JPH01169194A - Silencer - Google Patents
SilencerInfo
- Publication number
- JPH01169194A JPH01169194A JP62333863A JP33386387A JPH01169194A JP H01169194 A JPH01169194 A JP H01169194A JP 62333863 A JP62333863 A JP 62333863A JP 33386387 A JP33386387 A JP 33386387A JP H01169194 A JPH01169194 A JP H01169194A
- Authority
- JP
- Japan
- Prior art keywords
- noise
- resonance chamber
- wind tunnel
- hole
- frequency
- 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.)
- Pending
Links
- 230000003584 silencer Effects 0.000 title claims 2
- 238000004891 communication Methods 0.000 claims abstract description 14
- 230000030279 gene silencing Effects 0.000 abstract description 10
- 235000013290 Sagittaria latifolia Nutrition 0.000 abstract 1
- 235000015246 common arrowhead Nutrition 0.000 abstract 1
- 238000000638 solvent extraction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000000644 propagated effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000001743 silencing effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
- F01N1/023—Helmholtz resonators
Abstract
Description
【発明の詳細な説明】
〔概要〕
送風を案内する風洞に連通ずる共鳴室を形成したボック
スを設けることで送風によって伝播される騒音を消音す
る消音器に関し、
周波数のバラツキがある騒音に対して所定の消音効果が
得られるようにすることを目的とし、連通穴に重ねられ
る貫通穴を有し、側壁に沿ってスライドされ、風洞と共
鳴室とを連通ずる穴の断面積を変える可動部材が具備さ
れるように構成する。[Detailed Description of the Invention] [Summary] This invention relates to a muffler that muffles noise propagated by air blowing by providing a box forming a resonance chamber that communicates with a wind tunnel that guides air blowing, and which suppresses noise with frequency variations. The purpose is to obtain a predetermined sound deadening effect, and there is a movable member that has a through hole that overlaps the communication hole, and that is slid along the side wall to change the cross-sectional area of the hole that communicates the wind tunnel and the resonance chamber. configured so that it is provided.
本発明は送風を案内する風洞に連通ずる共鳴室を形成し
たボックスを設けることで送風によって伝播される騒音
を消音する消音器に関する。The present invention relates to a muffler that muffles noise propagated by air blowing by providing a box having a resonance chamber that communicates with a wind tunnel that guides air blowing.
電子装置においては内設された電子機器より発生する発
熱は、−膜内に、外気を装置内に取り込み、取り込んだ
空気を装置外に排気する空冷による冷却が行われている
。In an electronic device, the heat generated by the internally installed electronic equipment is cooled by air cooling, which takes outside air into the device into a membrane and exhausts the taken air outside the device.
このような空気の送出には、通常、送風機が用いられ送
風機の駆動によって行われる。A blower is normally used to blow out the air, and the blower is driven.
しかし、このような送風機の駆動に際しては騒音が発生
するため、特に、これらの電子装置が一般の事務室など
に設置される場合は、このような騒音を極力小さくする
ように消音効果の高い消音器が要望される。However, noise is generated when these blowers are driven, so especially when these electronic devices are installed in general offices, it is necessary to use highly effective sound deadening equipment to minimize such noise. Equipment is required.
従来は第４図の従来の説明図に示すように構成されてい
た。第４図の（ａ） （ｂ）は側面断面図、（Ｃ）は音
圧と周波数の関係グラフである。Conventionally, the configuration was as shown in the conventional explanatory diagram of FIG. 4. FIGS. 4(a) and 4(b) are side sectional views, and FIG. 4(C) is a graph showing the relationship between sound pressure and frequency.
第４図の（ａ）に示すように、一端に送風機１０が係止
され、送風機１０より送出される空気が矢印Ａのように
他端より送出される風洞２０を形成するダクト１６には
共鳴室１８を形成するボックス１７を設はダクト１６の
側壁１６Ａに設けられた貫通穴１２を介して共鳴室１８
が風洞２０に連通されるように構成されている。As shown in FIG. 4(a), a duct 16 forming a wind tunnel 20 has a blower 10 locked at one end, and the air sent out from the blower 10 is sent out from the other end as shown by arrow A. The box 17 forming the chamber 18 is installed in the resonance chamber 18 through the through hole 12 provided in the side wall 16A of the duct 16.
is configured to communicate with the wind tunnel 20.
また、ボックス１７に形成される空洞の共鳴室１８の容
積Ｖａはアクチュエータ１９によって矢印のように可動
される可動板１７Ａにより変えられるように形成されて
いる。Further, the volume Va of the hollow resonance chamber 18 formed in the box 17 is configured to be changed by a movable plate 17A that is moved by an actuator 19 in the direction of an arrow.
したがって、風洞２０に連通される共鳴室１８の容積Ｖ
ａを変化させることで所定の騒音の周波数に共鳴させ、
その騒音の音圧を減衰させることで所定の消音特性が得
ることが行われていた。Therefore, the volume V of the resonance chamber 18 communicating with the wind tunnel 20
By changing a, it resonates with the predetermined noise frequency,
A predetermined silencing characteristic has been obtained by attenuating the sound pressure of the noise.
そこで、このような消音では、消音すべき騒音の周波数
が所定の範囲の場合、例えば（ｃ）に示す実線のような
騒音のピークがＰｌとなる騒音に於いては共鳴室１８の
容積ＶａをＰｉの箇所の周波数に共鳴する共鳴周波数を
得るように容積Ｖａを変化させることで消音を行うこと
ができる。Therefore, in such silencing, when the frequency of the noise to be muted is within a predetermined range, for example, in the case of noise where the peak of the noise is Pl as shown in the solid line shown in (c), the volume Va of the resonance chamber 18 is Sound can be muted by changing the volume Va so as to obtain a resonant frequency that resonates with the frequency of the location Pi.
しかし、（ｃ）の点線で示すように、騒音のピークがＰ
ｌ、Ｐ２およびＰ３のように広い周波数に及ぶ場合は、
それぞれの周波数に共鳴する共鳴周波数を得るように容
積Ｖａを形成する必要がある。However, as shown by the dotted line in (c), the peak of the noise is P
When covering a wide frequency range like l, P2 and P3,
It is necessary to form the volume Va so as to obtain a resonance frequency that resonates with each frequency.
そこで、（ｂ）に示すように、一端に送風機１０が係止
され、送風機１０より送出される空気が矢印Ａのように
他端より送出される風洞１３を形成するダクト１１には
共鳴室１４を形成するボックス１５Ａ、 １５Ｂ。Therefore, as shown in (b), a resonance chamber 14 is attached to the duct 11 forming a wind tunnel 13 where the blower 10 is locked at one end and the air sent out from the blower 10 is sent out from the other end as shown by arrow A. Boxes 15A and 15B forming the.
１５Ｃを設け、ダクトｌｌの側壁１１Ａに設けられた貫
通穴１２を介してそれぞれの共鳴室１４が風洞１３に連
通されるように構成し、それぞれのボックス１５Ａ。15C, each resonance chamber 14 is configured to be communicated with the wind tunnel 13 via a through hole 12 provided in the side wall 11A of the duct 11, and each box 15A.
１５Ｂ、１５Ｃに形成される空洞の共鳴室１４の容積は
Ｖｌ。The volume of the hollow resonance chamber 14 formed in 15B and 15C is Vl.
Ｖ２． Ｖ３・のように異なるように形成することで、
消音を行うことができる。V2. By forming it differently like V3.
Can be muted.
この場合は、（ｃ）の点線で示すように、送風機１０よ
り送出される騒音の周波数Ｈｚが広い範囲にあっても、
容積Ｖｌの共鳴室１４によってＰｉの箇所の周波数Ｈ２
に、容積ｖ２の共鳴室によってＰ２の箇所の周波数Ｈ２
に、容積ｖ３の共鳴室によってＰ３の箇所の周波数Ｈ２
にそれぞれ共鳴させることで消音が行える。In this case, as shown by the dotted line in (c), even if the frequency Hz of the noise sent out from the blower 10 is in a wide range,
The frequency H2 at the point Pi by the resonance chamber 14 with the volume Vl
Then, the frequency H2 at the point P2 is set by a resonant chamber with a volume v2.
Then, the frequency H2 at the point P3 is set by a resonant chamber with a volume v3.
Sound can be muted by resonating with each of them.
しかし、第３図の（ａ）に示す構成の場合は騒音のピー
クとなる周波数Ｈ２に共鳴するように共鳴室１８の容積
Ｖａを変化させ、所定の消音特性を得ることができるが
、騒音のピークとなる周波数Ｈ２がバラツキの広い範囲
の周波数１１２を有する場合は、全体的に消音を行うこ
とができない問題を有していた。However, in the case of the configuration shown in FIG. 3(a), it is possible to change the volume Va of the resonance chamber 18 so as to resonate at the frequency H2, which is the peak of the noise, and obtain a predetermined silencing characteristic. When the peak frequency H2 has a frequency 112 in a wide range of variations, there is a problem in that it is not possible to completely mute the sound.
また、第３図の（ｂ）に示す構成の場合は、騒音のピー
クとなる周波数Ｈ２がバラツキの広い範囲の周波数Ｈｚ
を有していても、それぞれの共鳴室１５八。In addition, in the case of the configuration shown in FIG. 3(b), the frequency H2 at which the noise peaks is within a wide range of frequencies Hz.
Even with each resonance chamber 158.
１５Ｂ、 １５Ｃの容積Ｖｌ−Ｖ３が騒音のピークとな
る周波数Ｈｚに共鳴するように形成することで消音を行
うことができるが、予め想定した騒音の周波数Ｈ２と実
際の騒音の周波数Ｈ２とには製造時の加工１組立の精度
により多少のズレが生じるため、このようなズレを修正
し、共鳴するように容積ｖ１〜ｖ３を調整させることが
できない。Sound can be muted by forming the volumes Vl-V3 of 15B and 15C to resonate with the frequency Hz that is the peak of the noise, but there is a difference between the pre-assumed noise frequency H2 and the actual noise frequency H2. Since some deviations occur due to the accuracy of processing and assembly during manufacturing, it is not possible to correct such deviations and adjust the volumes v1 to v3 so that they resonate.
したがって、所定の消音特性が得られない問題を有して
いた。Therefore, there was a problem in that predetermined silencing characteristics could not be obtained.
そこで、本発明では、周波数のバラツキがある騒音に対
して所定の消音効果が得られるようにすることを目的と
する。Therefore, it is an object of the present invention to provide a predetermined silencing effect for noise with frequency variations.
第１図は本発明の原理説明図である。 FIG. 1 is a diagram explaining the principle of the present invention.
第１図に示すように、連通穴に重ねられる貫通穴を有し
、側壁に沿ってスライドされ、風洞と共鳴室とを連通ず
る穴の断面積を変える可動部材が具備されるように構成
する。As shown in FIG. 1, it has a through hole that overlaps the communication hole, and is provided with a movable member that is slid along the side wall and changes the cross-sectional area of the hole that communicates the wind tunnel and the resonance chamber. .
このように構成することによって前述の問題点は解決さ
れる。With this configuration, the above-mentioned problems are solved.
即ち、送風される風洞と共鳴室とを連通ずる連通穴の大
きさを可動部材のスライドによって大きくまたは小さく
するように形成したものである。That is, the size of the communication hole through which air is blown from the wind tunnel and the resonance chamber is made larger or smaller by sliding the movable member.
したがって、風洞と共鳴室と連通ずる断面積を変化させ
ることにより共鳴室の共鳴周波数を変化させ、所定の騒
音に共鳴させるようにすることができ、従来のような共
鳴室の容積を変えることなく消音特性の調整を行うこと
ができる。Therefore, by changing the cross-sectional area that communicates with the wind tunnel and the resonance chamber, it is possible to change the resonance frequency of the resonance chamber and make it resonate with a predetermined noise, without changing the volume of the resonance chamber as in the past. It is possible to adjust the silencing characteristics.
以下本発明を第２図および第３図を参考に詳細に説明す
る。第２図は本発明による一実施例の説明図で、（ａ）
は斜視図、（ｂ）は正面図、（Ｃ）は側面断面図、第３
図は本発明の他の実施例の説明図で（ａ）は斜視図、（
ｂ）は正面図、（Ｃ）は側面断面図である。The present invention will be explained in detail below with reference to FIGS. 2 and 3. FIG. 2 is an explanatory diagram of an embodiment according to the present invention, (a)
is a perspective view, (b) is a front view, (C) is a side sectional view, and
The figures are explanatory diagrams of other embodiments of the present invention; (a) is a perspective view; (a) is a perspective view;
b) is a front view, and (C) is a side sectional view.
企図を通じて、同一符号は同一対象物を示す。Like numbers refer to like objects throughout the design.
第２図の（ａ）に示すように、筒状の側壁１Ａによって
形成された風洞２に矢印Ａのように送風されることで騒
音が伝播されるダクト１の周囲に対して外壁６と仕切板
７とを設けることで複数の共鳴室４を有するボックス３
を形成するように構成したものである。As shown in FIG. 2(a), there is an outer wall 6 and a partition around the duct 1, where noise is propagated by blowing air in the direction of arrow A into the wind tunnel 2 formed by the cylindrical side wall 1A. A box 3 having a plurality of resonance chambers 4 by providing a plate 7
It is configured to form a
また、側壁１Ａに沿って摺動される筒状の可動部材５が
設けられ、（ｂ）に示すように側壁１Ａに設けられた連
通穴１Ｂと可動部材５に設けられた貫通穴５Ａとが重な
り合うように形成されている。Further, a cylindrical movable member 5 that slides along the side wall 1A is provided, and as shown in (b), the communication hole 1B provided in the side wall 1A and the through hole 5A provided in the movable member 5 are connected. They are formed so that they overlap.
そこで、矢印Ｃに示すように可動部材５を回動させるこ
とで連通穴１Ｂと貫通穴５Ａとの重なりをずらし、（ｂ
）のＤ−Ｄ断面図である（ｃ）に示すように、騒音が伝
播される風洞２に連通ずるそれぞれの共鳴室４との連通
穴の断面積Ｓが大きく、または、小さくするようにした
ものである。Therefore, by rotating the movable member 5 as shown by arrow C, the overlap between the communication hole 1B and the through hole 5A is shifted, and (b
), the cross-sectional area S of the communication hole with each resonance chamber 4 communicating with the wind tunnel 2 through which noise is propagated is made large or small. It is something.
このような構成では共鳴周波数ｆ９はＣを常温における
音速とし、■を共鳴室４の容積とし、Ｓを連通穴の断面
積とし、ｌを連通穴の長さとすると（１）弐のようにな
る。In such a configuration, the resonance frequency f9 is as shown in (1) 2, where C is the sound speed at room temperature, ■ is the volume of the resonance chamber 4, S is the cross-sectional area of the communicating hole, and l is the length of the communicating hole. .
したがって、前述の送風機１０の送風口にダクト１を併
設し、可動部材５を回動させることで断面積Ｓを大きく
、または、小さくし、連通穴の断面積Ｓを変化させるこ
とで共鳴周波数ｆ、を実際の送風機１０より送出される
騒音の周波数に合致させ、共鳴室４の容積Ｖを変化させ
た場合と同等の所定の消音特性を得ることができる。Therefore, by providing the duct 1 at the air outlet of the aforementioned blower 10 and rotating the movable member 5, the cross-sectional area S can be increased or decreased, and by changing the cross-sectional area S of the communication hole, the resonant frequency f can be adjusted. , can be made to match the frequency of the noise emitted from the actual blower 10, and a predetermined silencing characteristic equivalent to that obtained by changing the volume V of the resonance chamber 4 can be obtained.
また、第３図に示すように構成することでも同様の消音
特性を得ることができる。Furthermore, similar noise reduction characteristics can be obtained by configuring as shown in FIG.
第３図の場合は、（ａ） （ｂ）に示すように、風洞２
を形成するダクト１の側壁１Ａには摺動される複数の可
動板５−１ 、５−２．５−３を設けるように構成し、
それぞれの可動板５−１．５−Ｌ５−２．５−３を矢印
Ｃのように回動させ、実際に共鳴室４−１ 、４−２
、４−３に連通される連通穴の大きさが変えられるよう
に形成したものである。In the case of Figure 3, as shown in (a) and (b), the wind tunnel 2
A plurality of sliding movable plates 5-1, 5-2, and 5-3 are provided on the side wall 1A of the duct 1 forming the duct 1,
The respective movable plates 5-1.5-L5-2.5-3 are rotated in the direction of arrow C to actually open the resonance chambers 4-1 and 4-2.
, 4-3 is formed so that the size of the communication hole communicating with it can be changed.
この場合、可動板５−１ 、５−１ 、５−２．５−３
のそれぞれに貫通穴５Ａが設けられ、共鳴室４−１．４
−２．４−３に設けられた連通穴１Ｂに対応し、（ｂ）
のＤ−Ｄ断面図である（ｃ）に示すように、可動板５−
１．５−１．５−２．５−３の爪部８が外壁６を挟持す
るように形成されているため、それぞれの可動板５−１
、５−１ 、５−２ 、５−３は個々に回動させ、そ
れぞれの共鳴室４−Ｌ４−２．４−３に連通ずる実際の
連通穴の断面積Ｓを大きく、または、小さくすることを
前述と同様に行うことができる。In this case, movable plates 5-1, 5-1, 5-2, 5-3
A through hole 5A is provided in each of the resonance chambers 4-1.4 and 4-1.4.
-2. Corresponding to the communication hole 1B provided in 4-3, (b)
As shown in (c), which is a DD cross-sectional view, the movable plate 5-
Since the claw portions 8 of 1.5-1.5-2.5-3 are formed to sandwich the outer wall 6, each movable plate 5-1
, 5-1, 5-2, and 5-3 are rotated individually to increase or decrease the cross-sectional area S of the actual communication hole communicating with each resonance chamber 4-L4-2.4-3. This can be done in the same way as described above.
したがって、前述のような騒音の周波数の範囲が広い場
合は、可、動板５−１．５−１．５−２．５−３のずれ
を個々に変えることで、それぞれの共鳴室４−１．４−
２゜４−３に対する共鳴周波数が異なるように調整する
ことができ、また、予め想定した騒音の周波数と実際の
周波数がズした場合であっても所定の消音特性を得るこ
とができる。Therefore, when the frequency range of the noise is wide as described above, by individually changing the displacement of the movable plates 5-1.5-1.5-2.5-3, each resonance chamber 4- 1.4-
The resonance frequency for 2°4-3 can be adjusted to be different, and even if the actual frequency differs from the predetermined noise frequency, a predetermined silencing characteristic can be obtained.
（発明の効果〕
以上説明したように、本発明によれば、貫通穴が設けら
れた可動部材または可動板を回動させることで風洞に連
通したそれぞれの共鳴室の共鳴周波数を変動させ、所定
の騒音に対する消音特性を得ることができる。(Effects of the Invention) As explained above, according to the present invention, by rotating a movable member or a movable plate provided with a through hole, the resonance frequency of each resonance chamber communicating with the wind tunnel is varied, and a predetermined value is obtained. It is possible to obtain silencing characteristics against noise.
したがって、従来のような共鳴室の容積を変動させる場
合に比べ、構成が筒素化および小型化が図れ、安価に製
作することができ、実用的効果は大である。Therefore, compared to the conventional case in which the volume of the resonance chamber is varied, the structure can be made cylindrical and compact, and can be manufactured at low cost, which has great practical effects.
第１図は本発明の原理説明図。
第２図は本考案による一実施例の説明図で、（ａ）は斜
視図、（ｂ）は正面図、（Ｃ）は側面断面図。
第３図は本発明の他の実施例の説明図で（ａ）は斜視図
、（ｂ）は正面図、（Ｃ）は側面断面図。
第４図は従来の説明図で、（ａ） （ｂ）は側面断面図
。
（ｃ）は音圧と周波数の関係グラフを示す。
図において、
１はダクト、 ２は風洞。
３はボックス、 ４は共鳴室。
５は可動部材、 １Ａは側壁。
１Ｂは連通穴、 ５Ａは貫通穴を示す。
＄ ２ 凶
１Ｂ違通穴
（ｂン （Ｃ
ン技−の化の大旌例の灰−図
第 ３ 図
（ｂン
第４図FIG. 1 is a diagram explaining the principle of the present invention. FIG. 2 is an explanatory view of one embodiment of the present invention, in which (a) is a perspective view, (b) is a front view, and (C) is a side sectional view. FIG. 3 is an explanatory view of another embodiment of the present invention, in which (a) is a perspective view, (b) is a front view, and (C) is a side sectional view. FIG. 4 is an explanatory diagram of the conventional technology, and (a) and (b) are side sectional views. (c) shows a graph of the relationship between sound pressure and frequency. In the figure, 1 is the duct and 2 is the wind tunnel. 3 is a box, 4 is a resonance chamber. 5 is a movable member, 1A is a side wall. 1B indicates a communicating hole, and 5A indicates a through hole. $ 2 Aku 1B through hole (b) (C
Fig. 3 (Fig. 4)
Claims (1)
ダクト（１）と、該ダクト（１）の側壁（１Ａ）に設け
られた連通穴（１Ｂ）に固着され、所定の体積の空洞と
なる共鳴室（４）を形成するボックス（３）とを備え、
該風洞（２）と該共鳴室（４）とを連通させることで該
風洞（２）に送出される騒音の消音を行う消音器におい
て、 前記連通穴（１Ｂ）に重ねられる貫通穴（５Ａ）を有し
、前記側壁（１Ａ）に沿ってスライドされ、前記風洞（
２）と前記共鳴室（４）とを連通する穴の断面積を変え
る可動部材（５）が具備されて成ることを特徴とする消
音器。[Scope of Claims] A duct (1) forming a wind tunnel (2) that guides air from one side to the other, and a communication hole (1B) provided in a side wall (1A) of the duct (1), A box (3) forming a resonance chamber (4) that is a cavity with a predetermined volume,
In a silencer that muffles noise sent to the wind tunnel (2) by communicating the wind tunnel (2) and the resonance chamber (4), a through hole (5A) overlapped with the communication hole (1B). is slid along the side wall (1A), and the wind tunnel (
2) and the resonance chamber (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62333863A JPH01169194A (en) | 1987-12-24 | 1987-12-24 | Silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62333863A JPH01169194A (en) | 1987-12-24 | 1987-12-24 | Silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01169194A true JPH01169194A (en) | 1989-07-04 |
Family
ID=18270788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62333863A Pending JPH01169194A (en) | 1987-12-24 | 1987-12-24 | Silencer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01169194A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0883038A (en) * | 1994-09-13 | 1996-03-26 | Ricoh Co Ltd | Silencer |
| WO2004061817A1 (en) * | 2002-12-26 | 2004-07-22 | Fujitsu Limited | Silencer and electronic equipment |
| JP2009231463A (en) * | 2008-03-21 | 2009-10-08 | Hitachi Ltd | Silencing mechanism for electronic device and silencer |
| JP2010087174A (en) * | 2008-09-30 | 2010-04-15 | Hitachi Ltd | Silencer for electronic equipment |
| JP2010271543A (en) * | 2009-05-21 | 2010-12-02 | Yamaha Corp | Acoustic structure |
| US7891464B2 (en) * | 2006-06-15 | 2011-02-22 | Hewlett-Packard Development, L.P. | System and method for noise suppression |
| JP2014080869A (en) * | 2012-10-12 | 2014-05-08 | Mitsubishi Heavy Ind Ltd | Silencer |
| KR20180064887A (en) * | 2016-12-06 | 2018-06-15 | 현대자동차주식회사 | Resonator of frequency variable type |
| US20200045845A1 (en) * | 2018-08-01 | 2020-02-06 | Winstron Corp. | Fan system and sound suppression method thereof |
| CN112303033A (en) * | 2020-11-03 | 2021-02-02 | 江苏科技大学 | Sleeve type Helmholtz resonance silencer with small length-diameter ratio and silencing method thereof |
| CN113464758A (en) * | 2021-07-08 | 2021-10-01 | 广西科技大学 | Expansion silencer structure capable of adjusting perforation rate |
| CN113531268A (en) * | 2021-07-08 | 2021-10-22 | 广西科技大学 | Reactive muffler structure of adjustable perforation rate |
-
1987
- 1987-12-24 JP JP62333863A patent/JPH01169194A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0883038A (en) * | 1994-09-13 | 1996-03-26 | Ricoh Co Ltd | Silencer |
| WO2004061817A1 (en) * | 2002-12-26 | 2004-07-22 | Fujitsu Limited | Silencer and electronic equipment |
| US7891464B2 (en) * | 2006-06-15 | 2011-02-22 | Hewlett-Packard Development, L.P. | System and method for noise suppression |
| JP2009231463A (en) * | 2008-03-21 | 2009-10-08 | Hitachi Ltd | Silencing mechanism for electronic device and silencer |
| US8485310B2 (en) | 2008-09-30 | 2013-07-16 | Hitachi, Ltd. | Silencing equipment for electric devices |
| JP2010087174A (en) * | 2008-09-30 | 2010-04-15 | Hitachi Ltd | Silencer for electronic equipment |
| JP2010271543A (en) * | 2009-05-21 | 2010-12-02 | Yamaha Corp | Acoustic structure |
| JP2014080869A (en) * | 2012-10-12 | 2014-05-08 | Mitsubishi Heavy Ind Ltd | Silencer |
| KR20180064887A (en) * | 2016-12-06 | 2018-06-15 | 현대자동차주식회사 | Resonator of frequency variable type |
| US20200045845A1 (en) * | 2018-08-01 | 2020-02-06 | Winstron Corp. | Fan system and sound suppression method thereof |
| CN110792619A (en) * | 2018-08-01 | 2020-02-14 | 纬创资通股份有限公司 | Fan system and sound suppression method thereof |
| TWI705188B (en) * | 2018-08-01 | 2020-09-21 | 緯創資通股份有限公司 | Fan system and sound suppression method thereof |
| CN112303033A (en) * | 2020-11-03 | 2021-02-02 | 江苏科技大学 | Sleeve type Helmholtz resonance silencer with small length-diameter ratio and silencing method thereof |
| CN113464758A (en) * | 2021-07-08 | 2021-10-01 | 广西科技大学 | Expansion silencer structure capable of adjusting perforation rate |
| CN113531268A (en) * | 2021-07-08 | 2021-10-22 | 广西科技大学 | Reactive muffler structure of adjustable perforation rate |
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