JPS61182492A

JPS61182492A - Centrifugal fan

Info

Publication number: JPS61182492A
Application number: JP2190085A
Authority: JP
Inventors: Yoshiaki Aoki; 美昭青木
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 1985-02-08
Filing date: 1985-02-08
Publication date: 1986-08-15

Abstract

PURPOSE: improve strength of a blade, to eliminate any necessity for a reinforcing ring of a fan and further to enable its noise to be reduced to a low level, by forming a section of the blade into a folded shape between a side plate and a main plate while arranging the blade in a side plate side to be displaced from the blade in a main plate side. CONSTITUTION:A fan places a disc-shaped main plate 2 and a truncated cone-shaped side plate 3, forming its center empty, to be opposed, providing a plurality of blades 6 in the periphery of the main plate 2 and the side plate 3. The blade 6, forming its section to be folded into almost two shapes, is divided into a blade piece 6-1 and a blade piece 6-2, securing the blade piece 6-1 to the side plate 3 while the blade piece 6-2 to the main plate 2. The fan arranges the blade 6 to be displaced in the peripheral direction between the side plate 3 and the main plate 2. In this way, the blade 6, being folded, provides strong rigidity, and the fan, eliminating the necessity for a reinforcing ring while reducing processing labor, enables a cost down to be performed. Further the fan, arranging the blade to be displaced between the side plate 3 and the main plate 2, enables a rotating noise to be decreased to a low level by mutually cancelling the noise with the blade piece 6-1 in a side of the side plate 3 and the blade piece 6-2 in a side of the main plate 2 interfering with each other.

Description

【発明の詳細な説明】産業上の利用分野本発明は遠心ファンおよび空調機などの全ての送風ファ
ンに利用するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to all blower fans such as centrifugal fans and air conditioners.

従来の技術従来の遠心ファンを第２ａ図、第２ｂ図により説明する
。円板状の主板０２と円錐台状の側板０３とを対向せし
め、主板０２と側板０３との外周に傾斜した複数の羽根
０１を設け、この羽根Ｏ１の内周に補強リング０４が設
けである。なお０５は駆動軸用ボスである。2. Description of the Related Art A conventional centrifugal fan will be explained with reference to FIGS. 2a and 2b. A disc-shaped main plate 02 and a truncated cone-shaped side plate 03 are opposed to each other, and a plurality of inclined blades 01 are provided on the outer periphery of the main plate 02 and the side plate 03, and a reinforcing ring 04 is provided on the inner periphery of the blade O1. . Note that 05 is a boss for the drive shaft.

発明が解決しようとする問題点このような従来の遠心ファンでは回転音（羽根数×回転
数を基本周波数とする）が発生し騒音が大である。又補
強リング０４は取付けの手間がかかり、コスト高となる
。Problems to be Solved by the Invention These conventional centrifugal fans generate rotational noise (the fundamental frequency is the number of blades multiplied by the number of rotations) and are very noisy. In addition, the reinforcing ring 04 takes time and effort to attach, resulting in high cost.

問題点を解決するための手段本発明は、上記問題点を解決するために、遠心ファンの
羽根を側板と主板との間で、折り曲げ状の断面形状に成
形して、側板側の羽根配列と主板側の羽根配列がずれる
ようにしたのである。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention forms the blades of a centrifugal fan into a bent cross-sectional shape between the side plate and the main plate, and improves the blade arrangement on the side plate side. The arrangement of the blades on the main plate side was made to be misaligned.

実施例本発明を添付図面の実施例により説明する。Example The invention will be explained by way of examples in the accompanying drawings.

第１ａ図、第１ｂ図において、円板状の主板２と中央が
空となった円錐台状の側板３とを対向せしめ、主板２と
側板３との外周に複数の羽根６を設ける。羽根６は断面
路Ｚ形状に折り曲げ、羽根片６−１と羽根片６−２に分
割し、羽根片６−１を側板３に固着し、羽根片６−２を
主板２に固着する。側板３と主板２との間で羽根の円周
方向の配列にずれを生じるようになっている。なお羽根
の折り曲げ方法、形状は２形状に限定するものでない。In FIGS. 1a and 1b, a disc-shaped main plate 2 and a truncated conical side plate 3 with a hollow center are opposed to each other, and a plurality of blades 6 are provided on the outer peripheries of the main plate 2 and side plates 3. The blade 6 is bent into a cross-sectional path Z shape and divided into a blade piece 6-1 and a blade piece 6-2, the blade piece 6-1 is fixed to the side plate 3, and the blade piece 6-2 is fixed to the main plate 2. A deviation occurs in the arrangement of the blades in the circumferential direction between the side plate 3 and the main plate 2. Note that the method of bending the blades and the shape thereof are not limited to two shapes.

又６は駆動軸用ボスである。Further, 6 is a boss for the drive shaft.

作用本発明によれば、羽根を折り曲げたので、剛性が強くな
り、補強リングが不要となった。加工の手間が減り、コ
ストダウンができる。Function According to the present invention, since the blades are bent, the rigidity is increased and a reinforcing ring is not required. Processing time is reduced and costs can be reduced.

又側板３と主板２０間で羽根配列をずらしたことにより
、回転音が側板側の羽根片６−１と主板側の羽根片６−
２とで相互干渉を起し、打ち消し合い、低騒音化ができ
る。Also, by shifting the arrangement of the blades between the side plate 3 and the main plate 20, the rotation noise is caused by the blade pieces 6-1 on the side plate side and the blade pieces 6-1 on the main plate side.
2 cause mutual interference and cancel each other out, making it possible to reduce noise.

発明の効果本発明は１枚の羽根を折り曲げて２枚の羽根片を作った
ので、羽根の強度向上に役立ち３、又騒音防止に役立っ
ている。さらにコストダウンができる。Effects of the Invention In the present invention, one blade is bent to form two blade pieces, which helps improve the strength of the blade and also helps prevent noise. Further cost reduction is possible.

[Brief explanation of the drawing]

第１ａ図は本発明遠心ファンの斜視図、第１ｂ図は羽根
部分の拡大図、第２ａ図は従来の遠心ファンの斜視図、
第２ｂ図は第２ａ図のＪｉｂ−１ｂ断面図である。２・・主板、３・・側板、５・・駆動軸用ボス、６・・
羽根、６−１．６−２・・羽根片。第１ａ図第１ｂ図Fig. 1a is a perspective view of the centrifugal fan of the present invention, Fig. 1b is an enlarged view of the blade portion, Fig. 2a is a perspective view of a conventional centrifugal fan,
FIG. 2b is a sectional view taken along line Jib-1b in FIG. 2a. 2. Main plate, 3. Side plate, 5. Drive shaft boss, 6.
Feather, 6-1.6-2... Feather piece. Figure 1a Figure 1b

Claims

[Claims]

A centrifugal fan in which the blades are formed into a bent cross-sectional shape between the side plate and the main plate so that the blade arrangement on the side plate side and the blade arrangement on the main plate side are misaligned.