JP2009127541A - Centrifugal fan - Google Patents

Centrifugal fan Download PDF

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JP2009127541A
JP2009127541A JP2007303999A JP2007303999A JP2009127541A JP 2009127541 A JP2009127541 A JP 2009127541A JP 2007303999 A JP2007303999 A JP 2007303999A JP 2007303999 A JP2007303999 A JP 2007303999A JP 2009127541 A JP2009127541 A JP 2009127541A
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main plate
centrifugal fan
blades
horseshoe
blade
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Toru Iwata
透 岩田
Shimei Tei
志明 鄭
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Daikin Industries Ltd
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Daikin Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal fan showing excellent blade performances as soon as possible by effectively inhibiting horse-shoe swirl. <P>SOLUTION: This centrifugal fan comprises: a round main plate 14 rotationally driven by a motor rotary shaft; a plurality of blades 16 fixed on an outer circumference part of the main plate 14 at one end side thereof with keeping predetermined intervals in a circumferential direction; and an arc shape cross section side plate 15 inclined from a center side air suction port to an outer circumference side centrifugal direction at predetermined curvature. The plurality of blades 16 are provided with hose-shoe swirl inhibition part R1 respectively. Since hose-shoe swirl is inhibited by the hose-shoe swirl inhibition part R1 and the hose-shoe swirl is not easily formed or is small even if it is formed, effect on main flow passing through the blades 16 gets small and blasting performance is improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本願発明は、遠心ファンの構造に関するものである。   The present invention relates to the structure of a centrifugal fan.

ターボファン等の遠心ファンは、主板および側板（シュラウド）の間に多数枚の羽根を備えて構成されている（例えば特許文献１参照）。   A centrifugal fan such as a turbofan is configured to include a large number of blades between a main plate and a side plate (shroud) (see, for example, Patent Document 1).

今、同ターボファンの具体的な構成を図９〜図１２に示す。この例では、一例として同ターボファンが天井埋込型空気調和機用室内機に適用されたものとして示されている。   A specific configuration of the turbofan is shown in FIGS. In this example, the turbo fan is shown as an example applied to a ceiling-embedded indoor unit for an air conditioner.

図９〜図１２中、先ず符号２は、例えば天井埋込型空気調和機用室内機１のカセット型の本体ケーシングである。該本体ケーシング２は、その吸気・吹出パネル（下面パネル部）４が天井３と略同一平面状に連続するようにして、天井３内に埋設されている。   9 to 12, reference numeral 2 denotes a cassette-type main body casing of the indoor unit 1 for a ceiling-embedded air conditioner, for example. The main body casing 2 is embedded in the ceiling 3 such that its intake / blowout panel (lower surface panel portion) 4 continues in substantially the same plane as the ceiling 3.

そして、上記本体ケーシング２の上記吸気・吹出パネル４には、中央部に方形の空気吸込グリル５が設けられ、さらに、その内側にターボファン１１用のベルマウス６が連設されている。また、上記本体ケーシング２の吸気・吹出パネル４の上記空気吸込グリル５の外周部４方には、所定の幅の空気吹出口９，９・・が設けられている。   The intake / blowout panel 4 of the main body casing 2 is provided with a square air suction grille 5 at the center, and further, a bell mouth 6 for the turbofan 11 is continuously provided inside thereof. Further, air blowout ports 9, 9... Having a predetermined width are provided on the outer peripheral portion 4 side of the air suction grille 5 of the intake / blowout panel 4 of the main body casing 2.

そして、上記本体ケーシング２内には上記空気吸込グリル５からベルマウス６を経て上記空気吹出口９，９・・方向に到る全周方向の通風路１０が形成されており、該通風路１０の上記ベルマウス６の背後（図示上部）中央に位置して、その空気吸込側（後述する側板１５側）が上記ベルマウス６に対応するターボファン１１が、ファンモータ１３を介して上記本体ケーシング２の天井パネル２ａに吊設されている。   In the main body casing 2, a ventilation passage 10 is formed in the circumferential direction from the air suction grille 5 through the bell mouth 6 to the air outlets 9, 9. The turbofan 11 is located in the center of the back of the bell mouth 6 (upper part in the figure) and the air suction side (side plate 15 side described later) corresponds to the bell mouth 6 is connected to the main casing through the fan motor 13. 2 suspended from the ceiling panel 2a.

さらに、同通風路１０には、該ターボファン１１を囲む状態で空気熱交換器１２が設けられている。   Further, an air heat exchanger 12 is provided in the ventilation path 10 so as to surround the turbofan 11.

一方、該ターボファン１１は、上記ファンモータ１３の回転駆動軸１３ａに固定された円形のハブ（主板）１４と羽根車内遠心方向への空気吸込口を形成する他端側異径筒状の側板（シュラウド）１５との間に多数枚の羽根（動翼羽根）１６，１６・・・を所定の翼角、所定の翼間隔で周方向に並設して構成されている。他方、その側板１５の空気吸込側端部１５ａ内には、上記ベルマウス６の下流側空気流出口側端部６ｃが所定の隙間を保って相対回転可能に所定寸法遊嵌されている。   On the other hand, the turbo fan 11 includes a circular hub (main plate) 14 fixed to the rotational drive shaft 13a of the fan motor 13 and a cylindrical side plate on the other end side that forms an air suction port in the centrifugal direction in the impeller. A plurality of blades (moving blade blades) 16, 16... Are arranged in parallel in the circumferential direction with a predetermined blade angle and a predetermined blade interval. On the other hand, in the air suction side end portion 15a of the side plate 15, the downstream air outlet side end portion 6c of the bell mouth 6 is loosely fitted with a predetermined dimension so as to be relatively rotatable with a predetermined gap.

上記ベルマウス６は、上記ターボファン羽根車の空気吸込口を形成している側板１５の空気吸込側端部１５ａに対して上記本体ケーシング２側空気吸込グリル５からの空気を羽根車内遠心方向にスムーズに流入させるために、図示のように吸気・吹出パネル４への取付縁部６ａから内方に延び、その空気流上流側から空気流下流側にかけて次第に開口径が縮小した所定曲率半径の空気流入口部６ｂと空気流出口部６ｃとからなる気流ガイド面を有して構成されている。そして、その形状により上記ターボファン羽根車のシュラウド１５に対応して、上記ターボファン羽根車の吸込側の空気を当該吸込側において吹出側遠心方向にスムーズにガイドすることによって送風時に生じる空力騒音を可能な限り低減する。   The bell mouth 6 causes the air from the main body casing 2 side air suction grille 5 in the impeller centrifugal direction to the air suction side end 15a of the side plate 15 forming the air suction port of the turbofan impeller. In order to smoothly flow in, air having a predetermined curvature radius that extends inwardly from the mounting edge 6a to the intake / blowout panel 4 as shown in the figure and whose opening diameter gradually decreases from the upstream side to the downstream side of the air flow. It has an air flow guide surface composed of an inflow port portion 6b and an air outflow port portion 6c. And the aerodynamic noise generated at the time of ventilation by smoothly guiding the air on the suction side of the turbofan impeller in the blowout side centrifugal direction on the suction side corresponding to the shroud 15 of the turbofan impeller due to its shape. Reduce as much as possible.

以上のようにターボファン等の遠心送風機では、各々ベルマウス６および側板１５の気流ガイド面の形状を相互に理想的な気流ガイド面形状に近づけることによって、羽根車外周部や吸込部の気流の乱れを少なくして空力騒音の低減を図るようにしている。   As described above, in a centrifugal fan such as a turbofan, the shape of the airflow guide surfaces of the bell mouth 6 and the side plate 15 is made close to the ideal airflow guide surface shape, thereby reducing the airflow at the outer periphery of the impeller and the suction portion. The disturbance is reduced and aerodynamic noise is reduced.

また、その他の送風性能を向上させる構成として、例えば上記羽根１６，１６・・・の側板１５と対応していない前縁部１５ａの側板１５側端部のみを羽根１６，１６・・・の回転方向に傾斜させることによって、羽根１６，１６・・・の入口部における負圧面側の剥離を防止するようにしたものがある（例えば特許文献２参照）。   Further, as another configuration for improving the blowing performance, for example, only the side plate 15 side end portion of the front edge portion 15a not corresponding to the side plate 15 of the blades 16, 16,. There is one that prevents the suction surface side from peeling off at the inlet portion of the blades 16, 16... By inclining in the direction (see, for example, Patent Document 2).

特開２００１−１１５９９１号公報JP 2001-115991 A 特開平１０−１９６５９１号公報JP-A-10-196591

ところが、上述のように平面形状の主板１４に羽根１６が垂直に設けられている場合、例えば図１３〜図１５に示すように、主板１４と羽根１６の前縁１６ａとが交差する位置を中心として馬蹄形の渦が生成される。そして、この渦の生成、増大により、羽根１６を通る主流が妨げられて（乱されて）羽根１６の性能が低下する問題があった。   However, when the blades 16 are vertically provided on the planar main plate 14 as described above, for example, as shown in FIGS. 13 to 15, the position where the main plate 14 and the front edge 16 a of the blade 16 intersect is the center. As a horseshoe vortex is generated. Then, due to the generation and increase of the vortex, there is a problem that the main flow through the blade 16 is hindered (disturbed) and the performance of the blade 16 is deteriorated.

他方、上記その他の従来例のように羽根１６の側板１５に対応していない前縁部１６ａのみを回転方向に傾斜させたとしても、やはりこのような馬蹄形渦により主流が乱される問題を解決することはできない。   On the other hand, even if only the front edge portion 16a that does not correspond to the side plate 15 of the blade 16 is inclined in the rotational direction as in the other conventional examples, the problem that the mainstream is disturbed by such a horseshoe vortex is solved. I can't do it.

本願発明は、このような問題を解決するためになされたもので、羽根の主板との接続側部分で、羽根前縁を内外何れかの方向に曲成し、羽根前縁の形状を左右で非対称にする等の馬蹄形渦抑制構造を設けることによって馬蹄形渦を有効に抑制し、可及的に良好な羽根性能を発揮させるようにした遠心ファンを提供することを目的とするものである。   The present invention has been made to solve such a problem, and at the connection side portion with the main plate of the blade, the blade leading edge is bent in either the inside or outside direction, and the shape of the blade leading edge is changed to the left and right. An object of the present invention is to provide a centrifugal fan in which a horseshoe vortex is effectively suppressed by providing a horseshoe vortex suppressing structure such as an asymmetric structure so that the blade performance is as good as possible.

本願発明は、上記の目的を達成するために、次のような有効な課題解決手段を備えて構成されている。   In order to achieve the above object, the present invention comprises the following effective problem solving means.

（１） 請求項１の発明
この発明は、モータ回転軸により回転駆動される円形の主板と、この主板の外周部に周方向に所定の間隔をおいて一端側を固定された複数枚の羽根と、これら複数枚の羽根の上記主板と反対側の端部に取り付けられた中央側空気吸込口から外周側遠心方向へ所定の曲率で傾斜する断面円弧形状の側板とを備えてなる遠心ファンであって、上記複数枚の羽根には、それぞれ馬蹄形渦抑制部が設けられていることを特徴としている。 (1) The invention of claim 1 The present invention relates to a circular main plate that is rotationally driven by a motor rotating shaft, and a plurality of blades having one end fixed to the outer peripheral portion of the main plate at a predetermined interval in the circumferential direction. And a centrifugal fan comprising a side plate having a circular arc cross section inclined at a predetermined curvature from the central air suction port attached to the end opposite to the main plate of the plurality of blades to the outer peripheral side centrifugal direction. In addition, each of the plurality of blades is provided with a horseshoe vortex suppressing portion.

このような構成では、主板との接続部における羽根前縁の形状が左右で非対称になることから、上述の馬蹄形渦が生成しにくくなる、或いは生成されても小さくなるので、羽根を通る主流への影響が小さくなり、有効に送風性能が改善される。   In such a configuration, since the shape of the leading edge of the blade at the connection with the main plate is asymmetrical on the left and right, the above-described horseshoe vortex is less likely to be generated, or even if generated, the mainstream passing through the blade. The air flow performance is effectively improved.

（２） 請求項２の発明
この発明は、上記請求項１の発明の構成において、馬蹄形渦抑制部は、主板側前縁近傍の回転方向への湾曲構造よりなることを特徴としている。 (2) Invention of Claim 2 This invention is characterized in that, in the configuration of the invention of Claim 1 above, the horseshoe-shaped vortex suppressing portion has a curved structure in the rotational direction in the vicinity of the front edge on the main plate side.

このような構成では、同回転方向への湾曲構造により、主板との接続部における羽根前縁の形状が左右で非対称になることから、上述の馬蹄形渦が生成しにくくなる、或いは生成されても小さくなるので、羽根を通る主流への影響が小さくなり、有効に送風性能が改善される。   In such a configuration, the shape of the blade leading edge at the connecting portion with the main plate is asymmetrical on the left and right due to the curved structure in the same rotation direction, so that the above horseshoe vortex is difficult to be generated or generated. Since it becomes small, the influence on the mainstream which passes a blade | wing becomes small, and ventilation performance is improved effectively.

（３） 請求項３の発明
この発明は、上記請求項１の発明の構成において、馬蹄形渦抑制部は、主板側前縁近傍の反回転方向への湾曲構造よりなることを特徴としている。 (3) Invention of Claim 3 This invention is characterized in that, in the configuration of the invention of Claim 1, the horseshoe-shaped vortex suppressing portion has a curved structure in the counter-rotating direction in the vicinity of the front edge on the main plate side.

このような構成では、同反回転方向への湾曲構造により、主板との接続部における羽根前縁の形状が左右で非対称になることから、上述の馬蹄形渦が生成しにくくなる、或いは生成されても小さくなるので、羽根を通る主流への影響が小さくなり、有効に送風性能が改善される。   In such a configuration, the shape of the blade leading edge at the connecting portion with the main plate becomes asymmetrical on the left and right due to the curved structure in the opposite rotation direction, so that the above horseshoe vortex is difficult to be generated or generated. Therefore, the influence on the main flow passing through the blades is reduced, and the air blowing performance is effectively improved.

（４） 請求項４の発明
この発明は、上記請求項２又は３の発明の構成において、馬蹄形渦抑制部は、前縁の主板側が部分的に前進する前進翼構造よりなることを特徴としている。 (4) Invention of Claim 4 This invention is characterized in that, in the configuration of the invention of Claim 2 or 3, the horseshoe-shaped vortex suppressing portion has a forward wing structure in which the main plate side of the leading edge is partially advanced. .

このような構成では、羽根前縁部において、吸込気流の主流側から主板側方向に押圧力が作用するようになることから、上記請求項２又は３の発明の湾曲構成による作用と相乗して、より上述の馬蹄形渦が生成しにくくなる、或いは生成されてもより小さくなるので、羽根を通る主流への影響がより小さくなり、より有効に送風性能が改善される。   In such a configuration, a pressing force acts on the leading edge of the blade from the mainstream side of the suction airflow toward the main plate side. Therefore, in synergy with the operation of the curved configuration of the invention of claim 2 or 3 above. Since the above-mentioned horseshoe vortex is less likely to be generated or is smaller even if it is generated, the influence on the mainstream passing through the blades is further reduced, and the air blowing performance is more effectively improved.

（５） 請求項５の発明
この発明は、上記請求項１，２又は３の発明の構成において、馬蹄形渦抑制部は、前縁の主板側が部分的に後退する後退翼構造よりなることを特徴としている。 (5) Invention of Claim 5 This invention is the configuration of the invention of Claim 1, 2 or 3, wherein the horseshoe-shaped vortex suppressing part is composed of a receding wing structure in which the main plate side of the leading edge is partially retracted. It is said.

このような構成では、羽根前縁部において、吸込後遠心方向に増速された主流側から主板側方向に押圧力が作用するようになることから、上述の馬蹄形渦が生成しにくくなる、或いは生成されても小さくなるので、羽根を通る主流への影響が小さくなり、有効に送風性能が改善される。   In such a configuration, since the pressing force acts in the main plate side direction from the main flow side accelerated in the centrifugal direction after suction at the blade leading edge portion, the above-described horseshoe vortex is hardly generated, or Even if it is generated, it becomes smaller, so the influence on the main flow through the blades is reduced, and the air blowing performance is effectively improved.

以上の結果、本願発明によれば、空力騒音が低く、送風性能の高い空気調和機用室内機の送風機に適した遠心ファンを低コストに提供することができるようになる。   As a result, according to the present invention, it is possible to provide a centrifugal fan suitable for a blower of an indoor unit for an air conditioner with low aerodynamic noise and high blower performance at low cost.

（最良の実施の形態１）
図１〜図５は、例えば前述のような天井埋込型空気調和機用室内機の送風機に適用するのに最適な本願発明の最良の実施の形態１に係る遠心ファン（ターボファン）の構造を示している。 (Best Embodiment 1)
1 to 5 show, for example, the structure of a centrifugal fan (turbo fan) according to the best embodiment 1 of the present invention that is optimal for application to a blower of an indoor unit for a ceiling-embedded air conditioner as described above. Is shown.

この遠心ファン（ターボファン）１１は、例えば図１，図２（および図９）に示すように、前述のファンモータ１３の回転駆動軸１３ａに固定された円形のハブ（主板）１４と羽根車内遠心方向への空気吸込口を形成する他端側異径筒状の側板（シュラウド）１５との間に多数枚の羽根（動翼羽根）１６，１６・・・を所定の翼角、所定の翼間隔で周方向に並設して構成されている。他方、その側板１５の空気吸込側端部１５ａ内には、上記ベルマウス６の下流側空気流出口部６ｃが所定の隙間を保って相対回転可能に所定寸法遊嵌されるようになっている。   The centrifugal fan (turbo fan) 11 includes, for example, a circular hub (main plate) 14 fixed to the rotary drive shaft 13a of the fan motor 13 and an impeller as shown in FIGS. 1 and 2 (and FIG. 9). A large number of blades (moving blade blades) 16, 16,... Between the other end side different diameter cylindrical side plate (shroud) 15 that forms an air suction port in the centrifugal direction are provided with a predetermined blade angle and a predetermined blade angle. It is arranged side by side in the circumferential direction with blade spacing. On the other hand, in the air suction side end portion 15a of the side plate 15, the downstream air outlet portion 6c of the bell mouth 6 is loosely fitted with a predetermined dimension so as to be relatively rotatable with a predetermined gap. .

またベルマウス６は、ファン羽根車の空気吸込口を形成している側板１５の空気吸込側端部１５ａに対して上記本体ケーシング２側空気吸込グリル５からの空気を羽根車内遠心方向にスムーズに流入させるために、吸気・吹出パネル４への取付縁部６ａから内方に延び、その空気流上流側から空気流下流側にかけて次第に開口径が縮小した所定曲率半径の空気流入口部６ｂと空気流出口部６ｃとからなる気流ガイド面を有して構成されている。   The bell mouth 6 smoothly draws air from the main body casing 2 side air suction grille 5 in the impeller centrifugal direction with respect to the air suction side end 15a of the side plate 15 forming the air suction port of the fan impeller. For inflow, an air inlet 6b having a predetermined radius of curvature and an air extending from an attachment edge 6a to the intake / blowout panel 4 and having an opening diameter gradually reduced from the air flow upstream side to the air flow downstream side. It has an airflow guide surface composed of the outlet portion 6c.

そして、その形状により上記ファン羽根車の側板１５に対応して、上記ファン羽根車の吸込側の空気を当該吸込側において吹出側遠心方向にスムーズにガイドする。   Then, by the shape, the air on the suction side of the fan impeller is smoothly guided in the blow-out side centrifugal direction on the suction side corresponding to the side plate 15 of the fan impeller.

以上のようにターボファン等の遠心ファンでは、各々ベルマウス６および側板１５の気流ガイド面の形状を相互に理想的な気流ガイド面形状に近づけることによって、羽根車外周部や吸込部の気流の乱れを少なくして可及的に空力騒音の低減を図るとともに送風性能を向上させるようにしている。   As described above, in the centrifugal fan such as the turbo fan, the airflow guide surfaces of the bell mouth 6 and the side plate 15 are made close to the ideal airflow guide surface shape, respectively. The disturbance is reduced to reduce the aerodynamic noise as much as possible, and the air blowing performance is improved.

ところが、このように平面形状の主板１４に羽根１６，１６・・・が垂直に設けられている場合、例えば図１３〜図１５に示すように、主板１４と羽根１６の前縁１６ａとの交差する位置を中心として馬蹄形の渦が形成される。そして、この馬蹄形の渦の生成、増大により羽根１６を通る本来の主流が妨げられて羽根１６の性能が低下する問題があった。   However, when the blades 16, 16... Are provided vertically on the planar main plate 14 as described above, for example, as shown in FIGS. 13 to 15, the intersection of the main plate 14 and the leading edge 16 a of the blade 16. A horseshoe-shaped vortex is formed around the position where Then, the generation and increase of the horseshoe-shaped vortex hinders the main main flow through the blades 16 and the performance of the blades 16 deteriorates.

本実施の形態では、このような問題を解決するために、例えば図３および図４に示す如く、羽根１６の前縁１６ａと主板１４が接続される主板１４側部分で、羽根１６の前縁１６ａ部分を、例えば図３中の破線で示す部分を基準として内側回転方向に倒すことによって、主板１４側の前縁１６ａ近傍に反回転方向へ突出した湾曲凸面部Ｒ1を形成し、羽根１６の前縁１６ａの主板１４との接続部の形状を左右両側（正圧面側および負圧面側）で非対称にすることにより、上述の馬蹄形渦の生成を抑制し、可及的に良好な羽根性能を発揮させるようにしている。 In the present embodiment, in order to solve such a problem, for example, as shown in FIGS. 3 and 4, the front edge of the blade 16 is formed at the main plate 14 side portion where the front edge 16 a of the blade 16 and the main plate 14 are connected. For example, a curved convex surface portion R 1 projecting in the counter-rotating direction is formed in the vicinity of the front edge 16a on the main plate 14 side by tilting the portion 16a in the inner rotation direction with reference to a portion indicated by a broken line in FIG. By making the shape of the connecting portion of the leading edge 16a of the front edge 16a to the main plate 14 asymmetric on both the left and right sides (pressure side and suction side), the generation of the above horseshoe vortex is suppressed and the blade performance is as good as possible To try to demonstrate.

このように、主板１４側の前縁１６ａを回転方向に倒し、同前縁１６ａ部分に反回転側方向へ突出した湾曲凸面部Ｒ1を形成し、羽根１６の前縁１６ａの主板１４部分の形状を左右で非対称にすると、同湾曲凸面部Ｒ1が馬蹄形渦抑制部となり、例えば図５中に矢印で示すように、羽根１６の内側（負圧面側）では、遠心力により主板側に力が働き、馬蹄形渦の発達が抑制される。その結果、それに対応して相関関係にある羽根１６，１６・・・の外側（正圧面側）の相対的に小さい馬蹄形がさらに小さくなり、羽根１６を通る主流への影響も小さくなって、有効に送風性能が改善される。 In this way, the front edge 16a on the main plate 14 side is tilted in the rotational direction, the curved convex surface portion R 1 protruding in the counter-rotation side direction is formed on the front edge 16a portion, and the main plate 14 portion of the front edge 16a of the blade 16 is formed. When the shape is asymmetric left and right, the curved convex surface R 1 becomes a horseshoe-shaped vortex suppressing portion. For example, as indicated by an arrow in FIG. 5, a force is applied to the main plate side by centrifugal force inside the blade 16 (at the suction surface side). Works to suppress the development of horseshoe vortices. As a result, the relatively small horseshoe shape on the outer side (pressure surface side) of the blades 16, 16... Correlating correspondingly is further reduced, and the influence on the mainstream passing through the blades 16 is reduced. The air blowing performance is improved.

（変形例）
なお、上述の湾曲凸面部Ｒ1よりなる馬蹄形渦抑制部は、例えば図６に示すように、上述とは逆に羽根１６の主板１４側前縁１６ａ近傍の内側回転方向への湾曲凸面部構造しとてもよい。 (Modification)
The horseshoe-shaped vortex suppressing portion composed of the above-described curved convex surface portion R 1 is, for example, as shown in FIG. 6, a curved convex surface portion structure in the inner rotation direction in the vicinity of the front edge 16a on the main plate 14 side of the blade 16 contrary to the above. Very good.

このような構成によると、羽根１６，１６・・・の外側（正圧面側）には、ファンの回転に伴うコリオリ力の影響により、同部分における主流の流れが向上し、同部分における馬蹄形渦の発生を一層有効に抑制することができる。   According to such a configuration, on the outer side (pressure surface side) of the blades 16, 16..., The mainstream flow in the same part is improved by the influence of the Coriolis force accompanying the rotation of the fan, and the horseshoe vortex in the same part. Can be more effectively suppressed.

その結果、それに対応して他方側羽根１６，１６・・・の内側（負圧面側）の馬蹄形渦も有効に抑制されるので、羽根１６，１６・・・を通る主流への影響も小さくなって、より有効に送風性能が改善される。   As a result, the horseshoe-shaped vortex inside (negative pressure surface side) of the other side blades 16, 16... Is effectively suppressed accordingly, and the influence on the mainstream passing through the blades 16, 16. Thus, the air blowing performance is improved more effectively.

（最良の実施の形態２）
図７は、同じく前述のような天井埋込型空気調和機用室内機の送風機に適した本願発明の最良の実施の形態２に係る遠心ファンの要部の構造を示している。 (Best Mode 2)
FIG. 7 shows the structure of the main part of the centrifugal fan according to the second preferred embodiment of the present invention, which is also suitable for the blower of the indoor unit for ceiling-embedded air conditioner as described above.

この実施の形態では、例えば図７に示すように、上述した馬蹄形渦抑制部が、例えば羽根１６の前縁１６ａの主板１４側部分が所定寸法主板１４の中心側へ前進する部分的な前進翼構造部Ｒ2よりなるとともに、同前進方向への突出部を上述の最良の実施の形態１およびその変形例の構成のように、羽根１６の回転方向又は反回転方向に倒して湾曲させたことを特徴としている。 In this embodiment, for example, as shown in FIG. 7, the horseshoe vortex suppressing portion described above is a partial forward wing in which the main plate 14 side portion of the front edge 16 a of the blade 16 advances to the center side of the predetermined size main plate 14, for example. Consisting of the structure portion R 2 , the projecting portion in the forward direction is bent in the rotational direction or the counter-rotating direction of the blade 16 as in the configuration of the above-described best embodiment 1 and its modified example. It is characterized by.

このような構成では、先ず羽根１６の前縁１６ａの主板１４との接続部部分に対して、当該羽根１６，１６・・・の両面側において、図７の仮想線矢印で示す吸込気流（主流）による押圧力が作用するようになることから、やはり上述の馬蹄形渦が生成しにくくなるか、或いは生成されても十分に小さくなる。その結果、羽根１６を通る主流への影響が小さくなり、有効に送風性能が改善される。   In such a configuration, first, the suction airflow (mainstream) indicated by the phantom line arrow in FIG. 7 is formed on both sides of the blades 16, 16... ), The horseshoe vortex described above becomes difficult to generate or is sufficiently small even if generated. As a result, the influence on the mainstream passing through the blades 16 is reduced, and the air blowing performance is effectively improved.

しかも、それに加えて上述の実施の形態１およびその変形例の構成による作用が加わる。   In addition to that, the operation of the configuration of the first embodiment and its modification is added.

すなわち、以上のように、羽根１６の前縁１６ａの主板１４側部分を部分的に前進翼構造に突出させると同時に、さらに同突出部を上述の最良の実施の形態１およびその変形例の構成のように、羽根１６の回転方向又は反回転方向に倒して湾曲させると、それら２つの構成による馬蹄形渦抑制作用が相乗して、より一層効果的に馬蹄形渦が縮小される。   That is, as described above, the main plate 14 side portion of the leading edge 16a of the blade 16 is partially protruded into the forward blade structure, and at the same time, the protruding portion is further configured as in the above-described first embodiment and its modification. As described above, when the blade 16 is tilted in the rotational direction or the counter-rotating direction and curved, the horseshoe vortex suppressing action by the two configurations is synergistic, and the horseshoe vortex is more effectively reduced.

（最良の実施の形態３）
図８は、同じく前述のような天井埋込型空気調和機用室内機の送風機に適した本願発明の最良の実施の形態３に係る遠心ファンの要部の構造を示している。 (Best Mode 3)
FIG. 8 shows the structure of the main part of the centrifugal fan according to the third embodiment of the present invention suitable for the blower of the indoor unit for ceiling-embedded air conditioner as described above.

この実施の形態では、例えば図８に示すように上述した馬蹄形渦抑制部が、羽根１６の前縁１６ａの主板１４側部分が部分的に後退する後退翼構造部Ｒ3よりなることを特徴としている。 In this embodiment, for example, as shown in FIG. 8, the horseshoe-shaped vortex suppressing portion described above is composed of a receding wing structure portion R 3 in which the main plate 14 side portion of the front edge 16 a of the blade 16 is partially retracted. Yes.

このような構成では、羽根１６の前縁１６ａの主板１４との接続部部分に対して、当該羽根１６の前縁において、主板側へ流れが発生するような圧力勾配が生じることから、やはり上述の馬蹄形渦が生成しにくくなるか、或いは生成されても十分に小さくなる。その結果、羽根１６を通る主流への影響が小さくなり、有効に送風性能が改善される。   In such a configuration, a pressure gradient is generated at the front edge of the blade 16 at the front edge 16a of the blade 16 so as to generate a flow toward the main plate. The horseshoe-shaped vortex becomes difficult to generate or is sufficiently small even if generated. As a result, the influence on the mainstream passing through the blades 16 is reduced, and the air blowing performance is effectively improved.

（変形例）
なお、以上のように羽根１６の前縁１６ａの主板１４側部分を部分的に後退翼構造に変形させると同時に、さらに同変形部を上述の最良の実施の形態１およびその変形例の構成のように、羽根１６の回転方向又は反回転方向に倒して湾曲させることも可能である。 (Modification)
As described above, the main plate 14 side portion of the leading edge 16a of the blade 16 is partially deformed into a swept wing structure, and at the same time, the same deformed portion is configured as in the above-described best embodiment 1 and its modified example. As described above, the blade 16 can be bent in the rotational direction or the counter-rotating direction.

このようにすると、それら２つの構成による馬蹄形渦抑制作用が相乗して、より一層効果的に馬蹄形渦が縮小される。   If it does in this way, the horseshoe vortex suppression action by these two composition will synergize, and a horseshoe vortex will be reduced more effectively.

天井埋込型空気調和機用室内機の送風機に適した本願発明の最良の実施の形態１に係る遠心ファンの構成を示す全体構造の断面図である。It is sectional drawing of the whole structure which shows the structure of the centrifugal fan which concerns on the best Embodiment 1 of this invention suitable for the air blower of the indoor unit for ceiling embedded type air conditioners. 同遠心ファンの側板側から見た要部の構成を示す平面図である。It is a top view which shows the structure of the principal part seen from the side-plate side of the centrifugal fan. 同遠心ファンの側板および主板間の羽根の構成を示す断面図である。It is sectional drawing which shows the structure of the blade | wing between the side plate and main plate of the centrifugal fan. 同遠心ファンの図２のＡ−Ａ線位置（羽根前縁位置）での切断部における羽根湾曲部および主板と側板との接続関係を示す断面図である。It is sectional drawing which shows the connection relation of the blade | wing curved part in the cutting | disconnection part in the AA line position (blade leading edge position) of FIG. 2 of the centrifugal fan, and a main plate and a side plate. 同遠心ファンの図２のＡ−Ａ線位置（羽根前縁位置）での切断部における羽根湾曲部の湾曲の仕方と主板との接続関係およびその作用を示す要部の拡大断面図である。It is an expanded sectional view of the principal part which shows the connection relation of the bending method of the blade | wing curved part in the cutting part in the AA line position (blade leading edge position) of FIG. 同遠心ファンの羽根の湾曲方向を逆にした変形例の構造を示す断面図である。It is sectional drawing which shows the structure of the modification which reversed the bending direction of the blade | wing of the centrifugal fan. 天井埋込型空気調和機用室内機の送風機に適した本願発明の最良の実施の形態２に係る遠心ファンの構成を示す要部の構造の断面図である。It is sectional drawing of the structure of the principal part which shows the structure of the centrifugal fan which concerns on the best Embodiment 2 of this invention suitable for the air blower of the indoor unit for ceiling embedded type air conditioners. 天井埋込型空気調和機用室内機の送風機に適した本願発明の最良の実施の形態３に係る遠心ファンの構成を示す全体構造の断面図である。It is sectional drawing of the whole structure which shows the structure of the centrifugal fan which concerns on the best Embodiment 3 of this invention suitable for the air blower of the indoor unit for ceiling embedded type air conditioners. 天井埋込型空気調和機用室内機に適用した従来の遠心ファンの構成を示す室内機全体の構造の断面図である。It is sectional drawing of the structure of the whole indoor unit which shows the structure of the conventional centrifugal fan applied to the indoor unit for ceiling embedded type air conditioners. 同遠心ファンの斜視図である。It is a perspective view of the centrifugal fan. 同遠心ファンの要部の平面図である。It is a top view of the principal part of the centrifugal fan. 同遠心ファンの側板およびベルマウス間の構成を示す断面図である。It is sectional drawing which shows the structure between the side plate and bellmouth of the centrifugal fan. 同遠心ファンの羽根の主板側接続部付近の構成と作用を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure and effect | action of the main plate side connection part vicinity of the blade | wing of the centrifugal fan. 同遠心ファンの羽根の問題点を示す羽根の前方側から見た要部の拡大縦断面図である。It is an expanded longitudinal cross-sectional view of the principal part seen from the front side of the blade | wing which shows the problem of the blade | wing of the centrifugal fan. 同遠心ファンの羽根の問題点を示す要部の拡大水平断面図である。It is an expanded horizontal sectional view of the principal part which shows the problem of the blade | wing of the centrifugal fan.

符号の説明Explanation of symbols

６はベルマウス、１０は通風路、１１は遠心ファン（ターボファン）、１４は主板（ハブ）、１５は側板（シュラウド）、１５ａは空気吸込側端部、１６は羽根（動翼羽根）、１６ａは羽根１６の前縁である。   6 is a bell mouth, 10 is a ventilation path, 11 is a centrifugal fan (turbo fan), 14 is a main plate (hub), 15 is a side plate (shroud), 15a is an air suction side end, 16 is a blade (moving blade blade), Reference numeral 16 a denotes a leading edge of the blade 16.

Claims (5)

モータ回転軸により回転駆動される円形の主板と、この主板の外周部に周方向に所定の間隔をおいて一端側を固定された複数枚の羽根と、これら複数枚の羽根の上記主板と反対側の端部に取り付けられた中央側空気吸込口から外周側遠心方向へ所定の曲率で傾斜する断面円弧形状の側板とを備えてなる遠心ファンであって、上記複数枚の羽根には、それぞれ馬蹄形渦抑制部が設けられていることを特徴とする遠心ファン。   A circular main plate that is rotationally driven by a motor rotating shaft, a plurality of blades fixed at one end side to the outer peripheral portion of the main plate at a predetermined interval in the circumferential direction, and opposite to the main plate of the plurality of blades A centrifugal fan comprising a side plate having a circular arc cross section inclined at a predetermined curvature from the central air suction port attached to the end of the side to the outer peripheral side centrifugal direction, each of the plurality of blades, A centrifugal fan comprising a horseshoe-shaped vortex suppressor. 馬蹄形渦抑制部は、主板側前縁近傍の回転方向への湾曲構造よりなることを特徴とする請求項１記載の遠心ファン。   The centrifugal fan according to claim 1, wherein the horseshoe-shaped vortex suppressing portion has a curved structure in a rotating direction in the vicinity of the main plate side front edge. 馬蹄形渦抑制部は、主板側前縁近傍の反回転方向への湾曲構造よりなることを特徴とする請求項１記載の遠心ファン。   The centrifugal fan according to claim 1, wherein the horseshoe vortex suppressing portion has a curved structure in the counter-rotating direction in the vicinity of the main plate side front edge. 馬蹄形渦抑制部は、前縁の主板側が部分的に前進する前進翼構造よりなることを特徴とする請求項２又は３記載の遠心ファン。   The centrifugal fan according to claim 2 or 3, wherein the horseshoe-shaped vortex suppressing portion has a forward wing structure in which the main plate side of the front edge partially advances. 馬蹄形渦抑制部は、前縁の主板側が部分的に後退する後退翼構造よりなることを特徴とする請求項１，２又は３記載の遠心ファン。   The centrifugal fan according to claim 1, 2 or 3, wherein the horseshoe vortex suppressing part has a receding wing structure in which the main plate side of the front edge is partially retracted.
JP2007303999A 2007-11-26 2007-11-26 Centrifugal fan Pending JP2009127541A (en)

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JP2012085836A (en) * 2010-10-20 2012-05-10 Panasonic Corp Washing and drying machine
CN104903590A (en) * 2012-12-21 2015-09-09 大金工业株式会社 Centrifugal fan
JP2017067056A (en) * 2015-10-02 2017-04-06 三菱重工業株式会社 Turbo fan and air conditioner using the turbo fan
JP2019127865A (en) * 2018-01-23 2019-08-01 株式会社デンソー Centrifugal fan

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JP2012085836A (en) * 2010-10-20 2012-05-10 Panasonic Corp Washing and drying machine
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JP2017067056A (en) * 2015-10-02 2017-04-06 三菱重工業株式会社 Turbo fan and air conditioner using the turbo fan
JP2019127865A (en) * 2018-01-23 2019-08-01 株式会社デンソー Centrifugal fan

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