JPS61232400A - Motor-driven fan - Google Patents

Motor-driven fan

Info

Publication number
JPS61232400A
JPS61232400A JP7296485A JP7296485A JPS61232400A JP S61232400 A JPS61232400 A JP S61232400A JP 7296485 A JP7296485 A JP 7296485A JP 7296485 A JP7296485 A JP 7296485A JP S61232400 A JPS61232400 A JP S61232400A
Authority
JP
Japan
Prior art keywords
air guide
diffuser
motor
impeller
small holes
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.)
Granted
Application number
JP7296485A
Other languages
Japanese (ja)
Other versions
JPH0641759B2 (en
Inventor
Kiminori Kato
公軌 加藤
Toru Hirose
徹 広瀬
Izumi Yamaura
泉 山浦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP60072964A priority Critical patent/JPH0641759B2/en
Publication of JPS61232400A publication Critical patent/JPS61232400A/en
Publication of JPH0641759B2 publication Critical patent/JPH0641759B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To decrease the noise, by forming small holes along the shaft's direction, in the diffuser of air guide of a centrifugal fan. CONSTITUTION:The diffuser 19 of air guide 17 of a centrifugal fan and the casing 14 of this fan are brought in contact with each other, at almost the middle part between the diffuser 19 and a return passage 21. Grooves 22' are formed along the shaft's direction, in the diffuser 19 of the air guide 17, and small holes 22 are shaped by said grooves 22' and the casing 14. Consequently, NZ (the product of the number of vanes of the impeller and the rotational speed) noise generated by the motor-driven fan can be decreased, because the NZ noise is absorbed by said small holes 22, and the constitution of this fan can be simplified.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は真空掃除機に使用する電動送風機に関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric blower for use in a vacuum cleaner.

従来の技術 従来のこの種の電動送風機は、例えば特公昭52−49
168号公報に示されている。
2. Description of the Related Art A conventional electric blower of this type is, for example, manufactured by Japanese Patent Publication No. 52-49
This is shown in Publication No. 168.

すなわち、第4図の様にケーシング1の中にインペラ2
、エアガイド3を設けて、モーター4によジインペラ2
を高速回転させて、風量と真空圧を得るようになってい
る。
That is, as shown in Fig. 4, the impeller 2 is placed inside the casing 1.
, an air guide 3 is provided, and a di-impeller 2 is connected to the motor 4.
is rotated at high speed to obtain air volume and vacuum pressure.

発明が解決しようとする問題点 上記電動送風機のように、エアガイド3をインペラ2の
外周に設ける構造のものでは、インペラ2から吐出され
た気流がエアガイド3内に流入する際、エアガイド入口
で衝突することに起因すると考えられる騒音が問題とな
っていた。これはインペラ2の羽根枚数Zと、インペラ
2の回転数N(r、p、m)の積で発生し、通称NZ音
と呼ばれている。
Problems to be Solved by the Invention When the air guide 3 is provided on the outer periphery of the impeller 2 like the electric blower described above, when the airflow discharged from the impeller 2 flows into the air guide 3, the air guide inlet The noise thought to be caused by collisions was a problem. This occurs as a product of the number of blades Z of the impeller 2 and the rotation speed N (r, p, m) of the impeller 2, and is commonly called NZ sound.

本発明はこのような問題点をエアーガイドを改良する事
により解決するものである。
The present invention solves these problems by improving the air guide.

問題点を解決するだめの手段 上記問題点を解決するだめの本発明の基本的な手段は、
エアーガイドのディフューザに軸方向の小孔を形成する
ことにより前述したNZ音を低減するものである。
Means for solving the problems The basic means of the present invention for solving the above problems are as follows:
By forming small holes in the axial direction in the diffuser of the air guide, the above-mentioned NZ noise is reduced.

作  用 この技術的手段は次のように作用する。すなわち、ディ
フューザに軸方向の小孔を設けることによp、NZ騒音
がこの小孔により吸音され、従って電動送風機のNZ騒
音が低減される。
Effect This technical means works as follows. That is, by providing the diffuser with small holes in the axial direction, p, NZ noise is absorbed by the small holes, and therefore the NZ noise of the electric blower is reduced.

実施例 以下、本発明の一実施例について添付図面にもとづいて
説明する。
EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

第1図〜第3図において1,11は駆動用のモーターで
あり、このモーターフレーム12には中央に吸気孔13
を有したケーシング14が嵌着されている。16はこの
ケーシング14に内包された、複数枚の羽根16を有し
た遠心形のインペラであシ、モーター軸18に取付けら
れていてモーター11により駆動される。17はインペ
ラ16とモーターフレーム12との間に設けられたエア
ーガイドで、複数のディフューザ19と戻り通路21と
を有し、ケーシング14に内包されている。インペラ1
6より送出された気流は、外周に向って拡大した通路を
有するディフューザ19により案内され、ディフューザ
19の終端に滑らかに独立し連通してモーター吸気孔2
0に気流を導く戻り通路21に流入するものである。
1 to 3, reference numerals 1 and 11 are drive motors, and this motor frame 12 has an intake hole 13 in the center.
A casing 14 having a diameter is fitted therein. A centrifugal impeller 16 is housed in the casing 14 and has a plurality of blades 16. The impeller 16 is attached to a motor shaft 18 and driven by the motor 11. An air guide 17 is provided between the impeller 16 and the motor frame 12, has a plurality of diffusers 19 and a return passage 21, and is enclosed in the casing 14. Impeller 1
The airflow sent out from 6 is guided by a diffuser 19 having a passage that expands toward the outer periphery, and is smoothly and independently connected to the end of the diffuser 19 to connect to the motor intake hole 2.
It flows into the return passage 21 which guides the airflow to zero.

エアーガイド17のディフューザ19と戻シ通路21と
のほぼ中間部にディフューザ19とケーシング14とを
接触させ、この点においてエアーガイド17のディフュ
ーザ19に軸方向に溝22′を形成し、これと前記ケー
シング14とによって小孔22としている。なお、小孔
22は溝22′とケーシング14とによって形成するこ
となく単独に形成してもよい。
The diffuser 19 and the casing 14 are brought into contact with each other approximately in the middle between the diffuser 19 of the air guide 17 and the return passage 21, and at this point, a groove 22' is formed in the axial direction in the diffuser 19 of the air guide 17, and the A small hole 22 is defined by the casing 14. Note that the small hole 22 may be formed independently without being formed by the groove 22' and the casing 14.

次に、この二実施例の構成における作用を説明する。駆
動用のモーター11により高速で回転したインペラ16
によって発生した気流はエアーガイド17に導かれ、デ
ィフューザ19で徐々に拡大しながらモーター吸気孔2
0へ導かれ、モーター内部を通ってモーター排気孔23
から排出される。
Next, the effects of the configurations of these two embodiments will be explained. Impeller 16 rotated at high speed by drive motor 11
The airflow generated by
0 and passes through the motor to the motor exhaust hole 23.
is discharged from.

この時、エアーガイド壁24のトング部26をインペラ
16の羽根16が通過する時、急激な圧力の変動が生じ
、このため羽根枚数2と回転数N(r、p、m)の積に
よって決まる周波数f (Hz )(すなわちf (H
z )=N −Z/so )の騒音を発生する。この種
の騒音は先にも述べたようにNZ音と呼ぶが、このNZ
音はディフューザ19.戻シ通路21を伝達し、七−タ
吸気孔20.排気孔23を伝達し外部に透過する。本実
施例においては、このNZ音の伝達経路の一部、すなわ
ちエアーガイド17のディフューザ19とケーシング1
4とにより小孔22が設けられており、この小孔22の
軸方向の長さ/、f、N Z音の波長の約に近くに設定
すると、このNZ音はこの小孔22に吸音され、結果と
してモーター排気孔23から外部へ透過するNZ音が低
減される。
At this time, when the blades 16 of the impeller 16 pass through the tongue portion 26 of the air guide wall 24, a sudden change in pressure occurs, which is determined by the product of the number of blades 2 and the rotation speed N (r, p, m). Frequency f (Hz) (i.e. f (H
z )=N − Z/so ) noise is generated. As mentioned earlier, this type of noise is called NZ sound.
The sound is diffuser 19. The return passage 21 is transmitted, and the seventh intake hole 20. It is transmitted through the exhaust hole 23 and permeates to the outside. In this embodiment, part of the transmission path of this NZ sound, that is, the diffuser 19 of the air guide 17 and the casing 1
4, a small hole 22 is provided by the small hole 22, and when the axial length of this small hole 22/, f, is set close to approximately the wavelength of the NZ sound, the NZ sound is absorbed by this small hole 22. As a result, the NZ sound transmitted from the motor exhaust hole 23 to the outside is reduced.

以上は音響回路における消音器すなわちサイドブランチ
として知られるがそれを図式化すると以下のようになる
The above is known as a muffler or side branch in an acoustic circuit, and it can be diagrammed as follows.

L= (2N−1) −C/4 f (Hz )(N:
1,2,3.・・・、C:音速)なお、上記小孔22の
数、形状については特に限定されない。
L= (2N-1) -C/4 f (Hz) (N:
1, 2, 3. ..., C: sound velocity) Note that the number and shape of the small holes 22 are not particularly limited.

発明の効果 本発明は、エアーガイドのディフューザに軸方向の小孔
を設けることにより、NZ音がこの小孔に吸音され電動
送風機の発生するNZ音を低減させる事ができたもので
、その効果は大きい。また構成もディフューザに軸方向
の小孔を設けるだけであシ、きわめて簡単なものである
Effects of the Invention The present invention is capable of reducing the NZ sound generated by an electric blower by providing small holes in the axial direction in the diffuser of the air guide so that the NZ sound is absorbed by the small holes. is big. Furthermore, the configuration is extremely simple, simply by providing a small hole in the axial direction in the diffuser.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例を示すエアーガイドとインペ
ラの拡大平面図、第2図は第1図のA−A断面図、第3
図は本発明の一実施例を示す電動送風機の部分断面図、
第4図は従来の電動送風機の分解斜視図である。 12・・・・・・モーターフレーム、14・・・・・・
、ケーシング、16・・・・・・インペラ、17・・・
・・・エアーガイド、19・・・・・・ディフューザ、
21・・・・・・戻り通路、22・・・・・・小孔@ 代理人の氏名 弁理士 中 尾 敏 男 ほか1名11
図      15.−イ21.9ず(r−m=羽根 第2図 fトー亡−タ ず7−−−エ71″イL゛ イ9−−−テ゛イフ、−亨゛ 2f−−一友・す111各 22−  小孔
Fig. 1 is an enlarged plan view of an air guide and impeller showing one embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig.
The figure is a partial sectional view of an electric blower showing an embodiment of the present invention.
FIG. 4 is an exploded perspective view of a conventional electric blower. 12...Motor frame, 14...
, casing, 16... impeller, 17...
...air guide, 19...diffuser,
21...Return passage, 22...Koana @ Agent's name Patent attorney Satoshi Nakao and 1 other person 11
Figure 15. -I 21.9 (r-m=Blade 2nd figure f to death 7--E 71'' I L 9--Tif, - 2f--Kazutomo Su 111 each 22- Small hole

Claims (1)

【特許請求の範囲】[Claims] モーターにより駆動される遠心形のインペラと、インペ
ラにより送出された気流が流動する複数のディフューザ
およびモーターへ気流を案内する複数の戻り通路を有す
るエアガイドと、これらインペラ、エアガイドを内包す
るケーシングとを有し、上記エアーガイドのディフュー
ザには軸方向に吸音用の小孔を形成した電動送風機。
A centrifugal impeller driven by a motor; an air guide having a plurality of diffusers through which the airflow sent out by the impeller flows; and a plurality of return passages that guide the airflow to the motor; and a casing containing the impeller and the air guide. The electric blower has a diffuser of the air guide with small holes for sound absorption formed in the axial direction.
JP60072964A 1985-04-05 1985-04-05 Electric blower Expired - Lifetime JPH0641759B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60072964A JPH0641759B2 (en) 1985-04-05 1985-04-05 Electric blower

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60072964A JPH0641759B2 (en) 1985-04-05 1985-04-05 Electric blower

Publications (2)

Publication Number Publication Date
JPS61232400A true JPS61232400A (en) 1986-10-16
JPH0641759B2 JPH0641759B2 (en) 1994-06-01

Family

ID=13504567

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60072964A Expired - Lifetime JPH0641759B2 (en) 1985-04-05 1985-04-05 Electric blower

Country Status (1)

Country Link
JP (1) JPH0641759B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104236203A (en) * 2014-09-19 2014-12-24 合肥华凌股份有限公司 Air cooling refrigerator and fan assembly
CN106224293A (en) * 2016-09-30 2016-12-14 广东美的环境电器制造有限公司 Diffuser, dynamical system and bladeless fan

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55104796U (en) * 1979-01-17 1980-07-22

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55104796U (en) * 1979-01-17 1980-07-22

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104236203A (en) * 2014-09-19 2014-12-24 合肥华凌股份有限公司 Air cooling refrigerator and fan assembly
CN106224293A (en) * 2016-09-30 2016-12-14 广东美的环境电器制造有限公司 Diffuser, dynamical system and bladeless fan

Also Published As

Publication number Publication date
JPH0641759B2 (en) 1994-06-01

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