JPH0421088B2 - - Google Patents
Info
- Publication number
- JPH0421088B2 JPH0421088B2 JP59070284A JP7028484A JPH0421088B2 JP H0421088 B2 JPH0421088 B2 JP H0421088B2 JP 59070284 A JP59070284 A JP 59070284A JP 7028484 A JP7028484 A JP 7028484A JP H0421088 B2 JPH0421088 B2 JP H0421088B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- sound
- air supply
- air
- supply path
- 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 - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 claims description 27
- 239000011358 absorbing material Substances 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 5
- 239000011800 void material Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 208000002193 Pain Diseases 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000036407 pain Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C15/00—Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/02—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in parallel arrangement
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明はパルス燃焼器に関するものである。[Detailed description of the invention] Industrial applications The present invention relates to a pulse combustor.
従来例の構成とその問題点
パルス燃焼器は始動時に燃料ガスと送風フアン
により燃焼用空気を燃焼室に供給させ、点火プラ
グを作動させることにより強制的に燃焼を行わせ
る。ひとたび系が安定して燃焼サイクルを形成す
ると、点火プラグや送風フアンを停止しても、燃
焼用空気を自動吸引し、自己着火により数十〜数
百ヘルツの一定周波数でパルス燃焼を継続する。Conventional Structure and Problems When a pulse combustor is started, combustion air is supplied to the combustion chamber using fuel gas and a blower fan, and combustion is forced by operating a spark plug. Once the system stabilizes and forms a combustion cycle, combustion air is automatically sucked in and self-ignition continues pulsed combustion at a constant frequency of tens to hundreds of hertz even when the spark plugs and blower fan are stopped.
このようなパルス燃焼器は高負荷で燃焼し、熱
伝達特性がよく、始動時を除けば着火や給排気を
自動で行い、構造が簡単であるなどの利点があ
る。 Such a pulse combustor burns under high load, has good heat transfer characteristics, automatically performs ignition and air supply/exhaust except during startup, and has the advantages of a simple structure.
しかしながら、パルス燃焼器は燃焼時の騒音が
大きいという問題があつた。このためにマフラを
装着することが行われているが、マフラを装着す
ると音響インピーダンスが変わるために、燃焼サ
イクルの基本周波数が変わることがある。このた
めに折角装着したマフラが思つたほど効果が上が
らないことが多い。そこで空気パルブ装置を空気
クツシヨンチヤンバで囲み、空気クツシヨンチヤ
ンバの音響をインピーダンスをパルス燃焼の基本
周波数に影響を与えないくらい充分に大きくし、
マフラを装着しても所定の周波数が維持でき、マ
フラの消音を効果的にしている。ところがパルス
燃焼の場合、燃焼音が非常に大きいので、空気ク
ツシヨンチヤンバの壁面の振動や、壁面からの音
の漏れ特に低周波数域の音の漏れが大きいという
問題点を有していた。このために、マフラを装着
して給、排気口より出る音を減音しても、本体か
らもれる音が大きくなるという問題が生じる場合
もあつた。 However, a problem with the pulse combustor is that it produces a lot of noise during combustion. For this purpose, a muffler is installed, but since the acoustic impedance changes when a muffler is installed, the fundamental frequency of the combustion cycle may change. For this reason, the muffler that you have taken the pains to install is often not as effective as expected. Therefore, the air pulse device is surrounded by an air cushion chamber, and the acoustic impedance of the air cushion chamber is made large enough so as not to affect the fundamental frequency of pulse combustion.
Even when a muffler is attached, a predetermined frequency can be maintained, making the muffler effective at muffling noise. However, in the case of pulse combustion, since the combustion noise is very loud, there are problems such as vibration of the wall surface of the air cushion chamber and leakage of sound from the wall surface, especially sound leakage in the low frequency range. For this reason, even if a muffler is installed to reduce the noise emitted from the supply and exhaust ports, there have been cases in which the noise leaking from the main body becomes louder.
発明の目的
本発明はこれらの問題点に鑑みて行われたもの
で、簡単な構造で低騒音のパルス燃焼器を提供す
るものである。OBJECTS OF THE INVENTION The present invention has been made in view of these problems, and it is an object of the present invention to provide a pulse combustor with a simple structure and low noise.
発明の構成
上記目的を達成するために本発明は空気供給路
内に、その内壁面と空隙を取つて有孔板を設け、
この空隙に吸音材を充填したものである。Structure of the Invention In order to achieve the above object, the present invention provides a perforated plate in the air supply path with a gap between the inner wall surface and the air supply path.
This void is filled with sound absorbing material.
実施例の説明
本発明の一実施例を第1図を用いて説明する。
本実施例のパルス燃焼器は第1図に示すように、
燃焼室1、テイルパイプ2、点火プラグ3、空気
室4、空気供給路5、空気バルブ装置6、有孔板
7、空気クツシヨンチヤンバ8、燃料供給路9、
燃料バルブ装置10、吸音材11から構成され
る。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.
As shown in Fig. 1, the pulse combustor of this embodiment has the following features:
Combustion chamber 1, tail pipe 2, spark plug 3, air chamber 4, air supply path 5, air valve device 6, perforated plate 7, air cushion chamber 8, fuel supply path 9,
It is composed of a fuel valve device 10 and a sound absorbing material 11.
パルス燃焼器の燃焼音は、燃焼室1とテイルパ
イプ2の形状により決定される基本周波数0と基
本周波数の整数倍の音からなる高調波成分をもつ
ている。この基本周波数0は数十ヘルツから数百
ヘルツと低周波の音であるので、この音が空気ク
ツシヨンチヤンバ8の壁面を振動させて、壁面か
らの音の漏れ特に低周波成分の音の漏れを大きく
している。 The combustion sound of the pulse combustor has harmonic components consisting of a fundamental frequency of 0 determined by the shapes of the combustion chamber 1 and the tail pipe 2 and sounds at integral multiples of the fundamental frequency. Since this fundamental frequency 0 is a low frequency sound ranging from tens to hundreds of hertz, this sound vibrates the wall surface of the air cushion chamber 8, causing sound leakage from the wall surface, especially low frequency component sound. It's making the leak bigger.
そこで本実施例では、空気バルブ装置6を通過
し、空気クツシヨンチヤンバ8に入つてくる音を
低減するために、空気供給路5内にこの空気供給
路5の内壁面と空隙を取つて有孔板7を設け、さ
らに空気供給路5と有孔板7の空隙に吸音材11
を充填している。有孔板7には金属板などに小孔
を多数あけたものや、焼結金属や発泡セラミツク
などの多数の小孔を有するものを用いることがで
きる。第2図に示すように、空気室4を通過した
燃焼音12は有孔板7の表面に穿いてある多数の
小孔13より吸音され、空気供給路5と有孔板7
の間の空隙に入る。空隙には吸音材11を充填し
ているために、空隙に入つた音は、空気供給路5
の内壁面と有孔板7の表面の間で、吸音材11に
吸音されながら、衝突や分散を繰り返し、相互干
渉により燃焼音12が消音される。この相互干渉
による消音は、低周波数域から高周波数域に至る
広範囲で効果がある。また吸音材11は、流体を
さえぎり、音圧を通過させる性質を有しているの
で、本発明を実施しても、空気供給路5の流れ状
態は変化せず、燃焼に影響を与えない。さらに本
発明は、燃焼音を低減する方法として、空気供給
系に膨張室等を設けることにより、音圧と流動圧
とを同時に減衰するという方法を用いていないの
で、空気バルブ装置6の空気バルブ14の作動圧
を減衰せずに燃焼音を消音できる。その結果、空
気バルブ14の開閉もスムーズに行われ、燃焼状
態を良好に維持しつつ、燃焼音の低減を行うこと
ができる。 Therefore, in this embodiment, in order to reduce the sound that passes through the air valve device 6 and enters the air cushion chamber 8, a gap is created in the air supply path 5 and the inner wall surface of the air supply path 5. A perforated plate 7 is provided, and a sound absorbing material 11 is provided in the gap between the air supply path 5 and the perforated plate 7.
is filled with. The perforated plate 7 may be a metal plate with many small holes, or a material with many small holes such as sintered metal or foamed ceramic. As shown in FIG. 2, the combustion sound 12 that has passed through the air chamber 4 is absorbed by a large number of small holes 13 formed on the surface of the perforated plate 7, and the sound is absorbed by the air supply path 5 and the perforated plate 7.
Enter the void between. Since the void is filled with sound absorbing material 11, the sound that enters the void is transmitted to the air supply path 5.
While the sound is absorbed by the sound-absorbing material 11, the combustion sound 12 is repeatedly collided and dispersed between the inner wall surface and the surface of the perforated plate 7, and the combustion sound 12 is muffled by mutual interference. Silencing due to this mutual interference is effective over a wide range from low frequency ranges to high frequency ranges. Further, since the sound absorbing material 11 has the property of blocking fluid and allowing sound pressure to pass through, even if the present invention is implemented, the flow state of the air supply path 5 will not change and combustion will not be affected. Furthermore, the present invention does not use a method of simultaneously attenuating sound pressure and flow pressure by providing an expansion chamber or the like in the air supply system as a method for reducing combustion noise. Combustion noise can be muffled without attenuating the operating pressure of 14. As a result, the air valve 14 can be opened and closed smoothly, and combustion noise can be reduced while maintaining a good combustion state.
以上により、燃焼室1で発生した燃焼音は、空
気供給路5と通過する際に消音され、空気クツシ
ヨンチヤンバ8に放射される。それ故に空気クツ
シヨンチヤンバ8の壁面を振動させる原因となる
低周波成分の音が減衰し、空気クツシヨンチヤン
バ8の壁面はほとんど振動せず、壁面からの音の
漏れが著しく減少する。従つて、従来のパルス燃
焼器と比較して低騒音化がはかられる。 As described above, the combustion noise generated in the combustion chamber 1 is muffled when passing through the air supply path 5 and is radiated to the air cushion chamber 8. Therefore, the low-frequency sound component that causes the wall surface of the air cushion chamber 8 to vibrate is attenuated, the wall surface of the air cushion chamber 8 hardly vibrates, and the leakage of sound from the wall surface is significantly reduced. Therefore, noise can be reduced compared to conventional pulse combustors.
発明の効果
本発明によれば、空気クツシヨンチヤンバの壁
面の振動と、壁面からの音の漏れが著しく減少
し、パルス燃焼器の低騒音化に効果がある。Effects of the Invention According to the present invention, the vibration of the wall surface of the air cushion chamber and the leakage of sound from the wall surface are significantly reduced, which is effective in reducing the noise of the pulse combustor.
第1図は本発明の一実施例のパルス燃焼器の断
面図、第2図は同パルス燃焼器の空気供給路の拡
大断面図である。
1……燃焼室、2……テイルパイプ、5……空
気供給路、6……空気バルブ装置、7……有孔
板、8……空気クツシヨンチヤンバ、11……吸
音材。
FIG. 1 is a sectional view of a pulse combustor according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of an air supply path of the pulse combustor. DESCRIPTION OF SYMBOLS 1... Combustion chamber, 2... Tail pipe, 5... Air supply path, 6... Air valve device, 7... Perforated plate, 8... Air cushion chamber, 11... Sound absorbing material.
Claims (1)
記燃焼室の他端に接続した燃料供給路および空気
供給路と、前記燃料供給路に連結した燃料バルブ
装置と、前記空気供給路に連結した空気バルブ装
置と、前記空気バルブ装置をその内部に収納する
とともに、前記空気供給経路に連結した空気クツ
シヨンチヤンバとを備え、前記空気供給路内に、
同空気供給路の内壁面と空隙を取つて有孔板を設
け、前記空隙に吸音材を充填したパルス燃焼器。1. A tail pipe connected to one end of the combustion chamber, a fuel supply passage and an air supply passage connected to the other end of the combustion chamber, a fuel valve device connected to the fuel supply passage, and an air supply passage connected to the air supply passage. a valve device; an air cushion chamber housing the air valve device therein and connected to the air supply path;
A pulse combustor in which a perforated plate is provided with a gap between the inner wall surface of the air supply path and a sound absorbing material is filled in the gap.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7028484A JPS60213706A (en) | 1984-04-09 | 1984-04-09 | Pulse combustion apparatus |
US06/718,452 US4639208A (en) | 1984-04-03 | 1985-04-01 | Pulse combustion apparatus with a plurality of pulse burners |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7028484A JPS60213706A (en) | 1984-04-09 | 1984-04-09 | Pulse combustion apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60213706A JPS60213706A (en) | 1985-10-26 |
JPH0421088B2 true JPH0421088B2 (en) | 1992-04-08 |
Family
ID=13427026
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7028484A Granted JPS60213706A (en) | 1984-04-03 | 1984-04-09 | Pulse combustion apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60213706A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004034138B4 (en) * | 2004-07-15 | 2008-04-03 | Ceramat, S. Coop., Asteasu | Gas-fired heating device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5883609U (en) * | 1981-11-30 | 1983-06-06 | 株式会社東芝 | pulse combustion device |
JPS5897441U (en) * | 1981-12-25 | 1983-07-02 | 株式会社東芝 | pulse burner |
-
1984
- 1984-04-09 JP JP7028484A patent/JPS60213706A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS60213706A (en) | 1985-10-26 |
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