JPS60140007A - Fuel supplying part in pulse combustion apparatus - Google Patents

Abstract

PURPOSE:To keep a combustion in a flame remaining chamber and improve a ratio of turn-down even if a supplying volume of fuel to a combustion chamber is decreased by a structure wherein the flame remaining chamber which is connected to a combustion chamber through a large opening and a small opening, is devided from a main air passage. CONSTITUTION:A flame remaining chamber 6 which is connected to a combustion chamber 1 through a large opening 9 and a small opening 8 at a downstream side air passage of a backflow preventive valve mechanism 4a for the combustion air is defined into a main air passage 5, an injecting port 11a of the fuel supplying passage 11 is made adjacent to the flame remaining chamber 6, thereby a part of the fuel is remained in the flame remaining chamber 6 under a slight lack of air when the fuel is supplied to the combustion chamber 1. As the air fuel ratio in the combustion chamber 1 becomes improper for the stable combustion and even if the amount of supplying fuel is decreased, the flame in the flame remaining chamber 6 may effectively act from the large opening 8 into the combustion chamber 1 as a source of ignition, resulting in carrying out the stable combustion.

Description

【発明の詳細な説明】 本発明は、燃焼室の一端側に、逆流防止用弁機構を介し
て、燃料供給路及び燃焼用空気供給路を、かつ、他端側
に、燃焼排ガスの排出路を形成するテイルパイプを接続
して、爆発に伴う燃焼排ガスの動慣性によ多流体燃料及
び燃焼用空気を前記燃焼室に流入させ、爆発燃焼させる
べく構成したパルス燃焼装置の燃料供給部の改良に関す
る。Detailed Description of the Invention The present invention provides a fuel supply passage and a combustion air supply passage at one end of the combustion chamber via a backflow prevention valve mechanism, and a combustion exhaust gas exhaust passage at the other end. Improvement of a fuel supply unit of a pulse combustion device configured to connect a tail pipe forming a combustion chamber to cause multi-fluid fuel and combustion air to flow into the combustion chamber due to the dynamic inertia of combustion exhaust gas accompanying an explosion to cause explosive combustion. Regarding.

従来、第３図に示すように、混合ヘッド（ＩＩＯにより
区画形成された複数の空気路（５）全てに、供給路０υ
からの燃料を吐出口（ｌｌａ）により分配供給していた
。Conventionally, as shown in FIG.
The fuel from the engine was distributed and supplied through the discharge port (lla).

しかし、パルス燃焼においては燃焼室（１）内圧力変動
により燃焼用空気を燃焼室（１）に吸入しており、かつ
、燃料供給量が減少しても燃焼室（１）内圧力の変動中
は余り小さくならず、したがって、燃料供給量が減少す
ると、燃焼室（１）内で空気過剰になって、不完全燃焼
や不安定燃焼を生じ、そのために、ターンダウン比が、
例えば１７１．５〜１／８程度というように小さくなる
欠点があった。However, in pulse combustion, combustion air is drawn into the combustion chamber (1) due to pressure fluctuations within the combustion chamber (1), and even if the amount of fuel supplied decreases, the pressure within the combustion chamber (1) continues to fluctuate. is not very small, and therefore, when the amount of fuel supplied decreases, there will be excess air in the combustion chamber (1), causing incomplete combustion or unstable combustion, and for this reason, the turndown ratio will become
For example, there was a drawback that the size was reduced to about 171.5 to 1/8.

本発明の目的は、燃料供給構成の改良によって、燃料供
給量が減少しても確実に安定燃焼が維持されて、ターン
ダウン比を大きくできるようにする点にある。An object of the present invention is to improve the fuel supply configuration so that stable combustion can be reliably maintained even when the amount of fuel supplied is reduced, and the turndown ratio can be increased.

本発明による燃料供給部の特徴構成は、パルス燃焼装置
において、燃焼室に大きな開口により、かつ、燃焼用空
気に対する逆流防止用弁機構の下流側空気路に小さな開
口により夫々接続された掛留り室を、主空気路と区画形
成し、燃料供給路の吐出口を掛留り室に臨設したことに
あり、その作用効果は次の通りである。A characteristic configuration of the fuel supply section according to the present invention is that, in a pulse combustion device, a hanging portion is connected to the combustion chamber through a large opening and to the downstream air passage of a valve mechanism for preventing backflow of combustion air through a small opening. The chamber is separated from the main air passage, and the discharge port of the fuel supply passage is provided adjacent to the hanging chamber, and its effects are as follows.

つまり、燃焼室への燃料供給に際して、燃料の一部が掛
留り室にやや空気不足の状態で残るように、掛留シ室に
空気を供ｉする小さな開口の面積を設定すると、燃焼室
内での爆発に際しても掛留り室内では残存する燃料と空
気による燃焼が徐々に行われ、燃焼室からの排気に際し
ても残存する燃料と空気によって掛留シ室での燃焼が継
続され、さらには、燃焼室への吸気に際しては、掛留り
室に供給される空気と燃料によって掛留り室での燃焼が
継続されるようにできるのである。In other words, when supplying fuel to the combustion chamber, if the area of the small opening that supplies air to the hanging chamber is set so that some of the fuel remains in the hanging chamber in a slightly air-deficient state, then Even in the event of an explosion, the remaining fuel and air will gradually burn in the hanging chamber, and even when the combustion chamber is exhausted, the remaining fuel and air will continue combustion in the hanging chamber. When air is taken into the combustion chamber, combustion in the hanging chamber can be continued by the air and fuel supplied to the hanging chamber.

そして、上述のような掛留り室における燃焼継続は、燃
焼室への燃料供給量がかなシ減少しても、掛留り室への
空気流入量がほぼ一定であり、掛留り室の容積に比して
燃料供給量が極めて多いから、変りなく行われるのであ
る。As for the continuation of combustion in the hanging chamber as described above, even if the amount of fuel supplied to the combustion chamber decreases momentarily, the amount of air flowing into the hanging chamber remains almost constant, and the hanging chamber remains constant. Because the amount of fuel supplied is extremely large compared to the volume, it is carried out without change.

したがって、燃焼室内での空燃比が安定燃焼に不適なも
のになるほど燃料供給量が減少したとしても、掛留り室
内の炎が着火源として大きな開口から燃焼室内に有効作
用し、安定した燃焼が燃焼室において行われる。Therefore, even if the amount of fuel supplied decreases to such an extent that the air-fuel ratio in the combustion chamber becomes unsuitable for stable combustion, the flame in the hanging chamber will effectively act as an ignition source into the combustion chamber through the large opening, resulting in stable combustion. takes place in the combustion chamber.

その結果、燃料供給量の減少中を大きくしても、良好な
パルス燃焼を確実に維持できるようになυ、ターンダウ
ン比を、例えば１１５程度というように、従来に比して
大巾に増大でき、負荷変動の大きい加熱等に便利かパル
ス燃焼装部を提供できるようになった。As a result, it is now possible to reliably maintain good pulse combustion even when the fuel supply amount is reduced, and the turndown ratio has been significantly increased compared to the conventional method, for example to about 115. This makes it possible to provide a pulse combustion system, which is convenient for heating applications with large load fluctuations.

次に実施例を示す。Next, examples will be shown.

第１図に示すように、燃焼室（１）の一端側に、電動フ
ァン（２）を備えた燃焼用空気供給路（３）を、逆流防
止用弁機構（４ａ）を介して接続し、その弁機構（４ａ
）の下流側に、主空気路（５）及びその全周にわたる掛
留り室（６）を区画形成する隔壁（７）を設け、弁機構
（４ａ）の下流側空気路（３ａ）と掛留り室（６）を接
続する小さな開口（８）、及び、掛留り室（６）と燃焼
室（１）を接続する大きな開口（９）を形成し、逆流防
止用弁機構（４ｂ）及び流量調節弁Ｏｑを有する燃料ガ
ス供給路θυの吐出口（ｌｌａ）を掛留り室（６）に臨
設し、燃焼室（１）の他端側に、燃焼排ガスの排出路を
形成する直管状テイルパイプ（６）を接続し、燃焼室（
１）に始動用点火プラグＩ）４を付設し、もって、パル
ス燃焼装置を構成しである。As shown in FIG. 1, a combustion air supply path (3) equipped with an electric fan (2) is connected to one end of the combustion chamber (1) via a backflow prevention valve mechanism (4a), Its valve mechanism (4a
) is provided on the downstream side of the main air passage (5) and a partition wall (7) that partitions the hanging chamber (6) over its entire circumference, and connects the downstream air passage (3a) of the valve mechanism (4a) and the hanging chamber (6). A small opening (8) connecting the retaining chamber (6) and a large opening (9) connecting the retaining chamber (6) and the combustion chamber (1) are formed, and a backflow prevention valve mechanism (4b) is formed. A discharge port (lla) of a fuel gas supply path θυ having a flow control valve Oq and a flow rate control valve Oq is provided adjacently in the hanging chamber (6), and a direct hole forming a combustion exhaust gas discharge path is provided at the other end of the combustion chamber (1). Connect the tubular tail pipe (6) and complete the combustion chamber (
A starting spark plug I) 4 is attached to 1) to constitute a pulse combustion device.

上記パルス燃焼装置の動作について説明する。The operation of the above pulse combustion device will be explained.

始動時に、電動ファン（２）を作動させて、燃料ガスと
燃焼用空気を適当混合比で燃焼室（１）に供給し、かつ
、点火プラグＱニヤにより燃焼室（１）内で爆発を生じ
させる。その結果、爆発に伴う燃焼排ガスの動慣性によ
って、前記両供給路（３）、αυから適当量づつ燃焼用
空気が燃焼室（１）に送り込まれ、燃焼室（１）に残存
する炎により再着火し、再び爆発が生じ、そして、その
ような動作が繰返されるのである。尚、電動ファン（２
）及び点火プラグ□□□の作動は、パルス燃焼が安定す
れば停止させる。At the time of startup, the electric fan (2) is operated to supply fuel gas and combustion air at an appropriate mixing ratio to the combustion chamber (1), and an explosion is caused in the combustion chamber (1) by the spark plug Q. let As a result, due to the dynamic inertia of the combustion exhaust gas accompanying the explosion, an appropriate amount of combustion air is sent into the combustion chamber (1) from both the supply paths (3) and αυ, and is regenerated by the flame remaining in the combustion chamber (1). It ignites, another explosion occurs, and the process repeats. In addition, electric fans (2
) and spark plug □□□ will be stopped when pulse combustion becomes stable.

さらに、掛留り室（６）内に、そこでやや空気不足に寿
って燃焼が常に継続されるように、適当量の空気が小さ
な開口（８）から供給され、燃焼室（１）内での爆発が
掛留シ室（６）内の炎を着火源として安定的に繰返され
るのである。Furthermore, an appropriate amount of air is supplied through a small opening (8) into the hanging chamber (6) so that combustion can continue at all times even if there is a slight lack of air there. These explosions are stably repeated using the flame in the hanger chamber (6) as the ignition source.

尚、小さな開口（８）及び大きな開口（９）の面積はパ
ルス燃焼装置の特性に見合って、適当に設定される。Incidentally, the areas of the small opening (8) and the large opening (9) are appropriately set in accordance with the characteristics of the pulse combustion device.

次に別の実施例を説明する。Next, another embodiment will be described.

掛留り室（６）を形成するに、第２図に示すように、環
状に配置した適当数の主空気路（５）群の中央に掛留り
室（６）を配置する等、その他具体的構成において適宜
変更が可能である。To form the hanging chamber (6), as shown in FIG. Changes can be made as appropriate in the specific configuration.

燃料としては、都市ガス、天然ガス、プロパンガス等の
ガス燃料を主として利用するが、油等の液体燃料も利用
でき、要するに流体燃料であればよい。As the fuel, gas fuels such as city gas, natural gas, propane gas, etc. are mainly used, but liquid fuels such as oil can also be used, and in short, any fluid fuel may be used.

パルス燃焼装置は、例えば流体中にテイルバイプ０鰻等
を位置させて流体を加熱する等の各種加熱目的、あるい
は、排気エネルギーを利用する目的等に利用でき、また
、具体的構成において適宜変更自在である。The pulse combustion device can be used for various heating purposes, such as heating a fluid by placing a tail-vip 0 eel or the like in the fluid, or for the purpose of utilizing exhaust energy, and the specific configuration can be changed as appropriate. be.

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

第１図は、本発明の実施例を示す概略断面図、第２図は
、本発明の別実施例を示す概略断面図である。第３図は
、従来例の概略断面図である。 （１）・・・・・燃焼室、（３）・・・・・燃焼用空気
供給路、（８ａ）・・・・・空気路、（４ａ）、（４ｂ
）・・・・・逆流防止用弁機構、（５）・・・・・・主
空気路、（６）・・・・掛留り室、（８）。 （９）・・・・・開口、０υ・・・・・・燃料供給路、
（ｌｌ＆）・・・・・・吐出口、＠・・・・・・テイル
パイプ。 代理人　弁理士　北　村　修FIG. 1 is a schematic sectional view showing an embodiment of the present invention, and FIG. 2 is a schematic sectional view showing another embodiment of the invention. FIG. 3 is a schematic sectional view of a conventional example. (1)... Combustion chamber, (3)... Combustion air supply path, (8a)... Air path, (4a), (4b
)... Valve mechanism for backflow prevention, (5)... Main air path, (6)... Holding chamber, (8). (9)...Opening, 0υ...Fuel supply path,
(ll&)・・・Discharge port, @・・・Tail pipe. Agent Patent Attorney Osamu Kitamura

Claims (1)

【特許請求の範囲】 燃焼室（１）の一端側に、逆流防止用弁機構（４ａ）。 （４ｂ）を介して、燃料供給路０υ及び燃焼用空気供給
路（３）を、かつ、他端側に、燃焼排ガスの排出路を形
成するテイルバイプ（６）を接続して、爆発に伴う燃焼
排ガスの動慣性により流体燃料及び燃焼用空気を前記燃
焼室（１）に流入させ、爆発燃焼させるべく構成したパ
ルス燃焼装置において、前記燃焼室（１）に大きな開口
（９）により、かつ、前記燃焼用空気に対する逆流防止
用弁機構（４１）の下流側空気路（８ａ）に小さな開口
（８）によシ夫々接続された炎留り室（６）を、主空気
路（５）と区画形成し、前記燃料供給路０ηの吐出口（
ｌｌａ）を前記炎留り室（６）に臨設しであるパルス燃
焼装置の燃料供給部。[Claims] A backflow prevention valve mechanism (4a) is provided at one end of the combustion chamber (1). (4b), the fuel supply path 0υ and the combustion air supply path (3) are connected to the other end, and a tail pipe (6) forming a combustion exhaust gas exhaust path is connected to In a pulse combustion apparatus configured to cause fluid fuel and combustion air to flow into the combustion chamber (1) by the dynamic inertia of exhaust gas and cause explosive combustion, the combustion chamber (1) is provided with a large opening (9) and the The flame arresting chambers (6) each connected to the downstream air passage (8a) of the backflow prevention valve mechanism (41) for combustion air through small openings (8) are separated from the main air passage (5). and the discharge port of the fuel supply path 0η (
lla) is installed in the flame holder (6), and is a fuel supply section of a pulse combustion device.