JP4083259B2 - Axial fan - Google Patents

Axial fan Download PDF

Info

Publication number
JP4083259B2
JP4083259B2 JP13811497A JP13811497A JP4083259B2 JP 4083259 B2 JP4083259 B2 JP 4083259B2 JP 13811497 A JP13811497 A JP 13811497A JP 13811497 A JP13811497 A JP 13811497A JP 4083259 B2 JP4083259 B2 JP 4083259B2
Authority
JP
Japan
Prior art keywords
hub
axial fan
opening
outer periphery
front opening
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.)
Expired - Fee Related
Application number
JP13811497A
Other languages
Japanese (ja)
Other versions
JPH10325398A (en
Inventor
弘成 小方
潤 松井
Original Assignee
松下エコシステムズ株式会社
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 松下エコシステムズ株式会社 filed Critical 松下エコシステムズ株式会社
Priority to JP13811497A priority Critical patent/JP4083259B2/en
Publication of JPH10325398A publication Critical patent/JPH10325398A/en
Application granted granted Critical
Publication of JP4083259B2 publication Critical patent/JP4083259B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/329—Details of the hub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • F04D29/682—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid extraction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • F04D29/684—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid injection

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、換気送風機器等に使用される軸流ファンに関するものである。
【０００２】
【従来の技術】
従来のこの種の軸流ファンについて図６および図７を参照しながら説明する。
【０００３】
図６に示すように、軸流ファン１０１はハブ１０２の外周に複数のブレード１０３を設け、電動機１０４のシャフト１０５に取付けられている。そしてハブ１０２はシャフト１０５の取付側の対面は全面開放されているのが通常である。これは軸流ファン１０１の取付取外しの便と、回転バランス調整用のバランスウェイト（図示せず）の取付を容易にするためである。
【０００４】
また図７に示すものはハブ１０６の前面開放部をカバー１０７で覆ったものである。
【０００５】
【発明が解決しようとする課題】
このような従来の軸流ファンでは、運転時の気流が矢印のごとくハブ１０２に当って乱流渦が発生し、送風効率の低下と騒音が増大するという課題がある。
【０００６】
また、図７に示すハブ１０６のように前面をカバー１０７で覆った場合も乱流渦は発生し、かつ回転バランス調整のための検査およびバランスウェイトの取付作業に手間がかかるようになるという課題もあり、簡単な構成でこれらの課題を解決することが要求されている。
【０００７】
本発明は、このような従来の課題を解決するものであり、運転時の乱流渦を逃がすことにより送風効率向上と騒音の低下ができる軸流ファンを提供することを目的としている。
【０００８】
【課題を解決するための手段】
本発明の軸流ファンは上記目的を達成するために、円筒の両端を塞いだ形状のハブの前面中央と外周に開口を設けたものである。
【０００９】
本発明によれば、運転時ハブ前面に発生する乱流渦を中央の開口から吸い込み、外周の開口より逃がすことにより、送風効率と騒音を良化することができる軸流ファンが得られる。
【００１０】
また、他の手段は、乱流渦を逃がす開口をハブ背面の外縁部に設けたものである。
【００１１】
そして本発明によれば上記の発明と同様の軸流ファンが得られる。
【００１２】
【発明の実施の形態】
本発明は、円筒の両端を塞いだ形状のハブに前面開口と外周開口を設けたものであり、軸流ファンの運転時発する乱流渦がハブ前面に当ると前面開口に吸い込まれ、外周開口から出て行くという作用を有する。
【００１３】
また、円筒の両端を塞いだ形状のハブに前面開口と背面の外縁に開口を設けたものであっても上記と同じ作用を有する。
【００１４】
以下、本発明の実施例について図面を参照しながら説明する。なお図中、従来例と同一部分については同一番号を付す。
【００１５】
【実施例】
（実施例１）
図１ないし図３に示すように、軸流ファン１は、ハブ２の外周に複数のブレード１０３を設け、電動機１０４のシャフト１０５に取付けられている。そしてハブ２は平たい円筒の両端を塞いだ形であって、前面すなわち気流の上流側中央部に円形の前面開口３と、外周の円周方向に複数の円形の外周開口４が等間隔に設けられている。
【００１６】
上記構成において、電動機１０４を運転し軸流ファン１が回転するとシャフト１０５の軸方向に平行に気流が発生することで、ハブ２の内外で差圧が生じ、ハブ２内の空気は外周開口４より流出する。このことによりハブ２の前面の気流は前面開口３より流入し、ハブ２の前面に発生した乱流渦は消失する。この場合、外周開口４の総面積は前面開口３と等しいものとする。
【００１７】
図２は、前面開口３の縁にアール付けをしてカール部３Ａとすることによって気流の流れを助けるものである。そして前面開口３からバランスウェイトの取付およびファンの軸への取付取外しは容易にできる。
【００１８】
図３は、外周開口４の下流側の縁に気流の下流側へ傾斜した面取り部４Ａを設けて排出を助けるものである。
【００１９】
（実施例２）
図４は、ハブ２の背面すなわちシャフト１０５の取付面の外縁寄りに円周方向に複数の背面開口５を設けたものであり、前面開口３から入った気流はファンの気流と平行して背面開口５から流出するものであり、出口における乱れは少なくなる。
【００２０】
（実施例３）
図５は、前面を開口したハブ６の外径より一定寸法大きくした外径の円形皿状の前面部７を同心に取付けることによりハブ６の外周全面にわたって間隙部８を設けたものであり、前記２例と同様の作用を有する。
【００２１】
以上の諸構成により、従来構造のハブに比して発生騒音は実験の結果特に耳障りである５００Hz〜１０００Hzの周波数域において１〜１．６ｄＢ低下するものである。これは乱流渦が減少することによってその渦の周波数成分が低減することに他ならない。
【００２２】
【表１】

Figure 0004083259
【００２３】
【発明の効果】
以上の実施例から明らかなように本発明によれば、運転することにより発生する気流のうちハブ前面に当り乱流渦となるものを前面開口から取り入れ外周開口から逃がし、乱流渦による騒音の発生を低下させ環境改善を行うと共に、整流作用により送風効率も改善できる効果のある軸流ファンを提供できる。
【図面の簡単な説明】
【図１】本発明の実施例１の基本構造を示す要部断面図
【図２】同前面開口の変化を示す要部断面図
【図３】同外周開口の変化を示す要部断面図
【図４】本発明の実施例２の構造を示す要部断面図
【図５】同実施例３の構造を示す要部断面図
【図６】従来の軸流ファンの構造を示す要部断面図
【図７】同他の構造を示す要部断面図
【符号の説明】
１ 軸流ファン
２ ハブ
３ 前面開口
３Ａ カール部
４ 外周開口
４Ａ 面取り部
５ 背面開口
６ ハブ
７ 前面部
８ 間隙部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an axial fan used in a ventilation fan or the like.
[0002]
[Prior art]
A conventional axial fan of this type will be described with reference to FIGS.
[0003]
As shown in FIG. 6, the axial fan 101 is provided with a plurality of blades 103 on the outer periphery of the hub 102 and attached to the shaft 105 of the electric motor 104. The hub 102 is generally open to the entire surface facing the mounting side of the shaft 105. This is for facilitating the attachment / detachment of the axial fan 101 and the attachment of a balance weight (not shown) for adjusting the rotational balance.
[0004]
FIG. 7 shows that the front opening portion of the hub 106 is covered with a cover 107.
[0005]
[Problems to be solved by the invention]
In such a conventional axial fan, there is a problem that a turbulent vortex is generated when the airflow during operation hits the hub 102 as shown by an arrow, and the blowing efficiency is reduced and the noise is increased.
[0006]
Further, when the front surface is covered with the cover 107 as in the hub 106 shown in FIG. 7, turbulent vortices are generated, and it takes time to perform the inspection for adjusting the rotational balance and the work for attaching the balance weight. Therefore, it is required to solve these problems with a simple configuration.
[0007]
The present invention solves such a conventional problem, and an object of the present invention is to provide an axial fan capable of improving air blowing efficiency and reducing noise by releasing turbulent vortices during operation.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the axial fan of the present invention is provided with openings in the center and outer periphery of the front surface of a hub having a shape in which both ends of a cylinder are closed .
[0009]
According to the present invention, it is possible to obtain an axial fan capable of improving the air blowing efficiency and noise by sucking the turbulent vortex generated on the front face of the hub during operation from the central opening and letting it escape from the outer peripheral opening.
[0010]
Another means is to provide an opening at the outer edge of the rear face of the hub for releasing the turbulent vortex.
[0011]
And according to this invention, the axial fan similar to said invention is obtained.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a front opening and an outer peripheral opening are provided in a hub whose shape is closed at both ends of a cylinder. When a turbulent vortex generated during operation of an axial fan hits the front of the hub, the front opening is sucked into the outer opening. It has the effect of leaving.
[0013]
Further, even if a hub having a shape in which both ends of a cylinder are closed and a front opening and an opening at the outer edge of the back are provided, the same effect as described above is obtained.
[0014]
Embodiments of the present invention will be described below with reference to the drawings. In the figure, the same parts as those in the conventional example are denoted by the same reference numerals.
[0015]
【Example】
Example 1
As shown in FIGS. 1 to 3, the axial fan 1 is provided with a plurality of blades 103 on the outer periphery of the hub 2 and attached to a shaft 105 of an electric motor 104. The hub 2 has a shape in which both ends of a flat cylinder are closed, and a circular front opening 3 is provided at the front surface, that is, an upstream central portion of the air flow, and a plurality of circular outer openings 4 are provided at equal intervals in the circumferential direction of the outer periphery. It has been.
[0016]
In the above configuration, when the motor 104 is operated and the axial fan 1 rotates, an air flow is generated parallel to the axial direction of the shaft 105, thereby generating a differential pressure inside and outside the hub 2. More outflow. As a result, the airflow in front of the hub 2 flows from the front opening 3 and the turbulent vortex generated on the front surface of the hub 2 disappears. In this case, it is assumed that the total area of the outer peripheral opening 4 is equal to the front opening 3.
[0017]
FIG. 2 assists the flow of the airflow by rounding the edge of the front opening 3 to form a curled portion 3A. Then, the balance weight can be easily attached to and removed from the fan shaft from the front opening 3.
[0018]
FIG. 3 provides a chamfered portion 4 </ b> A inclined toward the downstream side of the airflow at the downstream edge of the outer peripheral opening 4 to assist discharge.
[0019]
(Example 2)
FIG. 4 shows a configuration in which a plurality of rear openings 5 are provided in the circumferential direction on the rear surface of the hub 2, that is, near the outer edge of the mounting surface of the shaft 105, and the airflow entering from the front opening 3 is parallel to the fan airflow. It flows out from the opening 5, and the turbulence at the outlet is reduced.
[0020]
(Example 3)
FIG. 5 shows a case in which a gap portion 8 is provided over the entire outer periphery of the hub 6 by concentrically attaching a circular dish-shaped front portion 7 having an outer diameter larger than the outer diameter of the hub 6 having an open front surface. It has the same action as the above two examples.
[0021]
With the above-described configurations, the generated noise is reduced by 1 to 1.6 dB in the frequency range of 500 Hz to 1000 Hz, which is particularly annoying as a result of experiments, as compared with the hub of the conventional structure. This is nothing but a decrease in the frequency component of the vortex due to a decrease in the turbulent vortex.
[0022]
[Table 1]
Figure 0004083259
[0023]
【The invention's effect】
As is apparent from the above embodiments, according to the present invention, airflow generated by operation that hits the front of the hub and becomes a turbulent vortex is taken in from the front opening and escaped from the outer peripheral opening, and noise generated by the turbulent vortex is reduced. It is possible to provide an axial fan that has an effect of reducing the generation and improving the environment and improving the air blowing efficiency by the rectifying action.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of the main part showing the basic structure of Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the main part showing a change in the front opening. 4 is a cross-sectional view of the main part showing the structure of Example 2 of the present invention. FIG. 5 is a cross-sectional view of the main part showing the structure of Example 3. FIG. 6 is a cross-sectional view of the main part showing the structure of a conventional axial fan. FIG. 7 is a cross-sectional view of the main part showing the other structure.
DESCRIPTION OF SYMBOLS 1 Axial fan 2 Hub 3 Front opening 3A Curl part 4 Outer periphery opening 4A Chamfering part 5 Rear opening 6 Hub 7 Front part 8 Gap part

Claims (2)

円筒の両端を塞いだ形状のハブと、前記ハブの外周に複数のブレードを設け、前記ハブの前面中央に設けた前面開口と、前記ハブの外周の円周方向に沿って設けた複数の外周開口を備えた軸流ファン。 A hub having a shape in which both ends of a cylinder are closed, a plurality of blades are provided on the outer periphery of the hub , a front opening provided in the center of the front surface of the hub, and a plurality of outer periphery provided along a circumferential direction of the outer periphery of the hub An axial fan with an opening. 円筒の両端を塞いだ形状のハブと、前記ハブの外周に複数のブレードを設け、前記ハブの前面中央に設けた前面開口と、前記ハブの背面の外縁部に背面開口を設けた軸流ファン。An axial fan in which both ends of a cylinder are closed, a plurality of blades are provided on the outer periphery of the hub , a front opening is provided in the center of the front surface of the hub, and a rear opening is provided at an outer edge portion of the rear surface of the hub. .
JP13811497A 1997-05-28 1997-05-28 Axial fan Expired - Fee Related JP4083259B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13811497A JP4083259B2 (en) 1997-05-28 1997-05-28 Axial fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13811497A JP4083259B2 (en) 1997-05-28 1997-05-28 Axial fan

Publications (2)

Publication Number Publication Date
JPH10325398A JPH10325398A (en) 1998-12-08
JP4083259B2 true JP4083259B2 (en) 2008-04-30

Family

ID=15214293

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13811497A Expired - Fee Related JP4083259B2 (en) 1997-05-28 1997-05-28 Axial fan

Country Status (1)

Country Link
JP (1) JP4083259B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050052151A (en) * 2003-11-29 2005-06-02 엘지전자 주식회사 Fan of refrigerator
US20150204345A1 (en) * 2012-10-03 2015-07-23 Mitsubishi Electric Corporation Propeller fan
CN106122090B (en) * 2016-08-12 2019-02-22 珠海格力电器股份有限公司 Axial-flow windwheel and axial flow blower

Also Published As

Publication number Publication date
JPH10325398A (en) 1998-12-08

Similar Documents

Publication Publication Date Title
JP3979388B2 (en) Blower
CN100485193C (en) Blower
JP2001271790A (en) Centrifugal impeller and air cleaner
JPS61279800A (en) Fan
JP2000087898A (en) Axial flow blower
JP3969354B2 (en) Centrifugal fan and its application
JP4083259B2 (en) Axial fan
JPH09126190A (en) Centrifugal type blower
JP3688864B2 (en) Air intake structure of automotive air purifier
JP2000145690A (en) Electric blower and vacuum cleaner with the same
JP3607769B2 (en) Centrifugal blower
JP2929834B2 (en) Centrifugal fan
JP4243105B2 (en) Impeller
GB2064668A (en) Fan Blade
JP3938252B2 (en) Multi-blade blower
JP3724211B2 (en) Electric blower
JP3420420B2 (en) Axial fan
JP2004068611A (en) Bellmouth connected with blower wind tunnel part
JP3163739B2 (en) Electric blower impeller
JP3445056B2 (en) Ventilation device for image forming device
FI74115C (en) PROPELLER.
JPH01300099A (en) Axial flow fan
JP3052591B2 (en) Electric blower impeller
JP3632745B2 (en) Air conditioner
JP2002054595A (en) Centrifugal fan

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20040528

RD01 Notification of change of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7421

Effective date: 20040614

RD01 Notification of change of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7421

Effective date: 20050620

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070509

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070515

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20070717

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20080115

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20080213

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110222

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110222

Year of fee payment: 3

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110222

Year of fee payment: 3

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120222

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130222

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130222

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140222

Year of fee payment: 6

LAPS Cancellation because of no payment of annual fees