ガイド片(25)のハブ径方向内側端部と冷却風導出孔(12c)のハブ径方向内側の開口縁部との間が閉塞され、ガイド片(25)のハブ径方向外側端部と冷却風導出孔(12c)のハブ径方向外側の開口縁部との間が開放されている構成が好ましい。   In the above-described embodiment, the guide piece (25) is configured to cover only the hub radial direction inner portion of the cooling air derivation hole (12c), but the configuration covering substantially the entire cooling air derivation hole (12C), The cooling air outlet hole (12c) may be configured to cover only the outer portion in the hub radial direction. In addition, the gap between the inner end of the guide piece (25) in the radial direction of the hub and the opening edge of the cooling air outlet hole (12c) on the inner side of the hub in the radial direction of the hub does not necessarily have to be closed. Good. Conversely, the gap between the outer end of the guide piece (25) in the radial direction of the hub and the opening edge of the cooling air outlet hole (12c) on the outer side of the hub in the radial direction of the hub is not necessarily open and may be closed. . In short, it suffices that the gap between the front end of the guide piece (25) in the hub rotation direction and the opening edge of the cooling air outlet hole (12c) on the front side in the hub rotation direction is open. The flow rate of (Wa) can be kept small, and the cooling air (Wa) is led out along the surface of the hub (12) opposite to the fan motor (15), so the same level as when the hub cover is provided It is possible to reduce the blowing noise. However, from the viewpoint of further reducing the blowing sound, as in the above embodiment, the hub radial direction inner end portion of the guide piece (25) and the opening edge portion of the cooling air outlet hole (12c) on the hub radial direction inner side. It is preferable that the gap is closed and the gap between the outer end of the guide piece (25) in the hub radial direction and the opening edge of the cooling air outlet hole (12c) on the outer side of the hub radial direction is open.

また、上記実施形態では、冷却風導出孔(12c)は略矩形状としているが、円形状や楕円形状を初め、どのような形状であってもよい。   In the above embodiment, the cooling air outlet hole (12c) has a substantially rectangular shape, but may have any shape including a circular shape and an elliptical shape.

さらに、本発明は、空気調和装置の送風機に用いられるターボファンに適用した例を示したが、本発明は、ターボファンやシロッコファン等の遠心ファンであれば、どのようなものにも適用することができる。   Furthermore, although the present invention has been shown as an example applied to a turbo fan used in a blower of an air conditioner, the present invention is applicable to any centrifugal fan such as a turbo fan or a sirocco fan. be able to.

本発明は、空気調和装置の送風機等に用いられるターボファン等の遠心ファンに有用である。   INDUSTRIAL APPLICABILITY The present invention is useful for a centrifugal fan such as a turbo fan used for a blower of an air conditioner.

本発明の実施形態に係る遠心ファンが搭載された天井埋込型空気調和装置を示す断面図である。1 is a cross-sectional view showing a ceiling-embedded air conditioner equipped with a centrifugal fan according to an embodiment of the present invention. 遠心ファンのハブの突出部を拡大して示すシュラウド側から見た斜視図である。It is the perspective view seen from the shroud side which expands and shows the protrusion part of the hub of a centrifugal fan. 図２のIII-III線断面図である。It is the III-III sectional view taken on the line of FIG.

Ｆ 遠心ファン
Ｗａ 冷却風
１１ ファンロータ
１２ ハブ
１２ａ 突出部
１２ｃ ボス部
１３ シュラウド
１４ 羽根
１５ ファンモータ
２５ ガイド片（ガイド手段）
２５ａ 冷却風受け部（ガイド手段）
２５ｂ ガイド部（ガイド手段）
２５ｃ 開放部（ガイド手段） F Centrifugal fan Wa Cooling air 11 Fan rotor 12 Hub 12a Protruding part 12c Boss part 13 Shroud 14 Blade 15 Fan motor 25 Guide piece (guide means)
25a Cooling air receiving part (guide means)
25b Guide part (guide means)
25c Opening part (guide means)

Claims (4)

互いに対向配置されたハブ(12)及びシュラウド(13)の外周部間に羽根(14)を架設してなるファンロータ(11)と、該ハブ(12)のシュラウド(13)とは反対側に配設され、該ファンロータ(11)をハブ(12)の中心軸周りに回転駆動するためのファンモータ(15)と、ハブ(12)のファンモータ(15)側に形成され、該ハブ(12)とシュラウド(13)との間から径方向外側に送出される風の一部を、ファンモータ(15)の冷却風(Wa)としてファンモータ(15)の周辺に導くモータ冷却流路(50)と、を備え、上記ハブ(12)には、該モータ冷却流路(50)とハブ（12）のファンモータ(15)と反対側とを連通して、該ファンモータ(15)を冷却した冷却風(Wa)をハブ(12)のファンモータ(15)と反対側へ導出するための冷却風導出孔(12c)が開口形成された遠心ファンであって、
上記冷却風導出口(12c)から導出された冷却風(Wa)をファンロータ(11)内に案内するガイド手段をさらに備え、
上記ガイド手段は、
上記ハブ(12)の上記ファンモータ(15)と反対側の面における上記冷却風導出孔(12c)の開口縁部のうちハブ回転方向後側寄りに位置する部分から突出し、該ハブの回転により該冷却風導出口(12c)を通過して回転方向後側に向かう冷却風を受け止める冷却風受け部(25a)と、
基端部が上記冷却風受け部(25a)に接続されると共に該基端部からハブ回転方向前側に向かって延びてハブ回転方向において冷却風導出口(12c)の該回転方向の全体を覆うように形成され、上記冷却風受け部(25a)にて受け止められた冷却風を上記ハブ回転方向後側からハブ回転方向前側に向かって流動案内するガイド部(25b)と、
上記ガイド部(25b)におけるハブ回転方向前側端部のハブ径方向の全体に亘る部分と上記冷却風導出孔(12c)の開口縁部との間に形成され、上記ガイド部(25b)によって流動案内された冷却風を、ハブ回転方向後側からハブ回転方向前側に向かってファンロータ内に排出するための開放部(25c)と、
を有し、
ガイド部(25b)のハブ径方向内側端部と冷却風導出孔(12c)の開口縁部との間が閉塞されていることを特徴とする遠心ファン。 A fan rotor (11) in which blades (14) are installed between the outer peripheral portions of the hub (12) and the shroud (13) arranged opposite to each other, and the hub (12) on the opposite side to the shroud (13). A fan motor (15) for rotationally driving the fan rotor (11) around the central axis of the hub (12), and formed on the fan motor (15) side of the hub (12). 12) A motor cooling flow path that guides a part of the air sent radially outward from between the shroud (13) to the periphery of the fan motor (15) as cooling air (Wa) of the fan motor (15). 50), and the hub (12) communicates with the motor cooling flow path (50) and the opposite side of the hub (12) to the fan motor (15), and the fan motor (15) is connected to the hub (12). A centrifugal fan in which a cooling air outlet hole (12c) for leading the cooled cooling air (Wa) to the opposite side of the fan motor (15) of the hub (12) is formed,
Further comprising guide means for guiding the cooling air (Wa) derived from the cooling air outlet (12c) into the fan rotor (11),
The guide means is
Projecting from the portion of the opening edge of the cooling air outlet hole (12c) on the opposite side of the fan motor (15) of the hub (12) to the rear side in the hub rotation direction, the rotation of the hub A cooling air receiving portion (25a) that receives the cooling air that passes through the cooling air outlet (12c) and travels backward in the rotational direction;
Cover the entire of the rotational direction of the cooling air outlet (12c) in the hub rotation direction base end extends toward the hub rotation direction front side from the base end portion is connected to said cooling air receiving portion (25a) A guide portion (25b) that is formed as described above and guides the cooling air received by the cooling air receiving portion (25a) from the rear side in the hub rotation direction toward the front side in the hub rotation direction;
The guide portion (25b) is formed between the entire portion in the hub radial direction of the front end portion in the hub rotation direction and the opening edge portion of the cooling air outlet hole (12c), and flows by the guide portion (25b). An opening (25c) for discharging the guided cooling air into the fan rotor from the rear side in the hub rotation direction toward the front side in the hub rotation direction;
Have,
A centrifugal fan characterized in that a space between an inner end portion in the hub radial direction of the guide portion (25b) and an opening edge portion of the cooling air outlet hole (12c) is closed . 請求項１記載の遠心ファンにおいて、
ガイド部(25b)のハブ径方向外側端部と冷却風導出孔(12c)の開口縁部との間が開放されていることを特徴とする遠心ファン。 The centrifugal fan according to claim 1 , wherein
Centrifugal fan, wherein a guide portion between the opening edge portion of the hub radially outer end of the (25b) and the cooling air outlet hole (12c) is open. 請求項２記載の遠心ファンにおいて、
ガイド部(25b)は、冷却風導出孔(12c)のハブ径方向内側部分を覆っていることを特徴とする遠心ファン。 The centrifugal fan according to claim 2, wherein
The centrifugal fan characterized in that the guide portion (25b) covers the hub radial direction inner portion of the cooling air outlet hole (12c). 請求項２又は３記載の遠心ファンにおいて、
ハブ(12)の中心部に、ファンモータ(15)と反対側へ略円錐状に突出する突出部(12a)が形成されており、
冷却風導出孔(12c)は、上記ハブ(12)の突出部(12a)の円錐面に開口形成されていることを特徴とする遠心ファン。 The centrifugal fan according to claim 2 or 3,
At the center of the hub (12), a projecting portion (12a) projecting in a substantially conical shape to the opposite side of the fan motor (15) is formed,
The centrifugal fan, wherein the cooling air outlet hole (12c) is formed in the conical surface of the protrusion (12a) of the hub (12).
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