JPH03168399A - Cooling fan device - Google Patents
Cooling fan deviceInfo
- Publication number
- JPH03168399A JPH03168399A JP1306717A JP30671789A JPH03168399A JP H03168399 A JPH03168399 A JP H03168399A JP 1306717 A JP1306717 A JP 1306717A JP 30671789 A JP30671789 A JP 30671789A JP H03168399 A JPH03168399 A JP H03168399A
- Authority
- JP
- Japan
- Prior art keywords
- cooling fan
- uniform flow
- noise
- filter
- exhaust duct
- 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
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 43
- 239000012530 fluid Substances 0.000 claims description 13
- 238000009423 ventilation Methods 0.000 claims description 3
- 239000011358 absorbing material Substances 0.000 abstract description 8
- 230000001788 irregular Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 241000252203 Clupea harengus Species 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000019514 herring Nutrition 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
Description
【ＩＩ１要】
冷却ファン装置に関し、
電子機器の冷却用ファンの発生する騒音を可能な限り低
減することを目的とし、
送風ファンの吸込み側近傍に整流体を配設して横威する
．[II1 Required] Regarding cooling fan devices, the aim is to reduce as much as possible the noise generated by cooling fans for electronic equipment, by placing a flow regulator near the suction side of the blower fan.
本発明は冷却ファン装置に関する．
電子機器は近年高密度化が進み、それに伴い単位体積当
たりの発熱量も増加している．より安価で、故障の少な
い冷却装置としては冷却ファンによる送風がｉ適である
．しかしながら、冷却ファンは、吸込側のエアーフロー
の乱れや、装置の空気抵抗さらに振動伝達等によって騒
音を発生する。
このような騒音を低減する方法の開発が求められている
．The present invention relates to a cooling fan device. Electronic devices have become denser in recent years, and the amount of heat generated per unit volume has also increased accordingly. A cooling fan is the most suitable cooling device that is cheaper and less likely to malfunction. However, cooling fans generate noise due to turbulence in airflow on the suction side, air resistance of the device, vibration transmission, and the like. There is a need to develop methods to reduce such noise.
第５図は従来の冷却ファン装置を示し、電子機器の筐体
ｌにはシェルフが設けられ、シエルフには多数の電子回
路のボード２が並べて装着されている。並べられたボー
ド２の後端側には吸気ダクト３が設けられ、吸気ダクト
３の後端に排気用の冷却ファン４が配設されている．冷
却ファン４の後流側には排気ダクト５が配設され、排気
ダクト５は冷却ファン４の直径より大きい口径となって
いる．
排気ダクト５の内面には吸音材６が固着されており、排
気はこの吸音材の表面を流れていくようになっている．
冷却ファン４が回転すると空気は筐体１の一方から矢印
八のように流入し、電子回路のボード２から熱を受けて
吸気ダクト３で集合され、冷却ファン４を通り、排気ダ
クト５から外へ排出される。吸込側のエアーフローの乱
れや、装置の空気抵抗さらに振動伝達等によって発生し
た騒音は排気ダクト５を通過するが、このとき吸音材６
により騒音が吸収される。FIG. 5 shows a conventional cooling fan device, in which a casing l of an electronic device is provided with a shelf, and a large number of electronic circuit boards 2 are mounted side by side on the shelf. An intake duct 3 is provided at the rear end of the arranged boards 2, and an exhaust cooling fan 4 is provided at the rear end of the intake duct 3. An exhaust duct 5 is provided on the downstream side of the cooling fan 4, and the exhaust duct 5 has a diameter larger than that of the cooling fan 4. A sound absorbing material 6 is fixed to the inner surface of the exhaust duct 5, and the exhaust gas flows through the surface of this sound absorbing material.
When the cooling fan 4 rotates, air flows in from one side of the housing 1 as shown by arrow 8, receives heat from the electronic circuit board 2, collects in the intake duct 3, passes through the cooling fan 4, and exits from the exhaust duct 5. is discharged to. Noise generated by turbulence in the air flow on the suction side, air resistance of the device, vibration transmission, etc. passes through the exhaust duct 5, but at this time, the sound absorbing material 6
noise is absorbed.
しかしながら、従来の装置では排気ダクト５内の吸音材
材６で発生後の騒音を吸収していたので、コストのわり
には騒音低減効果が小さく、騒音を大幅に低減すること
ができなかった．また、騒音低減効果を増すと、圧力損
失も堆大するという問題があった。
本発明は、上記欠点を解消すべくなされたもので、電子
機器の冷却ファンの発生する騒音を可能な限り低減する
冷却ファン装置を提供することを目的としている．However, in the conventional device, the sound-absorbing material 6 in the exhaust duct 5 absorbs the noise after it is generated, so the noise reduction effect is small considering the cost, and the noise cannot be significantly reduced. Furthermore, there is a problem in that increasing the noise reduction effect also increases pressure loss. The present invention was made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a cooling fan device that reduces as much as possible the noise generated by the cooling fan of an electronic device.
本発明を第！図により説明すると、送風ファン４の吸込
み側で、その近傍に整流体ｌＯを配設する．The present invention! To explain with a diagram, a rectifier lO is arranged near the suction side of the blower fan 4.
冷却ファン４の回転により、空気が整流体ｌＯを通過し
た後、冷却ファン４に流入し排出される。
整流体１０に流入する流体に乱流や堝及び不均一流速が
あれば、！！流体１０により流速が均一化され、一様な
流れとなって冷却ファン４に吸込まれる．そして、外に
排出される．騒音は空気の振動であり．その原因は乱流
、渦、不均一流速であるので、整流体１０で均一流速に
整ｄｔされるので騒音が低減される．
整流体１０による抵抗で圧力ｔ１１失を起こす速度域に
はないので、送風能力を６１なうことなしに駁音低減が
実現できる．As the cooling fan 4 rotates, air passes through the regulating fluid IO, flows into the cooling fan 4, and is discharged. If there is turbulence, a basin, or non-uniform flow velocity in the fluid flowing into the fluid regulator 10,! ! The fluid 10 equalizes the flow velocity and becomes a uniform flow that is sucked into the cooling fan 4. It is then discharged outside. Noise is air vibration. The causes of this are turbulence, vortices, and non-uniform flow velocity, so the flow velocity is adjusted to a uniform flow velocity dt by the regulating fluid 10, thereby reducing noise. Since the speed is not in the speed range where the pressure t11 is lost due to the resistance caused by the flow regulator 10, noise reduction can be achieved without reducing the air blowing capacity.
以下、本発明の実施例を図而に基づいて説門する．
筐体ｌにはンエルフが設けられ、シェルフには電子回路
のボード２が並べ装着されている．並んだボード２の後
端側には吸気ダクト３が設けられ、この吸気ダクト３内
であって、望ましくは、後述する冷却ファン４から少な
くとも２０帥以上離れた位置に整流体１０が配設されて
いる．整流体１０は流体の流れを整流するもので、この
等断面の形状は多角形、円形、楕円形等種々考えられ、
これらを利用するこのような整流体１０として細かい孔
を多数有する濾過器（フィルタ）がまず考えられる．こ
れら多数の細かい貫通孔が空気の通風孔となる．
この整流体ｌＯは吸気ダクト３の断面全域に渡って張ら
れており、吸気ダクト３を前端部１１と後端部１２とに
通気可能に区分する．
吸気ダクト３の後端中央部には排気用の冷却ファン４が
設けられ、冷却ファン４の後流側には俳気ダクト５が配
設されている．排気ダクト５は冷却ファン４の直径より
大きい口径となっており、その内面には吸音材６が固着
されている。
第２図、第３図には整流体１ｏとなる濾過器の具体例を
示し、第２図は縦線１４と横線１５からなる金Ｍ４１６
の平面図を示す．即ち平織の金網１６で、隣り合う線は
互い平行で、縦横線は略直交して０゛る・そして画威さ
れた目１’Ｎよ長方形又正方形である。
第３図は六角形のハニカム構造体１８の平面図を示し、
内部の単位六角形１９は一辺の長さがさらに小さいもの
を用いたり、大きいものを用いたりできる．
また、金網１６の目１７の大きさも風速や風量に合わせ
て自由に設定する．更に金網１６の織り方は平織に限ら
ず、綾織、杉綾織、畳織のものでもよい．
さて、冷却ファン４を回転させると、風が第１図の矢印
八方向から流入し、ボード２を冷却した後、整流体１０
を通過し、冷却ファン４に吸込まれる．その後風は排気
ダクト５を通り筐体１外に排出される．
ボード２上の外形不規則な装着部品に当たった流風は渦
や不均一流層を形戒するが、吸気ダクト３内の整流体１
０の濾過器を通過するときに大きな渦や不均一流層がミ
クロ的には細かく切りきざまれで、微小渦や微小不均一
流層となる。この流れはマクロ的に見ると渦のない均一
流層となっているので、空気振動の可聴騒音が大幅に消
失する。
又、排気ダクト５内の吸音材６により更に騒音が吸収さ
れる．平織金網は更に目の形を種々変えたメッシュ状の
もの使用してもよい。
第４図は実測結果を示す。グラフＹは従来の装置による
騒音レベルを表している。縦軸に騒音レベルｄＢ （デ
シベル）、横軸に時間Ｔを取り騒音メータを使って測定
した従来では騒音性が高く、かつ周期的に大きく騒音が
変化している．本発明の冷却ファン装置を用いた場合の
騒音強度をグラフＸで示す，３ｄＢレベルの騒音低減効
果と、音の安定化が表れている．
冷却ファンの回転に合わせて、整流体を金網、ケーシン
グや羽根の形状、風量、風速特性等にノ＼ニカム構造と
変更したり、更に平織、畳織、等織目の形を変更して最
適の濾過器を返沢することができる．Hereinafter, embodiments of the present invention will be explained based on illustrations. The housing 1 is equipped with an elf, and the electronic circuit boards 2 are mounted side by side on the shelf. An intake duct 3 is provided on the rear end side of the arranged boards 2, and a fluid regulator 10 is disposed within the intake duct 3, preferably at a position at least 20 squares away from a cooling fan 4, which will be described later. ing. The fluid rectifier 10 rectifies the flow of fluid, and the shape of this equal cross section may be polygonal, circular, elliptical, etc.
A filter having a large number of fine holes can be considered as a fluid regulator 10 that utilizes these. These many small through holes become air ventilation holes. This rectifier lO is stretched over the entire cross section of the intake duct 3, and divides the intake duct 3 into a front end 11 and a rear end 12 for ventilation. A cooling fan 4 for exhaust is provided at the center of the rear end of the intake duct 3, and an air duct 5 is provided downstream of the cooling fan 4. The exhaust duct 5 has a diameter larger than the diameter of the cooling fan 4, and a sound absorbing material 6 is fixed to the inner surface of the exhaust duct 5. FIGS. 2 and 3 show a specific example of a filter that serves as a flow regulator 1o, and FIG.
The plan view is shown below. That is, in the plain weave wire mesh 16, adjacent lines are parallel to each other, vertical and horizontal lines are approximately perpendicular to each other, and the mesh 1'N is rectangular or square. FIG. 3 shows a plan view of the hexagonal honeycomb structure 18,
The internal unit hexagon 19 may have smaller or larger side lengths. Furthermore, the size of the mesh 17 of the wire mesh 16 can be freely set according to the wind speed and volume. Further, the weave of the wire mesh 16 is not limited to plain weave, but may also be twill weave, herring twill weave, or tatami weave. Now, when the cooling fan 4 is rotated, wind flows in from the eight directions of the arrows in FIG.
and is sucked into the cooling fan 4. Thereafter, the air passes through the exhaust duct 5 and is exhausted outside the housing 1. The airflow that hits the irregularly shaped installed parts on the board 2 forms vortices and uneven flow layers, but the flow regulation 1 in the intake duct 3
When passing through the zero filter, large vortices and non-uniform flow layers are cut into small pieces on a microscopic scale, and become micro-vortices and micro-non-uniform flow layers. From a macroscopic perspective, this flow is a uniform flow layer with no eddies, so the audible noise caused by air vibrations is largely eliminated. Further, noise is further absorbed by the sound absorbing material 6 in the exhaust duct 5. The plain-woven wire mesh may also be mesh-like with various mesh shapes. Figure 4 shows the actual measurement results. Graph Y represents the noise level due to conventional equipment. Conventional methods, where the vertical axis is the noise level dB (decibels) and the horizontal axis is the time T, are measured using a noise meter, and the noise level is high and the noise changes significantly periodically. Graph X shows the noise intensity when using the cooling fan device of the present invention, which shows a noise reduction effect of 3 dB level and sound stabilization. In accordance with the rotation of the cooling fan, the flow regulating structure can be changed to wire mesh, the shape of the casing and blades, the air volume, the wind speed characteristics, etc. to the non-nicum structure, and the shape of the weave such as plain weave, tatami weave, etc. can be changed to make it optimal. The filter can be refilled.
以上説明してきたように、この発明によれば、冷却ファ
ンの吸込み側に整流体を配設したので、騒音の原因であ
る不均一な流速が均一化される．これにより一様な流速
の空気が冷却ファンに吸込まれるため、衝撃力が抑えら
れ、音が安定するとともに騒音レベルが大幅に低減する
。
かくして、構造が簡単で、安価に冷却ファンの風量能力
を田なうことなく騒音低減効果を得ることができる。
又、整流体を冷却ファンより２０帥以上乱して配置した
場合には、騒音低減効果をより向上させることができる
．As explained above, according to the present invention, since the flow regulator is provided on the suction side of the cooling fan, uneven flow velocity, which is a cause of noise, is made uniform. This allows air to be drawn into the cooling fan at a uniform flow rate, reducing impact forces, stabilizing sound, and significantly reducing noise levels. Thus, the structure is simple, and the noise reduction effect can be obtained at low cost without sacrificing the air volume capacity of the cooling fan. In addition, if the regulating fluid is arranged so as to be disturbed by 20 degrees or more from the cooling fan, the noise reduction effect can be further improved.
第１図は本発明の断面図、
第２図は濾過器の金網の平面図、
第３図は濾過器のハニカム構造の平面図、第４図は本発
明の効果を示すグラフ図、第５図は従来の断面図である
．
図において、
ｌは筐体、
２はボード、
３は吸気ダクト、
４は冷却ファン、
５は排気ダクト、
６は吸音材、
１０は整流体、
１６は金網、
１８はハニカム構造体である。Fig. 1 is a sectional view of the present invention, Fig. 2 is a plan view of the wire mesh of the filter, Fig. 3 is a plan view of the honeycomb structure of the filter, Fig. 4 is a graph showing the effects of the present invention, Fig. 5 The figure is a conventional cross-sectional view. In the figure, l is a housing, 2 is a board, 3 is an intake duct, 4 is a cooling fan, 5 is an exhaust duct, 6 is a sound absorbing material, 10 is a flow regulator, 16 is a wire mesh, and 18 is a honeycomb structure.
Claims (5)
）を配設した冷却ファン装置。(1) A fluid regulator (10
) cooling fan device.
する請求項１記載の冷却ファン装置。(2) The cooling fan device according to claim 1, wherein the flow regulator (10) is a filter.
る請求項２記載の冷却ファン装置。(3) The cooling fan device according to claim 2, wherein the filter is a wire mesh (16).
ことを特徴とする請求項２記載の冷却ファン装置。(4) The cooling fan device according to claim 2, wherein the filter is a cross-sectional honeycomb structure (18).
に排気用ファンが設けられるとともに、該ファンの後流
側に排気ダクトを有する冷却ファン装置において、 上記排気用ファンの吸い込み側近傍に、該 ファンの流速域にあっては圧力損失を生じない通風孔構
造を成す整流体を配置するとともに、 上記排気用ファンと上記整流体との間隙を ２０ミリメートル以上としたことを特徴とする冷却ファ
ン装置。(5) A cooling structure for an electronic device housing, in which a cooling fan device is provided with an exhaust fan at the rear end of the housing and an exhaust duct on the downstream side of the fan; A fluid regulator having a ventilation hole structure that does not cause pressure loss in the flow velocity range of the fan is arranged near the suction side, and the gap between the exhaust fan and the fluid regulator is set to 20 mm or more. Cooling fan device featuring features.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1306717A JP2575902B2 (en) | 1989-11-28 | 1989-11-28 | Housing cooling structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1306717A JP2575902B2 (en) | 1989-11-28 | 1989-11-28 | Housing cooling structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03168399A true JPH03168399A (en) | 1991-07-22 |
| JP2575902B2 JP2575902B2 (en) | 1997-01-29 |
Family
ID=17960449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1306717A Expired - Lifetime JP2575902B2 (en) | 1989-11-28 | 1989-11-28 | Housing cooling structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2575902B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6974376B2 (en) * | 2003-03-07 | 2005-12-13 | Denso Corporation | Air conditioner for vehicle with noise-reduction means |
| KR100792797B1 (en) * | 2006-08-28 | 2008-01-14 | 주식회사 대우일렉트로닉스 | Radiant heat device for preventing sound |
| JP2008175099A (en) * | 2007-01-17 | 2008-07-31 | Hitachi Ltd | Fan unit structure for computer |
| EP2339907A2 (en) | 2009-12-28 | 2011-06-29 | Fujitsu Limited | Ventilation system and rack apparatus |
| US10012242B2 (en) | 2014-10-07 | 2018-07-03 | Nidec Corporation | Axial flow fan |
| JP2020072173A (en) * | 2018-10-31 | 2020-05-07 | 中央電子株式会社 | Cooling device for electronic apparatus storage rack |
| WO2020235402A1 (en) * | 2019-05-20 | 2020-11-26 | 株式会社マキタ | Blower device |
| CN113426230A (en) * | 2021-06-22 | 2021-09-24 | 国网浙江省电力有限公司电力科学研究院 | Rotary type sound wave smoke eliminating device and using method thereof |
| JP2023081368A (en) * | 2021-11-30 | 2023-06-09 | 台達電子工業股▲ふん▼有限公司 | Cooling device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5865409U (en) * | 1981-10-27 | 1983-05-04 | タイホ−工業株式会社 | rectifier |
| JPS6220700A (en) * | 1985-07-17 | 1987-01-29 | Toshiba Corp | Fan device |
| JPS62134447A (en) * | 1985-12-06 | 1987-06-17 | Hitachi Ltd | Air speed control plate for air cooling |
-
1989
- 1989-11-28 JP JP1306717A patent/JP2575902B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5865409U (en) * | 1981-10-27 | 1983-05-04 | タイホ−工業株式会社 | rectifier |
| JPS6220700A (en) * | 1985-07-17 | 1987-01-29 | Toshiba Corp | Fan device |
| JPS62134447A (en) * | 1985-12-06 | 1987-06-17 | Hitachi Ltd | Air speed control plate for air cooling |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6974376B2 (en) * | 2003-03-07 | 2005-12-13 | Denso Corporation | Air conditioner for vehicle with noise-reduction means |
| KR100792797B1 (en) * | 2006-08-28 | 2008-01-14 | 주식회사 대우일렉트로닉스 | Radiant heat device for preventing sound |
| JP2008175099A (en) * | 2007-01-17 | 2008-07-31 | Hitachi Ltd | Fan unit structure for computer |
| EP2339907A2 (en) | 2009-12-28 | 2011-06-29 | Fujitsu Limited | Ventilation system and rack apparatus |
| US10012242B2 (en) | 2014-10-07 | 2018-07-03 | Nidec Corporation | Axial flow fan |
| JP2020072173A (en) * | 2018-10-31 | 2020-05-07 | 中央電子株式会社 | Cooling device for electronic apparatus storage rack |
| WO2020235402A1 (en) * | 2019-05-20 | 2020-11-26 | 株式会社マキタ | Blower device |
| CN113426230A (en) * | 2021-06-22 | 2021-09-24 | 国网浙江省电力有限公司电力科学研究院 | Rotary type sound wave smoke eliminating device and using method thereof |
| JP2023081368A (en) * | 2021-11-30 | 2023-06-09 | 台達電子工業股▲ふん▼有限公司 | Cooling device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2575902B2 (en) | 1997-01-29 |
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