JPH0622732U - Silencer for combustor - Google Patents

Silencer for combustor

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Publication number
JPH0622732U
JPH0622732U JP5608492U JP5608492U JPH0622732U JP H0622732 U JPH0622732 U JP H0622732U JP 5608492 U JP5608492 U JP 5608492U JP 5608492 U JP5608492 U JP 5608492U JP H0622732 U JPH0622732 U JP H0622732U
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JP
Japan
Prior art keywords
exhaust passage
silencer
combustor
gap
outer case
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
Application number
JP5608492U
Other languages
Japanese (ja)
Inventor
照夫 岡野
Original Assignee
ニベックス株式会社
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Publication date
Application filed by ニベックス株式会社 filed Critical ニベックス株式会社
Priority to JP5608492U priority Critical patent/JPH0622732U/en
Publication of JPH0622732U publication Critical patent/JPH0622732U/en
Pending legal-status Critical Current

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Abstract

(57)【要約】 【目的】 燃焼音は勿論のこと衝撃的な爆燃音を効果的
に消音できる燃焼機用消音器を提供すること。 【構成】 燃焼機の燃焼室排気口に接続される消音器
を、入口1c及び出口1dを有する外ケ−ス1と、外ケ
−ス1の間に間隙kを形成しつつ外ケ−ス1内に排気通
路2bを形成する内ケ−ス2と、内ケ−ス2の排気通路
面に形成された多数の小穴2cと、上記間隙Kに充填配
置された繊維状物3と、通気性及び可撓性を有し上記排
気通路2bに配置された隔壁板4,5,6とから構成し
ているので、爆燃音のような衝撃的な音波を隔壁板の撓
みによる緩衝作用で効果的に消音することができる。
(57) [Abstract] [Purpose] To provide a silencer for a combustor that can effectively muffle not only combustion noise but also shocking deflagration noise. A silencer connected to an exhaust port of a combustion chamber of a combustor is provided with an outer case 1 having an inlet 1c and an outlet 1d, and a gap k is formed between the outer case 1 and the outer case. 1, an inner casing 2 forming an exhaust passage 2b, a large number of small holes 2c formed in the exhaust passage surface of the inner casing 2, a fibrous material 3 arranged in the gap K, and ventilation. Since it is composed of the partition plates 4, 5 and 6 which have flexibility and flexibility and are arranged in the exhaust passage 2b, the shock absorbing sound such as deflagration sound is effectively buffered by the bending of the partition plate. Can be silenced automatically.

Description

【考案の詳細な説明】[Detailed description of the device]

【0001】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、給湯機,ボイラ−,暖房機等の各種燃焼機に有用な消音器に関する ものである。 The present invention relates to a silencer useful for various combustors such as water heaters, boilers, and heaters.

【0002】[0002]

【従来の技術】[Prior art]

図4には従来の給湯機を示してある。同図において、21は給湯機本体、22 は給湯機本体21内に配置された燃焼室、23は燃焼室22の下部に横向き姿勢 で配設されたバ−ナ、24は燃焼室22の上部から本体上面に延設された排気口 、25は給水口、26は給湯口、27は排気口24に接続された消音器である。 FIG. 4 shows a conventional water heater. In the figure, 21 is a water heater main body, 22 is a combustion chamber arranged in the water heater main body 21, 23 is a burner horizontally arranged below the combustion chamber 22, and 24 is an upper portion of the combustion chamber 22. Is a water outlet, 25 is a water inlet, 26 is a hot water inlet, and 27 is a silencer connected to the exhaust outlet 24.

【0003】 燃焼室22の周囲及び内部には熱交換パイプ(図示省略)が配設され、該熱交 換パイプは給水口25及び給湯口26に接続されている。A heat exchange pipe (not shown) is arranged around and inside the combustion chamber 22, and the heat exchange pipe is connected to a water supply port 25 and a hot water supply port 26.

【0004】 消音器27は、上端閉塞の外筒27aと、外筒27a内に該外筒27aと間隙 を介して配置された内筒27bと、両筒の間隙に充填配置されたグラスウ−ルや フェルト等の繊維状物27cとから成り、外筒27aの下端には入口27dが、 また上部周面には出口27eが夫々設けられている。また、内筒27bの内側は 排気通路27fとして形成され、該排気通路面には多数の小穴27gが形成され ている。The muffler 27 includes an outer cylinder 27a having an upper end closed, an inner cylinder 27b arranged in the outer cylinder 27a with a gap between the outer cylinder 27a, and a glass wall filled in a gap between the two cylinders. The outer cylinder 27a is provided with an inlet 27d at the lower end and an upper peripheral surface with an outlet 27e, respectively. Further, the inside of the inner cylinder 27b is formed as an exhaust passage 27f, and a large number of small holes 27g are formed in the exhaust passage surface.

【0005】 上記の給湯機では、バ−ナ23の火炎を燃焼室22内で形成し給水口25に水 を送り込むことで、燃焼熱を利用して熱交換パイプで水を加温し給湯口26から 送り出すことができる。また、燃焼時の排気を消音器27の排気通路27fを通 じて出口27eから排出できると共に、燃焼音を小穴27gから繊維状物27c 側に導いて消音できるようになっている。In the above water heater, the flame of the burner 23 is formed in the combustion chamber 22 and the water is sent to the water supply port 25, so that the heat of combustion is used to heat the water with the heat exchange pipe. It can be sent out from 26. Further, the exhaust gas at the time of combustion can be discharged from the outlet 27e through the exhaust passage 27f of the muffler 27, and the combustion sound can be muffled from the small hole 27g to the fibrous material 27c side.

【0006】[0006]

【考案が解決しようとする課題】 ところで上述の消音器27では、多数の小穴27g及び間隙による共鳴吸収作 用と、繊維状物27cによる吸音作用によって消音を行なうようにしているが、 バ−ナ着火時に生じる衝撃的な爆燃音を消音するには十分なものとは言えず、着 火の度に爆燃音が外部に漏れて騒音となる難点がある。In the muffler 27 described above, the sound absorption is performed by the resonance absorption operation by the many small holes 27g and the gaps and the sound absorption effect by the fibrous material 27c. It is not enough to mitigate the shocking deflagration sound generated at ignition, and there is a problem that the detonation sound leaks to the outside at every ignition and becomes a noise.

【0007】 本考案は上記事情に鑑みてなされたもので、燃焼音は勿論のこと衝撃的な爆燃 音を効果的に消音できる燃焼機用消音器を提供することにある。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a silencer for a combustion machine that can effectively muffle not only combustion noise but also shocking detonation noise.

【0008】[0008]

【課題を解決するための手段】[Means for Solving the Problems]

上記目的を達成するため請求項1では、燃焼機の燃焼室排気口に接続される消 音器を、入口及び出口を有する外ケ−スと、外ケ−スとの間に間隙を形成しつつ 外ケ−ス内に排気通路を形成する内ケ−スと、内ケ−スの排気通路面に形成され た多数の小穴と、上記間隙に充填配置された繊維状物と、通気性及び可撓性を有 し上記排気通路に配置された隔壁板とから構成している。 In order to achieve the above object, in claim 1, a silencer connected to a combustion chamber exhaust port of a combustor is provided with a gap formed between an outer case having an inlet and an outlet and the outer case. Meanwhile, the inner case forming an exhaust passage in the outer case, a large number of small holes formed in the exhaust passage surface of the inner case, the fibrous material filled and arranged in the gap, and the air permeability and The partition plate is flexible and is arranged in the exhaust passage.

【0009】 請求項2では、請求項1記載の燃焼機用消音器において、隔壁板に排気通路よ りも小さな通穴を夫々設けている。According to a second aspect, in the muffler for a combustor according to the first aspect, the partition plate is provided with through holes each smaller than the exhaust passage.

【0010】 請求項3では、請求項2記載の燃焼機用消音器において、隔壁板を間隔をおい て複数配置し、隣接する隔壁板の通穴位置を排気通路と直交する方向で異ならせ ている。According to a third aspect of the present invention, in the muffler for a combustor according to the second aspect, a plurality of partition plates are arranged at intervals, and the positions of the through holes of the adjacent partition plates are different in the direction orthogonal to the exhaust passage. There is.

【0011】[0011]

【作用】[Action]

請求項1に係る消音器はその入口を燃焼機の燃焼室排気口に接続して使用され る。この消音器では、外ケ−スと内ケ−スとの間に間隙(空気層)を形成し、内 ケ−スの排気通路面に多数の小穴を形成することにより、該間隙及び小穴で共鳴 吸収作用を発揮させることができ、また間隙内に充填配置された繊維状物で吸音 作用を発揮させて消音を行なえる。 The silencer according to claim 1 is used with its inlet connected to the combustion chamber exhaust port of the combustor. In this silencer, a gap (air layer) is formed between the outer case and the inner case, and a large number of small holes are formed on the exhaust passage surface of the inner case, so that the gap and the small holes are formed. The resonance absorption function can be exerted, and the fibrous material filled and arranged in the gap exerts a sound absorption function to muffle sound.

【0012】 また、可撓性を有する隔壁板を排気通路に配置することにより、爆燃音のよう な衝撃的な音波を隔壁板の撓みによる緩衝作用で消音することが可能である。し かも、隔壁板には通気性を付与してあるので該隔壁板によって排気を流れが妨げ られることもない。Further, by disposing a partition wall plate having flexibility in the exhaust passage, it is possible to muffle a shocking sound wave such as detonation sound by a buffering action due to the bending of the partition wall plate. However, since the partition plate is provided with air permeability, the partition plate does not obstruct the flow of exhaust gas.

【0013】 請求項2に係る消音器では、排気通路に配置された隔壁板に排気通路よりも小 さな通穴を設けることにより、該通穴で拡散作用を発揮させて消音を行なえる。 請求項3に係る消音器では、隔壁板を間隔をおいて複数配置し、しかも隣接す る隔壁板の通穴位置を排気通路と直交する方向で異ならせることにより、上記の 拡散作用をより一層有効に発揮できる。In the muffler according to the second aspect, the partition plate disposed in the exhaust passage is provided with a through hole smaller than the exhaust passage, so that the through hole can exert a diffusing action to muffle the sound. In the muffler according to claim 3, a plurality of partition plates are arranged at intervals, and the positions of the through holes of the adjacent partition plates are made different in the direction orthogonal to the exhaust passage, so that the above diffusion action is further enhanced. It can be used effectively.

【0014】[0014]

【実施例】【Example】

図1及び図3は本考案の一実施例を示すもので、図1は消音器の断面図、図2 は図1のA−A線断面図、図3は隔壁板の上面図である。 1 and 3 show an embodiment of the present invention. FIG. 1 is a sectional view of a silencer, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a top view of a partition plate.

【0015】 同図において、1は円筒形状を成す金属製外筒で、円錐形状の膨出部1aを有 する蓋板1bによって上端開口を閉塞されている。この外筒1の下端は入口1c として開口しており、また外筒1の上部には楕円形状の出口1dが周方向に複数 個形成されている。In FIG. 1, reference numeral 1 denotes a cylindrical metal outer cylinder whose upper end opening is closed by a cover plate 1b having a conical bulge 1a. The lower end of the outer cylinder 1 is opened as an inlet 1c, and the upper part of the outer cylinder 1 is provided with a plurality of elliptical outlets 1d in the circumferential direction.

【0016】 2は外筒1よりも小径の円筒形状を成す金属製内筒で、上下端に外筒1の内径 と一致した鍔部2aを有している。この内筒2は各鍔部2aを外筒1内面に固着 され外筒1内の略中間部に配置されており、該内筒2と外筒1との間には環状の 間隙Kが形成されている。また、外筒1の内側は排気通路2bとして利用され、 また内筒2の排気通路面には多数の小穴2cが形成されている。Reference numeral 2 denotes a metal inner cylinder having a cylindrical shape having a smaller diameter than that of the outer cylinder 1, and has flange portions 2 a at the upper and lower ends, which are matched with the inner diameter of the outer cylinder 1. The inner cylinder 2 has each flange portion 2a fixed to the inner surface of the outer cylinder 1 and is arranged at a substantially middle portion in the outer cylinder 1. An annular gap K is formed between the inner cylinder 2 and the outer cylinder 1. Has been done. Further, the inside of the outer cylinder 1 is used as an exhaust passage 2b, and a large number of small holes 2c are formed in the exhaust passage surface of the inner cylinder 2.

【0017】 3は上記間隙に充填配置された繊維状物で、ここでは金属繊維、好ましくは耐 食性に優れたステンレス繊維やアルミニウム繊維が使用されている。金属繊維は 小穴2bよりも長い繊維を多数密集して充填する他、間隙寸法に合わせて予めウ ェブ状に加工されたものを配置するようにしてもよい。Reference numeral 3 is a fibrous material filled and arranged in the above-mentioned gap, and here, metal fiber, preferably stainless fiber or aluminum fiber having excellent corrosion resistance is used. The metal fibers may be densely packed with a large number of fibers longer than the small holes 2b, or may be preliminarily processed into a web shape in accordance with the gap size.

【0018】 4,5,6は排気通路2bに等間隔で配置された円形状の隔壁板で、通気性及 び可撓性を有する材料、ここでは上記同様の金属繊維を平板状に密集,成形し焼 結したものが使用されている。この隔壁板4,5,6は排気通路2bに設けられ た支持金具(図示省略)を介してその周縁を排気通路2bに固着されている。ま た、各隔壁板4,5,6には排気通路2bよりも小さな通穴4a,5a,6aが 夫々形成され、隣接する通穴位置は図3に示すように排気通路2bと直交する方 向で異なっている。尚、隔壁板4,5,6の実際の寸法は直径100mm,厚さ 5mm程度であり、通穴4a,5a,6aの直径25mm程度である。Numerals 4, 5 and 6 are circular partition plates arranged at equal intervals in the exhaust passage 2b, which is a material having air permeability and flexibility, here, metal fibers similar to the above are densely packed in a flat plate shape, It is used after being molded and baked. The partition plates 4, 5 and 6 are fixed at their peripheral edges to the exhaust passage 2b via a support fitting (not shown) provided in the exhaust passage 2b. Further, through holes 4a, 5a, 6a smaller than the exhaust passage 2b are formed in the respective partition plates 4, 5, 6 and the adjacent through holes are located at a position orthogonal to the exhaust passage 2b as shown in FIG. Different in different directions. The actual dimensions of the partition plates 4, 5, 6 are about 100 mm in diameter and about 5 mm in thickness, and the through holes 4a, 5a, 6a are about 25 mm in diameter.

【0019】 上述の消音器はその入口1cを給湯機等における燃焼室の排気口Hに接続して 使用される。燃焼時の排気は排気通路2bに配置された各隔壁板4,5,6の通 穴4a,5a,6a及び通気性を有する他の部分を通じて出口1dから排出され る。The muffler described above is used with its inlet 1c connected to an exhaust port H of a combustion chamber in a water heater or the like. Exhaust gas at the time of combustion is discharged from the outlet 1d through the through holes 4a, 5a, 6a of the partition plates 4, 5, 6 arranged in the exhaust passage 2b and other portions having air permeability.

【0020】 この消音器では、外筒1と内筒2との間に間隙K(空気層)を形成し、内筒2 の排気通路面に多数の小穴2cを形成してあるので、該間隙K及び小穴2cで共 鳴吸収作用を発揮させることができ、また間隙K内に充填配置された繊維状物3 で吸音作用を発揮させて、低・中音域に当たる燃焼音の消音を効果的に行なうこ とができる。In this silencer, a gap K (air layer) is formed between the outer cylinder 1 and the inner cylinder 2, and a large number of small holes 2c are formed in the exhaust passage surface of the inner cylinder 2, so K and the small holes 2c can exhibit a sound absorbing effect, and the fibrous material 3 filled in the gap K can exhibit a sound absorbing effect to effectively muff out the combustion sound in the low and middle sound range. I can do it.

【0021】 また、排気通路2bに配置された各隔壁板4,5,6に排気通路2bよりも小 さな通穴4a,5a,6aを夫々設けてあるので、該通穴4a,5a,6aで拡 散作用を発揮させて同上の燃焼音の消音を効果的に行なうことができる。しかも 、隣接する隔壁板4,5,6の通穴位置を排気通路2bと直交する方向で異なら せてあるので、上記の拡散作用をより一層有効に発揮させて消音を行なえる利点 がある。Further, since the partition plates 4, 5, 6 arranged in the exhaust passage 2b are provided with through holes 4a, 5a, 6a smaller than the exhaust passage 2b, the through holes 4a, 5a, By 6a, the diffusion effect can be exerted to effectively muffle the combustion noise. Moreover, since the positions of the through holes of the adjacent partition plates 4, 5, 6 are made different in the direction orthogonal to the exhaust passage 2b, there is an advantage that the above-mentioned diffusion action can be more effectively exhibited and the noise can be suppressed.

【0022】 さらに、バ−ナ着火時に衝撃的な爆燃音を生じた場合には、排気通路2bに配 置された各隔壁板4,5,6が上方に撓み、該撓みによる緩衝作用でこれを効果 的に消音することが可能である。バ−ナの種類によっては消火後に残油の気化を 原因として着火時と同様の爆燃を生じる場合もあるが、この場合も同作用によっ て消音を行なえることできる。Further, when a shocking detonation noise is generated when the burner is ignited, the partition plates 4, 5, 6 arranged in the exhaust passage 2b are bent upward, and this is caused by the buffering action due to the bending. Can be effectively muted. Depending on the type of burner, the same detonation as at the time of ignition may occur due to vaporization of residual oil after extinguishing the fire. In this case, the same effect can also be used to muffle noise.

【0023】 尚、上述の実施例では、消音器を給湯機等に外部接続したものを示したが、燃 焼室の上部に消音器を連設して該消音器を燃焼機本体に内蔵するようにしてもよ い。また、消音器を円筒状に形成したもの示したが、該消音器の形状は適用する 燃焼機に合わせて角筒状や箱状等に変更してもよく、また排気通路を蛇行させる ことも可能である。さらに、隔壁板を複数配置したものを示したが、隔壁板は少 なくとも1個あれば爆燃音の消音に効果を発揮することができ、また隔壁板自体 が通気性を有することから排気上において通穴は必ずしも必要なものではない。 さらにまた、間隙に充填配置される繊維状物は従来と同様のグラスウ−ルやフェ ルト等であってもよい。Although the silencer is externally connected to the water heater or the like in the above-described embodiment, the silencer is connected to the upper part of the combustion chamber and the silencer is built in the main body of the combustor. You can do it. Also, although the silencer formed in a cylindrical shape is shown, the shape of the silencer may be changed to a rectangular tube shape, a box shape, or the like according to the applied combustor, and the exhaust passage may be made to meander. It is possible. Furthermore, although a plurality of partition plates are shown, if there is at least one partition plate, it can be effective in silencing deflagration noise, and since the partition plate itself has air permeability, it does not affect the exhaust gas. Through holes are not always necessary. Further, the fibrous material filled and arranged in the gap may be the same glass wool or felt as in the conventional case.

【0024】[0024]

【考案の効果】[Effect of device]

以上詳述したように、請求項1に係る消音器によれば、可撓性を有する隔壁板 を排気通路に配置することで、爆燃音のような衝撃的な音波を隔壁板の撓みによ る緩衝作用で効果的に消音することが可能であり、燃焼音に加え爆燃音も的確に 消音して静寂な燃焼を期待できる。 As described above in detail, according to the muffler of the first aspect, by disposing the partition wall plate having flexibility in the exhaust passage, a shocking sound wave such as deflagration sound is generated by the bending of the partition plate. It is possible to effectively muffle the sound by the buffering effect, and it is possible to accurately mute the detonation sound in addition to the combustion sound, and expect quiet combustion.

【0025】 また、請求項2に係る消音器によれば、排気通路に配置された隔壁板に排気通 路よりも小さな通穴を設けることで、該通穴で拡散作用を発揮させて燃焼音の消 音をより確実に行なえる。According to the muffler of the second aspect, the partition plate arranged in the exhaust passage is provided with a through hole smaller than the exhaust passage, so that the through hole exerts a diffusion action to generate combustion noise. Can be more reliably muted.

【0026】 請求項3に係る消音器では、隣接する隔壁板の通穴位置を排気通路と直交する 方向で異ならせることで、上記の拡散作用をより一層有効に発揮させて消音を確 実に行なえる。In the silencer according to the third aspect of the present invention, the positions of the through holes of the adjacent partition plates are made different in the direction orthogonal to the exhaust passage, so that the above diffusion effect can be more effectively exerted and the sound can be reliably eliminated. It

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

【図1】本考案の一実施例を示す消音器の断面図FIG. 1 is a sectional view of a silencer showing an embodiment of the present invention.

【図2】図1のA−A線断面図FIG. 2 is a sectional view taken along line AA of FIG.

【図3】隔壁板の上面図FIG. 3 is a top view of a partition plate.

【図4】従来例を示す給湯機の一部破断側面図FIG. 4 is a partially cutaway side view of a water heater showing a conventional example.

【符号の説明】[Explanation of symbols]

1…外筒、1c…入口、1d…出口、2…内筒、2b…
排気通路、2c…小穴、K…間隙、3…繊維状物、4,
5,6…隔壁板、4a,5a,6a…通穴。
1 ... Outer cylinder, 1c ... Inlet, 1d ... Outlet, 2 ... Inner cylinder, 2b ...
Exhaust passage, 2c ... small hole, K ... gap, 3 ... fibrous material, 4,
5, 6 ... Partition plates, 4a, 5a, 6a ... Through holes.

Claims (3)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】 燃焼機の燃焼室排気口に接続される消音
器であって、 入口及び出口を有する外ケ−スと、 外ケ−スとの間に間隙を形成しつつ外ケ−ス内に排気通
路を形成する内ケ−スと、 内ケ−スの排気通路面に形成された多数の小穴と、 上記間隙に充填配置された繊維状物と、 通気性及び可撓性を有し上記排気通路に配置された隔壁
板とから成る、 ことを特徴とする燃焼機用消音器。
1. A silencer connected to a combustion chamber exhaust port of a combustor, wherein an outer case having an inlet and an outlet, and an outer case forming a gap between the outer case and the outer case. An inner case forming an exhaust passage therein, a large number of small holes formed in the exhaust passage surface of the inner case, a fibrous material filled and arranged in the gap, and having air permeability and flexibility. A silencer for a combustor, comprising a partition plate disposed in the exhaust passage.
【請求項2】 隔壁板に排気通路よりも小さな通穴を設
けた、ことを特徴とする請求項1記載の燃焼機用消音
器。
2. The silencer for a combustor according to claim 1, wherein the partition plate has a through hole smaller than the exhaust passage.
【請求項3】 隔壁板を間隔をおいて複数配置し、隣接
する隔壁板の通穴位置を排気通路と直交する方向で異な
らせた、ことを特徴とする請求項2記載の燃焼機用消音
器。
3. The muffler for a combustor according to claim 2, wherein a plurality of partition plates are arranged at intervals, and the positions of the through holes of the adjacent partition plates are different in the direction orthogonal to the exhaust passage. vessel.
JP5608492U 1992-08-10 1992-08-10 Silencer for combustor Pending JPH0622732U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5608492U JPH0622732U (en) 1992-08-10 1992-08-10 Silencer for combustor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5608492U JPH0622732U (en) 1992-08-10 1992-08-10 Silencer for combustor

Publications (1)

Publication Number Publication Date
JPH0622732U true JPH0622732U (en) 1994-03-25

Family

ID=13017226

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5608492U Pending JPH0622732U (en) 1992-08-10 1992-08-10 Silencer for combustor

Country Status (1)

Country Link
JP (1) JPH0622732U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100368711B1 (en) * 1999-11-15 2003-01-24 차승식 Reduction device of exhaust noise in a one body type air conditioner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0252916A (en) * 1988-08-17 1990-02-22 Matsushita Electric Ind Co Ltd gas water heater

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0252916A (en) * 1988-08-17 1990-02-22 Matsushita Electric Ind Co Ltd gas water heater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100368711B1 (en) * 1999-11-15 2003-01-24 차승식 Reduction device of exhaust noise in a one body type air conditioner

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