JPH01151800A

JPH01151800A - Ring fan

Info

Publication number: JPH01151800A
Application number: JP30897787A
Authority: JP
Inventors: Yoshiko Fujii; 淑子藤井
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-12-07
Filing date: 1987-12-07
Publication date: 1989-06-14

Abstract

PURPOSE:To improve performance and to reduce noise, in a cooling fan, by providing a rotor blade rotatable together with the entirety or a part of duct forming outer walls. CONSTITUTION:A fan rotor blade 14 is rotated together with the entirety or a part of a duct 13 forming outer wall. A part of the duct is rotated when the duct is excessively long or when a static blade is provided in order to realize inner diameter side fan characteristic even at the tip section thereof. Since function in the vicinity of the tip section of the rotor blade of a high speed fan is recovered, performance of fan can be improved for same rotation. Consequently, noise can also be reduced.

Description

【発明の詳細な説明】［産業上の利用分野］換気扇、扇風機、各種機器の冷却用ファンなど日常生活
や産業界で大、小のファンが利用されており、これらの
−層の性能向上と低騒音化に本発明は利用される。[Detailed Description of the Invention] [Field of Industrial Application] Large and small fans are used in daily life and industry, such as ventilation fans, electric fans, and fans for cooling various devices. The present invention is utilized to reduce noise.

［従来の技術］今日、一般に広く使われているファンにおいては、第１
図のように外壁を形成するダクトは静止しており、ダク
トの外壁とファン動翼先端との間に隙間を有する。この
ため、ファン動翼の後方で上昇した静圧によって前方へ
逆流が生じ、ファン性能を著しく害している。第２図に
典型的な測定例を示すが、ファン先端から内径側への広
い領域で、適切な風速分布を有していない。[Prior art] In the fans widely used today, the first
As shown in the figure, the duct forming the outer wall is stationary, and there is a gap between the outer wall of the duct and the tip of the fan rotor blade. As a result, the increased static pressure behind the fan rotor blades causes a backflow to the front, significantly impairing fan performance. A typical measurement example is shown in FIG. 2, which does not have an appropriate wind speed distribution in a wide area from the tip of the fan to the inner diameter side.

［発明が解決しようとする問題点と手段］第２図にみた
ように、動翼スパンの中間から内径側にかけてはファン
として有効な働きをしていることに注目する。この内径
側の特性を先端部分でも実現させたい、そのためには第
３図のごとく、外壁ダクトを動翼とともに回転させれば
内径側と同じような条件が成立する。ダクトが長過ぎた
り、静翼を有するときは、第４図のようにダクトの一部
分を回転させる。[Problems and Means to be Solved by the Invention] As shown in Fig. 2, it is noted that the area from the middle of the rotor blade span to the inner diameter side functions effectively as a fan. We would like to achieve this characteristic on the inner diameter side also at the tip.To achieve this, as shown in Figure 3, if the outer wall duct is rotated together with the rotor blades, the same conditions as on the inner diameter side will be established. If the duct is too long or has stationary vanes, rotate a portion of the duct as shown in Figure 4.

［発明による効果コ周速の速いファン動翼の先端部付近の機能を回復させる
ことにＩより９回転数を同じにしたままで、性能向上が
はかれる。このことは、従来型より少ない回転数で所望
の性能が得られることを意味し、ｓｉ音低減につながる
。[Effects of the Invention] By restoring the function near the tip of the fan rotor blade, which has a high circumferential speed, the performance can be improved while keeping the rotation speed the same. This means that the desired performance can be obtained with a lower rotational speed than the conventional type, leading to a reduction in si noise.

第２図８．逆　流　域９、風速分布１０、動翼先端側１１、内径壁側１２、中心軸第３図１３、回転ダクト１４、ファン動翼１５、内　径　壁　　　　汐２斜線は回転部１６、モー
　タ１７、支持棒１８、中心軸手続補正前′７ベ）Figure 2 8. Reverse flow area 9, wind speed distribution 10, rotor blade tip side 11, inner diameter wall side 12, center axis (Fig. 3), rotating duct 14, fan rotor blades 15, inner diameter wall 2 Diagonal lines indicate rotating part 16, motor 17 , support rod 18, center axis procedure before correction '7be)

Claims

[Claims]

together with all or part of the duct forming the outer wall;
A fan characterized by having rotating blades.