JPH08159098A - Bellmouth - Google Patents
BellmouthInfo
- Publication number
- JPH08159098A JPH08159098A JP30055794A JP30055794A JPH08159098A JP H08159098 A JPH08159098 A JP H08159098A JP 30055794 A JP30055794 A JP 30055794A JP 30055794 A JP30055794 A JP 30055794A JP H08159098 A JPH08159098 A JP H08159098A
- Authority
- JP
- Japan
- Prior art keywords
- peripheral wall
- bell mouth
- wall
- hollow
- bellmouth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、空気調和機等に用い
られる送風ファンの送風性能を向上するベルマウスに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bell mouth for improving the blowing performance of a blowing fan used in an air conditioner or the like.
【０００２】[0002]
【従来の技術】従来、空気調和機において、熱交換器を
冷却のための送風ファンの送風性能を向上するため、送
風ファンの外周縁を囲む合成樹脂製のベルマウスを設け
ている。このベルマウス１は、図２(A)〜(C)に示すよう
に、送風ファン２を内周に配置する略円筒形状の周壁１
aを有し、この略円筒形状の周壁１aの内周面１bと送風
ファン２の外周縁２ａとの間に一定の間隔ｔ１を確保し
ている。2. Description of the Related Art Conventionally, in an air conditioner, in order to improve the blowing performance of a blower fan for cooling a heat exchanger, a bell mouth made of synthetic resin is provided to surround the outer peripheral edge of the blower fan. As shown in FIGS. 2 (A) to 2 (C), this bell mouth 1 has a substantially cylindrical peripheral wall 1 in which a blower fan 2 is arranged on the inner periphery.
and a constant gap t1 is secured between the inner peripheral surface 1b of the substantially cylindrical peripheral wall 1a and the outer peripheral edge 2a of the blower fan 2.
【０００３】上記ベルマウス１は、周壁１aの内周面１b
の大径部の直径Ｄ1が４５０mm、小径部の直径Ｄ2が４１
０mm、幅Ｗが６０mm程度の大きさのものでも、周壁１a
の肉厚ｔ２が２〜３mm程度に非常に薄く形成している。
このため、上記周壁１aを補強するために、周壁１aの軸
方向の両端部１c,１dの肉厚ｔ３,ｔ４を５mm程度に厚く
すると共に、周壁１aの外周面１gに周方向に等間隔（図
２では４等分）に肉厚ｔ５が５mm程度の補強リブ１e,
…,１eを形成している。The bell mouth 1 has an inner peripheral surface 1b of a peripheral wall 1a.
The diameter D 1 of the large diameter part is 450 mm and the diameter D 2 of the small diameter part is 41
Even if the size is 0 mm and the width W is about 60 mm, the peripheral wall 1a
The thickness t2 is very thin, about 2 to 3 mm.
Therefore, in order to reinforce the peripheral wall 1a, the wall thicknesses t3 and t4 of both axial end portions 1c and 1d of the peripheral wall 1a are increased to about 5 mm, and the outer peripheral surface 1g of the peripheral wall 1a is equally spaced in the circumferential direction ( The reinforcing rib 1e having a wall thickness t5 of about 5 mm is divided into four equal parts in FIG.
..., forming 1e.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記ベ
ルマウス１は、周壁１aの肉厚ｔ２が薄いのに対して、
両端部１c,１dの肉厚ｔ３,ｔ４および補強リブ１eの肉
厚ｔ５が厚いから、肉厚の不均一により成形後に「ひ
け」が生じて周壁１aが歪み、周壁１aの内周面１bと送
風ファン２の外周縁２ａとの間の隙間ｔ１が一定でなく
なり、騒音が発生したり、送風性能が悪化するという問
題がある。However, in the bell mouth 1 described above, while the wall thickness t2 of the peripheral wall 1a is thin,
Since the wall thicknesses t3, t4 of the both end portions 1c, 1d and the wall thickness t5 of the reinforcing rib 1e are large, "sinker" is generated after molding due to the uneven thickness, and the peripheral wall 1a is distorted and the inner peripheral surface 1b of the peripheral wall 1a is deformed. The gap t1 between the blower fan 2 and the outer peripheral edge 2a is not constant, which causes problems such as noise generation and deterioration of the blowing performance.
【０００５】また、上記周壁１aの歪みを防ぐために、
剛性の高い材料を用いるか、両端部１c,１dの肉厚を厚
くすると、コストが高くなると共に、ベルマウスの形状
が大きくなるという問題がある。In order to prevent the distortion of the peripheral wall 1a,
If a material having high rigidity is used or the wall thickness of both end portions 1c and 1d is increased, the cost becomes high and the shape of the bell mouth becomes large.
【０００６】そこで、この発明の目的は、周壁の歪を抑
制して、騒音の発生を防止できると共に、送風性能を向
上できる送風ファンのベルマウスを提供することにあ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a bell fan for a blower fan which can suppress the distortion of the peripheral wall, prevent the generation of noise and improve the blowing performance.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、請求項１のベルマウスは、内周に送風ファンを配置
するための略円筒形状の周壁を有する合成樹脂製のベル
マウスにおいて、上記周壁の少なくとも一方の端部内に
中空成形により中空部を形成したことを特徴としてい
る。In order to achieve the above object, the bell mouth of claim 1 is a bell mouth made of synthetic resin having a substantially cylindrical peripheral wall for disposing a blower fan on the inner periphery thereof. A hollow portion is formed in at least one end of the peripheral wall by hollow molding.
【０００８】また、請求項２のベルマウスは、請求項１
のベルマウスにおいて、上記周壁の外周に、中空成形に
より内部に中空部が形成された補強リブを設けたことを
特徴としている。The bell mouth according to claim 2 is the bell mouth according to claim 1.
The bell mouth of the present invention is characterized in that a reinforcing rib having a hollow portion inside is formed by hollow molding on the outer periphery of the peripheral wall.
【０００９】[0009]
【作用】上記請求項１のベルマウスによれば、ベルマウ
スの周壁の少なくとも一方の端部内に、ガスインジェク
ション等の中空成形により中空部を形成する。これによ
り、上記周壁の少なくとも一方の端部の肉厚を略均一化
できるから、成形後に「ひけ」が生じにくくなって周壁
の歪みを抑制でき、周壁の内周面と送風ファンの外周縁
との間の隙間を一定に維持できるので、騒音の発生を防
止できると共に、送風性能を向上できる。According to the bell mouth of claim 1, a hollow portion is formed in at least one end portion of the peripheral wall of the bell mouth by hollow molding such as gas injection. As a result, since the wall thickness of at least one end of the peripheral wall can be made substantially uniform, "sinking" is less likely to occur after molding, distortion of the peripheral wall can be suppressed, and the inner peripheral surface of the peripheral wall and the outer peripheral edge of the blower fan can be suppressed. Since the gap between them can be maintained constant, the generation of noise can be prevented and the blowing performance can be improved.
【００１０】上記請求項２のベルマウスによれば、請求
項１のベルマウスにおいて、上記ベルマウスの周壁の外
周に、中空成形により内部に中空部が形成された補強リ
ブを設けたので、上記周壁の剛性を補強すると共に、周
壁の補強リブの箇所も肉厚を略均一にできるので、成形
後に「ひけ」が生じにくくなって周壁の歪みを未然に抑
制できる。According to the bell mouth of the above-mentioned claim 2, in the bell mouth of the above-mentioned claim 1, since a reinforcing rib having a hollow portion formed therein by hollow molding is provided on the outer periphery of the peripheral wall of the bell mouth, Since the rigidity of the peripheral wall can be reinforced and the thickness of the reinforcing ribs of the peripheral wall can be made substantially uniform, the sink marks are less likely to occur after molding, and the distortion of the peripheral wall can be suppressed.
【００１１】[0011]
【実施例】以下、この発明のベルマウスを一実施例によ
り詳細に説明する。EXAMPLES The bell mouth of the present invention will be described in detail below with reference to examples.
【００１２】図１(A)〜(C)はこの発明のベルマウス１の
各部の断面図を示し、後述する中空部１１,１２,１３以
外は図２(A)に示すベルマウスと同一の構成をしてお
り、同一構成部は同一参照番号を付して説明を省略す
る。1 (A) to 1 (C) are sectional views of respective parts of a bell mouth 1 of the present invention, which are the same as the bell mouth shown in FIG. 2 (A) except for hollow portions 11, 12 and 13 which will be described later. The same components are given the same reference numerals and the description thereof will be omitted.
【００１３】図１(A)は、合成樹脂製のベルマウス１の
周壁１aの一方の端部１cの図２(A)におけるＡ−Ａ線か
ら見た要部拡大断面図である。FIG. 1 (A) is an enlarged cross-sectional view of one end 1c of the peripheral wall 1a of the bell mouth 1 made of synthetic resin as seen from the line AA in FIG. 2 (A).
【００１４】上記ベルマウス１を成形する場合、ベルマ
ウス１の周壁１aの一方の端部１cの内部には、ガスイン
ジェクション等の中空成形によって、周壁１aの全周に
わたって環状の中空部１１を形成して肉抜きをしてい
る。このため、上記周壁１aの一方の端部１cの外側の肉
厚ｔ３は５mm程度と従来と変わらないが、肉抜きした中
空部１１によって、中空部１１の内面と端部１cの外周
面との間の肉厚ｔ６が２〜３mm程度となり、周壁１aの
肉厚ｔ２に近い値となる。なお、上記中空部１１の内面
と端部１cの内周面１bとの間の肉厚も２〜３mm程度とな
る。When the bell mouth 1 is molded, an annular hollow portion 11 is formed inside the one end portion 1c of the peripheral wall 1a of the bell mouth 1 by gas injection molding or the like over the entire circumference of the peripheral wall 1a. I am leaning out. Therefore, the outer wall thickness t3 of the one end 1c of the peripheral wall 1a is about 5 mm, which is the same as the conventional one, but the hollowed-out hollow portion 11 allows the inner surface of the hollow portion 11 and the outer peripheral surface of the end portion 1c to be separated from each other. The wall thickness t6 between them is about 2 to 3 mm, which is close to the wall thickness t2 of the peripheral wall 1a. The wall thickness between the inner surface of the hollow portion 11 and the inner peripheral surface 1b of the end portion 1c is also about 2 to 3 mm.
【００１５】また、図１(B)は、上記ベルマウス１の周
壁１aの他方の端部１dの図２(A)におけるＡ−Ａ線から
見た要部拡大断面図である。FIG. 1 (B) is an enlarged cross-sectional view of the other end 1d of the peripheral wall 1a of the bell mouth 1 viewed from the line AA in FIG. 2 (A).
【００１６】上記ベルマウス１の周壁１aの他方の端部
１dの内部には、上記一方の端部１cと同様に、ベルマウ
ス１を成形するときにガスインジェクション等の中空成
形によって、周壁１aの全周にわたって環状の中空部１
２を形成して肉抜きをしている。このため、上記周壁１
aの他方の端部１dの外側の肉厚ｔ４は５mm程度と従来と
変わらないが、肉抜きした中空部１２によって、中空部
１２の内面と端部１dの外周面との間の肉厚ｔ７が２〜
３mm程度となり、周壁１aの肉厚ｔ２に近い値となる。
なお、上記中空部１２の内面と端部１dの内周面１bとの
間の肉厚も２〜３mm程度となる。Inside the other end 1d of the peripheral wall 1a of the bell mouth 1, as in the case of the one end 1c, the peripheral wall 1a of the peripheral wall 1a is formed by hollow molding such as gas injection when molding the bell mouth 1. Hollow part 1 that is annular around the entire circumference
2 is formed and the meat is removed. Therefore, the peripheral wall 1
The thickness t4 on the outer side of the other end 1d of a is about 5 mm, which is the same as the conventional one, but the hollowed-out hollow portion 12 allows the thickness t7 between the inner surface of the hollow portion 12 and the outer peripheral surface of the end 1d. Is 2
It is about 3 mm, which is a value close to the wall thickness t2 of the peripheral wall 1a.
The wall thickness between the inner surface of the hollow portion 12 and the inner peripheral surface 1b of the end portion 1d is also about 2 to 3 mm.
【００１７】また、図１(C)は、上記ベルマウス１の周
壁１aの各補強リブ１eの図２(A)におけるＢ−Ｂ線から
みた拡大断面図である。FIG. 1 (C) is an enlarged sectional view of each reinforcing rib 1e of the peripheral wall 1a of the bell mouth 1 as seen from the line BB in FIG. 2 (A).
【００１８】上記ベルマウス１の各補強リブ１eの内部
には、上記周壁１aの一方の端部１cと同様に、ベルマウ
ス１を成形するときにガスインジェクション等の中空成
形によって、補強リブ１eの略全長にわたって略直線状
の中空部１３を形成して肉抜きをしている。このため、
上記周壁１aの各補強リブ１eは、外面の肉厚ｔ５は５mm
程度と従来と変わらないが、肉抜きした中空部１３によ
って、中空部１３の内面と補強リブ１eの外周面との間
の肉厚ｔ８が２〜３mm程度となり、周壁１aの肉厚ｔ２
に近い値となる。なお、上記中空部１３の内面と周壁１
aの内周面１bとの間の肉厚も２〜３mm程度となる。Inside each of the reinforcing ribs 1e of the bell mouth 1, like the one end 1c of the peripheral wall 1a, the reinforcing ribs 1e are formed by hollow molding such as gas injection when molding the bell mouth 1. The hollow portion 13 having a substantially linear shape is formed over substantially the entire length to remove the meat. For this reason,
Each reinforcing rib 1e of the peripheral wall 1a has an outer wall thickness t5 of 5 mm.
The thickness t8 between the inner surface of the hollow portion 13 and the outer peripheral surface of the reinforcing rib 1e is about 2 to 3 mm due to the hollowed-out hollow portion 13 and the wall thickness t2 of the peripheral wall 1a is the same as the conventional one.
It is a value close to. The inner surface of the hollow portion 13 and the peripheral wall 1
The wall thickness between a and the inner peripheral surface 1b is also about 2 to 3 mm.
【００１９】上記構成のベルマウス１によれば、周壁１
aの両端部１c,１d内と各補強リブ１e内に、中空部１１,
１２,１３を夫々形成することによって、周壁１aの両端
部１c,１dと各補強リブ１eの肉厚は、周壁１aの肉厚ｔ
２に近い値となるので、肉厚を略均一化することができ
る。According to the bell mouth 1 having the above structure, the peripheral wall 1
A hollow part 11, a is formed in each end 1c, 1d of a and each reinforcing rib 1e.
By forming 12 and 13, respectively, the wall thicknesses of the end portions 1c and 1d of the peripheral wall 1a and the reinforcing ribs 1e are equal to the wall thickness t of the peripheral wall 1a.
Since the value is close to 2, the wall thickness can be made substantially uniform.
【００２０】したがって、ベルマウス１の成形後に「ひ
け」が生じにくくなって周壁１aの歪みを未然に抑制で
き、周壁１aの内周面１bと送風ファン２の外周縁２ａと
の間の隙間ｔ１を一定に維持することができる。したが
って、上記周壁１aの内周面１bと送風ファン２の外周縁
２ａとの間のクリアランス精度を確保することによっ
て、騒音の発生を防止できると共に、送風性能を向上す
ることができる。Therefore, after the bell mouth 1 is molded, a sink mark is less likely to occur, and the distortion of the peripheral wall 1a can be suppressed in advance, and the gap t1 between the inner peripheral surface 1b of the peripheral wall 1a and the outer peripheral edge 2a of the blower fan 2 can be reduced. Can be kept constant. Therefore, by ensuring the accuracy of the clearance between the inner peripheral surface 1b of the peripheral wall 1a and the outer peripheral edge 2a of the blower fan 2, it is possible to prevent noise from occurring and improve the blowing performance.
【００２１】上記実施例では、ベルマウス１の周壁１a
の両端部１c,１dに環状の中空部１１,１２を夫々形成し
たが、周壁の少なくとも一方の端部に中空部を形成すれ
ばよい。また、上記中空部の形状は環状に限らないのは
勿論である。In the above embodiment, the peripheral wall 1a of the bell mouth 1 is
Although the annular hollow portions 11 and 12 are formed at both end portions 1c and 1d, respectively, the hollow portions may be formed at at least one end portion of the peripheral wall. Further, it goes without saying that the shape of the hollow portion is not limited to the annular shape.
【００２２】また、上記ベルマウス１の周壁１aの外周
に、内部に中空部１３が形成された複数の補強リブ１e
を設けたが、内部に中空部を形成した補強リブはなくと
もよい。Further, a plurality of reinforcing ribs 1e having a hollow portion 13 formed therein are formed on the outer periphery of the peripheral wall 1a of the bell mouth 1.
However, the reinforcing rib having the hollow portion therein may be omitted.
【００２３】[0023]
【発明の効果】以上より明らかなように、請求項１の発
明のベルマウスは、ベルマウスの周壁の少なくとも一方
の端部内に、ガスインジェクション等の中空成形により
中空部を形成したから、周壁の端部の肉厚を略均一化し
て、成形後に「ひけ」が生じるのを防ぐと共に、周壁の
歪みを未然に抑制することができる。したがって、剛性
の低い材料を用いて、周壁の剛性を高めつつ、周壁の内
周面と送風ファンの外周縁との間のクリアランス精度を
確保できるので、騒音の発生を防止できると共に、送風
性能を向上することができる。As is clear from the above, the bell mouth of the invention of claim 1 has a hollow portion formed by hollow molding such as gas injection in at least one end portion of the peripheral wall of the bell mouth. By making the thicknesses of the end portions substantially uniform, it is possible to prevent "sinks" from occurring after molding, and to suppress distortion of the peripheral wall. Therefore, by using a material having low rigidity, it is possible to increase the rigidity of the peripheral wall and to ensure the clearance accuracy between the inner peripheral surface of the peripheral wall and the outer peripheral edge of the blower fan, so that it is possible to prevent noise generation and improve the blowing performance. Can be improved.
【００２４】また、請求項２の発明のベルマウスは、請
求項１のベルマウスにおいて、上記周壁の外周に、中空
成形により内部に中空部が形成された補強リブを設けた
ので、周壁の補強リブの箇所も肉厚を略均一にして、成
形後に「ひけ」が生じるのを防ぐので、周壁を補強する
と共に、補強リブ近傍の周壁の歪みを抑制することがで
きる。The bell mouth according to the invention of claim 2 is the bell mouth according to claim 1, wherein the outer periphery of the peripheral wall is provided with a reinforcing rib having a hollow portion formed therein by hollow molding. The ribs also have a substantially uniform wall thickness to prevent "sinker" from occurring after molding, so that the peripheral wall can be reinforced and the distortion of the peripheral wall in the vicinity of the reinforcing rib can be suppressed.
【図１】 図１(A)はこの発明の一実施例のベルマウス
の図２(A)におけるＡ−Ａ線の要部拡大断面図であり、
図１(B)は図２(A)におけるＡ−Ａ線の要部拡大断面図で
あり、図１(C)は図２(A)におけるＢ−Ｂ線の拡大断面図
である。FIG. 1 (A) is an enlarged cross-sectional view of a main part of a bell mouth of FIG. 2 (A) of a bell mouth according to an embodiment of the present invention,
1B is an enlarged cross-sectional view of a main part taken along the line AA in FIG. 2A, and FIG. 1C is an enlarged cross-sectional view taken along the line BB of FIG. 2A.
【図２】 図２(A)は従来のベルマウスの正面図であ
り、図２(B)は図２(A)のＡ−Ａ線の断面図であり、図２
(C)は図２(A)のＢ−Ｂ線の断面図である。2 (A) is a front view of a conventional bell mouth, FIG. 2 (B) is a sectional view taken along the line AA of FIG. 2 (A), and FIG.
2C is a cross-sectional view taken along the line BB of FIG.
１…ベルマウス、１a…周壁、１b…内周面、１c,１d…
端部、１e…補強リブ、１g…外周面、１１,１２,１３…
中空部、２…送風ファン、２ａ…外周縁。1 ... Bellmouth, 1a ... Peripheral wall, 1b ... Inner peripheral surface, 1c, 1d ...
Ends, 1e ... Reinforcing ribs, 1g ... Outer peripheral surface, 11, 12, 13 ...
Hollow part, 2 ... Blower fan, 2a ... Outer peripheral edge.
Claims (2)
略円筒形状の周壁(１a)を有する合成樹脂製のベルマウ
スにおいて、 上記周壁(１a)の少なくとも一方の端部(１c,１d)内に中
空成形により中空部(１１,１２)を形成したことを特徴
とするベルマウス。1. A bell mouth made of synthetic resin having a substantially cylindrical peripheral wall (1a) for arranging a blower fan (2) on the inner periphery thereof, wherein at least one end portion (1c, 1c) of the peripheral wall (1a) is provided. A bell mouth, characterized in that a hollow part (11, 12) is formed by hollow molding in 1d).
壁(１a)の外周に、中空成形により内部に中空部(１３)
が形成された補強リブ(１e)を設けたことを特徴とする
ベルマウス。2. The bell mouth according to claim 1, wherein a hollow portion (13) is formed inside the peripheral wall (1a) by hollow molding.
A bell mouth, comprising a reinforcing rib (1e) formed with
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30055794A JPH08159098A (en) | 1994-12-05 | 1994-12-05 | Bellmouth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30055794A JPH08159098A (en) | 1994-12-05 | 1994-12-05 | Bellmouth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08159098A true JPH08159098A (en) | 1996-06-18 |
Family
ID=17886271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30055794A Pending JPH08159098A (en) | 1994-12-05 | 1994-12-05 | Bellmouth |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08159098A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006118722A (en) * | 2004-10-19 | 2006-05-11 | Hitachi Ltd | Outdoor unit for air conditioner |
| EP3557145A4 (en) * | 2016-12-19 | 2019-12-11 | Mitsubishi Electric Corporation | Air conditioning device |
-
1994
- 1994-12-05 JP JP30055794A patent/JPH08159098A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006118722A (en) * | 2004-10-19 | 2006-05-11 | Hitachi Ltd | Outdoor unit for air conditioner |
| JP4521867B2 (en) * | 2004-10-19 | 2010-08-11 | 日立アプライアンス株式会社 | Air conditioner outdoor unit |
| EP3557145A4 (en) * | 2016-12-19 | 2019-12-11 | Mitsubishi Electric Corporation | Air conditioning device |
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