JP2009019576A - Propeller fan - Google Patents

Propeller fan Download PDF

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JP2009019576A
JP2009019576A JP2007183039A JP2007183039A JP2009019576A JP 2009019576 A JP2009019576 A JP 2009019576A JP 2007183039 A JP2007183039 A JP 2007183039A JP 2007183039 A JP2007183039 A JP 2007183039A JP 2009019576 A JP2009019576 A JP 2009019576A
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Prior art keywords
blade
pressure surface
peripheral side
outer peripheral
hub
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Shimei Tei
志明 鄭
Masaru Nakagawa
優 中川
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Daikin Industries Ltd
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Daikin Industries Ltd
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Priority to JP2007183039A priority Critical patent/JP2009019576A/en
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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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/307—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the tip of a rotor blade

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

Abstract

<P>PROBLEM TO BE SOLVED: To attain high efficiency of a fan by effectively restraining a leaking stream from a pressure surface side to a negative pressure surface side of the fan. <P>SOLUTION: A propeller fan is provided with: an impeller 1 composed of a hub 4 connected with a fan motor 3 as a driving source and a plurality of blades 5, 5... arranged on the outer periphery of the hub 4 in a radial direction; and a bell-mouth 2 arranged at an outer peripheral side of the impeller 1. Ribs 6 for restraining the leaking stream from the pressure surface 5a to the negative pressure surface 5b in the vicinity of a rear edge 5e of each blade 5, are formed along the outer periphery of the blade 5 on an outer peripheral side of the pressure surface 5a of each blade 5, and an air stream from a hub 4 side to the outer peripheral side at the pressure surface 5a side of the blade 5 is made hardly flow in a range overlapped with the bell mouth 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本願発明は、プロペラファンに関し、さらに詳しくは羽根の圧力面側から羽根の負圧面側への気流漏れを抑制することにより、翼端渦の成長を抑制し得るようにしたプロペラファンに関するものである。   The present invention relates to a propeller fan, and more particularly to a propeller fan capable of suppressing the growth of a blade tip vortex by suppressing airflow leakage from the blade pressure surface side to the blade suction surface side. .

プロペラファンは、図６および図７に示すように、駆動源であるファンモータ３に連結されるハブ４と、該ハブ４の外周に放射状に設けられた複数の羽根５，５・・とからなる羽根車１と該羽根車１の外周側に配設されたベルマウス２とによって構成されている。   As shown in FIGS. 6 and 7, the propeller fan includes a hub 4 connected to a fan motor 3 that is a driving source, and a plurality of blades 5, 5... Radially provided on the outer periphery of the hub 4. An impeller 1 and a bell mouth 2 disposed on the outer peripheral side of the impeller 1.

上記構成のプロペラファンにおいては、図８に示すように、各羽根５の外周側の翼端５ｃにおいて翼端渦Ｅが形成される。また、羽根車１とベルマウス２とがオーバーラップの範囲（即ち、各羽根５の翼端５ｃにおける後縁側）において、羽根５の圧力面５ａ側から負圧面５ｂ側に漏れる漏れ気流Ｅ′が生ずるが、該漏れ気流Ｅ′が前記翼端渦Ｅと合流して、翼端渦Ｅの成長を促すという不具合が生じていた。プロペラファンの送風機能にとって、翼端渦Ｅは不必要なものであり、翼端渦Ｅによって、圧力損失が発生し、ファン効率の低下を招く。また、羽根５の圧力面５ａ側から負圧面５ｂ側への漏れ気流Ｅ′は、明らかにプロペラファンにとって損失となり、ファン効率の低下を招く。   In the propeller fan configured as described above, a blade tip vortex E is formed at the blade tip 5c on the outer peripheral side of each blade 5, as shown in FIG. Further, in a range where the impeller 1 and the bell mouth 2 overlap (that is, the rear edge side of the blade tip 5c of each blade 5), a leakage air flow E 'leaking from the pressure surface 5a side of the blade 5 to the negative pressure surface 5b side is generated. However, there is a problem that the leaked airflow E ′ joins with the blade tip vortex E to promote the growth of the blade tip vortex E. The blade tip vortex E is unnecessary for the air blowing function of the propeller fan, and the blade tip vortex E causes a pressure loss, leading to a decrease in fan efficiency. Further, the leakage air flow E ′ from the pressure surface 5a side to the negative pressure surface 5b side of the blade 5 is obviously a loss for the propeller fan and causes a decrease in fan efficiency.

上記のような不具合に対処するものとして、図９に示すように、ベルマウス２に囲まれていない羽根５の外周端部（即ち、翼端５ｃ）の圧力面側に羽根５の吸込側から吐出側にかけて順次高さが高くなる板状のリブ８を取り付けたものが提案されている（特許文献１参照）。   As a countermeasure against the above-described problems, as shown in FIG. 9, from the suction side of the blade 5 to the pressure surface side of the outer peripheral end portion (that is, the blade tip 5 c) of the blade 5 not surrounded by the bell mouth 2. There has been proposed a structure in which plate-like ribs 8 whose height is gradually increased toward the discharge side (see Patent Document 1).

特開平５−４４６９５号公報。JP-A-5-44695.

ところが、特許文献１に開示されている技術の場合、リブ８の圧力面からの立ち上がり寸法が比較的大きくなっているところから、図１０に示すように、圧力面の外周側に向く流れｆが前記リブ８を乗り越えるときに、大きな乱れ（即ち、剥離ｅ）が発生して、ファン騒音が上昇するおそれがある。   However, in the case of the technology disclosed in Patent Document 1, since the rising dimension of the rib 8 from the pressure surface is relatively large, as shown in FIG. When getting over the rib 8, a large turbulence (that is, peeling e) may occur and the fan noise may increase.

本願発明は、上記の点に鑑みてなされたもので、羽根の圧力面側から負圧面側への漏れ流れを効果的に抑制することにより、ファンの高効率化を図ることを目的としている。   The present invention has been made in view of the above points, and aims to increase the efficiency of the fan by effectively suppressing the leakage flow from the pressure surface side of the blade to the suction surface side.

本願発明では、上記課題を解決するための第１の手段として、駆動源であるファンモータ３に連結されるハブ４と該ハブ４の外周に放射状に設けられた複数の羽根５，５・・とからなる羽根車１と、該羽根車１の外周側に配設されたベルマウス２とによって構成されたプロペラファンにおいて、前記各羽根５の圧力面５ａにおける外周側に、該各羽根５の後縁５ｅ近傍において圧力面５ａから負圧面５ｂへの漏れ流れを抑制するリブ６を羽根５の外周に沿って形成している。   In the present invention, as a first means for solving the above-mentioned problems, a hub 4 connected to a fan motor 3 as a drive source and a plurality of blades 5, 5. In the propeller fan configured by the impeller 1 and the bell mouth 2 disposed on the outer peripheral side of the impeller 1, on the outer peripheral side of the pressure surface 5 a of each blade 5, A rib 6 is formed along the outer periphery of the blade 5 to suppress leakage flow from the pressure surface 5a to the negative pressure surface 5b in the vicinity of the trailing edge 5e.

上記のように構成したことにより、ベルマウス２とオーバーラップする範囲で、羽根５の圧力面５ａ側におけるハブ４側から外周側への気流ｆが流れにくくなるところから、翼端５ｃにおける圧力面５ａ側から負圧面５ｂ側への漏れ流れが少なくなり、ファンの高効率化を図ることができる。   By configuring as described above, the air flow f from the hub 4 side to the outer peripheral side on the pressure surface 5a side of the blade 5 is less likely to flow in the range overlapping with the bell mouth 2, so that the pressure surface at the blade tip 5c Leakage flow from the 5a side to the suction surface 5b side is reduced, and the efficiency of the fan can be increased.

本願発明では、上記課題を解決するための第２の手段として、駆動源３であるファンモータ３に連結されるハブ４と該ハブ４の外周に放射状に設けられた複数の羽根５，５・・とからなる羽根車１と、該羽根車１の外周側に配設されたベルマウス２とによって構成されたプロペラファンにおいて、前記各羽根５の圧力面５ａにおける外周側に、該各羽根５の前縁５ｄと後縁５ｅとのほぼ中間位置部分において圧力面５ａから負圧面５ｂへの漏れ流れを抑制するリブ６を羽根５の外周に沿って形成している。   In the present invention, as a second means for solving the above-mentioned problem, a hub 4 connected to a fan motor 3 as a driving source 3 and a plurality of blades 5, 5. In the propeller fan configured by the impeller 1 comprising the following and the bell mouth 2 disposed on the outer peripheral side of the impeller 1, the blades 5 are arranged on the outer peripheral side of the pressure surface 5 a of the blades 5. A rib 6 is formed along the outer periphery of the blade 5 to suppress the leakage flow from the pressure surface 5a to the negative pressure surface 5b at a substantially intermediate position between the front edge 5d and the rear edge 5e.

上記のように構成したことにより、ベルマウス２とオーバーラップしない吸込側の範囲で、羽根５の圧力面５ａ側におけるハブ４側から外周側への気流ｆが流れにくくなるところから、翼端５ｃにおける圧力面５ａ側から負圧面５ｂ側へ回り込む気流が減り、翼端渦の発達が抑制されることとなる結果、翼端渦による圧力損失が減り、ファンの高効率化を図ることができる。   By configuring as described above, the air flow f from the hub 4 side to the outer peripheral side on the pressure surface 5a side of the blade 5 becomes difficult to flow in the range of the suction side that does not overlap with the bell mouth 2, so that the blade tip 5c As a result, the flow of air from the pressure surface 5a side to the negative pressure surface 5b side is reduced, and the development of the blade tip vortex is suppressed.

本願発明では、上記課題を解決するための第３の手段として、駆動源であるファンモータ３に連結されるハブ４と該ハブ４の外周に放射状に設けられた複数の羽根５，５・・とからなる羽根車１と、該羽根車１の外周側に配設されたベルマウス２とによって構成されたプロペラファンにおいて、前記各羽根５の圧力面５ａにおける外周側に、該各羽根５の前縁５ｄと後縁５ｅとのほぼ中間位置から後縁５ｅに向かって圧力面５ａから負圧面５ｂへの漏れ流れを抑制するリブ６を羽根５の外周に沿って形成している。   In the present invention, as a third means for solving the above-described problem, a hub 4 connected to a fan motor 3 as a drive source and a plurality of blades 5, 5. In the propeller fan configured by the impeller 1 and the bell mouth 2 disposed on the outer peripheral side of the impeller 1, on the outer peripheral side of the pressure surface 5 a of each blade 5, Ribs 6 are formed along the outer periphery of the blade 5 to suppress leakage flow from the pressure surface 5a to the negative pressure surface 5b from the substantially middle position between the front edge 5d and the rear edge 5e toward the rear edge 5e.

上記のように構成したことにより、各羽根５の前縁５ｄと後縁５ｅとのほぼ中間位置から後縁５ｅに向かって広範囲に存在するリブ６により、翼端渦の発達が抑制されるとともに、ベルマウス２と羽根５の外周との間の漏れ流れが低減され、ファンの高効率化を図ることができる。   With the configuration described above, the development of the blade tip vortex is suppressed by the rib 6 existing in a wide range from the substantially middle position between the leading edge 5d and the trailing edge 5e of each blade 5 toward the trailing edge 5e. The leakage flow between the bell mouth 2 and the outer periphery of the blade 5 is reduced, and the efficiency of the fan can be increased.

本願発明では、さらに、上記課題を解決するための第４の手段として、上記第１、第２又は第３の手段を備えたプロペラファンにおいて、前記リブ６を、羽根５の内周側に向かって複数列形成することもでき、そのように構成した場合、羽根５のハブ４側から外周側への気流がより一層流れにくくなり、ファンのより一層の高効率化を図ることができる。   In the present invention, as a fourth means for solving the above problems, in the propeller fan provided with the first, second or third means, the rib 6 is directed toward the inner peripheral side of the blade 5. A plurality of rows can be formed, and in such a configuration, the airflow from the hub 4 side to the outer peripheral side of the blades 5 becomes more difficult to flow, and the fan can be made more highly efficient.

本願発明の第１の手段によれば、駆動源であるファンモータ３に連結されるハブ４と該ハブ４の外周に放射状に設けられた複数の羽根５，５・・とからなる羽根車１と、該羽根車１の外周側に配設されたベルマウス２とによって構成されたプロペラファンにおいて、前記各羽根５の圧力面５ａにおける外周側に、該各羽根５の後縁５ｅ近傍において圧力面５ａから負圧面５ｂへの漏れ流れを抑制するリブ６を羽根５の外周に沿って形成して、ベルマウス２とオーバーラップする範囲で、羽根５の圧力面５ａ側におけるハブ４側から外周側への気流ｆが流れにくくなるようにしたので、翼端５ｃにおける圧力面５ａ側から負圧面５ｂ側への漏れ流れが少なくなり、ファンの高効率化を図ることができるという効果がある。   According to the first means of the present invention, an impeller 1 comprising a hub 4 connected to a fan motor 3 as a drive source and a plurality of blades 5, 5... Radially provided on the outer periphery of the hub 4. And a propeller fan constituted by a bell mouth 2 disposed on the outer peripheral side of the impeller 1, a pressure is applied on the outer peripheral side of the pressure surface 5 a of each blade 5 near the rear edge 5 e of each blade 5. A rib 6 that suppresses leakage flow from the surface 5a to the suction surface 5b is formed along the outer periphery of the blade 5 and overlaps the bell mouth 2 from the hub 4 side on the pressure surface 5a side of the blade 5 to the outer periphery. Since the air flow f to the side becomes difficult to flow, the leakage flow from the pressure surface 5a side to the negative pressure surface 5b side at the blade tip 5c is reduced, and there is an effect that the efficiency of the fan can be improved.

本願発明の第２の手段によれば、駆動源３であるファンモータ３に連結されるハブ４と該ハブ４の外周に放射状に設けられた複数の羽根５，５・・とからなる羽根車１と、該羽根車１の外周側に配設されたベルマウス２とによって構成されたプロペラファンにおいて、前記各羽根５の圧力面５ａにおける外周側に、該各羽根５の前縁５ｄと後縁５ｅとのほぼ中間位置部分において圧力面５ａから負圧面５ｂへの漏れ流れを抑制するリブ６を羽根５の外周に沿って形成して、ベルマウス２とオーバーラップしない吸込側の範囲で、羽根５の圧力面５ａ側におけるハブ４側から外周側への気流ｆが流れにくくなるようにしたので、翼端５ｃにおける圧力面５ａ側から負圧面５ｂ側へ回り込む気流が減り、翼端渦の発達が抑制されることとなる結果、翼端渦による圧力損失が減り、ファンの高効率化を図ることができるという効果がある。   According to the second means of the present invention, an impeller comprising a hub 4 connected to a fan motor 3 as a drive source 3 and a plurality of blades 5, 5... Radially provided on the outer periphery of the hub 4. 1 and a bell mouth 2 arranged on the outer peripheral side of the impeller 1, the front edge 5 d of each blade 5 and the rear edge are disposed on the outer peripheral side of the pressure surface 5 a of each blade 5. A rib 6 that suppresses leakage flow from the pressure surface 5a to the negative pressure surface 5b at an approximately middle position with the edge 5e is formed along the outer periphery of the blade 5, and in a range on the suction side that does not overlap with the bell mouth 2, Since the airflow f from the hub 4 side to the outer peripheral side on the pressure surface 5a side of the blade 5 is made difficult to flow, the airflow flowing from the pressure surface 5a side to the negative pressure surface 5b side at the blade tip 5c is reduced, and the blade tip vortex The result that development is suppressed Reduces pressure loss due to blade tip vortex, there is an effect that it is possible to increase the efficiency of the fan.

本願発明の第３の手段によれば、駆動源であるファンモータ３に連結されるハブ４と該ハブ４の外周に放射状に設けられた複数の羽根５，５・・とからなる羽根車１と、該羽根車１の外周側に配設されたベルマウス２とによって構成されたプロペラファンにおいて、前記各羽根５の圧力面５ａにおける外周側に、該各羽根５の前縁５ｄと後縁５ｅとのほぼ中間位置から後縁５ｅに向かって圧力面５ａから負圧面５ｂへの漏れ流れを抑制するリブ６を羽根５の外周に沿って形成して、各羽根５の前縁５ｄと後縁５ｅとのほぼ中間位置から後縁５ｅに向かって広範囲に存在するリブ６により、翼端渦の発達が抑制されるとともに、ベルマウス２と羽根５の外周との間の漏れ流れが低減されるようにしたので、ファンの高効率化を図ることができるという効果がある。   According to the third means of the present invention, an impeller 1 comprising a hub 4 connected to a fan motor 3 as a driving source and a plurality of blades 5, 5... Radially provided on the outer periphery of the hub 4. And a front edge 5d and a rear edge of each blade 5 on the outer peripheral side of the pressure surface 5a of each blade 5 in the propeller fan constituted by the bell mouth 2 disposed on the outer periphery side of the impeller 1 Ribs 6 are formed along the outer periphery of the blades 5 to suppress leakage flow from the pressure surface 5a to the negative pressure surface 5b from the substantially intermediate position with respect to the rear edge 5e. The rib 6 existing in a wide range from the substantially intermediate position to the edge 5e toward the rear edge 5e suppresses the development of the blade tip vortex and reduces the leakage flow between the bell mouth 2 and the outer periphery of the blade 5. As a result, high fan efficiency can be achieved. There is an effect that.

本願発明の第４の手段におけるように、上記第１、第２又は第３の手段を備えたプロペラファンにおいて、前記リブ６を、羽根５の内周側に向かって複数列形成することもでき、そのように構成した場合、羽根５のハブ４側から外周側への気流がより一層流れにくくなり、ファンのより一層の高効率化を図ることができる。   As in the fourth means of the present invention, in the propeller fan provided with the first, second or third means, the ribs 6 can be formed in a plurality of rows toward the inner peripheral side of the blade 5. In such a configuration, the airflow from the hub 4 side to the outer peripheral side of the blades 5 becomes more difficult to flow, and the fan can be made more efficient.

以下、添付の図面を参照して、本願発明を幾つかの好適な実施の形態について説明する。   The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

第１の実施の形態
図１および図２には、本願発明の第１の実施の形態にかかるプロペラファンが示されている。 First Embodiment FIGS. 1 and 2 show a propeller fan according to a first embodiment of the present invention.

このプロペラファンは、従来技術の項で既に説明したものと同様に、駆動源であるファンモータ３に連結されるハブ４と該ハブ４の外周に放射状に設けられた複数の羽根５，５・・とからなる羽根車１と、該羽根車１の外周側に配設されたベルマウス２とによって構成されている（図６および図７参照）。   This propeller fan has a hub 4 connected to a fan motor 3 as a driving source and a plurality of blades 5, 5. An impeller 1 comprising: and a bell mouth 2 disposed on the outer peripheral side of the impeller 1 (see FIGS. 6 and 7).

そして、前記各羽根５の圧力面５ａにおける外周側には、該各羽根５の後縁５ｅ近傍において圧力面５ａから負圧面５ｂへの漏れ流れを抑制する複数のリブ６，６・・が羽根５の外周に沿って該羽根５の内周側に向かって複数列形成されている。   A plurality of ribs 6, 6,... For suppressing leakage flow from the pressure surface 5a to the negative pressure surface 5b in the vicinity of the trailing edge 5e of each blade 5 are provided on the outer peripheral side of the pressure surface 5a of each blade 5. A plurality of rows are formed along the outer periphery of the blade 5 toward the inner periphery of the blade 5.

前記各リブ６は、羽根６の肉厚と同等の厚さおよび幅を有する略断面正方形形状とされており、リブ６，６・・の最内周側に位置するものは、羽根５の圧力面５ａ上における流線のうち吸込側から吐出側へ流れる流線より外周側に形成されるのが、羽根圧力面５ａにおいて翼端５ｃ側に向かう流れをリブ６，６・・の存在により流れにくくする点で望ましい。   Each of the ribs 6 has a substantially square cross-sectional shape having a thickness and width equivalent to the thickness of the blade 6, and the rib 6, 6. Of the flow lines on the surface 5a, the flow line formed on the outer peripheral side from the flow line flowing from the suction side to the discharge side flows on the blade pressure surface 5a toward the blade tip 5c due to the presence of the ribs 6, 6,. Desirable in terms of difficulty.

上記のように構成したことにより、ベルマウス２とオーバーラップする範囲で（図２参照）、羽根５の圧力面５ａ側におけるハブ４側から外周側への気流ｆをが流れにくくなる。その結果、翼端５ｃにおける圧力面５ａ側から負圧面５ｂ側への漏れ流れが少なくなり、ファンの高効率化を図ることができる。   By configuring as described above, the air flow f from the hub 4 side to the outer peripheral side on the pressure surface 5a side of the blade 5 is less likely to flow in the range overlapping the bell mouth 2 (see FIG. 2). As a result, the leakage flow from the pressure surface 5a side to the negative pressure surface 5b side at the blade tip 5c is reduced, and the efficiency of the fan can be increased.

第２の実施の形態
図３および図４には、本願発明の第２の実施の形態にかかるプロペラファンが示されている。 Second Embodiment FIGS. 3 and 4 show a propeller fan according to a second embodiment of the present invention.

この場合、各羽根５の圧力面５ａにおける外周側には、該各羽根５の前縁５ｄと後縁５ｅとのほぼ中間位置部分において圧力面５ａから負圧面５ｂへの漏れ流れを抑制する複数のリブ６，６・・が羽根５の外周に沿って該羽根５の内周側に向かって複数列形成されている。なお、本実施の形態の場合にも、前記各リブ６は、羽根６の肉厚と同等の厚さおよび幅を有する略断面正方形形状とされており、リブ６，６・・の最内周側に位置するものは、羽根５の圧力面５ａ上における流線のうち吸込側から吐出側へ流れる流線より外周側に形成されるのが、羽根圧力面５ａにおいて翼端５ｃ側に向かう流れをリブ６，６・・の存在により流れにくくする点で望ましい。   In this case, on the outer peripheral side of the pressure surface 5a of each blade 5, there are a plurality of components that suppress the leakage flow from the pressure surface 5a to the negative pressure surface 5b at a substantially intermediate position portion between the front edge 5d and the rear edge 5e of each blade 5. Are formed in a plurality of rows along the outer periphery of the blade 5 toward the inner peripheral side of the blade 5. Also in this embodiment, each of the ribs 6 has a substantially square cross-sectional shape having a thickness and width equivalent to the thickness of the blade 6, and the innermost circumference of the ribs 6, 6,. What is located on the side is formed on the outer peripheral side of the flow line on the pressure surface 5a of the blade 5 from the flow line flowing from the suction side to the discharge side, and the flow toward the blade tip 5c side on the blade pressure surface 5a. Is desirable in that it is difficult to flow due to the presence of the ribs 6,.

上記のように構成したことにより、ベルマウス２とオーバーラップしない吸込側の範囲で（図４参照）、羽根５の圧力面５ａ側におけるハブ４側から外周側への気流ｆが流れにくくなる。その結果、翼端５ｃにおける圧力面５ａ側から負圧面５ｂ側へ回り込む気流が減り、翼端渦の発達が抑制されることとなり、翼端渦による圧力損失が減り、ファンの高効率化を図ることができる。   With the above-described configuration, the air flow f from the hub 4 side to the outer peripheral side on the pressure surface 5a side of the blade 5 is less likely to flow in the range on the suction side that does not overlap the bell mouth 2 (see FIG. 4). As a result, the airflow flowing from the pressure surface 5a side to the negative pressure surface 5b side at the blade tip 5c is reduced, the development of the blade tip vortex is suppressed, the pressure loss due to the blade tip vortex is reduced, and the efficiency of the fan is increased. be able to.

第３の実施の形態
図５には、本願発明の第３の実施の形態にかかるプロペラファンが示されている。 Third Embodiment FIG. 5 shows a propeller fan according to a third embodiment of the present invention.

この場合、各羽根５の圧力面５ａにおける外周側には、該各羽根５の前縁５ｄと後縁５ｅとのほぼ中間位置から後縁５ｅに向かって圧力面５ａから負圧面５ｂへの漏れ流れを抑制する複数のリブ６が羽根５の外周に沿って該羽根５の内周側に向かって複数列形成されている。なお、本実施の形態の場合にも、前記各リブ６は、羽根６の肉厚と同等の厚さおよび幅を有する略断面正方形形状とされており、リブ６，６・・の最内周側に位置するものは、羽根５の圧力面５ａ上における流線のうち吸込側から吐出側へ流れる流線より外周側に形成されるのが、羽根圧力面５ａにおいて翼端５ｃ側に向かう流れをリブ６，６・・の存在により流れにくくする点で望ましい。   In this case, on the outer peripheral side of the pressure surface 5a of each blade 5, leakage from the pressure surface 5a to the negative pressure surface 5b from the substantially intermediate position between the front edge 5d and the rear edge 5e of each blade 5 toward the rear edge 5e. A plurality of ribs 6 for suppressing the flow are formed in a plurality of rows along the outer periphery of the blade 5 toward the inner peripheral side of the blade 5. Also in this embodiment, each of the ribs 6 has a substantially square cross-sectional shape having a thickness and width equivalent to the thickness of the blade 6, and the innermost circumference of the ribs 6, 6,. What is located on the side is formed on the outer peripheral side of the flow line on the pressure surface 5a of the blade 5 from the flow line flowing from the suction side to the discharge side, and the flow toward the blade tip 5c side on the blade pressure surface 5a. Is desirable in that it is difficult to flow due to the presence of the ribs 6,.

上記のように構成したことにより、各羽根５の前縁５ｄと後縁５ｅとのほぼ中間位置から後縁５ｅに向かって広範囲に存在するリブ６，６・・により、翼端渦の発達が抑制されるとともに、ベルマウス２と羽根５の外周との間の漏れ流れが低減されることとなり、ファンの高効率化を図ることができる。   By configuring as described above, the development of the blade tip vortex is caused by the ribs 6, 6,... Existing in a wide range from the substantially middle position between the leading edge 5d and the trailing edge 5e of each blade 5 toward the trailing edge 5e. In addition to being suppressed, the leakage flow between the bell mouth 2 and the outer periphery of the blade 5 is reduced, and the efficiency of the fan can be increased.

本願発明は、上記各実施の形態に限定されるものではなく、発明の要旨を逸脱しない範囲において、適宜設計変更可能なことは勿論である。   The present invention is not limited to the above-described embodiments, and it is of course possible to change the design as appropriate without departing from the scope of the invention.

本願発明の第１の実施の形態にかかるプロペラファンにおける羽根車の要部を示す部分正面図である。It is a partial front view which shows the principal part of the impeller in the propeller fan concerning 1st Embodiment of this invention. 図１のＩＩ−ＩＩ断面図である。It is II-II sectional drawing of FIG. 本願発明の第２の実施の形態にかかるプロペラファンにおける羽根車の要部を示す部分正面図である。It is a partial front view which shows the principal part of the impeller in the propeller fan concerning the 2nd Embodiment of this invention. 図３のＩＶ−ＩＶ断面図である。It is IV-IV sectional drawing of FIG. 本願発明の第３の実施の形態にかかるプロペラファンにおける羽根車の要部を示す部分正面図である。It is a partial front view which shows the principal part of the impeller in the propeller fan concerning the 3rd Embodiment of this invention. 一般のプロペラファンを示す断面図である。It is sectional drawing which shows a general propeller fan. 一般のプロペラファンにおける羽根車の正面図である。It is a front view of the impeller in a general propeller fan. 一般のプロペラファンにおける翼端渦と漏れ流れとの関係を示す要部拡大斜視図である。It is a principal part expansion perspective view which shows the relationship between the blade tip vortex and the leakage flow in a general propeller fan. 従来公知のプロペラファンを側面から見た側面図である。It is the side view which looked at the conventionally well-known propeller fan from the side. 従来公知のプロペラファンの断面図である。It is sectional drawing of a conventionally well-known propeller fan.

符号の説明Explanation of symbols

１は羽根車
２はベルマウス
３はファンモータ
４はハブ
５は羽根
５ａは圧力面
５ｂは負圧面
５ｃは翼端
５ｄは前縁
５ｅは後縁
６はリブ
ｆは気流 1 is an impeller 2 is a bell mouth 3 is a fan motor 4 is a hub 5 is a blade 5a is a pressure surface 5b is a negative pressure surface 5c is a blade tip 5d is a leading edge 5e is a trailing edge 6 is a rib f is an air current

Claims (4)

駆動源であるファンモータ（３）に連結されるハブ（４）と該ハブ（４）の外周に放射状に設けられた複数の羽根（５），（５）・・とからなる羽根車（１）と、該羽根車（１）の外周側に配設されたベルマウス（２）とによって構成されたプロペラファンであって、前記各羽根（５）の圧力面（５ａ）における外周側には、該各羽根（５）の後縁（５ｅ）近傍において圧力面（５ａ）から負圧面（５ｂ）への漏れ流れを抑制するリブ（６）を羽根（５）の外周に沿って形成したことを特徴とするプロペラファン。   An impeller (1) comprising a hub (4) connected to a fan motor (3) as a driving source and a plurality of blades (5), (5),... Radially provided on the outer periphery of the hub (4) ) And a bell mouth (2) disposed on the outer peripheral side of the impeller (1), the outer peripheral side of the pressure surface (5a) of each blade (5) The rib (6) that suppresses the leakage flow from the pressure surface (5a) to the suction surface (5b) is formed along the outer periphery of the blade (5) in the vicinity of the rear edge (5e) of each blade (5). Propeller fan characterized by. 駆動源であるファンモータ（３）に連結されるハブ（４）と該ハブ（４）の外周に放射状に設けられた複数の羽根（５），（５）・・とからなる羽根車（１）と、該羽根車（１）の外周側に配設されたベルマウス（２）とによって構成されたプロペラファンであって、前記各羽根（５）の圧力面（５ａ）における外周側には、該各羽根（５）の前縁（５ｄ）と後縁（５ｅ）とのほぼ中間位置部分において圧力面（５ａ）から負圧面（５ｂ）への漏れ流れを抑制するリブ（６）を羽根（５）の外周に沿って形成したことを特徴とするプロペラファン。   An impeller (1) comprising a hub (4) connected to a fan motor (3) as a driving source and a plurality of blades (5), (5),... Radially provided on the outer periphery of the hub (4) ) And a bell mouth (2) disposed on the outer peripheral side of the impeller (1), the outer peripheral side of the pressure surface (5a) of each blade (5) The rib (6) that suppresses the leakage flow from the pressure surface (5a) to the suction surface (5b) at a substantially intermediate position between the front edge (5d) and the rear edge (5e) of each blade (5). A propeller fan characterized by being formed along the outer periphery of (5). 駆動源であるファンモータ（３）に連結されるハブ（４）と該ハブ（４）の外周に放射状に設けられた複数の羽根（５），（５）・・とからなる羽根車（１）と、該羽根車（１）の外周側に配設されたベルマウス（２）とによって構成されたプロペラファンであって、前記各羽根（５）の圧力面（５ａ）における外周側には、該各羽根（５）の前縁（５ｄ）と後縁（５ｅ）とのほぼ中間位置から後縁（５ｅ）に向かって圧力面（５ａ）から負圧面（５ｂ）への漏れ流れを抑制するリブ（６）を羽根（５）の外周に沿って形成したことを特徴とするプロペラファン。   An impeller (1) comprising a hub (4) connected to a fan motor (3) as a driving source and a plurality of blades (5), (5),... Radially provided on the outer periphery of the hub (4) ) And a bell mouth (2) disposed on the outer peripheral side of the impeller (1), the outer peripheral side of the pressure surface (5a) of each blade (5) The leakage flow from the pressure surface (5a) to the negative pressure surface (5b) from the substantially middle position between the front edge (5d) and the rear edge (5e) of each blade (5) toward the rear edge (5e) is suppressed. A propeller fan characterized in that a rib (6) to be formed is formed along the outer periphery of the blade (5). 前記リブ（６）を、羽根（５）の内周側に向かって複数列形成したことを特徴とする請求項１、２および３のいずれか一項記載のプロペラファン。   The propeller fan according to any one of claims 1, 2, and 3, wherein the ribs (6) are formed in a plurality of rows toward the inner peripheral side of the blade (5).
JP2007183039A 2007-07-12 2007-07-12 Propeller fan Pending JP2009019576A (en)

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CN106438471A (en) * 2016-11-15 2017-02-22 广东美的制冷设备有限公司 Axial-flow wind wheel and air conditioner
CN106766045A (en) * 2016-11-15 2017-05-31 广东美的制冷设备有限公司 Air-supply assembly and air-conditioner

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Publication number Priority date Publication date Assignee Title
CN106438471A (en) * 2016-11-15 2017-02-22 广东美的制冷设备有限公司 Axial-flow wind wheel and air conditioner
CN106766045A (en) * 2016-11-15 2017-05-31 广东美的制冷设备有限公司 Air-supply assembly and air-conditioner

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