JP2018035798A - Axial fan and outdoor unit - Google Patents

Axial fan and outdoor unit Download PDF

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JP2018035798A
JP2018035798A JP2016172139A JP2016172139A JP2018035798A JP 2018035798 A JP2018035798 A JP 2018035798A JP 2016172139 A JP2016172139 A JP 2016172139A JP 2016172139 A JP2016172139 A JP 2016172139A JP 2018035798 A JP2018035798 A JP 2018035798A
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rear edge
edge portion
groove
blade
axial fan
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JP6776739B2 (en
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澤田 大貴
Hirotaka Sawada
大貴 澤田
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Fujitsu General Ltd
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Fujitsu General Ltd
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Priority to JP2016172139A priority Critical patent/JP6776739B2/en
Priority to AU2017206193A priority patent/AU2017206193B2/en
Priority to US15/660,067 priority patent/US10400604B2/en
Priority to CN201710618600.8A priority patent/CN107795516B/en
Priority to EP17184976.3A priority patent/EP3290715B1/en
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Abstract

PROBLEM TO BE SOLVED: To improve an action for suppressing generation of noise due to air flow, and to properly secure mechanical strength of rear edge portions of blades.SOLUTION: An axial fan includes a hut and a plurality of blades 12 provided in a circumferential direction of the hub. The blades are respectively provided with a cutout portion dividing a rear edge portion into an outer peripheral-side rear edge portion 17A and an inner peripheral-side rear edge portion on a rear edge portion at a side opposite to a front edge portion in a rotating direction of the blade in a manner of being extended from the rear edge portion toward the front edge portion. The outer peripheral-side rear edge portion is provided with a first groove portion 21 composed of a plurality of grooves penetrating in a thickness direction of the blades and extended toward the front edge portion along the outer peripheral-side rear edge portion. The blades are provided with reinforcement portions 23 for reinforcing the rear edge portions, the reinforcement portions are projected from an end face at a front edge portion side toward a rear edge portion side in the grooves of the first groove portion, and respectively connected to inner faces opposed to the grooves of the first groove portion. On a cross-section along the thickness direction of the blade, an angular portion projecting to the rear edge portion side, of each reinforcement portion is positioned between a negative pressure face 12a and a positive pressure face 12b in the thickness direction of the blade.SELECTED DRAWING: Figure 7

Description

本発明は、軸流ファン及び室外機に関する。   The present invention relates to an axial fan and an outdoor unit.

軸流ファンには、翼の回転方向における後縁部に前縁部側へ向かって延びる切り欠き部が設けられており、切り欠き部によって後縁部が外周側後縁部と内周側後縁部とに分けられたものがある(例えば、特許文献1)。この軸流ファンでは、翼の前縁部で生じた渦が、翼面に沿って前縁部から後縁部へ流れて切り欠き部に捉えられて保持されることで、渦の変動や発達を抑え、空気の流れによる騒音を抑えている。   The axial fan is provided with a notch extending toward the front edge at the rear edge in the blade rotation direction, and the rear edge is separated from the outer peripheral rear edge and the inner peripheral rear by the notch. There is one divided into an edge (for example, Patent Document 1). In this axial fan, the vortex generated at the leading edge of the blade flows from the leading edge to the trailing edge along the blade surface and is captured and held in the notch, so that the vortex changes and develops. Suppresses noise caused by air flow.

また、関連技術の軸流ファンとして、翼の後縁部に、後縁部から前縁部側へ向かって延びる複数の溝が形成された構成が知られている(例えば、特許文献2)。この軸流ファンでは、翼の後縁部に生じる渦の大きさを細分化することにより、空気の流れによる騒音の低減を図っている。   Further, as an axial fan of related art, a configuration in which a plurality of grooves extending from the rear edge portion toward the front edge portion side is formed in the rear edge portion of the blade is known (for example, Patent Document 2). In this axial fan, noise caused by air flow is reduced by subdividing the size of vortices generated at the trailing edge of the blade.

特許第5252070号公報Japanese Patent No. 5252070 特開平8−189497号公報JP-A-8-189497

ところで、翼の後縁部に切り欠き部が設けられた軸流ファンでは、外周側後縁部における風速が、内周側後縁部における風速よりも速くなる傾向がある。このため、外周側後縁部に溝が設けられる構成では、外周側後縁部における風速に応じて、後縁部から前縁部側へ向かって延びる溝の深さを大きくすることによって、騒音を低減する作用が高められる。しかしながら、溝の深さを大きくすることにより、外周側後縁部の機械的強度の低下を招くので、風速に応じて、溝の深さを十分に確保することが困難となる場合がある。   By the way, in the axial fan in which the notch part was provided in the trailing edge part of the wing | blade, the wind speed in an outer peripheral side rear edge part tends to become faster than the wind speed in an inner peripheral side rear edge part. For this reason, in the configuration in which a groove is provided at the outer peripheral side rear edge, noise is increased by increasing the depth of the groove extending from the rear edge toward the front edge according to the wind speed at the outer peripheral side rear edge. The effect | action which reduces is raised. However, increasing the depth of the groove causes a decrease in the mechanical strength of the outer peripheral side rear edge, so it may be difficult to ensure a sufficient depth of the groove according to the wind speed.

開示の技術は、上記に鑑みてなされたものであって、空気の流れによる騒音の発生を抑える作用を高めると共に後縁部の機械的強度を適正に確保することができる軸流ファン及び室外機を提供することを目的とする。   The disclosed technology has been made in view of the above, and an axial fan and an outdoor unit that can enhance the action of suppressing the generation of noise due to the air flow and can appropriately ensure the mechanical strength of the trailing edge. The purpose is to provide.

本願の開示する軸流ファンの一態様は、ハブと、前記ハブの周方向に設けられた複数の翼と、を備える。前記翼には、前記翼の回転方向における前縁部の反対側の後縁部に、当該後縁部を外周側後縁部と内周側後縁部とに分ける切り欠き部が、前記後縁部から前記前縁部へ向かって延びて形成される。前記外周側後縁部には、前記翼の厚み方向に貫通して前記前縁部へ向かって延びる複数の溝で形成される第1溝部が、前記外周側後縁部に沿って設けられる。前記翼には、前記後縁部を補強する補強部が設けられ、当該補強部は、前記第1溝部の溝内の、前記前縁部側の端面から、前記後縁部側へ突出すると共に前記第1溝部の溝の対向する各内面に連結され、前記翼の厚み方向に沿う断面において、前記補強部の、前記後縁部側へ突出する角部は、前記翼の厚み方向における負圧面と正圧面との間に位置する。   One aspect of the axial fan disclosed in the present application includes a hub and a plurality of blades provided in the circumferential direction of the hub. The wing has a notch that divides the rear edge into an outer peripheral rear edge and an inner peripheral rear edge at the rear edge opposite to the front edge in the rotational direction of the wing. It is formed extending from the edge toward the front edge. A first groove formed by a plurality of grooves that penetrates in the thickness direction of the blade and extends toward the front edge is provided along the outer periphery on the rear edge. The wing is provided with a reinforcing portion that reinforces the rear edge portion, and the reinforcing portion protrudes from the end surface on the front edge portion side in the groove of the first groove portion toward the rear edge portion side. In the cross section along the thickness direction of the blade, the corner portion of the reinforcing portion that protrudes toward the trailing edge in the cross section along the thickness direction of the blade is a suction surface in the blade thickness direction. And the pressure surface.

本願の開示する軸流ファンの一態様によれば、空気の流れによる騒音の発生を抑える作用を高めると共に後縁部の機械的強度を適正に確保することができる。   According to one aspect of the axial fan disclosed in the present application, it is possible to enhance the action of suppressing the generation of noise due to the air flow and to appropriately ensure the mechanical strength of the trailing edge.

図1は、軸流ファンを有する実施例の室外機を示す模式図である。FIG. 1 is a schematic diagram illustrating an outdoor unit of an embodiment having an axial fan. 図2は、実施例の軸流ファンを示す平面図である。FIG. 2 is a plan view showing the axial fan of the embodiment. 図3は、実施例の軸流ファンを示す斜視図である。FIG. 3 is a perspective view illustrating the axial fan according to the embodiment. 図4は、実施例の軸流ファンの翼を示す平面図である。FIG. 4 is a plan view showing blades of the axial fan according to the embodiment. 図5は、実施例の軸流ファンの翼が有する第1溝部及び第2溝部を拡大して示す平面図である。FIG. 5 is an enlarged plan view showing the first groove portion and the second groove portion of the blades of the axial fan according to the embodiment. 図6は、実施例の軸流ファンの翼が有する第1溝部を拡大して示す斜視図である。FIG. 6 is an enlarged perspective view showing the first groove portion of the blade of the axial fan according to the embodiment. 図7は、実施例の軸流ファンの翼が有する第1溝部の補強部を拡大して示す斜視図である。FIG. 7 is an enlarged perspective view showing the reinforcing portion of the first groove portion of the blade of the axial fan according to the embodiment. 図8は、実施例の軸流ファンの翼が有する第1溝部の補強部を示す断面図である。FIG. 8 is a cross-sectional view illustrating a reinforcing portion of the first groove portion of the blade of the axial fan according to the embodiment. 図9は、比較例の軸流ファンの翼が有する第1溝部を示す断面図である。FIG. 9 is a cross-sectional view showing the first groove portion of the blade of the axial fan of the comparative example.

以下に、本願の開示する軸流ファン及び室外機の実施例を図面に基づいて詳細に説明する。なお、以下の実施例によって、本願の開示する軸流ファン及び室外機が限定されるものではない。   Hereinafter, embodiments of an axial fan and an outdoor unit disclosed in the present application will be described in detail with reference to the drawings. In addition, the axial flow fan and outdoor unit which this application discloses are not limited by the following examples.

(室外機の構成)
図1は、軸流ファンを有する実施例の室外機を示す模式図である。図1に示すように、実施例の室外機1は、空気調和機で用いられる室外ユニットである。室外機1は、冷媒を圧縮する圧縮機3と、圧縮機3に連結されて冷媒が流れる熱交換器4と、熱交換器4に送風する軸流ファン5と、これらの圧縮機3、熱交換器4及び軸流ファン5が内部に収容された筐体6と、を備える。
(Configuration of outdoor unit)
FIG. 1 is a schematic diagram illustrating an outdoor unit of an embodiment having an axial fan. As shown in FIG. 1, the outdoor unit 1 of an Example is an outdoor unit used with an air conditioner. The outdoor unit 1 includes a compressor 3 that compresses the refrigerant, a heat exchanger 4 that is connected to the compressor 3 and through which the refrigerant flows, an axial fan 5 that blows air to the heat exchanger 4, the compressor 3, And a housing 6 in which the exchanger 4 and the axial fan 5 are housed.

筐体6は、外気を取り込むための吸込み口7と、筐体6内の空気を排出するための吹出し口8と、を有する。吸込み口7は、筐体6の側面6a及び背面6cに設けられている。吹出し口8は、筐体6の前面6bに設けられている。熱交換器4は、筐体6の前面6bに対向する背面6cと側面6aとに亘って配置されている。軸流ファン5は、吹出し口8に対向して配置されており、ファンモータ(図示せず)によって回転駆動される。   The housing 6 has a suction port 7 for taking in outside air and a blowout port 8 for discharging the air in the housing 6. The suction port 7 is provided on the side surface 6 a and the back surface 6 c of the housing 6. The outlet 8 is provided on the front surface 6 b of the housing 6. The heat exchanger 4 is disposed across a back surface 6 c and a side surface 6 a that face the front surface 6 b of the housing 6. The axial fan 5 is disposed to face the outlet 8 and is driven to rotate by a fan motor (not shown).

(軸流ファンの構成)
図2は、実施例の軸流ファン5を示す平面図である。図3は、実施例の軸流ファン5を示す斜視図である。図2及び図3に示すように、軸流ファン5は、略円筒状のハブ11と、ハブ11の周方向に設けられた複数の翼12と、を有する。ハブ11は、内筒部11aと、内筒部11aの外周側に配置された外筒部11bと、を有する二重円筒状に形成されている。内筒部11aには、ファンモータの回転軸(図示せず)が嵌め込まれる軸穴11cが設けられている。内筒部11aの外周側は、放射状に配置された複数のリブ11dを介して、外筒部11bの内周側と一体に形成されている。外筒部11bの外周面には、外筒部11bの周方向に沿って所定の間隔をあけて3つの翼12が一体に形成されている。
(Configuration of axial fan)
FIG. 2 is a plan view showing the axial fan 5 of the embodiment. FIG. 3 is a perspective view showing the axial fan 5 of the embodiment. As shown in FIGS. 2 and 3, the axial fan 5 includes a substantially cylindrical hub 11 and a plurality of blades 12 provided in the circumferential direction of the hub 11. The hub 11 is formed in a double cylindrical shape having an inner cylinder part 11a and an outer cylinder part 11b arranged on the outer peripheral side of the inner cylinder part 11a. The inner cylinder portion 11a is provided with a shaft hole 11c into which a rotation shaft (not shown) of the fan motor is fitted. The outer peripheral side of the inner cylinder part 11a is formed integrally with the inner peripheral side of the outer cylinder part 11b via a plurality of radially arranged ribs 11d. Three wings 12 are integrally formed on the outer peripheral surface of the outer cylinder part 11b at a predetermined interval along the circumferential direction of the outer cylinder part 11b.

(軸流ファンの翼の形状)
図4は、実施例の軸流ファン5の翼12を示す平面図である。図5は、実施例の軸流ファン5の翼12が有する第1溝部及び第2溝部を拡大して示す平面図である。
(Shape of axial fan)
FIG. 4 is a plan view showing the blades 12 of the axial fan 5 of the embodiment. FIG. 5 is an enlarged plan view showing the first and second groove portions of the blade 12 of the axial fan 5 of the embodiment.

翼12は、図3に示すように、板状に形成されており、図2及び図4に示すように、ハブ11の外筒部11bに連結された内周縁部13の大きさに比べて、ハブ11の径方向へ延ばされた外周縁部14が広く形成されている。翼12には、翼12の回転方向における前方である前縁部16が、前縁部16の反対側に位置する後縁部17側へ向かって湾曲して形成されている。前縁部16は、回転軸方向Xから見て、例えば、湾曲している。そして、翼12の表面(翼面)は、ハブ11の周方向において、前縁部16から後縁部17に向かって、軸流ファン5の負圧側から正圧側に緩やかに湾曲して形成されている。このように翼12が形成された軸流ファン5がR方向(図3)に回転することで、空気は負圧側から正圧側へ流れる。以下、翼12において、負圧側に向く翼面を負圧面12a、正圧側に向く翼面を正圧面12bと称する。   The blade 12 is formed in a plate shape as shown in FIG. 3, and as shown in FIGS. 2 and 4, compared to the size of the inner peripheral edge portion 13 connected to the outer cylinder portion 11 b of the hub 11. The outer peripheral edge portion 14 extending in the radial direction of the hub 11 is widely formed. In the wing 12, a front edge portion 16 that is the front in the rotation direction of the wing 12 is curved toward the rear edge portion 17 located on the opposite side of the front edge portion 16. The front edge portion 16 is, for example, curved when viewed from the rotation axis direction X. The surface (blade surface) of the blade 12 is formed so as to be gently curved from the negative pressure side to the positive pressure side of the axial flow fan 5 from the front edge portion 16 toward the rear edge portion 17 in the circumferential direction of the hub 11. ing. The axial flow fan 5 in which the blades 12 are thus formed rotates in the R direction (FIG. 3), so that air flows from the negative pressure side to the positive pressure side. Hereinafter, in the blade 12, the blade surface facing the suction side is referred to as a suction surface 12a, and the blade surface facing the pressure side is referred to as a pressure surface 12b.

図2、図3及び図4に示すように、翼12の後縁部17には、後縁部17を外周側後縁部17Aと内周側後縁部17Bとに分ける切り欠き部18が設けられている。切り欠き部18は、翼12の後縁部17から前縁部16側へ向かって延びて形成されており、回転軸方向Xから見て、前縁部16に向かって先細りとなる略V字状に形成されている。また、内周側後縁部17Bは、図4及び図5に斜線領域で示すように、切り欠き部18側へ突出する略三角形状の突出部19を有しており、突出部19が、翼12の正圧面12bに沿って延びる連続した表面を有する。   As shown in FIGS. 2, 3, and 4, the rear edge 17 of the wing 12 has a notch 18 that divides the rear edge 17 into an outer peripheral rear edge 17 </ b> A and an inner peripheral rear edge 17 </ b> B. Is provided. The notch 18 is formed to extend from the rear edge 17 of the blade 12 toward the front edge 16, and is substantially V-shaped so as to taper toward the front edge 16 when viewed from the rotation axis direction X. It is formed in a shape. Further, the inner peripheral side rear edge portion 17B has a substantially triangular projecting portion 19 projecting toward the cutout portion 18 as shown by a hatched area in FIGS. 4 and 5, and the projecting portion 19 is The blade 12 has a continuous surface extending along the pressure surface 12b.

図5に示すように、翼12の正圧面12bでは、空気が前縁部16から後縁部17へ向かってハブ11の周方向Cに流れるが、軸流ファン5の回転数が大きくなるに従って、ハブ11の径方向、すなわち直線Lに沿う方向である遠心方向へ向かう空気の流れが大きくなる。直線Lは、ハブ11の回転中心Oを通ってハブ11の径方向に延びる直線である。   As shown in FIG. 5, on the positive pressure surface 12 b of the blade 12, air flows in the circumferential direction C of the hub 11 from the front edge portion 16 toward the rear edge portion 17, but as the rotational speed of the axial fan 5 increases. The flow of air toward the radial direction of the hub 11, that is, the centrifugal direction, which is the direction along the straight line L, is increased. The straight line L is a straight line extending in the radial direction of the hub 11 through the rotation center O of the hub 11.

翼12の正圧面12bを遠心方向へ流れる空気の一部は、後縁部17の切り欠き部18を通って負圧面12a側へ流れる。本実施例では、内周側後縁部17Bが有する突出部19の表面が、正圧面12bに沿って連続して延びているので、切り欠き部18を通って負圧面12a側へ流れる空気の流量が抑制されている。このように、切り欠き部18から負圧面12a側へ流れ込む空気の遠心成分を抑制し、空気の遠心成分を有効利用することで、軸流ファン5が発生する風量が高められている。   A part of the air flowing in the centrifugal direction on the pressure surface 12b of the blade 12 flows through the notch portion 18 of the rear edge portion 17 to the suction surface 12a side. In the present embodiment, since the surface of the protruding portion 19 of the inner peripheral side rear edge portion 17B extends continuously along the positive pressure surface 12b, the air flowing through the notch portion 18 toward the negative pressure surface 12a side. The flow rate is suppressed. In this way, the amount of air generated by the axial fan 5 is increased by suppressing the centrifugal component of the air flowing from the notch 18 to the negative pressure surface 12a side and effectively using the centrifugal component of the air.

また、軸流ファン5では、内周側後縁部17Bにおける風速が、外周側後縁部17Aにおける風速よりも遅くなる傾向があり、風速が遅くなるにつれて、空気の流れ方向は、翼12の回転に伴う遠心力の影響を受けやすくなる。このため、遠心力の影響により、外周側後縁部17Aにおける空気の流れ方向F1と、内周側後縁部17Bにおける空気の流れ方向F2とが異なっている。具体的には、外周側後縁部17Aにおける空気の流れ方向F1に比べて、内周側後縁部17Bにおける空気の流れ方向F2がハブ11の外周に向かって傾斜している。   Further, in the axial fan 5, the wind speed at the inner peripheral trailing edge 17B tends to be slower than the wind speed at the outer peripheral trailing edge 17A. As the wind speed decreases, the air flow direction of the blade 12 It becomes easy to be affected by centrifugal force due to rotation. For this reason, the air flow direction F1 at the outer peripheral side rear edge portion 17A and the air flow direction F2 at the inner peripheral side rear edge portion 17B are different due to the influence of centrifugal force. Specifically, the air flow direction F2 at the inner peripheral side rear edge portion 17B is inclined toward the outer periphery of the hub 11 as compared with the air flow direction F1 at the outer peripheral side rear edge portion 17A.

図4及び図5に示すように、外周側後縁部17Aの、切り欠き部18に隣接する位置には、翼12の厚み方向に貫通して前縁部16側へ向かって延びる複数の溝で形成される第1溝部21が、外周側後縁部17Aに沿って設けられている。内周側後縁部17Bの、切り欠き部18に隣接する位置には、翼12の厚み方向に貫通して前縁部16側へ向かって延びる複数の溝で形成される第2溝部22が、内周側後縁部17Bに沿って設けられている。第2溝部22は、内周側後縁部17Bが有する突出部19に設けられている。第2溝部22は、切り欠き部18が略V字状に広がる側に位置する、突出部19の外縁に沿って配置されている。そして、ハブ11の回転軸方向Xから見て、第1溝部21の溝と第2溝部22の溝とは形状が互いに異なる。なお、第1溝部21と第2溝部22は、回転軸方向Xから見た形状に限定されるものではなく、例えば、外周側後縁部17A及び内周側後縁部17Bの正圧面12bにおける形状も互いに異なっている。   As shown in FIGS. 4 and 5, a plurality of grooves extending through the blade 12 in the thickness direction and extending toward the front edge 16 at the position adjacent to the notch 18 on the outer peripheral rear edge 17 </ b> A. Is formed along the outer peripheral side rear edge 17A. A second groove portion 22 formed of a plurality of grooves penetrating in the thickness direction of the blade 12 and extending toward the front edge portion 16 side is located at a position adjacent to the notch portion 18 on the inner peripheral side rear edge portion 17B. , And provided along the inner peripheral side rear edge portion 17B. The 2nd groove part 22 is provided in the protrusion part 19 which the inner peripheral side rear edge part 17B has. The 2nd groove part 22 is arrange | positioned along the outer edge of the protrusion part 19 located in the side which the notch part 18 spreads in a substantially V shape. When viewed from the rotation axis direction X of the hub 11, the groove of the first groove portion 21 and the groove of the second groove portion 22 are different from each other. In addition, the 1st groove part 21 and the 2nd groove part 22 are not limited to the shape seen from the rotating shaft direction X, For example, in the positive pressure surface 12b of the outer peripheral side rear edge part 17A and the inner peripheral side rear edge part 17B. The shapes are also different from each other.

より具体的には、図5に示すように、第1溝部21の溝は、後縁部17から前縁部16へ向かって延びる深さD1が、第2溝部22の溝の深さD2よりも大きい溝を含んでいる。また、第1溝部21の溝は、後縁部17(外周側後縁部17A)に沿う方向に対するピッチP1が、第2溝部22の溝のピッチP2よりも大きい溝を含んでいる。第1溝部21の溝は、後縁部17(外周側後縁部17A)に沿う方向に対する幅が、第2溝部22の溝の幅よりも大きい溝を含んでいてもよい。また、第1溝部21の溝の形状は、深さD1及びピッチP1が、第2溝部22の溝の深さD2及びピッチP2よりも大きい形状に限定されるものではなく、深さD1、ピッチP1の一方のみが大きい形状であってもよい。言い換えると、第1溝部21の溝と第2溝部22の溝は、外周側後縁部17A及び内周側後縁部17Bの正圧面12bにおける開口面積、すなわち大きさが互いに異なっている。なお、第1溝部21の溝及び第2溝部22の溝の深さD1、D2は、例えば翼12の正圧面12b側における寸法である。第1溝部21の溝の深さD1は、後述する補強部23を含めない寸法である。   More specifically, as shown in FIG. 5, the depth D1 of the first groove portion 21 extending from the rear edge portion 17 toward the front edge portion 16 is greater than the groove depth D2 of the second groove portion 22. Also contains large grooves. Further, the groove of the first groove portion 21 includes a groove in which the pitch P1 with respect to the direction along the rear edge portion 17 (outer peripheral side rear edge portion 17A) is larger than the pitch P2 of the groove of the second groove portion 22. The groove of the first groove portion 21 may include a groove whose width with respect to the direction along the rear edge portion 17 (outer peripheral side rear edge portion 17A) is larger than the width of the groove of the second groove portion 22. Further, the shape of the groove of the first groove portion 21 is not limited to the shape in which the depth D1 and the pitch P1 are larger than the groove depth D2 and the pitch P2 of the second groove portion 22, but the depth D1 and the pitch P1. Only one of P1 may have a large shape. In other words, the grooves of the first groove portion 21 and the grooves of the second groove portion 22 have different opening areas, that is, sizes, on the pressure surface 12b of the outer peripheral side rear edge portion 17A and the inner peripheral side rear edge portion 17B. The depths D1 and D2 of the grooves of the first groove portion 21 and the second groove portion 22 are, for example, dimensions on the pressure surface 12b side of the blade 12. The groove depth D1 of the first groove portion 21 is a dimension that does not include the reinforcing portion 23 described later.

ここで、例えば、第1溝部21の溝の深さD1は、第1溝部21の溝の両側に隣接する各外周側後縁部17Aの頂点間を結ぶ仮想線K1とその平行線K2を基準とした距離を指し、第1溝部21のピッチP1は、第1溝部21の両側に隣接する各外周側後縁部17Aの頂点間の距離を指す。第2溝部22の深さD2及びピッチP2についても、第1溝部21の深さD1及びピッチP1と同様に、第2溝部22の両側に隣接する各内周側後縁部17Bの頂点間を結ぶ仮想線K1とその平行線K2を基準とした距離、各内周側後縁部17Bの頂点間の距離を指す。   Here, for example, the depth D1 of the groove of the first groove portion 21 is based on an imaginary line K1 connecting the vertices of the outer peripheral rear edge portions 17A adjacent to both sides of the groove of the first groove portion 21 and its parallel line K2. The pitch P1 of the first groove portion 21 indicates the distance between the apexes of the outer peripheral rear edge portions 17A adjacent to both sides of the first groove portion 21. As for the depth D2 and the pitch P2 of the second groove portion 22, as well as the depth D1 and the pitch P1 of the first groove portion 21, between the apexes of the respective inner peripheral rear edge portions 17B adjacent to both sides of the second groove portion 22. The distance is based on the connecting virtual line K1 and the parallel line K2, and the distance between the vertices of each inner peripheral rear edge 17B.

図5に示すように、第2溝部22の、後縁部17から前縁部16へ向かって延びる深さD2方向が、ハブ11の径方向、つまり直線Lに対してなす角度θ2は、第1溝部21の深さD1方向が直線L(径方向)に対してなす角度θ1よりも小さい。角度θ1、θ2は、外周側後縁部17Aにおける空気の流れ方向F1と、内周側後縁部17Bにおける空気の流れ方向F2に基づいて設定されている。すなわち、第1溝部21は、外周側後縁部17Aにおける空気の流れ方向F1に沿う方向に沿って延びている。同様に、第2溝部22は、内周側後縁部17Bにおいて空気の流れ方向F2に沿う方向に延びている。   As shown in FIG. 5, the angle θ2 formed by the depth D2 direction of the second groove portion 22 extending from the rear edge portion 17 toward the front edge portion 16 with respect to the radial direction of the hub 11, that is, the straight line L, is The depth D1 direction of the one groove portion 21 is smaller than an angle θ1 formed with respect to the straight line L (radial direction). The angles θ1 and θ2 are set based on the air flow direction F1 in the outer peripheral side rear edge portion 17A and the air flow direction F2 in the inner peripheral side rear edge portion 17B. That is, the first groove portion 21 extends along a direction along the air flow direction F1 in the outer peripheral side rear edge portion 17A. Similarly, the 2nd groove part 22 is extended in the direction in alignment with the air flow direction F2 in the inner peripheral side rear edge part 17B.

(第1溝部の補強部)
図6は、実施例の軸流ファン5の翼12が有する第1溝部21の溝を拡大して示す斜視図である。図7は、実施例の軸流ファン5の翼12が有する第1溝部21の溝の補強部を拡大して示す斜視図である。図8は、実施例の軸流ファン5の翼12が有する第1溝部21の溝の補強部を示す断面図である。図9は、比較例の軸流ファンの翼12が有する第1溝部21の溝を示す断面図である。
(Reinforcing part of the first groove)
FIG. 6 is an enlarged perspective view showing the groove of the first groove portion 21 included in the blade 12 of the axial fan 5 of the embodiment. FIG. 7 is an enlarged perspective view showing the reinforcing portion of the groove of the first groove portion 21 included in the blade 12 of the axial fan 5 of the embodiment. FIG. 8 is a cross-sectional view illustrating a groove reinforcing portion of the first groove portion 21 included in the blade 12 of the axial fan 5 according to the embodiment. FIG. 9 is a cross-sectional view showing a groove of the first groove portion 21 included in the blade 12 of the axial fan of the comparative example.

また、本実施例における第1溝部21の溝内には、図6、図7及び図8に示すように、後縁部17を補強する補強部23が一体に形成されている。補強部23は、第1溝部21の溝内における前縁部16側の仮想上の端面21aから後縁部17側に突出すると共に、第1溝部21の溝内の対向する各内面21bに連結されており、いわゆる水かき状に形成されている。   Further, as shown in FIGS. 6, 7, and 8, a reinforcing portion 23 that reinforces the rear edge portion 17 is integrally formed in the groove of the first groove portion 21 in the present embodiment. The reinforcing portion 23 protrudes from the virtual end surface 21a on the front edge portion 16 side in the groove of the first groove portion 21 toward the rear edge portion 17 side, and is connected to each inner surface 21b facing in the groove of the first groove portion 21. It is formed in a so-called webbed shape.

図6及び図8に示すように、翼12の厚み方向に沿う断面(外周側後縁部17Aでの正圧面12bに直交する断面)において、第1溝部21の溝内の前縁部16側に位置する端面21aから、外周側後縁部17A側へ突出する方向の先端、すなわち補強部23の、後縁部17側へ突出する角部Sは、負圧面12aと正圧面12b(翼12の両面)との間に位置する。この角部Sは、第1溝部21の溝内の対向する各内面21bを結ぶ線上に位置している。   As shown in FIGS. 6 and 8, in the cross section along the thickness direction of the blade 12 (the cross section orthogonal to the pressure surface 12b at the outer peripheral side rear edge portion 17A), the front edge portion 16 side in the groove of the first groove portion 21 The end S in the direction protruding from the end surface 21a toward the outer peripheral side rear edge 17A, that is, the corner S of the reinforcing portion 23 protruding toward the rear edge 17 is the negative pressure surface 12a and the positive pressure surface 12b (blade 12). Between both sides). The corner portion S is located on a line connecting the inner surfaces 21 b facing each other in the groove of the first groove portion 21.

図8に示すように、外周側後縁部17Aでの正圧面12bに直交する断面において、補強部23は、負圧面12aから角部Sに向かって傾斜する第1傾斜面23aと、正圧面12bから角部Sに向かって傾斜する第2傾斜面23bと、を有する。第1傾斜面23aは、負圧面12aに連続する曲面状に形成されており、負圧面12aに対して鋭角をなしている。第2傾斜面23bは、正圧面12bに連続する平面状に形成されており、正圧面12bに対して鋭角をなしている。例えば、第2傾斜面23bは、正圧面12bに対して45度をなすC面として形成されている。なお、本実施例における第1傾斜面23aは、負圧面12aから緩やかに連続する曲面状に形成されているが、必要に応じて、第2傾斜面23bと同様に平面状に形成されてもよい。   As shown in FIG. 8, in the cross section orthogonal to the pressure surface 12b at the outer peripheral side rear edge portion 17A, the reinforcing portion 23 includes a first inclined surface 23a inclined from the suction surface 12a toward the corner portion S, and a pressure surface. And a second inclined surface 23b that inclines toward the corner portion S from 12b. The first inclined surface 23a is formed in a curved surface continuous with the suction surface 12a and forms an acute angle with the suction surface 12a. The second inclined surface 23b is formed in a planar shape that is continuous with the pressure surface 12b, and forms an acute angle with the pressure surface 12b. For example, the second inclined surface 23b is formed as a C surface that forms 45 degrees with respect to the positive pressure surface 12b. In addition, although the 1st inclined surface 23a in a present Example is formed in the curved surface shape which continues moderately from the negative pressure surface 12a, it may be formed in planar shape similarly to the 2nd inclined surface 23b as needed. Good.

補強部23は、角部Sを挟んで第1傾斜面23aと第2傾斜面23bとがなす角度(以下、角部Sがなす角度と称する)は、例えば鋭角であり、断面鋭角状に形成されている。なお、角部Sがなす角度は、必要に応じて90度以上の角度に設定されてもよい。   In the reinforcing portion 23, an angle formed by the first inclined surface 23a and the second inclined surface 23b across the corner portion S (hereinafter, referred to as an angle formed by the corner portion S) is an acute angle, for example, and is formed in an acute section shape. Has been. Note that the angle formed by the corner portion S may be set to an angle of 90 degrees or more as necessary.

図8に示すように、本実施例では、一例として、外周側後縁部17Aにおける正圧面12b上での第1溝部21の溝の深さD1が5mm程度、翼12の外周側後縁部17Aの厚みT1が2mm程度に形成されている。また、本実施例では、正圧面12bに沿う方向において補強部23の角部Sと、外周側後縁部17Aの正圧面12b上の縁との間の距離に相当する、補強部23の角部Sでの深さD3が3mm程度に形成されており、補強部23の角部Sと、外周側後縁部17Aの正圧面12bとの間の距離T2が1mm程度に形成されている。   As shown in FIG. 8, in this embodiment, as an example, the groove depth D1 of the first groove portion 21 on the pressure surface 12b of the outer peripheral side rear edge portion 17A is about 5 mm, and the outer peripheral side rear edge portion of the blade 12 is used. A thickness T1 of 17A is formed to be about 2 mm. In the present embodiment, the corner of the reinforcing portion 23 corresponds to the distance between the corner portion S of the reinforcing portion 23 and the edge of the outer peripheral side rear edge portion 17A on the positive pressure surface 12b in the direction along the positive pressure surface 12b. The depth D3 at the portion S is formed to be about 3 mm, and the distance T2 between the corner portion S of the reinforcing portion 23 and the positive pressure surface 12b of the outer peripheral side rear edge portion 17A is formed to be about 1 mm.

図9に示す比較例においても、実施例と同一の構成部分については、説明の便宜上、実施例と同一符号を付けて示す。図9に示すように、比較例では、翼12の外周側後縁部17Aの厚みT1が、実施例と同一である2mm程度である場合、第1溝部21の溝の機械的強度を適正に保つために、外周側後縁部17Aにおける正圧面12b上での第1溝部21の溝の深さD0が2.5mm程度となり、深さD0を十分に確保できないおそれがあった。   In the comparative example shown in FIG. 9 as well, the same components as those of the embodiment are denoted by the same reference numerals as those of the embodiment for convenience of explanation. As shown in FIG. 9, in the comparative example, when the thickness T1 of the outer peripheral side rear edge portion 17A of the blade 12 is about 2 mm which is the same as the embodiment, the mechanical strength of the groove of the first groove portion 21 is appropriately set. Therefore, the groove depth D0 of the first groove portion 21 on the positive pressure surface 12b in the outer peripheral side rear edge portion 17A is about 2.5 mm, and there is a possibility that the depth D0 cannot be sufficiently secured.

一方、上述のように実施例は、補強部23を有することで、比較例での深さD0が2.5mmであるのに比べて、第1溝部21の溝の深さD1を5.0mm程度まで大きくすることが可能になり、第1溝部21の溝の深さD1を実質的に2倍程度に大きくすることができる。これにより、外周側後縁部17Aにおける風速に応じた深さD1を有する第1溝部21の溝を形成することができる。   On the other hand, as described above, the embodiment has the reinforcing portion 23, so that the depth D1 of the first groove portion 21 is 5.0 mm compared to the depth D0 in the comparative example is 2.5 mm. It is possible to increase the depth D1 of the first groove portion 21 to substantially twice as much. Thereby, the groove | channel of the 1st groove part 21 which has the depth D1 according to the wind speed in 17 A of outer peripheral side rear edge parts can be formed.

なお、実施例では、補強部23は、第1溝部21の溝内に設けられたが、この構成に限定するものではない。補強部23は、第2溝部22の溝内にも、第1溝部21の溝と同様に設けられてもよく、第1溝部21の溝内に設けずに第2溝部22の溝内のみに設けられてもよい。また、切り欠き部18の内側に設けられていてもよい。   In addition, in the Example, although the reinforcement part 23 was provided in the groove | channel of the 1st groove part 21, it is not limited to this structure. The reinforcing portion 23 may be provided in the groove of the second groove portion 22 in the same manner as the groove of the first groove portion 21, and only in the groove of the second groove portion 22 without being provided in the groove of the first groove portion 21. It may be provided. Further, it may be provided inside the notch 18.

(第1溝部及び第2溝部の作用)
翼12において、外周側後縁部17Aにおける風速が、内周側後縁部17Bにおける風速に比べて大きいので、外周側後縁部17Aの第1溝部21の溝の深さD1、ピッチP1、幅等が、内周側後縁部17Bの第2溝部22の溝の深さD2、ピッチP2、幅等よりも大きくされることで、第1溝部21の溝及び第2溝部22の溝は、外周側後縁部17Aと内周側後縁部17Bでの空気の流れに応じた所望の深さ、ピッチ、幅となるように形成されている。これによって、空気の流れによる騒音の発生を低減するという溝による本来の作用を十分に得ることが可能になる。
(Operation of the first groove and the second groove)
In the blade 12, since the wind speed at the outer peripheral side rear edge portion 17A is larger than the wind speed at the inner peripheral side rear edge portion 17B, the groove depth D1, the pitch P1, the first groove portion 21 of the outer peripheral side rear edge portion 17A, The width and the like are larger than the depth D2, the pitch P2, the width, and the like of the second groove portion 22 of the inner peripheral side rear edge portion 17B, so that the groove of the first groove portion 21 and the groove of the second groove portion 22 are The outer peripheral side rear edge 17A and the inner peripheral rear edge 17B are formed to have a desired depth, pitch, and width according to the air flow. As a result, it is possible to sufficiently obtain the original action by the groove to reduce the generation of noise due to the air flow.

また、第1溝部21の溝が、外周側後縁部17Aにおける空気の流れ方向F1に沿う方向に沿って延びており、第2溝部22の溝が、内周側後縁部17Bにおいて空気の流れ方向F2に沿う方向に延びている。このように第1溝部21の溝及び第2溝部22の溝は、後縁部17における空気の流れ方向F1、F2にそれぞれ応じた適正な形状に形成されている。したがって、軸流ファン5では、第1溝部21及び第2溝部22が、翼12の後縁部17に生じる渦の大きさを効果的に細分化することにより、空気の流れによる騒音の発生を低減する効果が高められている。   Further, the groove of the first groove portion 21 extends along a direction along the air flow direction F1 in the outer peripheral side rear edge portion 17A, and the groove of the second groove portion 22 extends in the air at the inner peripheral side rear edge portion 17B. It extends in the direction along the flow direction F2. As described above, the groove of the first groove portion 21 and the groove of the second groove portion 22 are formed in appropriate shapes according to the air flow directions F1 and F2 at the rear edge portion 17, respectively. Therefore, in the axial fan 5, the first groove portion 21 and the second groove portion 22 effectively subdivide the size of the vortex generated at the trailing edge portion 17 of the blade 12, thereby generating noise due to the air flow. The effect of reducing is enhanced.

また、第1溝部21は、第1傾斜面23a及び第2傾斜面23bを有する補強部23が設けられることで、外周側後縁部17Aの機械的強度が適正に確保されるので、深さD1を大きく形成することが可能となる。具体的には、第1溝部21において、負圧面12a及び正圧面12bのそれぞれにおいて、図8に示すように、外周側後縁部17A側へ角部Sに向かって鋭角をなして傾斜する切り込み部分を有することで、負圧面12a及び正圧面12bで外周側後縁部17Aに生じる渦を細分化する作用が適正に得られる。   Further, since the first groove portion 21 is provided with the reinforcing portion 23 having the first inclined surface 23a and the second inclined surface 23b, the mechanical strength of the outer peripheral side rear edge portion 17A is appropriately ensured. D1 can be formed large. Specifically, in the first groove portion 21, in each of the negative pressure surface 12 a and the positive pressure surface 12 b, as shown in FIG. 8, an incision inclined at an acute angle toward the corner portion S toward the outer peripheral side rear edge portion 17 A side. By having the portion, the effect of subdividing the vortex generated in the outer peripheral side rear edge portion 17A at the suction surface 12a and the pressure surface 12b is appropriately obtained.

上述のように、実施例の軸流ファン5において、補強部23は、第1溝部21の溝内の、前縁部16側の端面21aから、後縁部17側へ突出すると共に第1溝部21の溝の対向する各内面21bに連結されており、翼12の厚み方向に沿う断面において補強部23の、後縁部17側へ突出する角部Sが、翼12の負圧面12aと正圧面12bとの間に位置する。このように補強部23を有することにより、後縁部17における空気の流れによる騒音の発生を抑える作用を高めると共に、翼12の外周側後縁部17Aの機械的強度を適正に確保することができる。加えて、補強部23の角部Sが負圧面12aと正圧面12bとの間に位置することで、軸流ファン5の成形金型の加工が容易になり、翼12の成形性を高めることができる。   As described above, in the axial fan 5 of the embodiment, the reinforcing portion 23 protrudes from the end surface 21a on the front edge portion 16 side in the groove of the first groove portion 21 toward the rear edge portion 17 side, and the first groove portion. The corner portion S of the reinforcing portion 23 that protrudes toward the trailing edge 17 in the cross section along the thickness direction of the blade 12 is connected to the suction surface 12a of the blade 12 and the positive pressure surface 12a. It is located between the pressure surface 12b. Thus, by having the reinforcement part 23, while improving the effect | action which suppresses generation | occurrence | production of the noise by the air flow in the trailing edge part 17, the mechanical strength of the outer peripheral side trailing edge part 17A of the wing | blade 12 can be ensured appropriately. it can. In addition, since the corner portion S of the reinforcing portion 23 is located between the suction surface 12a and the pressure surface 12b, processing of the molding die of the axial fan 5 is facilitated, and the moldability of the blade 12 is improved. Can do.

特に大型の軸流ファンの場合には、第1溝部21の溝の深さD1が大きくなるので、補強部23が有効である。また、大型の軸流ファンでは、補強部23によって後縁部17の振動も抑えることが可能になる。   In particular, in the case of a large axial fan, the groove depth D1 of the first groove portion 21 is increased, so that the reinforcing portion 23 is effective. Further, in the large axial fan, the reinforcing portion 23 can also suppress the vibration of the rear edge portion 17.

また、上述のように、実施例の軸流ファン5における補強部23は、負圧面12aから角部Sに向かって傾斜する第1傾斜面23aと、正圧面12bから角部Sに向かって傾斜する第2傾斜面23bと、を有する。これにより、負圧面12aと正圧面12bの両方に切り込み部分を有する形状となり、外周側後縁部17Aで生じる気流の渦を小さくして騒音を抑える作用を高めることができる。加えて、軸流ファン5の成形金型の加工性、翼12の成形性を更に高めることが可能になる。   Further, as described above, the reinforcing portion 23 in the axial fan 5 of the embodiment is inclined toward the corner portion S from the first pressure surface 12a and the first inclined surface 23a inclined from the suction surface 12a toward the corner portion S. Second inclined surface 23b. Thereby, it becomes a shape which has a cut | notch part in both the negative pressure surface 12a and the positive pressure surface 12b, and the effect | action which suppresses a noise by making small the eddy of the airflow produced in the outer peripheral side rear edge part 17A can be heightened. In addition, the workability of the mold for the axial fan 5 and the moldability of the blades 12 can be further enhanced.

また、上述のように、実施例の軸流ファン5における補強部23は、第1傾斜面23a及び第2傾斜面23bの少なくとも一方が平面である。これにより、軸流ファン5の成形金型の加工性、翼12の成形性を更に高めることが可能になる。   Further, as described above, in the reinforcing portion 23 in the axial fan 5 of the embodiment, at least one of the first inclined surface 23a and the second inclined surface 23b is a flat surface. Thereby, it becomes possible to further improve the workability of the molding die of the axial fan 5 and the moldability of the blades 12.

また、上述のように、実施例の軸流ファン5は、第1溝部21と同様に、第2溝部22内に補強部23が設けられてもよい。これにより、内周側後縁部17Bにおける風速に応じて、第2溝部22の溝の深さD2を適正な大きさに形成することできるので、後縁部17における空気の流れによる騒音の発生を更に効果的に抑えることができる。   In addition, as described above, the axial fan 5 of the embodiment may be provided with the reinforcing portion 23 in the second groove portion 22, similarly to the first groove portion 21. Accordingly, the groove depth D2 of the second groove portion 22 can be formed in an appropriate size according to the wind speed at the inner peripheral side rear edge portion 17B, so that noise is generated due to the air flow at the rear edge portion 17. Can be more effectively suppressed.

以上、実施例を説明したが、上述した内容により実施例が限定されるものではない。また、上述した構成要素には、当業者が容易に想定できるもの、実質的に同一のもの、いわゆる均等の範囲のものが含まれる。さらに、上述した構成要素は適宜組み合わせることが可能である。さらに、実施例の要旨を逸脱しない範囲で構成要素の種々の省略、置換及び変更のうち少なくとも1つを行うことができる。   Although the embodiments have been described above, the embodiments are not limited to the above-described contents. In addition, the above-described components include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the above-described components can be appropriately combined. Furthermore, at least one of various omissions, substitutions, and changes of the components can be made without departing from the scope of the embodiments.

1 室外機
3 圧縮機
4 熱交換器
5 軸流ファン
11 ハブ
12 翼
12a 負圧面
12b 正圧面
16 前縁部
17 後縁部
17A 外周側後縁部
17B 内周側後縁部
18 切り欠き部
19 突出部
21 第1溝部
21a 端面
21b 内面
22 第2溝部
23 補強部
23a 第1傾斜面
23b 第2傾斜面
D0、D1、D2、D3 深さ
R 回転方向
S 頂点
DESCRIPTION OF SYMBOLS 1 Outdoor unit 3 Compressor 4 Heat exchanger 5 Axial fan 11 Hub 12 Wing | wing 12a Negative pressure surface 12b Positive pressure surface 16 Front edge part 17 Rear edge part 17A Outer peripheral side rear edge part 17B Inner peripheral side rear edge part 18 Notch part 19 Projection portion 21 First groove portion 21a End surface 21b Inner surface 22 Second groove portion 23 Reinforcement portion 23a First inclined surface 23b Second inclined surface D0, D1, D2, D3 Depth R Rotation direction S Vertex

Claims (5)

ハブと、前記ハブの周方向に設けられた複数の翼と、を備え、
前記翼には、前記翼の回転方向における前縁部の反対側の後縁部に、当該後縁部を外周側後縁部と内周側後縁部とに分ける切り欠き部が、前記後縁部から前記前縁部へ向かって延びて形成され、
前記外周側後縁部には、前記翼の厚み方向に貫通して前記前縁部へ向かって延びる複数の溝で形成される第1溝部が、前記外周側後縁部に沿って設けられ、
前記翼には、前記後縁部を補強する補強部が設けられ、当該補強部は、前記第1溝部の溝内の、前記前縁部側の端面から、前記後縁部側へ突出すると共に前記第1溝部の溝の対向する各内面に連結され、
前記翼の厚み方向に沿う断面において、前記補強部の、前記後縁部側へ突出する角部は、前記翼の厚み方向における負圧面と正圧面との間に位置する、軸流ファン。
A hub, and a plurality of wings provided in the circumferential direction of the hub,
The wing has a notch that divides the rear edge into an outer peripheral rear edge and an inner peripheral rear edge at the rear edge opposite to the front edge in the rotational direction of the wing. Formed extending from the edge toward the front edge,
The outer peripheral side rear edge portion is provided with a first groove portion formed by a plurality of grooves that penetrates in the thickness direction of the blade and extends toward the front edge portion, along the outer peripheral side rear edge portion,
The wing is provided with a reinforcing portion that reinforces the rear edge portion, and the reinforcing portion protrudes from the end surface on the front edge portion side in the groove of the first groove portion toward the rear edge portion side. Connected to the inner surfaces of the first groove portion facing each other,
In the cross section along the thickness direction of the blade, the corner portion of the reinforcing portion that protrudes toward the trailing edge is positioned between the suction surface and the pressure surface in the blade thickness direction.
前記補強部は、前記負圧面から前記角部に向かって傾斜する第1傾斜面と、前記正圧面から前記角部に向かって傾斜する第2傾斜面と、を有し、
前記第1傾斜面及び前記第2傾斜面の少なくとも一方は平面である、
請求項1に記載の軸流ファン。
The reinforcing portion includes a first inclined surface that is inclined from the suction surface toward the corner portion, and a second inclined surface that is inclined from the pressure surface toward the corner portion,
At least one of the first inclined surface and the second inclined surface is a plane.
The axial fan according to claim 1.
前記内周側後縁部には、前記翼の厚み方向に貫通して前記前縁部へ向かって延びる複数の溝で形成される第2溝部が、前記内周側後縁部に沿って設けられ、
前記補強部は、前記切り欠き部の内側の、前記前縁部側の端面から、前記後縁部側へ突出すると共に前記第2溝部の溝の対向する各内面に連結されている、
請求項1または2に記載の軸流ファン。
A second groove portion formed by a plurality of grooves extending in the thickness direction of the blade and extending toward the front edge portion is provided along the inner periphery side rear edge portion in the inner periphery side rear edge portion. And
The reinforcing portion protrudes from the end surface on the front edge portion side inside the notch portion to the rear edge portion side and is connected to each inner surface facing the groove of the second groove portion.
The axial fan according to claim 1 or 2.
前記内周側後縁部には、前記翼の厚み方向に貫通して前記前縁部へ向かって延びる複数の溝で形成される第2溝部が、前記内周側後縁部に沿って設けられ、
前記補強部は、前記第2溝部内の溝の、前記前縁部側の端面から、前記後縁部側へ突出すると共に前記第2溝部の溝の対向する各内面に連結されている、
請求項1ないし3のいずれか1項に記載の軸流ファン。
A second groove portion formed by a plurality of grooves extending in the thickness direction of the blade and extending toward the front edge portion is provided along the inner periphery side rear edge portion in the inner periphery side rear edge portion. And
The reinforcing portion protrudes from the end surface on the front edge portion side of the groove in the second groove portion to the rear edge portion side and is connected to each inner surface facing the groove of the second groove portion.
The axial fan according to any one of claims 1 to 3.
冷媒を圧縮する圧縮機と、
前記圧縮機に連結されて前記冷媒が流れる熱交換器と、
前記熱交換器に送風する、請求項1ないし4のいずれか1項に記載の軸流ファンと、
を備える、室外機。
A compressor for compressing the refrigerant;
A heat exchanger connected to the compressor and through which the refrigerant flows;
The axial fan according to any one of claims 1 to 4, which blows air to the heat exchanger;
An outdoor unit.
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AU2017206193A AU2017206193B2 (en) 2016-09-02 2017-07-19 Axial fan and outdoor unit
US15/660,067 US10400604B2 (en) 2016-09-02 2017-07-26 Axial fan with grooved trailing edge and outdoor unit
CN201710618600.8A CN107795516B (en) 2016-09-02 2017-07-26 Axial fan and outdoor unit
EP17184976.3A EP3290715B1 (en) 2016-09-02 2017-08-04 Axial fan and outdoor unit

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CN104061187A (en) * 2014-06-30 2014-09-24 珠海格力电器股份有限公司 Axial-flow fan blade, axial-flow fan and air conditioner

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JPH0261400A (en) * 1988-08-29 1990-03-01 Hitachi Ltd Axial flow fan
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CN113994102A (en) * 2019-06-25 2022-01-28 三菱电机株式会社 Axial fan, blower device, and refrigeration cycle device
CN113994102B (en) * 2019-06-25 2023-10-03 三菱电机株式会社 Axial fan, blower device, and refrigeration cycle device

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