JP2011202826A - Axial flow blower, and air conditioner outdoor unit using the axial flow blower - Google Patents

Axial flow blower, and air conditioner outdoor unit using the axial flow blower Download PDF

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JP2011202826A
JP2011202826A JP2010068476A JP2010068476A JP2011202826A JP 2011202826 A JP2011202826 A JP 2011202826A JP 2010068476 A JP2010068476 A JP 2010068476A JP 2010068476 A JP2010068476 A JP 2010068476A JP 2011202826 A JP2011202826 A JP 2011202826A
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fan
propeller fan
propeller
axial
bell mouth
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JP5812572B2 (en
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Hiroki Okazawa
宏樹 岡澤
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To achieve power saving, compactness and fan input power reduction, while achieving noise reduction.SOLUTION: An axial flow blower includes: a propeller fan 4; a fan motor 6 that is disposed in an upstream of the propeller fan and drives the fan; a motor support member 8 that fixes the fan motor; and a fan grill 1 that has a cylindrical part 1a formed as a bell-mouth portion 2, one end of which covers a blow out port 3 and the other end of which covers an outer circumference of the outlet side of the propeller fan, and a box portion 1b whose cross-section is larger than that of the cylindrical part with which a lower part of the cylindrical part is communication-connected. On the cylindrical part of the fan grill, a cylindrical rib 12 that is covering the portion uncovered by the bell-mouth portion of the propeller fan and is projecting into the box portion, is provided.

Description

本発明は、小型化、低騒音化が可能な軸流送風機と、この軸流送風機を用いた空気調和機の室外機に関する。   The present invention relates to an axial fan that can be reduced in size and noise, and an outdoor unit of an air conditioner that uses the axial fan.

従来より、軸流送風機において、ファングリルの一部にベルマウス部を形成したものが知られている(例えば、特許文献1参照)。
このようなものにおいて、プロペラファンの周囲を覆っているベルマウス部が、プロペラファンの羽根の外周を、回転軸方向に全体を覆っていない場合、翼端渦が発生し易くなり、所定風量時のファン騒音、入力が大きくなる。
また、プロペラファンの周囲を覆っているベルマウス部が、プロペラファンの羽根の外周を、回転軸方向に全体を覆うように構成した場合、ベルマウス部の軸方向寸法が大きくなり、ファングリル全体として大形化を余儀なくされる。
2. Description of the Related Art Conventionally, an axial fan is known in which a bell mouth portion is formed on a part of a fan grill (for example, see Patent Document 1).
In such a case, if the bell mouth portion covering the periphery of the propeller fan does not cover the entire outer periphery of the propeller fan blade in the rotation axis direction, the tip vortex is likely to be generated, and at a predetermined air flow rate. The fan noise, the input becomes larger.
Also, if the bell mouth part covering the periphery of the propeller fan is configured to cover the entire outer periphery of the propeller fan blades in the direction of the rotation axis, the axial dimension of the bell mouth part becomes large, and the entire fan grille As a result, it must be enlarged.

特開2007−309632号公報(図8)JP2007-309632A (FIG. 8)

ところで、ビルや店舗用空気調和機の室外機は、ビルの屋上や建物の間に設置されるが、室外機から発生する騒音により、近隣住民へ迷惑をかけることがあるため、室外機の低騒音化が求められている。   By the way, outdoor units of air conditioners for buildings and stores are installed on the roofs of buildings and between buildings, but noise generated by the outdoor units may cause inconvenience to neighboring residents. Noise reduction is required.

また、地球温暖化防止のため、空気調和機の省エネ化が求められている。省エネに関しては、室外機の高風量化が有効な手段であるが、高風量化は騒音が増加し、さらに近隣住民へ迷惑をかけることになる。このため、近隣住民への迷惑を抑え、省エネ化を図るために、室外機の低騒音化が重要な要素となっている。当然、ファン入力低減も省エネ化には欠かせない要素となる。   In order to prevent global warming, energy saving of air conditioners is required. In terms of energy saving, increasing the air volume of the outdoor unit is an effective means, but increasing the air volume increases noise and causes inconvenience to neighboring residents. For this reason, reducing the noise of the outdoor unit is an important factor in order to reduce inconvenience to neighboring residents and to save energy. Naturally, reducing fan input is also an indispensable element for energy saving.

また、室外機をビルの屋上に設置する際、クレーン車や、人が階段を登って運ぶよりも、エレベータで搬送するのが容易であるが、エレベータが小さい場合もある。このため、小さなエレベータでも搬送できるよう、室外機の小型化が求められているが、小型化はファン径縮小や熱交換器小型化による通風抵抗増加を伴うため、ファン騒音、入力増加の原因となり易い。   Moreover, when installing an outdoor unit on the rooftop of a building, it is easier to carry by an elevator than a crane car or a person climbs up the stairs, but the elevator may be small. For this reason, downsizing of the outdoor unit is required so that even a small elevator can be transported. However, downsizing is accompanied by an increase in ventilation resistance due to a reduction in the fan diameter and downsizing of the heat exchanger, which causes an increase in fan noise and input. easy.

本発明の技術的課題は、低騒音化を図りながら省エネ化、小型化、ファン入力低減を可能ならしめるようにすることにある。   A technical problem of the present invention is to enable energy saving, downsizing, and fan input reduction while reducing noise.

本発明に係る軸流送風機は、プロペラファンと、プロペラファンを駆動するファンモーターと、ファンモーターを固定するモーター支持部材と、一端が吹出口、他端がプロペラファンの吹出し側外周を覆うベルマウス部として形成された円筒部、及び円筒部よりも断面が大きくこの円筒部の下部が連通接続された箱部、を有するファングリルとを備え、ファングリルの円筒部に、プロペラファンのベルマウス部にて覆われていない部位を覆い箱部内に突出する円筒状のリブを設けたものである。   An axial blower according to the present invention includes a propeller fan, a fan motor that drives the propeller fan, a motor support member that fixes the fan motor, a bell mouth that covers the blower side outer periphery at one end and the other end at the outlet. A fan grille having a cylindrical portion formed as a portion, and a box portion having a larger cross section than the cylindrical portion and a lower portion of the cylindrical portion connected to each other, and the bell mouth portion of the propeller fan on the cylindrical portion of the fan grill A cylindrical rib that covers a portion that is not covered with a protrusion and protrudes into the box portion is provided.

本発明の軸流送風機によれば、一端が吹出口、他端がプロペラファンの吹出し側外周を覆うベルマウス部として形成された円筒部、及び円筒部よりも断面が大きくこの円筒部の下部が連通接続された箱部、を有するファングリルとを備え、ファングリルの円筒部に、プロペラファンのベルマウス部にて覆われていない部位を覆い箱部内に突出する円筒状のリブを設けているので、ファングリルすなわち軸流送風機の軸方向寸法を大きくすることなく、低騒音化を図ることができる。また、これに伴い、省エネ化が図れ、ファン入力低減を可能ならしめることができる。そして、このような軸流送風機を空気調和機の室外機に搭載した場合には、室外機の省エネ化および低騒音化が可能となり、これに伴いファン入力低減を図ることができる。さらに、ファングリルの高さを低くできるため、室外機全体としての小型化が図れる。   According to the axial blower of the present invention, one end is a blower outlet, the other end is a bell mouth part formed as a bell mouth part covering the blower side outer periphery of the propeller fan, and a lower section of the cylindrical part is larger in cross section than the cylindrical part. A fan grille having a box portion that is connected in communication, and a cylindrical rib that covers a portion that is not covered by the bell mouth portion of the propeller fan and that protrudes into the box portion is provided on the cylindrical portion of the fan grille. Therefore, noise reduction can be achieved without increasing the axial dimension of the fan grill, that is, the axial flow fan. As a result, energy saving can be achieved, and fan input can be reduced. When such an axial blower is mounted on an outdoor unit of an air conditioner, it is possible to save energy and reduce noise of the outdoor unit, and accordingly, fan input can be reduced. Further, since the height of the fan grill can be reduced, the overall size of the outdoor unit can be reduced.

本発明の実施の形態1に係る軸流送風機が適用される空気調和機の室外機の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the outdoor unit of the air conditioner to which the axial flow fan which concerns on Embodiment 1 of this invention is applied. 本発明の実施の形態1に係る軸流送風機のファングリルとプロペラファンの関係を示す断面図である。It is sectional drawing which shows the relationship between the fan grill of the axial flow fan which concerns on Embodiment 1 of this invention, and a propeller fan. 従来の軸流送風機のファングリルとプロペラファンの関係を示す断面図である。It is sectional drawing which shows the relationship between the fan grill of the conventional axial flow fan, and a propeller fan. 従来の軸流送風機のファングリルを用いた場合のプロペラファン翼面上の静圧分布を表す図である。It is a figure showing the static pressure distribution on the propeller fan blade surface at the time of using the fan grill of the conventional axial flow fan. 本発明の実施の形態1に係る軸流送風機のファングリルを用いた場合のプロペラファン翼面上の静圧分布を表す図である。It is a figure showing the static pressure distribution on the propeller fan blade surface at the time of using the fan grill of the axial flow fan which concerns on Embodiment 1 of this invention. 軸流送風機の比較例を示す断面図である。It is sectional drawing which shows the comparative example of an axial blower. 本発明の実施の形態1に係る軸流送風機のファングリルの変形例を示す図2相当の断面図である。It is sectional drawing equivalent to FIG. 2 which shows the modification of the fan grill of the axial blower which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る軸流送風機のプロペラファンとモーター支持部材の最短距離の説明図である。It is explanatory drawing of the shortest distance of the propeller fan and motor support member of an axial-flow fan which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る軸流送風機の、(a)は騒音と、プロペラファンとモーター支持部材との最短距離L/ファン径Dの関係を示すグラフ、及び(b)はファン入力と、L/Dの関係を示すグラフである。(A) is a graph which shows the relationship of noise, the shortest distance L / fan diameter D of a propeller fan and a motor support member, and (b) is fan input of the axial flow fan which concerns on Embodiment 1 of this invention. It is a graph which shows the relationship of L / D. プロペラファンの比較例を圧力面側から見た正面図である。It is the front view which looked at the comparative example of the propeller fan from the pressure surface side. 本発明の実施の形態2に係る軸流送風機のプロペラファンを圧力面側から見た正面図である。It is the front view which looked at the propeller fan of the axial-flow fan which concerns on Embodiment 2 of this invention from the pressure surface side. 本発明の実施の形態2に係る軸流送風機のP−Q特性を示すグラフである。It is a graph which shows the PQ characteristic of the axial blower which concerns on Embodiment 2 of this invention. 本発明の実施の形態2に係る軸流送風機を用いた空気調和機の室外機と防雪フードの関係を示す断面図である。It is sectional drawing which shows the relationship between the outdoor unit of the air conditioner using the axial-flow fan which concerns on Embodiment 2 of this invention, and a snow hood. 本発明の実施の形態2に係る軸流送風機のP−Q特性を示すグラフである。It is a graph which shows the PQ characteristic of the axial blower which concerns on Embodiment 2 of this invention. 本発明の実施の形態2に係る軸流送風機のP−Q特性を示すグラフである。It is a graph which shows the PQ characteristic of the axial blower which concerns on Embodiment 2 of this invention. 本発明の実施の形態2に係る軸流送風機のプロペラファンの変形例を圧力面側から示す正面図である。It is a front view which shows the modification of the propeller fan of the axial blower which concerns on Embodiment 2 of this invention from the pressure surface side. 本発明の実施の形態2に係る軸流送風機のプロペラファンの他の変形例を圧力面側から示す正面図である。It is a front view which shows the other modification of the propeller fan of the axial-flow fan which concerns on Embodiment 2 of this invention from the pressure surface side.

実施の形態1.
以下、図示実施の形態により本発明を説明する。
図1は本発明の実施の形態1に係る軸流送風機が適用される空気調和機の室外機の概略構成を示す断面図、図2はその軸流送風機のファングリルとプロペラファンの関係を示す断面図、図3は従来の軸流送風機のファングリルとプロペラファンの関係を示す断面図である。
Embodiment 1 FIG.
The present invention will be described below with reference to illustrated embodiments.
1 is a sectional view showing a schematic configuration of an outdoor unit of an air conditioner to which an axial blower according to Embodiment 1 of the present invention is applied, and FIG. 2 shows a relationship between a fan grill and the propeller fan of the axial blower. FIG. 3 is a sectional view showing the relationship between a fan grill and a propeller fan of a conventional axial fan.

本実施の形態1の軸流送風機20は、ファングリル1と、ファングリル1内に収容されたプロペラファン4と、プロペラファン4の上流側に配置されてモーターシャフト7にプロペラファン4が取り付けられたファンモーター6と、ファンモーター6を固定するモーター支持部材8とを備えている。   The axial blower 20 according to the first embodiment includes a fan grill 1, a propeller fan 4 accommodated in the fan grill 1, and an upstream side of the propeller fan 4. The propeller fan 4 is attached to the motor shaft 7. The fan motor 6 and a motor support member 8 for fixing the fan motor 6 are provided.

ファングリル1は、円筒部1aと、円筒部1aに連通接続され、(水平)断面が略矩形の箱部1bとで形成されている。円筒部1aは、プロペラファン4の吹出し側に垂直に伸びたストレート部と、プロペラファン4の外周の吹出し側の一部を覆い、吸込み側に伸びて外周形状がアール面を有したラッパ形状となったベルマウス部2とから成っており、吹出し口がスリット部3により覆われている。箱部1bは、プロペラファン4の下部及びファンモーター6を覆い、ベルマウス部2と連続するように形成された略矩形の水平の天板を有して、吸込み側に延びて筐体11に接続される箱形状となっている。また、円筒部1aには、図1のようにプロペラファン4のベルマウス部2にて覆われていない部位の羽根の外周を、回転軸方向に沿って略全体を覆うように、箱部1b内に突出する円筒状のリブ12が設けられている。なお、リブ12は、ファングリル1が樹脂製の場合は、モールドにより一体成型することも可能である。   The fan grill 1 is formed by a cylindrical portion 1a and a box portion 1b that is connected to the cylindrical portion 1a and has a (horizontal) cross section that is substantially rectangular. The cylindrical portion 1a includes a straight portion extending perpendicularly to the blowing side of the propeller fan 4, and a trumpet shape covering a part of the blowing side of the outer periphery of the propeller fan 4 and extending to the suction side and having an outer peripheral shape with a rounded surface. The bell mouth part 2 is formed, and the outlet is covered with the slit part 3. The box part 1 b covers the lower part of the propeller fan 4 and the fan motor 6, has a substantially rectangular horizontal top plate formed so as to be continuous with the bell mouth part 2, and extends to the suction side to the housing 11. It has a box shape to be connected. In addition, the cylindrical part 1a has a box part 1b so that the outer periphery of the blades of the part not covered by the bell mouth part 2 of the propeller fan 4 as shown in FIG. A cylindrical rib 12 protruding inward is provided. The ribs 12 can be integrally formed by molding when the fan grill 1 is made of resin.

空気調和機の室外機30は、軸流送風機20を載置した筐体11内に、熱交換器9、圧縮機10、及びアキュームレーター13を収容してなるものである。   The outdoor unit 30 of the air conditioner is configured such that the heat exchanger 9, the compressor 10, and the accumulator 13 are accommodated in a housing 11 in which the axial flow fan 20 is placed.

ベルマウス部2は、図1のようにプロペラファン4の高さ方向全体を覆っていない。高さ方向全体を覆っていない理由は以下の構造上の制約によるものである。
(a)室外機30の高さの小型化のため、ファングリル1の高さを長くできない。
(b)プロペラファン4の運転中にスリット部3に仮に指が入ってもプロペラファン4に指が当たらないよう、スリット部3とプロペラファン4との距離は所定距離確保する必要がある。このため、プロペラファン4とスリット部3間の距離を所定距離より縮めることはできない。
(c)ファングリル1は、箱部1bの側面部5において筐体11とねじ止めすることで固定するようになっており、側面部5の高さはある程度必要である。
The bell mouth portion 2 does not cover the entire height direction of the propeller fan 4 as shown in FIG. The reason for not covering the whole height direction is due to the following structural constraints.
(A) Because of the downsizing of the height of the outdoor unit 30, the height of the fan grill 1 cannot be increased.
(B) It is necessary to secure a predetermined distance between the slit portion 3 and the propeller fan 4 so that the finger does not hit the propeller fan 4 even if a finger enters the slit portion 3 during the operation of the propeller fan 4. For this reason, the distance between the propeller fan 4 and the slit part 3 cannot be shortened from the predetermined distance.
(C) The fan grill 1 is fixed by being screwed to the housing 11 at the side surface portion 5 of the box portion 1b, and the height of the side surface portion 5 is required to some extent.

次に、図3のようにベルマウス部2がプロペラファン4の高さ方向全体を覆っていない従来の場合と、図2のようにベルマウス部2と円筒状のリブ12とによりプロペラファン4の高さ方向全体を覆っている場合において、室外機30の吹出し風量が175m3/minのときの空力性能を下表1に比較して示す。 Next, the conventional case where the bell mouth part 2 does not cover the entire height direction of the propeller fan 4 as shown in FIG. 3, and the propeller fan 4 by the bell mouth part 2 and the cylindrical rib 12 as shown in FIG. Table 1 shows the aerodynamic performance of the outdoor unit 30 when the air flow rate of the outdoor unit 30 is 175 m 3 / min.

Figure 2011202826
Figure 2011202826

表1から明らかなように、ベルマウス部2がプロペラファン4の高さ方向全体を覆っていた方が、騒音値、ファン入力、及び回転数が低くなる。   As apparent from Table 1, the noise value, the fan input, and the rotational speed are lower when the bell mouth portion 2 covers the entire height direction of the propeller fan 4.

次に、その理由について説明する。
図4に図3のベルマウスの場合のプロペラファンの翼面上の静圧分布を、図5に図2のベルマウスの場合のプロペラファンの翼面上の静圧分布を、それぞれ示す。図4及び図5において、圧力面は室外機の上方側を向いている面、負圧面は室外機の下方側を向いている面であり、圧力面の静圧の最も高い点hと、負圧面の静圧の最も低い点lを記載してある。
Next, the reason will be described.
FIG. 4 shows the static pressure distribution on the blade surface of the propeller fan in the case of the bell mouth of FIG. 3, and FIG. 5 shows the static pressure distribution on the blade surface of the propeller fan in the case of the bell mouth of FIG. 4 and 5, the pressure surface is the surface facing the upper side of the outdoor unit, the negative pressure surface is the surface facing the lower side of the outdoor unit, and the point h where the static pressure on the pressure surface is the highest is negative. The point 1 with the lowest static pressure on the pressing surface is indicated.

図4と図5を比較すると、図4の方が点hと点lの位置が近いことがわかる。静圧差により、点hからプロペラファン4とベルマウス部2との隙間を通り、点lへ向かう流れ、すなわち翼端渦が生成されるが、点hと点lの位置が近いほど、翼端渦の渦度は大きくなる。翼端渦は生成した後、隣の翼の前縁へ流入し、騒音、入力増加の原因となる。また、図5のベルマウス部+円筒状のリブの方が長い分、翼端渦にとって流路が狭まるため、翼端渦が生成しにくい。従って、表1に示した空力性能の差は、点hと点lの位置による翼端渦の違いによるものである。   Comparing FIG. 4 and FIG. 5, it can be seen that the positions of point h and point l are closer in FIG. Due to the difference in static pressure, a flow from the point h through the gap between the propeller fan 4 and the bell mouth part 2 toward the point l, that is, a blade tip vortex, is generated. The vorticity of the vortex increases. The tip vortex is generated and then flows into the leading edge of the adjacent wing, causing noise and input increase. Further, since the length of the bell mouth portion + cylindrical rib in FIG. 5 is longer, the flow path is narrowed for the blade tip vortex, so that the blade tip vortex is difficult to be generated. Therefore, the difference in aerodynamic performance shown in Table 1 is due to the difference in blade tip vortex depending on the position of point h and point l.

図6に円筒状のリブ12を設けずにベルマウス部2のみでプロペラファン4の高さ方向全体を覆うようにしたファングリル1の比較例を示す。図6に示すファングリル1の高さ、特に円筒部1aの高さは、ベルマウス部2にてプロペラファンの高さ方向全体を覆うようにした分、図3、図2に示すファングリルよりも高くなっている。   FIG. 6 shows a comparative example of the fan grill 1 in which the entire height direction of the propeller fan 4 is covered only by the bell mouth portion 2 without providing the cylindrical rib 12. The height of the fan grill 1 shown in FIG. 6, particularly the height of the cylindrical portion 1 a is the same as that of the fan grill shown in FIGS. Is also high.

図2のファングリルと、図6のファングリルの場合において、室外機の吹出し風量が175m3/minのときの空力性能を下表2に示す。 In the case of the fan grill of FIG. 2 and the fan grill of FIG. 6, the aerodynamic performance when the blowout air volume of the outdoor unit is 175 m 3 / min is shown in Table 2 below.

Figure 2011202826
Figure 2011202826

表2から明らかなように、図2と図6のファングリルにおいて、空力性能は同等であり、僅かな差は測定ばらつきと考えてよい。このことから、図2のファングリルは、高さを抑えつつ、騒音値、ファン入力を低減できることがわかる。   As is apparent from Table 2, the aerodynamic performances of the fan grills of FIGS. 2 and 6 are the same, and a slight difference may be considered as a measurement variation. From this, it can be seen that the fan grill of FIG. 2 can reduce the noise value and the fan input while suppressing the height.

また、ファングリルを金型で製造している場合は、既存の金型を改造すればリブを設けることができるため、新規に金型を作る必要もない。   In addition, when the fan grill is manufactured with a mold, it is not necessary to make a new mold because the rib can be provided by modifying the existing mold.

一般にベルマウスの上流側は略1/4円弧形状である。図7に図2のベルマウス上流側が略1/4円弧形状となるようにリブ12を設けた例を示す。図7の場合、リブ12の肉厚が厚くなり、ファングリル1が樹脂製の場合、製造工程において肉厚が厚くなったことにより、図2よりも冷却時間を要し、製造工程に要する時間が長くなる場合がある。   Generally, the upstream side of the bell mouth has a substantially ¼ arc shape. FIG. 7 shows an example in which the rib 12 is provided so that the upstream side of the bell mouth in FIG. 2 has a substantially ¼ arc shape. In the case of FIG. 7, when the rib 12 is thick and the fan grill 1 is made of resin, the cooling time is longer than that of FIG. May become longer.

図2のファングリルと図7のファングリルの場合において、室外機の吹出し風量が175m3/minのときの空力性能を下表3に示す。 In the case of the fan grill of FIG. 2 and the fan grill of FIG. 7, the aerodynamic performance when the blowout air volume of the outdoor unit is 175 m 3 / min is shown in Table 3 below.

Figure 2011202826
Figure 2011202826

表3から明らかなように、図7のベルマウスの方が図2のベルマウスよりも騒音、ファン入力は若干低いが、これらは略同等の空力性能を有していることがわかる。   As can be seen from Table 3, the bell mouth of FIG. 7 has slightly lower noise and fan input than the bell mouth of FIG. 2, but these have substantially the same aerodynamic performance.

このように、本実施の形態1に係る軸流送風機によれば、一端に吹出口となるスリット部3が形成されているとともに、他端にプロペラファン4の吹出し側外周を覆うベルマウス部2が形成された円筒部1a、及び円筒部1aよりも断面が大きくこの円筒部1aの下部が連通接続された箱部1b、を有するファングリル1とを備え、ファングリル1の円筒部1aに、プロペラファン4のベルマウス部2にて覆われていない部位を覆い箱部1b内に突出する円筒状のリブ12を設けているので、ファングリル1すなわち軸流送風機20の軸方向寸法を大きくすることなく、低騒音化を図ることができる。また、これに伴い、省エネ化が図れ、ファン入力低減を可能ならしめることができる。そして、このような軸流送風機20を搭載した空気調和機の室外機30は、省エネ化および低騒音化が可能となり、これに伴いファン入力低減を図ることができる。さらに、ファングリル1の高さを低くできるため、室外機30全体としての小型化が図れる。   Thus, according to the axial-flow fan which concerns on this Embodiment 1, while the slit part 3 used as a blower outlet is formed in one end, the bellmouth part 2 which covers the blowing side outer periphery of the propeller fan 4 in the other end And a fan grill 1 having a box section 1b having a larger cross section than that of the cylindrical portion 1a and a lower portion of the cylindrical portion 1a connected to the cylindrical portion 1a. The cylindrical portion 1a of the fan grill 1 includes: Since the cylindrical rib 12 that covers the portion of the propeller fan 4 that is not covered by the bell mouth portion 2 and protrudes into the box portion 1b is provided, the axial dimension of the fan grill 1, that is, the axial fan 20 is increased. Therefore, noise reduction can be achieved. As a result, energy saving can be achieved, and fan input can be reduced. And the outdoor unit 30 of the air conditioner which mounts such an axial blower 20 can achieve energy saving and noise reduction, and accordingly, fan input can be reduced. Furthermore, since the height of the fan grill 1 can be reduced, the overall size of the outdoor unit 30 can be reduced.

図8はプロペラファン4とモーター支持部材8間の最短距離Lを表す図である。最短距離Lが短すぎると、モーター支持部材8から発生した後流渦が、プロペラファン4の前縁に流入し、前縁の流れが乱れるため、ファン騒音、入力増加の原因となる。図2に示したベルマウス部を有するファングリルを用いて、ファン径Dを固定し、最短距離Lを変化させたときの、ファン騒音とL/Dの関係を図9(a)、ファン入力とL/Dの関係を図9(b)に示す。図9(a)より、騒音値はL/D≧0.17で一定となり、図9(b)より、ファン入力はL/D≧0.175で一定となる。すなわち、L/D≧0.175であれば、最短距離Lを長くしても、ファン騒音、入力は変わらなくなる。   FIG. 8 is a diagram showing the shortest distance L between the propeller fan 4 and the motor support member 8. If the shortest distance L is too short, the wake vortex generated from the motor support member 8 flows into the front edge of the propeller fan 4 and the front edge flow is disturbed, which causes fan noise and increased input. FIG. 9A shows the relationship between fan noise and L / D when the fan diameter D is fixed and the shortest distance L is changed using the fan grille having the bell mouth portion shown in FIG. The relationship between L and D / D is shown in FIG. From FIG. 9A, the noise value is constant when L / D ≧ 0.17, and from FIG. 9B, the fan input is constant when L / D ≧ 0.175. That is, if L / D ≧ 0.175, even if the shortest distance L is increased, the fan noise and input do not change.

ちなみに、図3に示した従来のベルマウス部を有するファングリルを用いて、ファン径Dを固定し、最短距離Lを変化させ、同様にファン騒音、入力が変わらなくなるL/Dを求めたところ、L/D=0.22であった。   By the way, using the fan grill having the conventional bell mouth portion shown in FIG. 3, the fan diameter D is fixed, the shortest distance L is changed, and the L / D at which the fan noise and the input are similarly changed is obtained. L / D = 0.22.

従って、図2のベルマウス部を有するファングリルは、図3のベルマウス部を有するファングリルよりも、ファン騒音、入力が変わらなくなる最短距離Lを短くすることができるため、モーター支持部材の設置の自由度を向上することができ、かつ表1よりファン騒音、入力を小さくすることができる。   Therefore, the fan grill having the bell mouth portion of FIG. 2 can shorten the shortest distance L at which the fan noise and the input do not change, compared with the fan grill having the bell mouth portion of FIG. As shown in Table 1, fan noise and input can be reduced.

このように、円筒状のリブ12の内側の領域においてファン径Dのプロペラファン4と、モーター支持部材8との最短距離をLとしたとき、L/D≧0.175とすることにより、ファン騒音、入力が変わらなくなる最短距離Lを短くすることができるため、モーター支持部材8の設置の自由度を向上することができ、かつファン騒音、入力を小さくすることができる。   In this way, when the shortest distance between the propeller fan 4 having the fan diameter D and the motor support member 8 in the region inside the cylindrical rib 12 is L, L / D ≧ 0.175 is satisfied. Since the shortest distance L at which noise and input do not change can be shortened, the degree of freedom of installation of the motor support member 8 can be improved, and fan noise and input can be reduced.

実施の形態2.
図10は比較例であり、一般的なプロペラファンを圧力面側から見た図、図11は本発明の実施の形態2に係る軸流送風機を示すもので、図10のプロペラファンの羽根後縁部の輪郭線が羽根前縁部方向に凹状に形成されたプロペラファンを圧力面側から見た図、図12は図3に示したベルマウスを用い、図10、図11のプロペラファンを使用した場合のP−Q特性を示す。
Embodiment 2. FIG.
FIG. 10 is a comparative example, and is a view of a general propeller fan as seen from the pressure surface side. FIG. 11 shows an axial blower according to Embodiment 2 of the present invention. FIG. 12 is a view of the propeller fan in which the contour line of the edge portion is formed in a concave shape in the direction of the blade leading edge portion, and FIG. 12 is a view of the propeller fan of FIGS. 10 and 11 using the bell mouth shown in FIG. The PQ characteristic when used is shown.

P−Q特性は、プロペラファンの回転数を一定として、通風抵抗である静圧Pと、風量Qの関係を表したものである。通風抵抗が小さいほど風は流れ易くなり、通風抵抗が大きいほど風は流れ難くなる。よって、静圧が小さいほど、風量は大きくなり、静圧が大きいほど風量は小さくなる。なお、これ以降、図12の低風量、高静圧側を締切側(グラフの左上側)、高風量、低静圧側を開放側(グラフの右下側)という。回転数は動作点Aを通る回転数としてある。   The PQ characteristic represents the relationship between the static pressure P, which is the ventilation resistance, and the air volume Q, with the rotation speed of the propeller fan being constant. The smaller the draft resistance, the easier the wind will flow, and the greater the draft resistance, the more difficult the wind will flow. Therefore, the smaller the static pressure, the larger the air volume, and the larger the static pressure, the smaller the air volume. Hereinafter, the low air volume and high static pressure side in FIG. 12 will be referred to as the cutoff side (upper left side of the graph), and the high air volume and low static pressure side will be referred to as the open side (lower right side of the graph). The rotation speed is a rotation speed passing through the operating point A.

図12のP−Q特性から明らかなように、両者を比べると動作点Aより開放側では、図11のプロペラファンの方が回転数が低いにも関わらず、静圧が高いが、締切側では、図11のプロペラファンの方が静圧が低い。つまり、図11の羽根後縁部4bの輪郭線が羽根前縁部4a方向に凹状に形成されたプロペラファン4は、動作点Aにおけるファン入力が図10のプロペラファンより約10%低く、かつ締切側で静圧が低くなる。   As is apparent from the PQ characteristics of FIG. 12, when both are compared, on the open side from the operating point A, the propeller fan of FIG. Then, the propeller fan of FIG. 11 has a lower static pressure. That is, in the propeller fan 4 in which the contour line of the blade trailing edge 4b in FIG. 11 is formed in a concave shape in the direction of the blade leading edge 4a, the fan input at the operating point A is about 10% lower than the propeller fan in FIG. Static pressure decreases on the deadline side.

ところで、豪雪地域で空気調和機が暖房運転される場合、雪の堆積により室外機の吹出し口が塞がれ、風が流れにくくなることがある。これを防止するために、図13のようにファングリル1の吹出口部に防雪フード14を取付けることがある。防雪フードを取付けると、当然、通風抵抗は増加し、動作点は締切側へ移動する。また、防雪フードが必要な場合は、外気温度が低く、室外機の冷媒温度も低くなるため、熱交換器に霜が付きやすく、熱交換器9の通風抵抗が増加するため、さらに動作点は締切側へ移動する。なお、動作点Aは防雪フード14や熱交換器9に霜が付いていない場合の、室外機30の動作点である。   By the way, when the air conditioner is heated in a heavy snow region, the outlet of the outdoor unit may be blocked by the accumulation of snow, making it difficult for the wind to flow. In order to prevent this, a snow hood 14 may be attached to the outlet of the fan grill 1 as shown in FIG. When the snow hood is attached, naturally the draft resistance increases and the operating point moves to the deadline side. In addition, when a snow hood is required, the outside air temperature is low and the refrigerant temperature of the outdoor unit is also low, so that the heat exchanger is easily frosted and the ventilation resistance of the heat exchanger 9 is increased. Move to the deadline. The operating point A is an operating point of the outdoor unit 30 when the snow hood 14 and the heat exchanger 9 are not frosted.

このように、図11の羽根後縁部4bの輪郭線が羽根前縁部4a方向に凹状に形成されたプロペラファン4は、締切側の静圧が低くなる特性があるため、豪雪地域における空気調和機の暖房運転には不向きなプロペラファンである。   Thus, the propeller fan 4 in which the outline of the blade trailing edge 4b of FIG. 11 is formed in a concave shape in the direction of the blade leading edge 4a has a characteristic that the static pressure on the shut-off side is low. It is a propeller fan that is unsuitable for heating operation of a harmonic machine.

図14に図2に示した円筒状のリブを有するベルマウス部を用い、図11に示したプロペラファンを用いた場合のP−Q特性と、図12で示したP−Q特性を併記したものを示す。回転数は動作点Aを通る回転数としてある。図2の円筒状のリブを有するベルマウス部+図11のプロペラファンは、図3の円筒状のリブを有していないベルマウス部+図10のプロペラファンよりも締切側で若干静圧が低いものの、図3の円筒状のリブを有していないベルマウス部+図11のプロペラファンよりは締切側で静圧が高くなっている。動作点Aにおけるファン入力結果を下表4に示す。   FIG. 14 shows the PQ characteristic when the bell mouth portion having the cylindrical rib shown in FIG. 2 is used and the propeller fan shown in FIG. 11 is used, and the PQ characteristic shown in FIG. Show things. The rotation speed is a rotation speed passing through the operating point A. The bell mouth portion having the cylindrical rib of FIG. 2 + the propeller fan of FIG. 11 has a slightly static pressure on the closing side as compared to the bell mouth portion of FIG. 3 having no cylindrical rib + the propeller fan of FIG. Although it is low, the static pressure is higher on the shut-off side than the bell mouth portion without the cylindrical rib of FIG. 3 + the propeller fan of FIG. The fan input result at the operating point A is shown in Table 4 below.

Figure 2011202826
Figure 2011202826

また、図2の円筒状のリブを有するベルマウス部+図11のプロペラファンにおけるP−Q特性の静圧が、全域で図3の円筒状のリブを有していないベルマウス部+図10のプロペラファンにおけるP−Q特性の静圧よりも高くなるよう、図2の円筒状のリブを有するベルマウス部+図11のプロペラファンの回転数を大きくしたときのP−Q特性と、ファン入力結果を図15に示す。   Also, the bell mouth portion having the cylindrical rib of FIG. 2 + the static pressure of the PQ characteristic in the propeller fan of FIG. 11 is the bell mouth portion not having the cylindrical rib of FIG. PQ characteristics when the rotational speed of the bell mouth portion having the cylindrical rib of FIG. 2 and the propeller fan of FIG. 11 is increased so as to be higher than the static pressure of the PQ characteristics of the propeller fan of FIG. The input result is shown in FIG.

表4及び図15から明らかなように、図2の円筒状のリブを有するベルマウス部+図11のプロペラファンは、全域で静圧が高いにも関わらず、ファン入力を低減することができる。   As can be seen from Table 4 and FIG. 15, the bell mouth portion having the cylindrical rib of FIG. 2 and the propeller fan of FIG. 11 can reduce fan input even though the static pressure is high in the entire region. .

このように、本実施の形態2に係る軸流送風機によれば、プロペラファン4の羽根後縁部4bの輪郭線が羽根前縁部4a方向に凹状に形成された形状を有している。また、ファングリル1は、一端に吹出口となるスリット部3が形成されているとともに、他端にプロペラファン4の吹出し側外周を覆うベルマウス部2が形成された円筒部1a、及び円筒部1aよりも断面が大きくこの円筒部1aにベルマウス部2を介して下部が連通接続されているがベルマウスの働きをしない箱部1b、を有している。そして、ファングリルの円筒部1aに、プロペラファンのベルマウス部にて覆われていない部位を覆い箱部1b内に突出する円筒状のリブ12を設けたので、羽根後縁部4bの輪郭線が羽根前縁部4a方向に凹状に形成されたプロペラファンにおいても締切側の静圧低下を抑制でき、かつファン入力を低減することができる。そして、このような軸流送風機20を搭載した空気調和機の室外機30は、省エネ化および低騒音化が可能となり、これに伴いファン入力低減を図ることができる。さらに、ファングリル1の高さを低くできるため、室外機30全体としての小型化が図れる。   Thus, according to the axial blower according to the second embodiment, the outline of the blade trailing edge 4b of the propeller fan 4 has a shape formed in a concave shape in the direction of the blade leading edge 4a. In addition, the fan grill 1 has a cylindrical portion 1a in which a slit portion 3 serving as an air outlet is formed at one end and a bell mouth portion 2 that covers the outer periphery of the blowing side of the propeller fan 4 is formed at the other end. The cylindrical portion 1a has a box portion 1b having a cross section larger than 1a and having a lower portion connected to the cylindrical portion 1a through a bell mouth portion 2 but not functioning as a bell mouth. Since the cylindrical portion 1a of the fan grille is provided with the cylindrical rib 12 that covers the portion not covered by the bell mouth portion of the propeller fan and protrudes into the box portion 1b, the contour line of the blade trailing edge portion 4b However, in the propeller fan formed in a concave shape in the direction of the blade leading edge 4a, it is possible to suppress a decrease in static pressure on the shut-off side and to reduce fan input. And the outdoor unit 30 of the air conditioner which mounts such an axial blower 20 can achieve energy saving and noise reduction, and accordingly, fan input can be reduced. Furthermore, since the height of the fan grill 1 can be reduced, the overall size of the outdoor unit 30 can be reduced.

図16は羽根後縁部4bの輪郭線が羽根前縁部4a方向に凹状に形成され、かつこの凹状部がファン内周側に偏ったプロペラファン4、図17は羽根後縁部4bの輪郭線が羽根前縁部4a方向に凹状に形成され、かつこの凹状部がファン外周側に偏ったプロペラファン4、をそれぞれ示している。   FIG. 16 shows the propeller fan 4 in which the contour line of the blade trailing edge 4b is formed in a concave shape in the direction of the blade leading edge 4a, and the concave portion is biased toward the fan inner peripheral side, and FIG. 17 shows the contour of the blade trailing edge 4b. The propeller fan 4 is shown in which the line is formed in a concave shape in the direction of the blade leading edge 4a, and the concave portion is biased toward the fan outer peripheral side.

図2に示した円筒状のリブを有するベルマウスを用い、図11、図16、図17の、羽根後縁部の輪郭線が羽根前縁部方向に凹状に形成されたプロペラファンにおいて、図12に示した動作点Aにおける比騒音を下表5に示す。
比騒音Ksは下式で定義される。
Ks=SPL−10log10(P・Q2.5
ここで、SPL:ファンから1m離れた位置の騒音値[dB]
P:動作点Aの静圧[mmAq]
Q:動作点Aの風量[m3/min]
FIG. 11, FIG. 16, FIG. 17 shows a propeller fan in which the contour line of the trailing edge of the blade is formed in a concave shape toward the leading edge of the blade, using the bell mouth having the cylindrical rib shown in FIG. 2. The specific noise at the operating point A shown in FIG.
The specific noise Ks is defined by the following equation.
Ks = SPL-10log 10 (P ・ Q 2.5 )
Here, SPL: noise value [dB] at a position 1 m away from the fan
P: Static pressure at operating point A [mmAq]
Q: Air volume at operating point A [m 3 / min]

Figure 2011202826
Figure 2011202826

表5から明らかなように、プロペラファンの羽根後縁部4bの輪郭線が羽根前縁部4a方向に凹状に形成され、かつこの凹状部がファン内周側に偏るほど、比騒音Ksが小さくなる。   As is apparent from Table 5, the specific noise Ks decreases as the contour line of the blade trailing edge 4b of the propeller fan is formed in a concave shape in the direction of the blade leading edge 4a, and the concave portion is biased toward the fan inner peripheral side. Become.

このように、ファングリルが、一端に吹出口となるスリット部3が形成されているとともに、他端にプロペラファン4の吹出し側外周を覆うベルマウス部2が形成された円筒部1a、及び円筒部1aよりも断面が大きくこの円筒部1aにベルマウス部2を介して下部が連通接続された箱部1b、を有している。そして、ファングリルの円筒部1aに、プロペラファンのベルマウス部にて覆われていない部位を覆い箱部1b内に突出する円筒状のリブ12を設け、またプロペラファン4の羽根後縁部4bの輪郭線が羽根前縁部4a方向に凹状に形成され、かつこの凹状部がファン内周側に偏る構成とすることにより、比騒音Ksを小さくすることができる。   As described above, the fan grill has a cylindrical portion 1a in which a slit portion 3 serving as an air outlet is formed at one end, and a bell mouth portion 2 covering the blower side outer periphery of the propeller fan 4 is formed at the other end. It has a box part 1b whose cross section is larger than that of the part 1a and whose lower part is connected to the cylindrical part 1a via a bell mouth part 2. The cylindrical portion 1a of the fan grill is provided with a cylindrical rib 12 that covers a portion that is not covered by the bell mouth portion of the propeller fan and protrudes into the box portion 1b, and the blade trailing edge portion 4b of the propeller fan 4 is provided. Is formed in a concave shape in the direction of the blade leading edge 4a, and the concave portion is biased toward the fan inner peripheral side, whereby the specific noise Ks can be reduced.

図2に示した円筒状のリブを有するベルマウスを用い、図11、図16、図17の、羽根後縁部の輪郭線が羽根前縁部方向に凹状に形成されたプロペラファンにおいて、図12に示した動作点Aにおけるファン効率を下表6に示す。
ファン効率ηは下式で定義される。
η=PQ/W
ここで、P:動作点Aの静圧[Pa]
Q:動作点Aの風量[m3/s]
W:軸出力[W]
FIG. 11, FIG. 16, FIG. 17 shows a propeller fan in which the contour line of the trailing edge of the blade is formed in a concave shape toward the leading edge of the blade, using the bell mouth having the cylindrical rib shown in FIG. 2. The fan efficiency at the operating point A shown in FIG.
The fan efficiency η is defined by the following equation.
η = PQ / W
Where P: static pressure at operating point A [Pa]
Q: flow rate of the operating point A [m 3 / s]
W: Axis output [W]

Figure 2011202826
Figure 2011202826

表6から明らかなように、プロペラファンの羽根後縁部4bの輪郭線が羽根前縁部4a方向に凹状に形成され、かつこの凹状部がファン外周側に偏るほど、ファン効率ηが大きくなる。   As is clear from Table 6, the fan efficiency η increases as the contour line of the blade trailing edge portion 4b of the propeller fan is formed in a concave shape in the direction of the blade leading edge portion 4a and the concave portion is biased toward the fan outer peripheral side. .

このように、ファングリルが、一端に吹出口となるスリット部3が形成されているとともに、他端にプロペラファン4の吹出し側外周を覆うベルマウス部2が形成された円筒部1a、及び円筒部1aよりも断面が大きくこの円筒部1aにベルマウス部2を介して下部が連通接続された箱部1b、を有し、円筒部1aに、プロペラファンのベルマウス部にて覆われていない部位を覆い箱部1b内に突出する円筒状のリブ12を設け、またプロペラファンの羽根後縁部4bの輪郭線が羽根前縁部4a方向に凹状に形成され、かつこの凹状部がファン外周側に偏る構成とすることにより、ファン効率ηを大きくすることができる。   As described above, the fan grill has a cylindrical portion 1a in which a slit portion 3 serving as an air outlet is formed at one end, and a bell mouth portion 2 covering the blower side outer periphery of the propeller fan 4 is formed at the other end. It has a box part 1b whose cross section is larger than that of the part 1a and whose lower part is connected to the cylindrical part 1a via the bell mouth part 2, and is not covered with the bell mouth part of the propeller fan. A cylindrical rib 12 is provided to cover the portion and project into the box portion 1b, and the contour line of the blade trailing edge 4b of the propeller fan is formed in a concave shape in the direction of the blade leading edge 4a. The fan efficiency η can be increased by adopting a configuration biased to the side.

1 ファングリル、1a 円筒部、1b 箱部、2 ベルマウス部、3 スリット部(吹出口)、4 プロペラファン、4a 羽根前縁部、4b 羽根後縁部、6 ファンモーター、8 モーター支持部材、12 円筒状のリブ、20 軸流送風機、30 空気調和機の室外機。   DESCRIPTION OF SYMBOLS 1 Fan grill, 1a Cylindrical part, 1b Box part, 2 Bell mouth part, 3 Slit part (blower), 4 propeller fan, 4a Blade front edge part, 4b Blade rear edge part, 6 Fan motor, 8 Motor support member, 12 outdoor unit of cylindrical rib, 20 axial blower, 30 air conditioner.

Claims (6)

プロペラファンと、
前記プロペラファンを駆動するファンモーターと、
前記ファンモーターを固定するモーター支持部材と、
一端が吹出口、他端が前記プロペラファンの吹出し側外周を覆うベルマウス部として形成された円筒部、及び前記円筒部よりも断面が大きく前記円筒部の下部が連通接続された箱部、を有するファングリルとを備え、
前記ファングリルの前記円筒部に、前記プロペラファンの前記ベルマウス部にて覆われていない部位を覆い前記箱部内に突出する円筒状のリブを設けたことを特徴とする軸流送風機。
With propeller fans,
A fan motor for driving the propeller fan;
A motor support member for fixing the fan motor;
A cylindrical portion formed as a bell mouth portion, one end of which is an outlet, and the other end of which covers the blower side outer periphery of the propeller fan; A fan grill having
An axial blower characterized in that the cylindrical portion of the fan grill is provided with a cylindrical rib that covers a portion of the propeller fan that is not covered by the bell mouth portion and protrudes into the box portion.
前記円筒状のリブの内側の領域における前記プロペラファンのファン径をD、前記プロペラファンと前記モーター支持部材との最短距離をLとしたとき、L/D≧0.175としたことを特徴とする請求項1記載の軸流送風機。   L / D ≧ 0.175, where D is the fan diameter of the propeller fan in the inner region of the cylindrical rib, and L is the shortest distance between the propeller fan and the motor support member. The axial-flow fan according to claim 1. 前記プロペラファンの羽根後縁部の輪郭線が、羽根前縁部方向に凹状に形成されていることを特徴とする請求項1又は請求項2記載の軸流送風機。   The axial flow blower according to claim 1 or 2, wherein a contour line of a blade trailing edge portion of the propeller fan is formed in a concave shape toward the blade leading edge portion. 前記プロペラファンの羽根後縁部の凹状部が、ファン内周側に偏って形成されていることを特徴とする請求項3記載の軸流送風機。   The axial blower according to claim 3, wherein the concave portion of the blade trailing edge of the propeller fan is formed to be biased toward the fan inner peripheral side. 前記プロペラファンの羽根後縁部の凹状部が、ファン外周側に偏って形成されていることを特徴とする請求項3記載の軸流送風機。   The axial blower according to claim 3, wherein a concave portion of a blade trailing edge portion of the propeller fan is formed to be biased toward the fan outer peripheral side. 請求項1乃至請求項5のいずれかに記載の軸流送風機を用いた空気調和機の室外機。   The outdoor unit of the air conditioner using the axial-flow fan in any one of Claims 1 thru | or 5.
JP2010068476A 2010-03-24 2010-03-24 Axial flow fan and outdoor unit of air conditioner using this axial flow fan Expired - Fee Related JP5812572B2 (en)

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KR20180100436A (en) * 2016-02-17 2018-09-10 도시바 캐리어 가부시키가이샤 Indoor unit and air conditioner for air conditioning

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JPH11173605A (en) * 1997-12-11 1999-07-02 Hitachi Ltd Outdoor unit of air conditioner
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JPH10238817A (en) * 1997-02-26 1998-09-08 Daikin Ind Ltd Outdoor machine for air conditioner
JPH11173605A (en) * 1997-12-11 1999-07-02 Hitachi Ltd Outdoor unit of air conditioner
JP2003343489A (en) * 2002-05-30 2003-12-03 Mitsubishi Electric Corp Air blower, controlling method and air cleaner
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JP2007309632A (en) * 2006-04-21 2007-11-29 Hitachi Appliances Inc Outdoor unit for air conditioner, and air conditioner

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180100436A (en) * 2016-02-17 2018-09-10 도시바 캐리어 가부시키가이샤 Indoor unit and air conditioner for air conditioning
KR102230506B1 (en) * 2016-02-17 2021-03-19 도시바 캐리어 가부시키가이샤 Indoor unit and air conditioner for air conditioning

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