JP2009024653A - Mixed flow blower impeller and air conditioner - Google Patents
Mixed flow blower impeller and air conditioner Download PDFInfo
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Abstract
Description
本発明は、空気調和機の室外機などに用いられる熱交換促進用の送風機に関するもので、特に送風機の低騒音化と静圧効率向上の技術に関するものである。 The present invention relates to a heat exchange promoting blower used for an outdoor unit of an air conditioner, and more particularly to a technique for reducing noise of a blower and improving static pressure efficiency.
この種の空気調和機は、熱交換器と送風機とを有する室内機と、圧縮機と熱交換器と送風機とを有する室外機とを接続配管で結んで冷凍サイクルを形成し、冷凍サイクル内に充填した冷媒の熱搬送によって冷房運転や暖房運転することによって室内の空気調和を行うものである。この室外機に備えられる熱交換促進用の送風機としての斜流送風機羽根車がに関する技術が特許文献1に開示されている。 This type of air conditioner forms a refrigeration cycle by connecting an indoor unit having a heat exchanger and a blower, and an outdoor unit having a compressor, a heat exchanger, and a blower with a connecting pipe. Indoor air conditioning is performed by performing cooling operation or heating operation by heat transfer of the filled refrigerant. Patent Document 1 discloses a technique related to a mixed flow blower impeller as a blower for promoting heat exchange provided in the outdoor unit.
図10は、従来の斜流送風機羽根車の子午面図である。21が翼、22が略円錐台状ハブ、23が前縁、24が後縁、25が外周を示している。翼21の子午面における前縁23が、ハブ22と外周25の中点(D−D)付近より外周側が風上側に対して凹状でハブ側が風上側に対して凸状の曲線で構成している。
しかしながら、上記従来の構成では、翼21の半径方向断面形状で外周側凹部が洩れ流れを一因として生成する翼端渦を促進させて、ハブ側凸部が外周より流入する半径方向流入を円滑化させる。その結果として、Ф415の斜流送風機の静圧向上と約2dBの低騒音化に効果が存在した。しかし、静圧効率向上の寄与が少なく、低騒音化に上記の様に一定の限界が存在した。 However, in the above-described conventional configuration, the blade-side vortex promotes the blade tip vortex generated by the outer circumferential concave portion due to the leakage flow in the radial cross-sectional shape of the blade 21, and the hub-side convex portion smoothes the radial inflow from the outer circumference. Make it. As a result, there was an effect in improving the static pressure of the mixed flow blower of の 415 and reducing the noise by about 2 dB. However, there was little contribution to improving the static pressure efficiency, and there was a certain limit to reducing noise as described above.
本発明は、前記従来の課題を解決するもので、特に送風機の静圧効率向上とより一層の低騒音化、更には送風機の製作コスト低減を実現する空気調和機用斜流送風機羽根車を提供する事を目的とする。 The present invention solves the above-mentioned conventional problems, and in particular, provides a mixed flow fan impeller for an air conditioner that realizes an improvement in static pressure efficiency and further noise reduction of the blower, and further reduces the manufacturing cost of the blower. The purpose is to do.
前記従来の課題を解決する為に、本発明の斜流送風機羽根車は、略円錐台状のハブと、このハブに設けた2枚の翼とを備え、翼は、翼の自乗平均半径位置での翼弦長Lと翼の半径方向代表実長さbの比であるアスペクト比b/L≦1.1の範囲に設定し、且つこの範囲のアスペクト比で翼枚数を2枚から構成し、翼の子午面において前縁は翼外周側から2/3位置付近を境目として外周側は風上側に対して凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成し、かつ翼の半径方向断面の外周側から2/3位置を境目として外周側は風上側に対し凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成し、且つ前縁は螺旋曲線で構成し、且つ翼の外周側弦長が前記ハブ側弦長より長く構成してなるものである。 In order to solve the above-mentioned conventional problems, the mixed flow fan impeller of the present invention includes a substantially truncated cone-shaped hub and two blades provided on the hub, and the blades are the mean square radial position of the blades. The aspect ratio b / L ≦ 1.1, which is the ratio between the chord length L and the representative actual length b in the radial direction of the wing, and the number of blades is composed of two with the aspect ratio within this range. On the meridional surface of the wing, the leading edge is composed of a curve that is concave with respect to the windward side at the 2/3 position from the outer periphery of the blade, and the hub side is composed of a convex curve with respect to the windward side. And the outer peripheral side is configured with a concave curve with respect to the windward side, and the hub side is configured with a convex curve with respect to the windward side, with the 2/3 position from the outer peripheral side of the radial cross section of the blade as the boundary, and the leading edge Is formed by a spiral curve, and the outer chord length of the wing is longer than the hub chord length.
これによって、アスペクト比b/L≦1.1からなる2枚翼で構成しているために、適正な翼弦長を保ち最小翼枚数であるので流体仕事を実施する翼面積が最小である為に、流体摩擦が最も少なく送風機としての静圧効率を最も高く設定することができる。かつ翼の半径方向断面の外周側から2/3位置付近を境目として外周側は風上側に対し凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成しているので、翼端に発生する洩れ流れを一因として生成する翼端渦を、翼の半径方向断面の外周側から2/3位置付近を境目として外周側は風上側に対し凹形状部分で促進させる事ができ、外周側から2/3位置
付近までとする寸法が適正であるので、翼端渦生成促進作用にとって最も有効であるので、流体現象として翼端渦の生成促進が却って音響4極子騒音を低減し低騒音化に繋がる技術であり、音響4極子騒音をより効果的に低減でき、最も低騒音化に寄与できる。外周側から2/3位置付近よりハブ側は風上側に対し凸形状の曲線で構成されるので、翼の半径方向断面形状で考える時、翼外周からの半径方向流入を充分に促進できるので静圧を充分に高める事ができる。そして、前縁は螺旋曲線で構成されているので空気を時間をずらせて滑らかに切り進むことが出来るので低騒音であり、翼の外周側弦長がハブ側弦長より長く構成しているので最も翼にかかる空力負荷の高い部分の翼面積投入が適正となるので、アスペクト比b/L≦1.1からなる2枚翼としての構成と相まって送風機としての静圧効率をより高く発揮できる。
As a result, since the blade is composed of two blades having an aspect ratio of b / L ≦ 1.1, the blade area for performing fluid work is the smallest because the blade has a proper chord length and the minimum number of blades. Moreover, the static pressure efficiency as the blower can be set to the highest with the least fluid friction. And since the outer peripheral side is configured with a concave curve with respect to the windward side and the hub side is configured with a convex curve with respect to the windward side, with the vicinity of 2/3 position from the outer peripheral side of the radial cross section of the blade as the boundary, It is possible to promote the tip vortex generated due to the leakage flow generated at the tip of the blade with a concave shape part on the outer peripheral side with respect to the windward side at the 2/3 position from the outer peripheral side of the radial cross section of the blade. Since the dimensions from the outer periphery to the 2/3 position are appropriate, it is the most effective for the blade tip vortex generation promoting action, so the generation of the blade tip vortex is promoted as a fluid phenomenon, reducing acoustic quadrupole noise. However, this is a technology that leads to a reduction in noise, can effectively reduce acoustic quadrupole noise, and can contribute most to noise reduction. Since the hub side is formed with a convex curve from the vicinity of the 2/3 position from the outer peripheral side, the radial inflow from the outer periphery of the blade can be sufficiently promoted when considering the radial sectional shape of the blade. The pressure can be increased sufficiently. And since the leading edge is composed of a spiral curve, the air can be smoothly cut by shifting the time, so the noise is low and the wing outer chord length is longer than the hub chord length. Since it is appropriate to insert the blade area of the portion with the highest aerodynamic load on the blade, the static pressure efficiency as a blower can be further enhanced in combination with the configuration of two blades having an aspect ratio of b / L ≦ 1.1.
アスペクト比b/L≦1.1からなる2枚翼で構成しているために、適正な翼弦長を保ち最小翼枚数であるので流体仕事を実施する翼面積が最小である為に、流体摩擦が最も少なく送風機としての静圧効率を最も高く設定することができる。かつ翼の半径方向断面の外周側から2/3位置付近を境目として外周側は風上側に対し凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成しているので、翼端に発生する洩れ流れを一因として生成する翼端渦を、翼の半径方向断面の外周側から2/3位置付近を境目として外周側は風上側に対し凹形状部分で促進させる事ができ、外周側から2/3位置付近までとする寸法が適正であるので、翼端渦生成促進作用にとって最も有効であるので、流体現象として翼端渦の生成促進が却って音響4極子騒音を低減し低騒音化に繋がる技術であり、音響4極子騒音をより効果的に低減でき、最も低騒音化に寄与できる。外周側から2/3位置付近よりハブ側は風上側に対し凸形状の曲線で構成されるので、翼の半径方向断面形状で考える時、翼外周からの半径方向流入を充分に促進できるので静圧を充分に高める事ができる。そして、前縁は螺旋曲線で構成されているので空気を時間をずらせて滑らかに切り進むことが出来るので低騒音であり、翼の外周側弦長がハブ側弦長より長く構成しているので最も翼にかかる空力負荷の高い部分の翼面積投入が適正となるので、アスペクト比b/L≦1.1からなる2枚翼としての構成と相まって送風機としての静圧効率をより高く発揮できる。 Since it is composed of two blades having an aspect ratio of b / L ≦ 1.1, the blade area for performing fluid work is the smallest because the minimum blade number is maintained while maintaining an appropriate chord length. The static pressure efficiency as a blower can be set to the highest with the least friction. And since the outer peripheral side is configured with a concave curve with respect to the windward side and the hub side is configured with a convex curve with respect to the windward side, with the vicinity of 2/3 position from the outer peripheral side of the radial cross section of the blade as the boundary, It is possible to promote the tip vortex generated due to the leakage flow generated at the tip of the blade with a concave shape part on the outer peripheral side with respect to the windward side at the 2/3 position from the outer peripheral side of the radial cross section of the blade. Since the dimensions from the outer periphery to the 2/3 position are appropriate, it is the most effective for the blade tip vortex generation promoting action, so the generation of the blade tip vortex is promoted as a fluid phenomenon, reducing acoustic quadrupole noise. This is a technology that leads to a reduction in noise, can effectively reduce acoustic quadrupole noise, and can contribute most to the reduction in noise. Since the hub side is formed with a convex curve from the vicinity of the 2/3 position from the outer peripheral side, the radial inflow from the outer periphery of the blade can be sufficiently promoted when considering the radial sectional shape of the blade. The pressure can be increased sufficiently. And since the leading edge is composed of a spiral curve, the air can be smoothly cut by shifting the time, so the noise is low and the wing outer chord length is longer than the hub chord length. Since it is appropriate to insert the blade area of the portion with the highest aerodynamic load on the blade, the static pressure efficiency as a blower can be further enhanced in combination with the configuration of two blades having an aspect ratio of b / L ≦ 1.1.
第一の発明は、斜流送風機羽根車は、略円錐台状のハブと、このハブに設けた2枚の翼とを備え、翼は、翼の自乗平均半径位置での翼弦長Lと翼の半径方向代表実長さbの比であるアスペクト比b/L≦1.1の範囲に設定し、且つこの範囲のアスペクト比で翼枚数を2枚から構成し、翼の子午面において前縁は翼外周側から2/3位置付近を境目として外周側は風上側に対して凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成し、かつ翼の半径方向断面の外周側から2/3位置を境目として外周側は風上側に対し凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成し、且つ前縁は螺旋曲線で構成し、且つ翼の外周側弦長が前記ハブ側弦長より長く構成してなるものである。 According to a first aspect of the present invention, a mixed-flow fan impeller includes a substantially truncated cone-shaped hub and two blades provided on the hub. The blade has a chord length L at a mean square radius position of the blade, and The aspect ratio b / L ≦ 1.1, which is the ratio of the representative actual length b in the radial direction of the wing, is set in a range of two wings with the aspect ratio within this range. The edge is composed of a curve that is concave with respect to the windward side, and the hub side is formed with a convex curve with respect to the windward side. 2/3 from the outer peripheral side of the outer periphery side is configured with a concave curve with respect to the windward side, the hub side is configured with a convex curve with respect to the windward side, and the leading edge is configured with a spiral curve, In addition, the outer chord length of the blade is longer than the hub chord length.
これによって、アスペクト比b/L≦1.1からなる2枚翼で構成しているために、適正な翼弦長を保ち最小翼枚数であるので流体仕事を実施する翼面積が最小である為に、流体摩擦が最も少なく送風機としての静圧効率を最も高く設定することができる。かつ翼の半径方向断面の外周側から2/3位置付近を境目として外周側は風上側に対し凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成しているので、翼端に発生する洩れ流れを一因として生成する翼端渦を、翼の半径方向断面の外周側から2/3位置付近を境目として外周側は風上側に対し凹形状部分で促進させる事ができ、外周側から2/3位置付近までとする寸法が適正であるので、翼端渦生成促進作用にとって最も有効であるので、流体現象として翼端渦の生成促進が却って音響4極子騒音を低減し低騒音化に繋がる技術であり、音響4極子騒音をより効果的に低減でき、最も低騒音化に寄与できる。外周側
から2/3位置付近よりハブ側は風上側に対し凸形状の曲線で構成されるので、翼の半径方向断面形状で考える時、翼外周からの半径方向流入を充分に促進できるので静圧を充分に高める事ができる。そして、前縁は螺旋曲線で構成されているので空気を時間をずらせて滑らかに切り進むことが出来るので低騒音であり、翼の外周側弦長がハブ側弦長より長く構成しているので最も翼にかかる空力負荷の高い部分の翼面積投入が適正となるので、アスペクト比b/L≦1.1からなる2枚翼としての構成と相まって送風機としての静圧効率をより高く発揮できる。
As a result, since the blade is composed of two blades having an aspect ratio of b / L ≦ 1.1, the blade area for performing fluid work is the smallest because the blade has a proper chord length and the minimum number of blades. Moreover, the static pressure efficiency as the blower can be set to the highest with the least fluid friction. And since the outer peripheral side is configured with a concave curve with respect to the windward side and the hub side is configured with a convex curve with respect to the windward side, with the vicinity of 2/3 position from the outer peripheral side of the radial cross section of the blade as the boundary, It is possible to promote the tip vortex generated due to the leakage flow generated at the tip of the blade with a concave shape part on the outer peripheral side with respect to the windward side at the 2/3 position from the outer peripheral side of the radial cross section of the blade. Since the dimensions from the outer periphery to the 2/3 position are appropriate, it is the most effective for the blade tip vortex generation promoting action, so the generation of the blade tip vortex is promoted as a fluid phenomenon, reducing acoustic quadrupole noise. However, this is a technology that leads to a reduction in noise, can effectively reduce acoustic quadrupole noise, and can contribute most to noise reduction. Since the hub side is formed with a convex curve from the vicinity of the 2/3 position from the outer peripheral side, the radial inflow from the outer periphery of the blade can be sufficiently promoted when considering the radial sectional shape of the blade. The pressure can be increased sufficiently. And since the leading edge is composed of a spiral curve, the air can be smoothly cut by shifting the time, so the noise is low and the wing outer chord length is longer than the hub chord length. Since it is appropriate to insert the blade area of the portion with the highest aerodynamic load on the blade, the static pressure efficiency as a blower can be further enhanced in combination with the configuration of two blades having an aspect ratio of b / L ≦ 1.1.
第二の発明は、略円錐台状のハブと、このハブに設けた2枚の翼とを備え、翼は、翼の自乗平均半径位置での翼弦長Lと翼の半径方向代表実長さbの比であるアスペクト比b/L≦1.1の範囲に設定し、かつこの範囲のアスペクト比で翼枚数を2枚から構成し、翼の子午面において前縁は翼外周側から1/3位置付近を境目として外周側は風上側に対して凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成し、かつ翼の半径方向断面の外周側から2/3位置を境目として外周側は風上側に対し凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成し、且つ翼の外周側弦長がハブ側弦長より長く構成し、翼は、この翼の前傾直線からなる前縁と外周の交点に三角形状翼の一点を合わせ、且つ前縁に三角形状翼の一辺を重ねて翼半径を同一となるように三角形状翼を設けてなる斜流送風機羽根車を提供してなるものである。 The second invention comprises a substantially frustoconical hub and two wings provided on the hub, and the wing has a chord length L at a mean square radius position of the wing and a representative radial length in the radial direction of the wing. The aspect ratio b / L ≦ 1.1, which is the ratio of the height b, and the number of blades is composed of two blades with the aspect ratio within this range, and the leading edge of the blade meridian surface is 1 from the blade outer peripheral side. / 3 The boundary of the outer periphery is a concave curve with respect to the windward side, and the hub side is a convex curve with respect to the windward side, and 2/3 from the outer peripheral side of the radial cross section of the blade. With the position as a boundary, the outer peripheral side is configured with a concave curve with respect to the windward side, the hub side is configured with a convex curve with respect to the windward side, and the outer peripheral side chord length of the wing is configured to be longer than the hub side chord length, For the wing, align one point of the triangular wing at the intersection of the leading edge and the outer periphery consisting of the forward inclined straight line of this wing, and one side of the triangular wing at the leading edge. Is made to provide a mixed flow fan impeller formed by providing a triangular wings like wings radius the same sleeping.
これによって、第一の発明との相違点は、この翼の前傾直線からなる前縁と外周の交点に三角形状翼の一点を重ね、且つ前縁に三角形状翼の一辺を密着させて翼半径を同一となるように三角形状翼を設けてなる斜流送風機羽根車を提供してなる点である。前縁が前傾直線で構成されているので、空気を時間をずらせて滑らかに切り進む事が出来るので低騒音である。上記三角上翼の頂点が翼端渦生成の起点とすることができるので、翼端渦をより明確に生成促進させる作用を有するので、流体現象として翼端渦の生成促進が却って音響4極子騒音を低減し低騒音化に繋がる技術である。 As a result, the difference from the first invention is that one point of the triangular wing is overlapped at the intersection of the front edge and the outer periphery formed of the forward inclined straight line of the wing, and one side of the triangular wing is closely attached to the front edge. It is a point which provides the mixed flow fan impeller which provides a triangular blade | wing with the same radius. Since the front edge is composed of a straight line that is inclined forward, the air can be smoothly cut by shifting the time, resulting in low noise. Since the apex of the triangular upper wing can be a starting point for generating the tip vortex, the tip vortex has a function of more clearly promoting the generation of the tip vortex. This is a technology that reduces noise and reduces noise.
第三の発明は、この翼の後縁は、子午面において外周側とハブの中点付近より外周側は直線状で構成し、ハブ側は風上側に対して凸形状で構成してなる第一の発明或は第二の発明に記載の斜流送風機羽根車を提供してなるものである。 According to a third aspect of the present invention, the trailing edge of the wing is configured to have a linear shape on the outer peripheral side and the vicinity of the midpoint of the hub on the meridian surface, and the hub side has a convex shape with respect to the windward side. The mixed flow blower impeller described in one invention or the second invention is provided.
これによって、翼の後縁側ハブ近傍は、流体仕事に寄与しないので、上記のようにその部分の翼面積を少なくする事は、流体摩擦を減少させて送風機の静圧効率をより高める事ができ、且つ低騒音化にも寄与できるものである。この効果が、第一の発明や第二の発明に相乗して、その効果を発揮できるものである。 As a result, the vicinity of the hub on the trailing edge side of the blade does not contribute to fluid work, so reducing the blade area of that portion as described above can reduce fluid friction and increase the static pressure efficiency of the blower. In addition, it can contribute to noise reduction. This effect is synergistic with the first invention and the second invention, and the effect can be exhibited.
第四の発明は、第一の発明から第三の発明記載のいずれかの一つの発明に記載の斜流送風機羽根車を有する送風機を、熱交換器や圧縮機などを有するルームエアコン室外機に設けた空気調和機を提供してなるものである。 A fourth invention relates to a room air conditioner outdoor unit having a heat exchanger, a compressor, etc., with the blower having the mixed flow blower impeller described in any one of the first to third inventions. An air conditioner provided is provided.
これによって、最も静圧効率の高くて低騒音である斜流送風機をルームエアコン室外機に適用するので、ルームエアコン全体のCOPを向上させることが出来て、且つその作動騒音を低くできるものである。 As a result, the mixed flow blower having the highest static pressure efficiency and low noise is applied to the outdoor unit of the room air conditioner, so that the COP of the entire room air conditioner can be improved and its operating noise can be reduced. .
(実施の形態1)
図1は、本発明の第一の実施の形態における斜流送風機羽根車の平面図である。図2は、斜流送風機羽根車の子午面図である。図3は、斜流送風機羽根車の半径方向断面図である。図4は、アスペクト比b/Lと41dB当たりの風量の関係を示した性能図である。図5は、翼半径方向実長さ、即ちファンスパン方向の翼外周側からの翼面上の凹凸の切り替え点の区切り寸法位置と41dB当たりの発揮風量との関係を示した性能図である。図
6は、斜流送風機羽根車を送風機として用いる場合の模式図である。
(Embodiment 1)
FIG. 1 is a plan view of a mixed flow blower impeller according to the first embodiment of the present invention. FIG. 2 is a meridional view of a mixed flow fan impeller. FIG. 3 is a radial cross-sectional view of the mixed flow fan impeller. FIG. 4 is a performance diagram showing the relationship between the aspect ratio b / L and the air volume per 41 dB. FIG. 5 is a performance diagram showing the relationship between the actual length in the radial direction of the blade, that is, the separation dimension position of the unevenness switching point on the blade surface from the outer peripheral side of the blade in the fan span direction and the amount of air flow per 41 dB. FIG. 6 is a schematic diagram when a mixed flow blower impeller is used as a blower.
図に示すように、斜流送風機羽根車1は略円錐台状のハブ3と、このハブ3に設けた2枚の翼2とを備え、翼2は、翼2の自乗平均半径位置での翼弦長Lと翼の半径方向代表実長さbの比であるアスペクト比b/L≦1.1の範囲に設定し、且つこの範囲のアスペクト比で翼枚数を2枚から構成し、翼2の子午面において前縁4は翼外周側6から2/3位置(一点鎖線A−A)付近を境目として外周側は風上側に対して凹形状の曲線で構成しハブ側3は風上側に対し凸形状の曲線で構成し、かつ翼2の半径方向断面の外周側6から2/3位置を境目として外周側は風上側に対し凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成し、且つ前縁4は螺旋曲線で構成し、且つ翼2の外周側6弦長が前記ハブ側3弦長より長く構成してなるものである。ここで後縁は5であり、翼負圧面が7であり、翼圧力面が8である。図6に示すように、斜流送風機羽根車1をオリフィス10に収納し、ファンモータ9で回転させる事で送風機としての作用を実施できるものである。斜流送風機羽根車1の回転中心をC−Cとして示している。 As shown in the figure, the mixed flow blower impeller 1 includes a substantially truncated cone-shaped hub 3 and two blades 2 provided on the hub 3, and the blade 2 is located at a mean square radius position of the blade 2. The aspect ratio b / L ≦ 1.1, which is the ratio of the chord length L and the representative actual length b in the radial direction of the wing, is set in a range of two, and the number of wings is configured from two with the aspect ratio in this range. In the meridian plane of No. 2, the leading edge 4 is composed of a curve that is concave with respect to the windward side at the 2/3 position (dashed line AA) from the blade outer side 6 and the hub side 3 is on the windward side. The outer peripheral side is composed of a concave curve with respect to the windward side, and the hub side is against the windward side. It is composed of a convex curve, the leading edge 4 is composed of a spiral curve, and the outer string 6 string length of the wing 2 is longer than the hub string 3 string length. Is shall. Here, the trailing edge is 5, the blade suction surface is 7, and the blade pressure surface is 8. As shown in FIG. 6, the mixed flow blower impeller 1 is accommodated in the orifice 10 and rotated by the fan motor 9 so that the function as a blower can be implemented. The rotation center of the mixed flow fan impeller 1 is shown as CC.
これによって、アスペクト比b/L≦1.1からなる2枚翼で構成しているために、適正な翼弦長を保ち最小翼枚数であるので流体仕事を実施する翼面積が最小である為に、流体摩擦が最も少なく送風機としての静圧効率を最も高く設定することができる。 As a result, since the blade is composed of two blades having an aspect ratio of b / L ≦ 1.1, the blade area for performing fluid work is the smallest because the blade has a proper chord length and the minimum number of blades. In addition, the static pressure efficiency as the blower can be set to the highest with the least fluid friction.
かつ翼2の半径方向断面の外周側6から2/3位置付近を境目として外周側は風上側に対し凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成しているので、翼端に発生する洩れ流れを一因として生成する翼端渦を、翼2の半径方向断面の外周側6から2/3位置付近を境目として外周側は風上側に対し凹形状部分で促進させる事ができ、外周側から2/3位置付近までとする寸法が適正であるので、翼端渦生成促進作用にとって最も有効であるので、流体現象として翼端渦の生成促進をする方が無理に抑制して翼端渦のエネルギー発散を抑制する技術よりも却って音響4極子騒音を低減し低騒音化に繋がる技術であり、音響4極子騒音をより効果的に低減でき、最も低騒音化に寄与できる。外周側6から2/3位置付近よりハブ側は風上側に対し凸形状の曲線で構成されるので、翼2の半径方向断面形状で考える時、翼外周6からの半径方向流入を充分に促進できるので静圧を充分に高める事ができる。 In addition, the outer peripheral side is configured with a concave curve with respect to the windward side, and the hub side is configured with a convex curve with respect to the windward side, with the vicinity of 2/3 position from the outer peripheral side 6 of the radial cross section of the blade 2 as a boundary. Therefore, the tip vortex generated due to the leakage flow generated at the tip of the blade is a concave-shaped portion on the outer peripheral side with respect to the windward side at the 2/3 position from the outer peripheral side 6 of the radial cross section of the blade 2. Since the dimensions from the outer peripheral side to the vicinity of the 2/3 position are appropriate, it is most effective for the blade tip vortex generation promoting action. Therefore, it is better to promote the generation of the blade tip vortex as a fluid phenomenon. It is a technology that reduces acoustic quadrupole noise and leads to lower noise than the technology that suppresses the energy divergence of the tip vortex by forcibly suppressing it, and can reduce acoustic quadrupole noise more effectively and achieve the lowest noise. Can contribute. Since the hub side is formed with a convex curve from the vicinity of the 2/3 position from the outer peripheral side 6 to the windward side, when considering the radial cross-sectional shape of the blade 2, the radial inflow from the blade outer periphery 6 is sufficiently accelerated. Since it is possible, the static pressure can be sufficiently increased.
そして、前縁4は螺旋曲線で構成されているので空気を時間をずらせて滑らかに切り進むことが出来るので低騒音であり、翼2の外周側6弦長がハブ側3弦長より長く構成しているので最も翼にかかる空力負荷の高い部分の翼面積投入が適正となるので、アスペクト比b/L≦1.1からなる2枚翼としての構成と相まって送風機としての静圧効率をより高く発揮できる。 Since the leading edge 4 is formed by a spiral curve, the air can be smoothly cut by shifting the time, so that the noise is low, and the outer chord length of the wing 2 is longer than the chord length of the hub side. Therefore, it is appropriate to insert the blade area of the part with the highest aerodynamic load on the blade, so that the static pressure efficiency as a blower can be further improved in combination with the configuration of two blades having an aspect ratio of b / L ≦ 1.1. High performance.
ここで、図4に示したようにアスペクト比b/Lと41dB当たりの風量の関係では、アスペクト比b/L≦1.1の範囲ではФ415の斜流送風機羽根車1をルームエアコン室外機に適用した場合の性能は充分の風量を発揮することが出来るが、アスペクト比b/Lが1.1を超えると41dB当たりの風量が大きく低下するので、アスペクト比b/L≦1.1の範囲に特許上の臨界的意義が存在する。 Here, as shown in FIG. 4, in the relationship between the aspect ratio b / L and the air volume per 41 dB, the mixed flow fan impeller 1 of Ф 415 is used as the room air conditioner outdoor unit in the range of the aspect ratio b / L ≦ 1.1. The performance when applied can exhibit a sufficient air volume, but if the aspect ratio b / L exceeds 1.1, the air volume per 41 dB is greatly reduced, so the range of the aspect ratio b / L ≦ 1.1. Has a critical significance in terms of patents.
さらに、図5に示したように、翼2半径方向実長さ、即ちファンスパン方向の翼外周側6からの翼面上の凹凸の切り替え点の区切り寸法位置と41dB当たりの風量との関係(ルームエアコン室外機でのФ415の斜流送風機羽根車を作動させた状態)を示した性能図であり、Ф415の斜流送風機羽根車1の41dB当たりの発揮風量の推移を開示したものであり、翼外周側6から2/3位置付近の風量は29.5m3/minであり、1/2付近での風量は29.4m3/minであり、翼外周側6から2/3位置付近より更にハブ3側に寄ると41dB当たりの発揮風量は低下していくので、翼面上の凹凸の切り替
え点を翼外周側6から2/3付近と選択することに特許上の臨界的意義を見出す事が出来る。
Further, as shown in FIG. 5, the actual length in the radial direction of the blade 2, that is, the relationship between the separation dimension position of the unevenness switching point on the blade surface from the blade outer peripheral side 6 in the fan span direction and the air volume per 41 dB ( It is a performance diagram showing a state where the mixed flow fan impeller of Ф 415 is operated in the outdoor unit of the room air conditioner, and discloses the transition of the amount of air flow per 41 dB of the mixed flow fan impeller 1 of Ф 415, The air volume in the vicinity of the 2/3 position from the blade outer peripheral side 6 is 29.5 m 3 / min, and the air volume in the vicinity of 1/2 is 29.4 m 3 / min. As the air flow per 41 dB decreases when approaching the 3 side, it is possible to find a critical significance in the patent to select the switching point of the unevenness on the blade surface as 2/3 from the blade outer peripheral side 6 I can do it.
(実施の形態2)
図7は、本発明に実施の形態2に於ける斜流送風機羽根車の平面図を示している。略円錐台状のハブ3と、このハブ3に設けた2枚の翼2とを備え、翼2は、翼2の自乗平均半径位置での翼弦長Lと翼の半径方向代表実長さbの比であるアスペクト比b/L≦1.1の範囲に設定し、かつこの範囲のアスペクト比で翼枚数を2枚から構成し、翼2の子午面において前縁4は翼外周側6から2/3位置付近を境目として外周側は風上側に対して凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成し、かつ翼2の半径方向断面の外周側6から2/3位置を境目として外周側6は風上側に対し凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成し、且つ翼2の外周側6弦長がハブ側3弦長より長く構成し、翼2は、この翼2の前傾直線からなる前縁4と外周の交点に三角形状翼11の一点を合わせ、且つ前縁4に三角形状翼11の一辺を重ねて翼半径を同一となるように三角形状翼11を設けてなる斜流送風機羽根車1を構成してなるものである。
(Embodiment 2)
FIG. 7 shows a plan view of the mixed flow fan impeller according to the second embodiment of the present invention. A substantially frustoconical hub 3 and two blades 2 provided on the hub 3 are provided. The blade 2 has a chord length L at a mean square radial position of the blade 2 and a representative radial length in the radial direction of the blade. The aspect ratio b / L ≦ 1.1, which is the ratio of b, is set to two blades with an aspect ratio within this range, and the leading edge 4 on the meridian surface of the blade 2 is the blade outer peripheral side 6. 2/3 from the boundary, the outer peripheral side is configured with a concave curve with respect to the windward side, the hub side is configured with a convex curve with respect to the windward side, and the outer peripheral side 6 of the radial section of the blade 2 The outer peripheral side 6 is configured with a concave curve with respect to the windward side, and the hub side is configured with a convex curve with respect to the windward side. The wing 2 is configured to be longer than three chord lengths, and the wing 2 matches one point of the triangular wing 11 with the intersection of the front edge 4 and the outer periphery formed of a forward inclined straight line of the wing 2, and Edge 4 is made to constitute a mixed flow blower impeller 1 formed by providing the triangular wings 11 so that the blade radius the same overlapping one side of the triangular blades 11.
これによって、実施の形態1との相違点は、この翼2の前傾直線からなる前縁4と外周の交点に三角形状翼11の一点を重ね、且つ前縁4に三角形状翼11の一辺を密着させて翼半径を同一となるように三角形状翼11を設けてなる斜流送風機羽根車1を提供してなる点である。前縁4が前傾直線で構成されているので、空気を時間をずらせて滑らかに切り進む事が出来るので低騒音である。上記三角上翼11の頂点が翼端渦生成の起点とすることができるので、翼端渦をより明確に生成促進させる作用を有するので、流体現象として翼端渦の生成促進が却って音響4極子騒音を低減し低騒音化を発揮することが出来る。アスペクト比や、翼面上の凹凸形状切り替え位置であるファンスパン方向外周側よりの区切り寸法位置に関する斜流送風機羽根車1の送風機性能に関する記述は実施の形態1に記載した通りである。 As a result, the difference from the first embodiment is that one point of the triangular wing 11 is overlapped at the intersection of the front edge 4 and the outer periphery made of the forward inclined straight line of the wing 2, and one side of the triangular wing 11 is placed on the front edge 4. The mixed flow blower impeller 1 provided with the triangular blades 11 so that the blade radii are the same is provided. Since the front edge 4 is composed of a straight line that is inclined forward, the air can be smoothly cut by shifting the time so that the noise is low. Since the apex of the triangular upper wing 11 can be a starting point for generating the tip vortex, the tip vortex has a function of more clearly promoting the generation of the tip vortex. Noise can be reduced and low noise can be achieved. The description about the fan performance of the mixed-flow fan impeller 1 regarding the aspect ratio and the separation dimension position from the outer peripheral side in the fan span direction which is the position of switching the uneven shape on the blade surface is as described in the first embodiment.
(実施の形態3)
図8は、本発明の実施の形態3の斜流送風機羽根車1の子午面図である。この斜流送風機羽根車1の翼2の後縁5は、子午面において外周側6とハブ3の中点付近(
一点鎖線B−B)より外周側6は直線状で構成し、ハブ側3は風上側に対して凸形状で構成してなる実施の形態1或は実施の形態2に記載の斜流送風機羽根車1を構成してなるものである。
(Embodiment 3)
FIG. 8 is a meridional view of the mixed flow fan impeller 1 according to the third embodiment of the present invention. The trailing edge 5 of the blade 2 of the mixed flow fan impeller 1 is near the midpoint of the outer peripheral side 6 and the hub 3 on the meridian surface (
The outer peripheral side 6 from the alternate long and short dash line BB) is formed in a straight line shape, and the hub side 3 is formed in a convex shape with respect to the windward side. The vehicle 1 is configured.
これによって、翼2の後縁側5ハブ3近傍は、流体仕事に寄与しないので、上記のようにその部分の翼面積を少なくする事は、流体摩擦を減少させて送風機の静圧効率をより高める事ができ、且つ低騒音化にも寄与できるものである。この効果が、実施の形態1や実施の形態2相乗して、その効果を発揮できるものである。具体的には、Ф415の斜流送風機羽根車1をルームエアコン室外機に送風機として用いた時は、約1dBの低騒音化を得ることが出来た。 As a result, the vicinity of the rear edge side 5 hub 3 of the blade 2 does not contribute to the fluid work. Therefore, reducing the blade area of the portion as described above reduces the fluid friction and increases the static pressure efficiency of the blower. Can contribute to noise reduction. This effect can be achieved by synergistic effect with the first embodiment or the second embodiment. Specifically, when the mixed flow blower impeller 1 of the kite 415 was used as a blower for a room air conditioner outdoor unit, a noise reduction of about 1 dB could be obtained.
(実施の形態4)
図には開示していないが、公知のセパレート型ルームエアコン室外機に斜流送風機羽根車1を適用したものである。
(Embodiment 4)
Although not disclosed in the figure, the mixed flow blower impeller 1 is applied to a known separate room air conditioner outdoor unit.
実施の形態4は、実施の形態1から実施の形態3記載のいずれかの一つの発明に記載の斜流送風機羽根車1を有する送風機を、熱交換器や圧縮機などを有するルームエアコン室外機に設けた空気調和機を提供してなるものである。 Embodiment 4 is a room air conditioner outdoor unit having a heat exchanger, a compressor, etc., as a fan having the mixed flow fan impeller 1 described in any one of the inventions described in Embodiments 1 to 3. The air conditioner provided in is provided.
これによって、最も静圧効率の高く低騒音である斜流送風機をルームエアコン室外機に
適用するので、ルームエアコン全体のCOPを向上させることが出来て、且つその作動騒音を低くできるものである。
As a result, the mixed flow blower having the highest static pressure efficiency and low noise is applied to the outdoor unit of the room air conditioner, so that the COP of the entire room air conditioner can be improved and its operating noise can be reduced.
更に図9に示したように、上述したアスペクト比b/L≦1.1の翼枚数が2枚からなる斜流送風機羽根車にかぎらず、翼枚数が3枚からなる斜流送風機羽根車11に実施の形態1から実施の形態3記載の構成技術を用いても同様の効果を発揮することが出来る。ただし、この場合アスペクト比はアスペクト比b/L≦1.1に限定するものではない。更に、此処にはハブ3が円錐状ハブ部分と垂直状はハブ部分の模式形状を開示している。 Further, as shown in FIG. 9, the mixed flow fan impeller 11 having three blades is not limited to the mixed flow fan impeller having two blades having the aspect ratio b / L ≦ 1.1. Even if the configuration techniques described in the first to third embodiments are used, the same effect can be exhibited. However, in this case, the aspect ratio is not limited to the aspect ratio b / L ≦ 1.1. Further, here, the hub 3 discloses a schematic shape of the hub portion when it is perpendicular to the conical hub portion.
以上のように本発明にかかる、空気調和機の斜流送風機羽根車は、アスペクト比b/L≦1.1からなる2枚翼で構成しているために、適正な翼弦長を保ち最小翼枚数であるので流体仕事を実施する翼面積が最小である為に、流体摩擦が最も少なく送風機としての静圧効率を最も高く設定することができる。かつ翼の半径方向断面の外周側から2/3位置付近を境目として外周側は風上側に対し凹形状の曲線で構成しハブ側は風上側に対し凸形状の曲線で構成しているので、翼端に発生する洩れ流れを一因として生成する翼端渦を、翼の半径方向断面の外周側から2/3位置付近を境目として外周側は風上側に対し凹形状部分で促進させる事ができ、外周側から2/3位置付近までとする寸法が適正であるので、翼端渦生成促進作用にとって最も有効であるので、流体現象として翼端渦の生成促進が却って音響4極子騒音を低減し低騒音化に繋がる技術であり、音響4極子騒音をより効果的に低減でき、最も低騒音化に寄与できる。外周側から2/3位置付近よりハブ側は風上側に対し凸形状の曲線で構成されるので、翼の半径方向断面形状で考える時、翼外周からの半径方向流入を充分に促進できるので静圧を充分に高める事ができる。そして、前縁は螺旋曲線で構成されているので空気を時間をずらせて滑らかに切り進むことが出来るので低騒音であり、翼の外周側弦長がハブ側弦長より長く構成しているので最も翼にかかる空力負荷の高い部分の翼面積投入が適正となるので、アスペクト比b/L≦1.1からなる2枚翼としての構成と相まって送風機としての静圧効率をより高く発揮できる。 As described above, the mixed flow blower impeller of the air conditioner according to the present invention is composed of two blades having an aspect ratio of b / L ≦ 1.1. Since the number of blades is the smallest, the blade area for performing fluid work is the smallest, so that the fluid friction is the least and the static pressure efficiency as a blower can be set to the highest. And since the outer peripheral side is configured with a concave curve with respect to the windward side and the hub side is configured with a convex curve with respect to the windward side, with the vicinity of 2/3 position from the outer peripheral side of the radial cross section of the blade as the boundary, It is possible to promote the tip vortex generated due to the leakage flow generated at the tip of the blade with a concave shape part on the outer peripheral side with respect to the windward side at the 2/3 position from the outer peripheral side of the radial cross section of the blade. Since the dimensions from the outer periphery to the 2/3 position are appropriate, it is the most effective for the blade tip vortex generation promoting action, so the generation of the blade tip vortex is promoted as a fluid phenomenon, reducing acoustic quadrupole noise. This is a technology that leads to a reduction in noise, can effectively reduce acoustic quadrupole noise, and can contribute most to the reduction in noise. Since the hub side is formed with a convex curve from the vicinity of the 2/3 position from the outer peripheral side, the radial inflow from the outer periphery of the blade can be sufficiently promoted when considering the radial sectional shape of the blade. The pressure can be increased sufficiently. And since the leading edge is composed of a spiral curve, the air can be smoothly cut by shifting the time, so the noise is low and the wing outer chord length is longer than the hub chord length. Since it is appropriate to insert the blade area of the portion with the highest aerodynamic load on the blade, the static pressure efficiency as a blower can be further enhanced in combination with the configuration of two blades having an aspect ratio of b / L ≦ 1.1.
更に、この斜流送風機羽根車は、ファンを用いる工業製品である産業用機器に展開する事は可能である。即ち、換気扇、扇風機、コンピュ−タ冷却ファンなどに用いることは可能である。 Furthermore, this mixed flow fan impeller can be deployed in industrial equipment that is an industrial product using a fan. That is, it can be used for ventilation fans, electric fans, computer cooling fans, and the like.
1 斜流送風機羽根車
2 翼
3 ハブ
4 前縁
5 後援
6 外周
7 負圧面
8 圧力面
9 ファンモータ
10 オリフィス
11 3枚からなる斜流送風機羽根車
DESCRIPTION OF SYMBOLS 1 Mixed flow fan impeller 2 Wing | blade 3 Hub 4 Front edge 5 Support 6 Outer periphery 7 Negative pressure surface 8 Pressure surface 9 Fan motor 10 Orifice 11 Mixed flow fan impeller which consists of 3 sheets
Claims (4)
The air conditioner which provided the air blower which has the mixed flow fan impeller of any one of Claim 1 to 3 in the room air-conditioner outdoor unit which has a heat exchanger, a compressor, etc.
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JP2007190328A JP4967883B2 (en) | 2007-07-23 | 2007-07-23 | Mixed flow blower impeller and air conditioner |
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CN105473853A (en) * | 2013-10-01 | 2016-04-06 | 夏普株式会社 | Propeller fan and blower |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000329098A (en) * | 1999-05-17 | 2000-11-28 | Matsushita Electric Ind Co Ltd | Mixed flow air blower |
JP2001090693A (en) * | 1999-09-24 | 2001-04-03 | Matsushita Electric Ind Co Ltd | Blower impeller and air conditioner |
JP3204208B2 (en) * | 1998-04-14 | 2001-09-04 | 松下電器産業株式会社 | Mixed-flow blower impeller |
JP2006291735A (en) * | 2005-04-06 | 2006-10-26 | Matsushita Electric Ind Co Ltd | Blower impeller |
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2007
- 2007-07-23 JP JP2007190328A patent/JP4967883B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3204208B2 (en) * | 1998-04-14 | 2001-09-04 | 松下電器産業株式会社 | Mixed-flow blower impeller |
JP2000329098A (en) * | 1999-05-17 | 2000-11-28 | Matsushita Electric Ind Co Ltd | Mixed flow air blower |
JP2001090693A (en) * | 1999-09-24 | 2001-04-03 | Matsushita Electric Ind Co Ltd | Blower impeller and air conditioner |
JP2006291735A (en) * | 2005-04-06 | 2006-10-26 | Matsushita Electric Ind Co Ltd | Blower impeller |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105473853A (en) * | 2013-10-01 | 2016-04-06 | 夏普株式会社 | Propeller fan and blower |
CN105473853B (en) * | 2013-10-01 | 2017-07-07 | 夏普株式会社 | Propeller type fan and air-supply arrangement |
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