JP5393520B2

JP5393520B2 - Axial blower

Info

Publication number: JP5393520B2
Application number: JP2010028700A
Authority: JP
Inventors: 紘一梅津; 光宏代田; 達哉望月
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2010-02-12
Filing date: 2010-02-12
Publication date: 2014-01-22
Anticipated expiration: 2030-02-12
Also published as: JP2011163259A

Description

この発明は、空気調和機の室外機、換気装置等に使われる軸流送風機に関する。 The present invention relates to an axial blower used for an outdoor unit of an air conditioner, a ventilator or the like.

一般的に樹脂により全体が一体に成形されている軸流送風機は、金属により構成されているものに比べ材料的にもろく、輸送時に軸流送風機同士の衝突によりクラックが生じるという課題があった。 In general, an axial blower that is integrally formed of a resin is fragile in material as compared with that made of metal, and there is a problem that a crack occurs due to a collision between the axial blowers during transportation.

そこで、軸流送風機のボス背面部に複数の板状リブを、ボス前面部にこれに対応する複数個の直方体状の一対の突起を設け、積み重ねによる回転方向の動きを抑制し、輸送時の送風機同士の衝突による破損を防止する軸流送風機が提案されている（例えば、特許文献１参照）。 Therefore, a plurality of plate-like ribs are provided on the back surface of the boss of the axial blower, and a plurality of corresponding rectangular parallelepiped protrusions are provided on the front surface of the boss to suppress movement in the rotational direction due to stacking. An axial flow blower that prevents breakage due to collision between blowers has been proposed (see, for example, Patent Document 1).

実開昭５７−１６０００号公報Japanese Utility Model Publication No. 57-16000

しかしながら、上記特許文献１に記載された従来の軸流送風機は、突起の形状が直方体状であるため、軸流送風機を積み重ねる際に、ボス背面側リブと一対の突起の位相をずらして重ねた場合、軸流送風機の回転方向に回して挿入しようとしても引っ掛かってしまうという課題がある。 However, since the shape of the protrusion of the conventional axial flow fan described in Patent Document 1 is a rectangular parallelepiped, the boss rear surface rib and the pair of protrusions are shifted in phase when the axial flow fans are stacked. In this case, there is a problem that even if it is rotated and inserted in the rotational direction of the axial blower, it is caught.

また、突起の形状が直方体状であるため、運転時に流れを大きく乱し、モータの消費電力が悪化し、また騒音が悪化する課題がある。 Further, since the shape of the protrusion is a rectangular parallelepiped, there is a problem that the flow is greatly disturbed during operation, the power consumption of the motor is deteriorated, and the noise is deteriorated.

この発明は、上記のような課題を解決するためになされたもので、以下に示す事項を目的とする軸流送風機を提供する。
（１）軸流送風機の積み重ね時の作業性が良好である；
（２）軸流送風機の輸送時の破損を防止できる；
（３）モータの消費電力及び騒音の悪化を最小限にできる。 The present invention has been made to solve the above-described problems, and provides an axial blower for the purpose described below.
(1) Good workability when stacking axial blowers;
(2) Can prevent damage during transportation of the axial blower;
(3) Deterioration of motor power consumption and noise can be minimized.

この発明に係る軸流送風機は、
ボスと、ボスの外周部に設けられる複数の羽根とを有し、
ボスは、
軸方向の一方の端面に形成される複数対の突起と、
径方向に板状に延び、軸方向の他方から露出する複数の補強リブとを備え、
複数対の突起の各対は、
ボスの回転方向における前側から後側に向かって高さが徐々に高くなっている前側の突起と、
前側の突起よりもボスの回転方向における後側に配置され、ボスの回転方向における前側から後側に向かって高さが徐々に低くなっている後側の突起とで構成され、
複数の軸流送風機が積み重ねられる時に、複数の補強リブの各々の露出した部分が複数対の突起の各対の前側の突起と後側の突起との間に嵌合するように、前側の突起と後側の突起との間の、ボスの周方向における距離Ｌが、複数の補強リブの各々の板厚Ｍよりも長いものである。 The axial blower according to the present invention is
Possess the boss, and a plurality of blades provided on the outer periphery of the boss,
The boss
A plurality of pairs of protrusions formed on the end surface of the hand in the axial direction,
It extends into a plate shape in the radial direction, and a plurality of reinforcement ribs you exposed from the axial direction of the other,
Each pair of multiple pairs of protrusions
A front protrusion height toward the rear side is gradually increased from the front side to definitive in the rotational direction of the boss,
Than the front projections disposed on the rear side in the rotational direction of the boss, is constituted by the side of the protrusion after gradually decreases in height from the front side toward the rear side of definitive in the rotational direction of the boss,
When a plurality of axial flow fan is Ru stacked, so that each exposed portion of the plurality of reinforcing ribs are fitted between the front protrusion and the rear protrusion of each pair of pairs of projections, the front A distance L between the protrusion and the rear protrusion in the circumferential direction of the boss is longer than the plate thickness M of each of the plurality of reinforcing ribs .

この発明に係る軸流送風機は、ボスの軸方向の一方の端面に複数対の突起を設け、複数対の突起の各対を、ボスの回転方向における前側から後側に向かって高さが徐々に高くなっている前側の突起と、前側の突起よりもボスの回転方向における後側に配置され、ボスの回転方向における前側から後側に向かって高さが徐々に低くなっている後側の突起とで構成し、前側の突起と後側の突起との間の、ボスの周方向における距離Ｌを、複数の補強リブの各々の板厚Ｍよりも長くしたので、積み重ね時の作業性がよく、輸送時の破損を防止でき、且つ、モータの消費電力及び騒音の悪化を最小限にできるという効果が得られる。 Axial blower according to the present invention, a plurality pairs of projections on one end face of the axial direction of the boss, each pair of a plurality pairs of projections, the height from the front side toward the rear side of definitive in the rotational direction of the boss and front projection is gradually increased, it is arranged on the rear side in the rotational direction of the boss than the front of the projection, after gradually decreases in height from the front side toward the rear side of definitive in the rotational direction of the boss The distance L in the circumferential direction of the boss between the front protrusion and the rear protrusion is longer than the plate thickness M of each of the plurality of reinforcing ribs . good workability can be prevented from being damaged during transportation, and, Ru effect is obtained that the deterioration of the power consumption and noise of the motor can be minimized.

実施の形態１を示す図で、軸流送風機１の正面図。FIG. 3 shows the first embodiment, and is a front view of the axial blower 1. 実施の形態１を示す図で、軸流送風機１の背面図。FIG. 3 is a diagram showing the first embodiment, and is a rear view of the axial blower 1. 実施の形態１を示す図で、軸流送風機１のボス２の背面図。FIG. 3 is a diagram showing the first embodiment, and is a rear view of a boss 2 of the axial blower 1. 実施の形態１を示す図で、軸流送風機１の部分断面図。FIG. 3 shows the first embodiment, and is a partial cross-sectional view of the axial flow fan 1. 実施の形態１を示す図で、軸流送風機１のボス２の斜視図。FIG. 3 is a diagram illustrating the first embodiment, and is a perspective view of a boss 2 of the axial blower 1. 実施の形態１を示す図で、軸流送風機１の前側の突起３ａの斜視図。FIG. 5 shows the first embodiment, and is a perspective view of a protrusion 3a on the front side of the axial blower 1; 実施の形態１を示す図で、軸流送風機１の後側の突起３ｂの斜視図。FIG. 5 shows the first embodiment, and is a perspective view of a protrusion 3b on the rear side of the axial flow fan 1; 実施の形態１を示す図で、一対の突起３（前側の突起３ａ及び後側の突起３ｂ）の側面図。FIG. 5 shows the first embodiment, and is a side view of a pair of protrusions 3 (a front protrusion 3a and a rear protrusion 3b). 実施の形態１を示す図で、軸流送風機１を積み重ねた状態を示す側面図。The figure which shows Embodiment 1 and is the side view which shows the state which accumulated the axial flow fan 1. FIG. 実施の形態１を示す図で、軸流送風機１及び従来の軸流送風機を空気調和機の室外機の送風機として用い、風量２５ｍ^３／ｍｉｎにおけるファンモータの消費電力、騒音値を比較測定した結果を示す図。The figure which shows Embodiment 1 is the result which compared and measured the power consumption and noise value of the fan motor in the air volume of 25 m < ³ > / min, using the axial flow fan 1 and the conventional axial flow fan as a blower of the outdoor unit of an air conditioner. FIG. 実施の形態１を示す図で、高さの異なる前側の突起３ａ及び後側の突起３ｂの側面図。FIG. 5 shows the first embodiment and is a side view of the front protrusion 3a and the rear protrusion 3b having different heights. 実施の形態１を示す図で、後側の突起３ｂの頂上部３ｆｂが曲面を形成している前側の突起３ａ及び後側の突起３ｂの側面図。FIG. 5 shows the first embodiment, and is a side view of the front protrusion 3a and the rear protrusion 3b in which the top 3fb of the rear protrusion 3b forms a curved surface. 実施の形態１を示す図で、軸流送風機１の変形例のボス２の斜視図。FIG. 5 shows the first embodiment, and is a perspective view of a boss 2 of a modification of the axial blower 1.

実施の形態１．
図１乃至図１３は実施の形態１を示す図で、図１は軸流送風機１の正面図、図２は軸流送風機１の背面図、図３は軸流送風機１のボス２の背面図、図４は軸流送風機１の部分断面図、図５は軸流送風機１のボス２の斜視図、図６は軸流送風機１の前側の突起３ａの斜視図、図７は軸流送風機１の後側の突起３ｂの斜視図、図８は一対の突起３（前側の突起３ａ及び後側の突起３ｂ）の側面図、図９は軸流送風機１を積み重ねた状態を示す側面図、図１０は軸流送風機１及び従来の軸流送風機を空気調和機の室外機の送風機として用い、風量２５ｍ^３／ｍｉｎにおけるファンモータの消費電力、騒音値を比較測定した結果を示す図、図１１は高さの異なる前側の突起３ａ及び後側の突起３ｂの側面図、図１２は後側の突起３ｂの頂上部３ｆｂが曲面を形成している前側の突起３ａ及び後側の突起３ｂの側面図、図１３は軸流送風機１の変形例のボス２の斜視図である。
である。 Embodiment 1 FIG.
FIGS. 1 to 13 are diagrams showing the first embodiment. FIG. 1 is a front view of the axial fan 1, FIG. 2 is a rear view of the axial fan 1, and FIG. 3 is a rear view of the boss 2 of the axial fan 1. 4 is a partial cross-sectional view of the axial blower 1, FIG. 5 is a perspective view of the boss 2 of the axial blower 1, FIG. 6 is a perspective view of the protrusion 3a on the front side of the axial blower 1, and FIG. FIG. 8 is a side view of a pair of protrusions 3 (a front protrusion 3a and a rear protrusion 3b), and FIG. 9 is a side view illustrating a state in which the axial blower 1 is stacked. 10 is a diagram showing the results of comparative measurement of power consumption and noise value of a fan motor at an air flow rate of 25 m ³ / min, using the axial blower 1 and a conventional axial blower as a blower for an outdoor unit of an air conditioner, FIG. FIG. 12 is a side view of the front projection 3a and the rear projection 3b having different heights, and FIG. 12 shows the top 3fb of the rear projection 3b. Side view of the protrusion 3b of the projection 3a and the rear side of the front forming a curved surface, FIG. 13 is a perspective view of the boss 2 of the modification of the axial flow fan 1.
It is.

図１〜図４に示すように、軸流送風機１は、円筒状のボス２と、このボス２の円筒部２ｂの外周面に、複数の羽根４（図１の例は、羽根４が３枚）が径方向に略等間隔に設けられる。円筒状のボス２と複数の羽根４とは、一体で成形してもよいし、または別部品のボス２と羽根４とを固着してもよい。 As shown in FIGS. 1 to 4, the axial blower 1 includes a cylindrical boss 2 and a plurality of blades 4 on the outer peripheral surface of the cylindrical portion 2 b of the boss 2. Are provided at substantially equal intervals in the radial direction. The cylindrical boss 2 and the plurality of blades 4 may be integrally formed, or the boss 2 and the blade 4 which are separate parts may be fixed.

ボス２は、以下に示す要素を備える。
（１）ボス前面部２ａ；
（２）円筒形状のボス円筒部２ｂ；
（３）ボス円筒部２ｂの内側略中心軸部分に位置し、ファンモータのシャフトが固定される円筒状のモータ軸連結部２ｃ；
（４）ボス裏面部２ｄとボス円筒部２ｂの一端部２ｅとの間に形成され、モータ軸連結部２ｃを中心にして放射状に広がる板状の補強リブ２ｆ（ここでは、補強リブ２ｆが６枚の例を示すが、その数は任意でよい）；
（５）ボス前面部２ａ（略円形）の外周縁に沿って、周方向の複数箇所に略等間隔に設けられる一対の突起３（前側の突起３ａ、後側の突起３ｂ）。ここでは、一対の突起３（前側の突起３ａ、後側の突起３ｂ）が、周方向の三箇所に略等間隔に設けられる。但し、一対の突起３（前側の突起３ａ、後側の突起３ｂ）は、何箇所に設けられてもよい。ここで、前側の突起３ａとは、軸流送風機１の回転方向に対して前側に位置するものをいう。また、後側の突起３ｂとは、軸流送風機１の回転方向に対して後側に位置するものをいう。 The boss 2 includes the following elements.
(1) Boss front surface 2a;
(2) Cylindrical boss cylindrical portion 2b;
(3) Cylindrical motor shaft coupling portion 2c, which is located at the substantially inner central axis portion of boss cylindrical portion 2b and to which the fan motor shaft is fixed;
(4) A plate-like reinforcing rib 2f formed between the boss back surface portion 2d and one end portion 2e of the boss cylindrical portion 2b and radially extending around the motor shaft connecting portion 2c (here, the reinforcing rib 2f is 6). An example of the sheet is shown, but the number may be arbitrary);
(5) A pair of protrusions 3 (a front protrusion 3a and a rear protrusion 3b) provided at substantially equal intervals along a peripheral edge of the boss front surface 2a (substantially circular). Here, a pair of projections 3 (a front projection 3a and a rear projection 3b) are provided at substantially equal intervals at three locations in the circumferential direction. However, the pair of protrusions 3 (the front protrusion 3a and the rear protrusion 3b) may be provided at any number of locations. Here, the front-side protrusion 3 a refers to one located on the front side with respect to the rotational direction of the axial blower 1. Further, the rear protrusion 3 b refers to one located on the rear side with respect to the rotational direction of the axial blower 1.

軸流送風機１は、ボス２に形成されているモータ軸連結部２ｃと、ファンモータ（図示せず）のシャフト（図示せず）が固定されて、ファンモータによって回転方向（図１の矢印、ここでは軸流送風機１の正面から見て時計方向）に回転駆動される。 The axial blower 1 has a motor shaft coupling portion 2c formed on the boss 2 and a shaft (not shown) of a fan motor (not shown) fixed thereto, and the direction of rotation (arrows in FIG. Here, it is rotationally driven clockwise as viewed from the front of the axial blower 1.

次に、図５乃至図８により、一対の突起３（前側の突起３ａ、後側の突起３ｂ）の構成を詳述する。一対の突起３（前側の突起３ａ、後側の突起３ｂ）は、ボス前面部２ａ（略円形）の外周縁に沿って、周方向の複数箇所（ここでは、三箇所）に略等間隔に設けられるが、一対の突起３において、前側の突起３ａ、後側の突起３ｂは、周方向に所定の距離Ｌ離れて、鏡面対称に配置される。 Next, the configuration of the pair of protrusions 3 (the front protrusion 3a and the rear protrusion 3b) will be described in detail with reference to FIGS. The pair of protrusions 3 (the front protrusion 3a and the rear protrusion 3b) are arranged at substantially equal intervals along a peripheral edge of the boss front surface portion 2a (substantially circular) at a plurality of circumferential positions (here, three positions). In the pair of protrusions 3, the front protrusion 3 a and the rear protrusion 3 b are arranged in a mirror symmetry with a predetermined distance L in the circumferential direction.

前側の突起３ａ、後側の突起３ｂは、例えば、モータ軸連結部２ｃ側から見た場合、略直角三角形状である（図８参照）。 The front protrusion 3a and the rear protrusion 3b have, for example, a substantially right triangle shape when viewed from the motor shaft connecting portion 2c side (see FIG. 8).

図６（図８も参照）に示すように、前側の突起３ａは略楔状であり、ボス前面部２ａの面（図６では下面）である前側の突起３ａの底面３ｄａ（図８参照）の反対側の面（図６では上面）が、斜面３ｃａになっている。また、前側の突起３ａの後側の突起３ｂに対向する面を、対向面３ｅａとする。さらに、斜面３ｃａと対向面３ｅａとの交点（図８上で）付近を、頂上部３ｆａとする。 As shown in FIG. 6 (see also FIG. 8), the front protrusion 3a is substantially wedge-shaped, and is a bottom surface 3da (see FIG. 8) of the front protrusion 3a which is the surface of the boss front surface 2a (the lower surface in FIG. 6). The opposite surface (upper surface in FIG. 6) is an inclined surface 3ca. A surface facing the rear projection 3b of the front projection 3a is defined as a facing surface 3ea. Further, the vicinity of the intersection (on the top of FIG. 8) between the slope 3ca and the facing surface 3ea is defined as the top 3fa.

また、図７（図８も参照）に示すように、後側の突起３ｂも略楔状であり、ボス前面部２ａの面（図７では下面）である後側の突起３ｂの底面３ｄｂ（図８参照）の反対側の面（図７では上面）が、斜面３ｃｂになっている。また、後側の突起３ｂの前側の突起３ａに対向する面を、対向面３ｅｂとする。さらに、斜面３ｃｂと対向面３ｅｂとの交点（図８上で）付近を、頂上部３ｆｂとする。 Further, as shown in FIG. 7 (see also FIG. 8), the rear projection 3b is also substantially wedge-shaped, and the bottom surface 3db (see FIG. 7) of the rear projection 3b, which is the surface of the boss front surface portion 2a (the lower surface in FIG. 7). 8 (see FIG. 7) is an inclined surface 3cb. A surface of the rear projection 3b that faces the front projection 3a is referred to as a facing surface 3eb. Further, the vicinity of the intersection (on the top of FIG. 8) between the slope 3cb and the facing surface 3eb is defined as the top 3fb.

一対の突起３（前側の突起３ａ、後側の突起３ｂ）の、前側の突起３ａの対向面３ｅａ、後側の突起３ｂの対向面３ｅｂは、隙間Ｌを隔てている。隙間Ｌは補強リブ２ｆの板厚Ｍ（図３参照）よりも大きい隙間である。即ち、隙間Ｌ＞補強リブ２ｆの板厚Ｍである。 The facing surface 3ea of the front projection 3a and the facing surface 3eb of the rear projection 3b of the pair of projections 3 (the front projection 3a and the rear projection 3b) are separated from each other by a gap L. The gap L is a gap larger than the plate thickness M (see FIG. 3) of the reinforcing rib 2f. That is, the clearance L> the thickness M of the reinforcing rib 2f.

一対の突起３（前側の突起３ａ、後側の突起３ｂ）において、前側の突起３ａの対向面３ｅａ、後側の突起３ｂの対向面３ｅｂが向きあい、前側の突起３ａの底面３ｄａ、後側の底面３ｄｂは、ボス前面部２ａと接合した状態で形成されている。 In the pair of protrusions 3 (front protrusion 3a, rear protrusion 3b), the facing surface 3ea of the front protrusion 3a faces the facing surface 3eb of the rear protrusion 3b, and the bottom surface 3da of the front protrusion 3a The bottom surface 3db is formed in a state of being joined to the boss front surface portion 2a.

また、一対の突起３（前側の突起３ａ、後側の突起３ｂ）は、ボス前面部２ａ上に設けられ、且つモータ軸連結部２ｃを略中心として、ボス円筒部２ｂの内周で描かれる円の内側の位置に設けられる。例えば、図５に図示した複数の一対の前側の突起３ａ、後側の突起３ｂの組は、略同心円状に配置しているが、必ずしもそれが必須ではない。 The pair of protrusions 3 (the front protrusion 3a and the rear protrusion 3b) are provided on the boss front surface portion 2a, and are drawn on the inner periphery of the boss cylindrical portion 2b with the motor shaft coupling portion 2c as a substantial center. It is provided at a position inside the circle. For example, the pair of a plurality of pairs of front protrusions 3a and rear protrusions 3b illustrated in FIG. 5 are arranged substantially concentrically, but this is not essential.

前側の突起３ａのボス前面部２ａからの突出高さ（前側の突起３ａの高さ）をＨａとする。また、後側の突起３ｂのボス前面部２ａからの突出高さ（後側の突起３ｂの高さ）をＨｂとする。図８の例は、ＨａはＨｂに略等しい。 The protrusion height of the front protrusion 3a from the boss front surface 2a (the height of the front protrusion 3a) is Ha. Further, the protrusion height of the rear protrusion 3b from the boss front surface 2a (the height of the rear protrusion 3b) is defined as Hb. In the example of FIG. 8, Ha is approximately equal to Hb.

図９に示すように、軸流送風機１を、そのボス前面部２ａを下にして積み重ねる場合、隣接する軸流送風機１の補強リブ２ｆと一対の突起３（前側の突起３ａ、後側の突起３ｂ）とを同位相で積み重ねると、前側の突起３ａの対向面３ｅａと後側の突起３ｂの対向面３ｅｂとの隙間Ｌが、補強リブ２ｆの板厚Ｍよりも大きいので、補強リブ２ｆが一対の突起３（前側の突起３ａ、後側の突起３ｂ）の隙間に嵌合する。 As shown in FIG. 9, when stacking the axial blower 1 with the boss front face portion 2 a facing down, the reinforcing rib 2 f of the adjacent axial blower 1 and a pair of protrusions 3 (front protrusion 3 a, rear protrusion) 3b) are stacked in the same phase, the gap L between the opposing surface 3ea of the front projection 3a and the opposing surface 3eb of the rear projection 3b is larger than the plate thickness M of the reinforcing rib 2f. It fits into the gap between the pair of protrusions 3 (front protrusion 3a, rear protrusion 3b).

従って、軸流送風機１の輸送時に、振動で積み重ねた軸流送風機１が軸回りにずれなくなり、上下の軸流送風機１の羽根４が相互に当接して破損するという事故を未然に防止できる。 Therefore, when the axial blower 1 is transported, it is possible to prevent an accident that the axial blower 1 stacked by vibration does not shift around the axis and the blades 4 of the upper and lower axial blowers 1 come into contact with each other and are damaged.

また、補強リブ２ｆと一対の前側の突起３ａ、後側の突起３ｂの位相がずれて積み重ねられた場合（補強リブ２ｆが、一対の突起３（前側の突起３ａ、後側の突起３ｂ）の隙間に嵌合していない状態）、一対の突起３（前側の突起３ａ、後側の突起３ｂ）は略三角形状であるから、軸流送風機１を軸方向に回転させると、補強リブ２ｆが前側の突起３ａの斜面３ｃａもしくは後側の突起３ｂの斜面３ｃｂに引っかかることなく乗り上げて、一対の突起３（前側の突起３ａ、後側の突起３ｂ）の隙間に補強リブ２ｆが嵌まるので、積み重ね時の作業性が良い。 Further, when the reinforcing rib 2f and the pair of front protrusions 3a and the rear protrusion 3b are stacked out of phase (the reinforcing rib 2f is a pair of protrusions 3 (the front protrusion 3a and the rear protrusion 3b)). Since the pair of protrusions 3 (the front protrusion 3a and the rear protrusion 3b) are substantially triangular, the reinforcing rib 2f is rotated when the axial blower 1 is rotated in the axial direction. Riding without getting caught on the slope 3ca of the front projection 3a or the slope 3cb of the rear projection 3b, the reinforcing rib 2f fits into the gap between the pair of projections 3 (front projection 3a, rear projection 3b). Good workability when stacking.

また、一対の突起３（前側の突起３ａ、後側の突起３ｂ）の、ボス２の半径方向に対する位置は、内側より外側のほうが力のモーメントが大きく積み重ね時の輸送時の振動への耐力が強くなるため、前側の突起３ａ、後側の突起３ｂの高さを低くすることが出来、ファンモータの消費電力及び騒音値の悪化をより抑えることが出来る。 Further, the position of the pair of protrusions 3 (front protrusion 3a, rear protrusion 3b) in the radial direction of the boss 2 has a greater moment of force on the outer side than on the inner side, and the resistance to vibration during transportation during stacking is greater. Since it becomes strong, the height of the front projection 3a and the rear projection 3b can be reduced, and the power consumption and noise level of the fan motor can be further suppressed.

軸流送風機１が回転する際に、ボス２に突起等があると流れの抵抗となりモータの消費電力及び騒音が悪化する可能性がある。本実施の形態の軸流送風機１の一対の前側の突起３ａ、後側の突起３ｂは、軸流送風機１が回転する際に、流れの抵抗となる前側の突起３ａが、回転方向に対して前側から後側に向かって緩やかな上り坂のような斜面３ｃａになっている。そのため流れの乱れが発生し難くなり、さらに後側の突起３ｂが回転方向に対して前側から後側に向かって緩やかな下り坂のような斜面３ｃｂになっているので、前側の突起３ａの斜面３ｃａ上を通過した流れが剥離することなく後側の突起３ｂの斜面３ｂａをなめて流れるため乱れの発生を最小限に抑えることが出来、モータの消費電力及び騒音の悪化を最小限に抑えることが出来る。 When the axial blower 1 rotates, if the boss 2 has protrusions or the like, the resistance of the flow becomes resistance and the power consumption and noise of the motor may be deteriorated. The pair of front projections 3a and the rear projections 3b of the axial blower 1 of the present embodiment are such that when the axial blower 1 rotates, the front projections 3a that serve as flow resistance are in the rotational direction. The slope 3ca is a gentle uphill from the front side toward the rear side. Therefore, flow disturbance is less likely to occur, and the rear protrusion 3b has a gentle slope 3cb from the front to the rear with respect to the rotational direction. Since the flow that has passed over 3ca flows while licking the slope 3ba of the rear projection 3b without peeling, the occurrence of turbulence can be minimized and the power consumption and noise deterioration of the motor can be minimized. I can do it.

本実施の形態の軸流送風機１及び従来の軸流送風機を空気調和機の室外機の送風機として用い、風量２５ｍ^３／ｍｉｎにおけるファンモータの消費電力、騒音値を比較測定した結果を図１０に示す。尚、比較測定を行った突起（直角三角形状の突起、直方体状の突起）の寸法形状は、以下の通りである。
（１）直角三角形状の突起（本実施の形態）：底辺が１５ｍｍ、高さ３ｍｍ、幅３ｍｍ、前側と後側の突起の間隔５ｍｍ；
（２）直方体状の突起（従来）：底辺５ｍｍ、高さ３ｍｍ、幅３ｍｍ、前側と後側の突起の間隔５ｍｍである。 FIG. 10 shows the results of comparative measurement of the power consumption and noise value of the fan motor at an air volume of 25 m ³ / min, using the axial flow fan 1 of the present embodiment and the conventional axial flow fan as the blower of the outdoor unit of the air conditioner. Show. In addition, the dimension shape of the processus | protrusion (right triangle-shaped processus | protrusion, rectangular parallelepiped processus | protrusion) which performed the comparative measurement is as follows.
(1) Right triangle projection (this embodiment): base is 15 mm, height is 3 mm, width is 3 mm, distance between front and rear projections is 5 mm;
(2) A rectangular parallelepiped protrusion (conventional): a base of 5 mm, a height of 3 mm, a width of 3 mm, and an interval between the front and rear protrusions of 5 mm.

図１０に示すように、ボス前面部２ａに設けられた一対の突起３（前側の突起３ａ、後側の突起３ｂ）の形状が略直角三角形状の軸流送風機１は、従来の一対の突起の形状が直方体状の軸流送風機よりも、風量２５ｍ^３／ｍｉｎにおける消費電力は０．２Ｗ低減でき、騒音値は０．２ｄＢＡ低減できる。 As shown in FIG. 10, the axial blower 1 in which the shape of the pair of protrusions 3 (the front protrusion 3a and the rear protrusion 3b) provided on the boss front surface 2a is a substantially right triangle is the conventional pair of protrusions. As compared with an axial flow fan having a rectangular parallelepiped shape, the power consumption at an air volume of 25 m ³ / min can be reduced by 0.2 W, and the noise value can be reduced by 0.2 dBA.

また、軸流送風機１が空気調和機の室外機、換気装置等に用いられる場合、軸流送風機１に指や物が接触しないように吹出し口に格子状のグリルが設けられることが考えられるが、格子よりも細い指や物が挿入され一対の突起３（前側の突起３ａ、後側の突起３ｂ）に接触したとしても、形状が略直角三角形状であり、前側の突起３ａは回転方向に対して前側から後側に向かって緩やかな上り坂のような形状になっているため、従来の軸流送風機の直方体状の突起よりも指や物が引っ掛かりにくい。 In addition, when the axial blower 1 is used for an outdoor unit or a ventilator of an air conditioner, it is conceivable that a lattice grill is provided at the outlet so that fingers and objects do not come into contact with the axial blower 1. Even if fingers or objects thinner than the lattice are inserted and contacted with the pair of protrusions 3 (the front protrusion 3a and the rear protrusion 3b), the shape is substantially a right triangle, and the front protrusion 3a is in the rotational direction. On the other hand, since it is shaped like a gentle uphill from the front side to the rear side, fingers and objects are less likely to be caught than a rectangular parallelepiped protrusion of a conventional axial fan.

また、一対の突起３の底面３ｄａ、３ｄｂの長さＸａ、Ｘｂ（図８参照）と突起の高さＨａ、Ｈｂの比Ｈａ／Ｘａ≦０．５であるとき、軸流送風機１の回転時に前側の突起３ａの斜面を流れが滑らかに流れることで流れの乱れを抑えることが出来る。実施例として、前側の突起３ａの底辺が１５ｍｍ、高さ３ｍｍであるとき、Ｈａ／Ｘａ＝０．２となり、流れの乱れを抑えることが出来る。 Further, when the ratio Ha / Xa ≦ 0.5 between the lengths Xa and Xb (see FIG. 8) of the bottom surfaces 3da and 3db of the pair of protrusions 3 and the heights Ha and Hb of the protrusions, the axial flow fan 1 is rotated. Flow turbulence can be suppressed by flowing smoothly through the slope of the front projection 3a. As an example, when the bottom side of the front projection 3a is 15 mm and the height is 3 mm, Ha / Xa = 0.2, and the flow disturbance can be suppressed.

また、図１１に示すように、一対の突起３（前側の突起３ａ、後側の突起３ｂ）において、後側の突起３ｂの高さＨｂが前側の突起３ａの高さＨａよりも低いことで（Ｈａ＞Ｈｂ）、軸流送風機１が回転時に、後側の突起３ｂと前側の突起３ａの高さが同じ場合（Ｈａ＝Ｈｂ）に比べて、指や物が接触しても引っ掛かりにくくなる。 Further, as shown in FIG. 11, in the pair of protrusions 3 (the front protrusion 3a and the rear protrusion 3b), the height Hb of the rear protrusion 3b is lower than the height Ha of the front protrusion 3a. (Ha> Hb) When the axial blower 1 rotates, the rear projection 3b and the front projection 3a have the same height (Ha = Hb), so that it is less likely to get caught even if a finger or an object contacts. .

また、例えば、前側の突起３ａの底辺が１５ｍｍ、高さ３ｍｍ、前側と後側の突起の間隔が５ｍｍのとき、後側の高さＨｂが前側の高さＨａの０．７〜１．０倍（３．５〜５ｍｍ）であれば、軸流送風機１の回転時に、前側の突起３ａから剥離する流れが後側の突起３ｂに再付着して流れの乱れを抑えることが出来る。 Further, for example, when the base of the front protrusion 3a is 15 mm, the height is 3 mm, and the distance between the front and rear protrusions is 5 mm, the rear height Hb is 0.7 to 1.0 of the front height Ha. If it is double (3.5 to 5 mm), when the axial blower 1 is rotated, the flow peeled off from the front projection 3a is reattached to the rear projection 3b, and the flow disturbance can be suppressed.

また、図１２に示すように、一対の突起３（前側の突起３ａ、後側の突起３ｂ）の後側の突起３ｂの頂上部３ｆｂが曲面を形成していることで、軸流送風機１が回転時、一対の突起３に指や物が接触しても引っ掛かりにくくなり、また後側の突起３ｂの頂上部３ｆｂで流れの剥離が起きにくくなる。 Further, as shown in FIG. 12, the top 3fb of the rear projection 3b of the pair of projections 3 (the front projection 3a and the rear projection 3b) forms a curved surface. During rotation, even if a finger or an object comes into contact with the pair of protrusions 3, it is difficult to get caught, and flow separation is less likely to occur at the top 3 fb of the rear protrusion 3 b.

また、図１３に示す変形例のように、ボス２において、前側の突起３ａ、後側の突起３ｂは必ずしも同心円状に配置される必要はない。前側の突起３ａ、後側の突起３ｂが同心円状に配置されない場合、軸流送風機１を積み重ねる際に作業性がよく、輸送時の破損を防止できるが、前側の突起３ａから流れが剥離し、かつ後側の突起の対向面３ｅｂが流れの抵抗となり、モータの消費電力及び騒音が悪化してしまう。但し、図１３に示すように、後側の突起３ｂをモータ軸連結部２ｃの近傍に配置することで、後側の突起３ｂの対向面３ｅｂに衝突する流れの相対速度が遅くなるため、モータの消費電力及び騒音の悪化を抑えることが出来る。 Further, as in the modification shown in FIG. 13, in the boss 2, the front protrusion 3 a and the rear protrusion 3 b are not necessarily arranged concentrically. When the front protrusion 3a and the rear protrusion 3b are not arranged concentrically, workability is good when stacking the axial blower 1 and damage during transportation can be prevented, but the flow is separated from the front protrusion 3a, In addition, the opposing surface 3eb of the rear projection serves as a flow resistance, and the power consumption and noise of the motor deteriorate. However, as shown in FIG. 13, since the rear projection 3b is arranged in the vicinity of the motor shaft connecting portion 2c, the relative velocity of the flow that collides with the opposing surface 3eb of the rear projection 3b is reduced. Power consumption and noise deterioration can be suppressed.

１軸流送風機、２ボス、２ａボス前面部、２ｂ円筒部、２ｃモータ軸連結部、２ｄボス裏面部、２ｅ一端部、２ｆ補強リブ、３一対の突起、３ａ前側の突起、３ｂ後側の突起、３ｃａ斜面、３ｃｂ斜面、３ｄａ底面、３ｄｂ底面、３ｅａ対向面、３ｅｂ対向面、３ｆａ頂上部、３ｆｂ頂上部、４羽根、５回転方向。 1 axial blower, 2 boss, 2a boss front part, 2b cylindrical part, 2c motor shaft connecting part, 2d boss back face part, 2e one end part, 2f reinforcing rib, 3 pair of protrusions, 3a front protrusion, 3b rear side Projection, 3ca slope, 3cb slope, 3da bottom, 3db bottom, 3ea facing surface, 3eb facing surface, 3fa top, 3fb top, 4 blades, 5 rotation direction.

Claims

ボスと、前記ボスの外周部に設けられる複数の羽根とを有する軸流送風機において、
前記ボスは、
軸方向の一方の端面に形成される複数対の突起と、
径方向に板状に延び、軸方向の他方から露出する複数の補強リブとを備え、
前記複数対の突起の各対は、
前記ボスの回転方向における前側から後側に向かって高さが徐々に高くなっている前側の突起と、
前記前側の突起よりも前記ボスの回転方向における後側に配置され、前記ボスの回転方向における前側から後側に向かって高さが徐々に低くなっている後側の突起とで構成され、
複数の軸流送風機が積み重ねられる時に、前記複数の補強リブの各々の前記露出した部分が前記複数対の突起の各対の前記前側の突起と前記後側の突起との間に嵌合するように、前記前側の突起と前記後側の突起との間の、前記ボスの周方向における距離Ｌが、前記複数の補強リブの各々の板厚Ｍよりも長く、
前記複数対の突起の各対は、
前記後側の突起の高さＨｂが、前記前側の突起の高さＨａよりも低いことを特徴とする軸流送風機。 In the axial blower having a boss and a plurality of blades provided on the outer periphery of the boss,
The boss
A plurality of pairs of protrusions formed on one end face in the axial direction;
A plurality of reinforcing ribs extending in a plate shape in the radial direction and exposed from the other in the axial direction;
Each pair of the plurality of pairs of protrusions is
A front protrusion whose height gradually increases from the front side to the rear side in the rotational direction of the boss;
It is arranged on the rear side in the rotation direction of the boss with respect to the projection on the front side, and is configured with a rear projection whose height gradually decreases from the front side to the rear side in the rotation direction of the boss,
When the plurality of axial fans are stacked, the exposed portion of each of the plurality of reinforcing ribs is fitted between the front protrusion and the rear protrusion of each pair of the plurality of protrusions. a, between the rear of the protrusion and the front projection, the distance L in the circumferential direction of the boss, rather long than the thickness M of each of the plurality of reinforcing ribs,
Each pair of the plurality of pairs of protrusions is
Height Hb of the rear projections, axial-flow fan, wherein lower Ikoto than the height Ha of the front protrusion.

ボスと、前記ボスの外周部に設けられる複数の羽根とを有する軸流送風機において、
前記ボスは、
軸方向の一方の端面に形成される複数対の突起と、
径方向に板状に延び、軸方向の他方から露出する複数の補強リブとを備え、
前記複数対の突起の各対は、
前記ボスの回転方向における前側から後側に向かって高さが徐々に高くなっている前側の突起と、
前記前側の突起よりも前記ボスの回転方向における後側に配置され、前記ボスの回転方向における前側から後側に向かって高さが徐々に低くなっている後側の突起とで構成され、
複数の軸流送風機が積み重ねられる時に、前記複数の補強リブの各々の前記露出した部分が前記複数対の突起の各対の前記前側の突起と前記後側の突起との間に嵌合するように、前記前側の突起と前記後側の突起との間の、前記ボスの周方向における距離Ｌが、前記複数の補強リブの各々の板厚Ｍよりも長く、
前記複数対の突起の各対は、
前記後側の突起の頂上部が曲面を形成していることを特徴とする軸流送風機。 In the axial blower having a boss and a plurality of blades provided on the outer periphery of the boss,
The boss
A plurality of pairs of protrusions formed on one end face in the axial direction;
A plurality of reinforcing ribs extending in a plate shape in the radial direction and exposed from the other in the axial direction;
Each pair of the plurality of pairs of protrusions is
A front protrusion whose height gradually increases from the front side to the rear side in the rotational direction of the boss;
It is arranged on the rear side in the rotation direction of the boss with respect to the projection on the front side, and is configured with a rear projection whose height gradually decreases from the front side to the rear side in the rotation direction of the boss,
When the plurality of axial fans are stacked, the exposed portion of each of the plurality of reinforcing ribs is fitted between the front protrusion and the rear protrusion of each pair of the plurality of protrusions. a, between the rear of the protrusion and the front projection, the distance L in the circumferential direction of the boss, rather long than the thickness M of each of the plurality of reinforcing ribs,
Each pair of the plurality of pairs of protrusions is
An axial blower characterized in that the top of the rear projection forms a curved surface .

ボスと、前記ボスの外周部に設けられる複数の羽根とを有する軸流送風機において、
前記ボスは、
軸方向の一方の端面に形成される複数対の突起と、
径方向に板状に延び、軸方向の他方から露出する複数の補強リブとを備え、
前記複数対の突起の各対は、
前記ボスの回転方向における前側から後側に向かって高さが徐々に高くなっている前側の突起と、
前記前側の突起よりも前記ボスの回転方向における後側に配置され、前記ボスの回転方向における前側から後側に向かって高さが徐々に低くなっている後側の突起とで構成され、
複数の軸流送風機が積み重ねられる時に、前記複数の補強リブの各々の前記露出した部分が前記複数対の突起の各対の前記前側の突起と前記後側の突起との間に嵌合するように、前記前側の突起と前記後側の突起との間の、前記ボスの周方向における距離Ｌが、前記複数の補強リブの各々の板厚Ｍよりも長く、
前記複数対の突起の各対は、
前記後側の突起が、前記前側の突起よりも前記ボスの径方向における内側に配置されていることを特徴とする軸流送風機。 In the axial blower having a boss and a plurality of blades provided on the outer periphery of the boss,
The boss
A plurality of pairs of protrusions formed on one end face in the axial direction;
A plurality of reinforcing ribs extending in a plate shape in the radial direction and exposed from the other in the axial direction;
Each pair of the plurality of pairs of protrusions is
A front protrusion whose height gradually increases from the front side to the rear side in the rotational direction of the boss;
It is arranged on the rear side in the rotation direction of the boss with respect to the projection on the front side, and is configured with a rear projection whose height gradually decreases from the front side to the rear side in the rotation direction of the boss,
When the plurality of axial fans are stacked, the exposed portion of each of the plurality of reinforcing ribs is fitted between the front protrusion and the rear protrusion of each pair of the plurality of protrusions. a, between the rear of the protrusion and the front projection, the distance L in the circumferential direction of the boss, rather long than the thickness M of each of the plurality of reinforcing ribs,
Each pair of the plurality of pairs of protrusions is
The axial blower characterized in that the rear projection is arranged on the inner side in the radial direction of the boss than the front projection .