JPS5924246B2 - Silencer - Google Patents

Description

【発明の詳細な説明】 従来の排気ガス、通風ガス、空調用空気等の騒音を減少
させる消音器としては広い室に多数の小孔を有する管で
連結した迂回式の構造のものがあったが、これによると
複雑な通路を通る間に音波干渉によって騒音は減衰する
が気流の通路抵抗が大きくなるという欠点があった。[Detailed Description of the Invention] Conventional silencers for reducing the noise of exhaust gas, ventilation gas, air conditioning air, etc. have a bypass type structure in which a large chamber is connected by a pipe having a large number of small holes. However, this method has the disadvantage that although the noise is attenuated by sound wave interference while the airflow passes through a complicated passage, the passage resistance of the airflow increases.

更に迂回路の路壁に消音材を装着して長い迂回路中にお
いて消音材で消音するサイレンサーが特公昭４９−４３
８４３号公報で知られているが消音材による消音では消
音効果が不充分であり、又消音材の装着のためコスト高
になるといった欠点があった。In addition, a silencer was developed in 1977-43 that silenced sound by attaching sound-deadening material to the wall of the detour and used the material to muffle noise during long detours.
Although it is known from Japanese Patent No. 843, the noise reduction effect is insufficient when using a sound deadening material, and the cost is high due to the installation of the sound deadening material.

本発明はこの欠点を除去し、通路抵抗が小さくて消音効
果が優れた消音器を提供せんとするものである。The present invention aims to eliminate this drawback and provide a muffler with low passage resistance and excellent muffling effect.

この発明は、末端を閉塞した排気用管体１の外周に同管
体と同志に環状隔室２．２′・・・を多重に設けると共
に、管体１及び隔室２，２′・・・の中心に対し交互に
反対方向の隔室壁面又は管体壁面の一部に孔又はスリッ
ト等の通気窓３．３′・・・を設けてなる消音器に係る
ものである。This invention provides a plurality of annular compartments 2, 2', . This relates to a silencer in which ventilation windows 3, 3', such as holes or slits, are provided alternately in parts of the wall of the compartment or the wall of the tube body in opposite directions with respect to the center of the silencer.

なお図中、４は入気孔、５，５・・・は隔室２，２′・
・・を区切る外周壁である。In the figure, 4 is the inlet hole, 5, 5... are the compartments 2, 2',
It is the outer peripheral wall that separates...

この発明では入気孔４から排気用管体１に入った気流は
隔室２，２′・・・の多数の孔又はスリット等からなる
通気窓２，２′・・・を経て大気（外部）に排気される
ものであるが、通気窓２，２′・・・は交互に反対方向
の位置にあるため、通気窓３を通過した気流に含まれる
音波は隔室２を三方に分れて迂回し、通気窓３の反対位
置に到達するか三方に分れた音波同志が強い音波干渉を
起し、かなりの音波の強さを減衰させることができ、更
に減衰した音波が通気窓３′から三方に分れ、通気窓３
３〃に到達すれば又そこで同様に音波干渉が起って減衰
してゆくもので、これを多重の隔室２，２′・・・の数
だけくりかえすことで大巾に音波（騒音）を減少させる
ことができるものである（第４図参照）。In this invention, the airflow that enters the exhaust pipe body 1 from the inlet hole 4 passes through the ventilation windows 2, 2', which are composed of numerous holes or slits, etc. in the compartments 2, 2', and then reaches the atmosphere (outside). However, since the ventilation windows 2, 2', etc. are alternately located in opposite directions, the sound waves contained in the airflow that has passed through the ventilation window 3 are divided into three sides of the compartment 2. The sound waves that take a detour and reach the opposite position of the ventilation window 3 or are split into three directions cause strong sound wave interference, which can significantly attenuate the strength of the sound waves, and the further attenuated sound waves reach the position opposite the ventilation window 3'. Divided into three sides, ventilation window 3
When reaching 3, the same sound wave interference occurs and attenuates. By repeating this as many times as there are multiple compartments 2, 2', etc., the sound waves (noise) can be spread out over a wide area. (See Figure 4).

この場合気流の抵抗は管体１の有効通風面積と等しい程
度の通気窓３，３′・・・の有効通風面積及び隔室２，
２′・・・の有効流路面積を確保すれば大きいものとは
ならない。In this case, the airflow resistance is the effective ventilation area of the ventilation windows 3, 3', which is equal to the effective ventilation area of the tube body 1, and the effective ventilation area of the compartments 2, 3', etc.
If the effective flow path area of 2'... is ensured, it will not be large.

従って第２，３図で明示する様に、隔室２，２′・・・
の壁間距離及び通気窓３．３′・・・の隔室２．２′・
・・の外周壁長さに対する比率を外方に従って小さくす
ることができる。Therefore, as clearly shown in Figures 2 and 3, compartments 2, 2'...
Inter-wall distance and ventilation windows 3.3'... compartments 2.2'.
The ratio of ... to the length of the outer peripheral wall can be made smaller toward the outside.

通気窓３，３′・・・とじては第１〜３図に示す様に多
数の孔で形成してもよく、又スリット状のものでも、あ
るいは単に開口させるだけでもよい。The ventilation windows 3, 3'...may be formed with a large number of holes as shown in FIGS. 1 to 3, or may be formed in the form of slits, or may be simply opened.

従って、本発明によれば環状隔室２．２′・・・と交互
に反対位置にある通気窓３，３′・・・とによって通路
抵抗を小さく抑えながら、しかも大きな消音効果を有し
、更には環状隔室２，２′・・・を多重としているのみ
の簡単な構造でコンパクトにできるという効果もある。Therefore, according to the present invention, the annular compartments 2, 2'... and the ventilation windows 3, 3', which are alternately located in opposite positions, can suppress the passage resistance to a low level while achieving a large sound-dampening effect. Furthermore, there is also the effect that the annular compartments 2, 2', .

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

第１図は本発明消音器の実施例を示す正面図、第２図は
第１図Ｉ−Ｉ線における横断平面図、第３図は第１図［
−１１線における縦断側面図、第４図は音波の伝播状態
を示す説明図である。 １：排気用管体、２，２′・・−：環状隔室、３゜３′
・・・二通気窓、４：人気口、５．５′・・・：外周壁
。FIG. 1 is a front view showing an embodiment of the silencer of the present invention, FIG. 2 is a cross-sectional plan view taken along line I-I in FIG.
FIG. 4, a vertical side view taken along the line -11, is an explanatory diagram showing the propagation state of sound waves. 1: Exhaust pipe body, 2, 2'...-: Annular compartment, 3゜3'
...Two ventilation windows, 4: Popular port, 5.5'...: Peripheral wall.

Claims (1)

【特許請求の範囲】[Claims] １ 末端を閉塞した排気用管体１の外周に同管体と同志
に環状隔室２，２′・・・を多重に設けると共に、管体
１及び隔室２．２′・・・の中心に対し交互に反対方向
の隔室壁面又は管体壁面の一部に孔又はスリット等の通
気窓３，３′・・・を設けてなる消音器。1. On the outer periphery of the exhaust tube 1 with its end closed, annular compartments 2, 2', etc. are provided in multiple layers along with the same tube, and the center of the tube 1 and the compartments 2, 2', etc. A silencer in which ventilation windows 3, 3', etc., such as holes or slits, are provided alternately on a part of the wall of the compartment or the wall of the tube body in opposite directions.