JP3087200B2 - Combustion safety device - Google Patents
Combustion safety deviceInfo
- Publication number
- JP3087200B2 JP3087200B2 JP04358213A JP35821392A JP3087200B2 JP 3087200 B2 JP3087200 B2 JP 3087200B2 JP 04358213 A JP04358213 A JP 04358213A JP 35821392 A JP35821392 A JP 35821392A JP 3087200 B2 JP3087200 B2 JP 3087200B2
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- Japan
- Prior art keywords
- combustion
- flame
- air
- burner
- safety device
- 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
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- Regulation And Control Of Combustion (AREA)
- Control Of Combustion (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、燃焼用空気を強制的に
取り込んで燃焼する燃焼器（例えば、強制排気式燃焼
器）の不完全燃焼を防止するための安全装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for preventing incomplete combustion of a combustor (for example, a forced exhaust combustor) forcibly taking in combustion air and burning.
【０００２】[0002]
【従来の技術】一酸化炭素中毒の原因である不完全燃焼
は、主に燃焼器の給排気系不良や、排気の漏洩による室
内酸欠状態という２つの要因により生じる。そこで、従
来から燃焼器には不完全燃焼を検知して燃焼を停止させ
る安全装置が設けられている。こうした安全装置の技術
は、例えば特公昭５９−３９６４７号、特公昭６１−３
１７６８号などに示されている。2. Description of the Related Art Incomplete combustion, which is a cause of carbon monoxide poisoning, is mainly caused by two factors: a defective supply / exhaust system of a combustor and a state of lack of oxygen in a room due to leakage of exhaust gas. Therefore, a safety device is conventionally provided in the combustor to detect incomplete combustion and stop the combustion. The technology of such a safety device is disclosed in, for example, Japanese Patent Publication No. 59-39647 and Japanese Patent Publication No. Sho 61-3.
No. 1768.
【０００３】前者は、図１０に示すように、外筒５０内
に混合ガスが供給される内筒５１を設けて、各々の開口
部でブンゼン燃焼させ、一次空気口５２および補助空気
口５３から流入する空気の酸素濃度が低下したときに、
内筒５１側のブンゼン火炎がリフトすることから、この
リフト現象による熱電対５４の起電力低下でガス流路を
閉じるものである。また、後者は、フィン閉塞等の排気
系不良により排出しきれない燃焼排気を、上記の空気口
に導入するようにして燃焼用空気の酸素濃度を低下さ
せ、ブンゼン火炎をリフトさせて異常を検出している。In the former, as shown in FIG. 10, an inner cylinder 51 to which a mixed gas is supplied is provided in an outer cylinder 50, and Bunsen combustion is performed in each opening, and a primary air port 52 and an auxiliary air port 53 are provided. When the oxygen concentration of the incoming air drops,
Since the Bunsen flame on the side of the inner cylinder 51 is lifted, the gas flow path is closed by a decrease in the electromotive force of the thermocouple 54 due to the lift phenomenon. In the latter case, abnormalities are detected by introducing the combustion exhaust that cannot be exhausted due to exhaust system failure such as fin blockage into the above air port to lower the oxygen concentration of the combustion air and lift the Bunsen flame. doing.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、ファン
により強制的に燃焼用空気を取り込む燃焼機器にこれら
の安全装置を組み込んでも、室内の酸欠による不完全燃
焼は検出できるものの、給排気経路の閉塞やファンの能
力低下による風量低下に伴う不完全燃焼は検出できない
という問題が生じていた。その理由について説明する。
火炎の形成位置は、燃焼速度とガス噴出速度とのバラン
スで決まる。一方、燃焼速度は空気比（理論空気量に対
する実際の空気量の比）によって決まる。そこで、ファ
ンから供給される風量低下が生じると安全装置に供給さ
れる混合気の空気比も低下することとなり、燃焼速度が
低下する。従って、火炎はリフトするはずであるが、ブ
ンゼン燃焼の場合には、拡散燃焼であることから縦方向
だけでなく横方向、斜め方向にも広がるため、空気比の
低下に対して敏感にリフトしない。しかも、二次空気の
流速が低下することも手伝って、かえってリフトを抑え
る側に働いてしまう。この結果、熱電対で火炎の状態を
検出していても、風量低下による不完全燃焼は防止でき
ないのである。本発明の燃焼安全装置は上記課題を解決
し、室内の酸欠であっても給排気不良による風量低下で
あっても確実に不完全燃焼を検知することを目的とす
る。However, even if these safety devices are incorporated in a combustion device that forcibly takes in combustion air by a fan, incomplete combustion due to lack of oxygen in the room can be detected, but the supply / exhaust passage is blocked. And incomplete combustion due to a decrease in air flow due to a decrease in fan capacity cannot be detected. The reason will be described.
The position where the flame is formed is determined by the balance between the burning speed and the gas ejection speed. On the other hand, the combustion speed is determined by the air ratio (the ratio of the actual air amount to the theoretical air amount). Therefore, when the amount of air supplied from the fan decreases, the air ratio of the air-fuel mixture supplied to the safety device also decreases, and the combustion speed decreases. Therefore, the flame should lift, but in the case of Bunsen combustion, since it is diffusion combustion, it spreads not only vertically but also horizontally and diagonally, so it does not lift sensitively to a decrease in the air ratio. . In addition, the flow rate of the secondary air is reduced, and thus the lift is suppressed. As a result, even if the state of the flame is detected by the thermocouple, incomplete combustion due to a decrease in the air volume cannot be prevented. An object of the present invention is to solve the above-mentioned problems and to surely detect incomplete combustion even when there is a lack of oxygen in a room or a decrease in air volume due to defective air supply / exhaust.
【０００５】[0005]
【課題を解決するための手段】本発明の燃焼安全装置
は、燃焼用空気を強制的に取り込んで燃焼するメインバ
ーナに隣接して、該メインバーナの空気供給路中に配設
される安全装置であって、複数の炎孔を形成したプレー
トを炎口形成面とした予混合バーナと、上記炎孔形成面
を囲んで、上記炎孔形成面に形成される火炎と上記予混
合バーナの周囲の燃焼用空気との接触を妨げるととも
に、燃焼用空気の供給量不足により上記炎孔形成面に形
成される火炎がリフトしたとき先端開口部にて保炎する
筒状ガードと、上記火炎の形成位置に応じた検知信号を
出力する炎検知素子とを備えたことを要旨とする。SUMMARY OF THE INVENTION A combustion safety device according to the present invention comprises a main bar for forcibly taking in combustion air and burning.
In the main burner's air supply passage adjacent to the burner
A safety device that is, a premixed burner and the flame opening forming surface play <br/> bets forming a plurality of flame holes, surrounding the burner ports formed surface is formed in the flame hole forming surface Flame and the above premix
And prevents contact with the combustion air around the burner.
In addition, due to insufficient supply of combustion air,
The gist comprises a tubular guard that holds the flame at the tip opening when the formed flame is lifted, and a flame detection element that outputs a detection signal according to the flame formation position. .
【０００６】[0006]
【作用】上記構成を有する本発明の燃焼安全装置は、メ
インバーナに隣接してその空気供給路中に設けられ、炎
孔形成面に形成される火炎が筒状ガードにより周囲の燃
焼用空気との接触を妨げられて全一次燃焼が行われ、こ
の火炎の形成位置に応じた検知信号を炎検知素子が出力
する。給排気系の不良によりメインバーナへの燃焼用空
気量が減少したときには、それに伴って予混合バーナの
空気比が低下し燃焼速度が変化する。この場合、全一次
燃焼であることから、火炎の状態は燃料噴出方向にのみ
変化、つまりリフトすることとなり火炎形成位置が大き
く変化する。また、二次空気の流速にも影響されない。
この結果、燃焼用空気量の変動に対して火炎形成位置が
敏感に変化し、これにより炎検知素子の出力が変化して
異常が検出される。しかも、リフトした火炎は、筒状ガ
ードの先端開口部に達すると燃焼用空気と接触して保炎
されるため、筒状ガード内で火炎が不安定にリフトする
といった異常燃焼までの過渡状態の期間を短くすること
ができ、火炎位置の変化を大きくとることができる。こ
の結果、給気不足か否かを明確に区別できるものとな
り、センシングが容易になる。また、室内が酸欠状態で
ある場合には、予混合バーナの空気比は一定であっても
燃焼に寄与する酸素量が実質的に低下していることか
ら、燃焼速度が低下して火炎形成位置が変化する。これ
らの結果、炎検知素子の出力に基づくことにより、メイ
ンバーナの不完全燃焼を確実に防止することができる。[Action] Combustion safety device of the present invention having the above structure, main
It is provided in the air supply passage adjacent to the
The flame formed on the hole-forming surface prevents the surrounding
All primary combustion is performed by preventing contact with the burning air, and the flame detection element outputs a detection signal corresponding to the flame formation position. When combustion air amount to the main burner is reduced by failure of the supply and exhaust system, the air ratio of the premixed burner is changed is reduced burning rate accordingly. In this case, since all the primary combustions are performed, the state of the flame changes only in the fuel ejection direction , that is, lifts up , and the flame formation position changes greatly. It is not affected by the flow rate of the secondary air.
As a result, the flame formation position changes sensitively to the fluctuation of the combustion air amount, whereby the output of the flame detection element changes and abnormality is detected. Moreover, the lifted flame is a cylindrical gas.
When it reaches the tip opening of the card, it comes into contact with combustion air and holds flame
The flame rises in the tubular guard
To shorten the period of the transient state until abnormal combustion
And the change of the flame position can be made large. This
As a result, it is possible to clearly distinguish whether or not there is insufficient air supply.
Sensing becomes easier. Further, when the room is in an oxygen-deficient state, the combustion rate decreases and the flame formation occurs because the amount of oxygen contributing to combustion is substantially reduced even if the air ratio of the premix burner is constant. The position changes. As a result, based on the output of the flame detection element ,
The incomplete combustion of Nbana can be reliably prevented.
【０００７】[0007]
【実施例】以上説明した本発明の構成・作用を一層明ら
かにするために、以下本発明の燃焼安全装置の好適な実
施例について説明する。図１は、一実施例としての燃焼
安全装置の概略構成を表す。燃焼安全装置１は、後述す
る強制排気式（ＦＥ式）ガス給湯器の燃焼室内でメイン
バーナに隣合って設けられるもので、縦方向に配置され
て両端を開口した筒体２と、この筒体２の途中に装着さ
れ複数の炎口３を形成する多孔質プレート４（本実施例
ではセラミックプレートを用いる）とで予混合バーナ５
を構成すると共に、筒体２の上部（セラミックプレート
より上部）が二次空気の接触を妨げる筒状ガード６とな
っている。詳しくは、筒体２の下開口部７にガスノズル
２０を臨ませて多孔質プレート４までの間を混合室８と
し、混合室８での空気比を正常時には０．９となるよう
に下開口部７の開度が設定されている。この混合比
（０．９）は燃焼速度が最大となる設定である。つま
り、混合比がこの値から外れてくると燃焼速度が遅くな
るようになっている。DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the combustion safety device of the present invention will be described below. FIG. 1 shows a schematic configuration of a combustion safety device as one embodiment. A combustion safety device 1 is provided adjacent to a main burner in a combustion chamber of a forced exhaust gas (FE type) gas water heater described later. A premix burner 5 with a porous plate 4 (in this embodiment, a ceramic plate is used) mounted in the middle of the body 2 and forming a plurality of flame ports 3
And the upper part of the cylindrical body 2 (above the ceramic plate) is a cylindrical guard 6 for preventing contact with secondary air. Specifically, the gas nozzle 20 faces the lower opening 7 of the cylindrical body 2 and the space between the porous plate 4 and the gas nozzle 20 is defined as a mixing chamber 8, and the lower opening is set so that the air ratio in the mixing chamber 8 is 0.9 in normal operation. The opening of the section 7 is set. This mixture ratio (0.9) is a setting at which the combustion speed is maximized. That is, when the mixture ratio deviates from this value, the combustion speed is reduced.
【０００８】混合室８で混合された混合気は、多孔質プ
レート４の各炎口３から噴出し、給湯器のメインバーナ
（図９に示す）から火移りしてプレート表面上で火炎を
形成する。この場合、火炎の回りを囲む筒状ガード６に
よって二次空気の供給が遮られ、全一次燃焼が行われ
る。筒状ガード６には、横方向から熱電対９が装着され
その受熱部９ａが火炎内に位置付けられている。この熱
電対９は、給湯器の燃焼コントローラ（図示略）に接続
され、熱電対９の起電力に応じてメインバーナのガス流
路に設けた電磁弁を開閉制御するように構成されてい
る。つまり、熱電対９の起電力が所定レベル以下になっ
たときにガス流路を閉じるように動作する。尚、熱電対
９の起電力でマグネット安全弁を吸着保持してガス流路
を開状態に維持する構成であってもよい。The air-fuel mixture mixed in the mixing chamber 8 is blown out from each flame port 3 of the porous plate 4 and transferred from a main burner (shown in FIG. 9) of the water heater to form a flame on the plate surface. I do. In this case, the supply of the secondary air is interrupted by the cylindrical guard 6 surrounding the flame, and all the primary combustion is performed. A thermocouple 9 is attached to the tubular guard 6 from the lateral direction, and a heat receiving portion 9a thereof is positioned in the flame. The thermocouple 9 is connected to a combustion controller (not shown) of the water heater, and is configured to control opening and closing of an electromagnetic valve provided in a gas passage of the main burner according to an electromotive force of the thermocouple 9. That is, it operates so as to close the gas flow path when the electromotive force of the thermocouple 9 becomes lower than the predetermined level. Note that a configuration may be employed in which the magnet safety valve is attracted and held by the electromotive force of the thermocouple 9 to maintain the gas flow path open.
【０００９】さて、図示しない熱交換器のフィン閉塞
や、燃焼室に燃焼用空気を送り込むファン能力低下によ
り燃焼用空気の風量が減少すると、混合室８内の空気比
が減少し燃焼速度が低下する。このため、多孔質プレー
ト４上に形成されていた火炎はリフトしていき、図２に
示すようについには筒状ガード６先端開口部に火炎を形
成する。つまり、全一次燃焼中においては風量の低下
（空気比の低下）に対して火炎が敏感にリフトし、筒状
ガード６先端開口部に達すると、その周りから二次空気
が供給されてブンゼン燃焼が行われる。また、ブンゼン
燃焼時には、拡散燃焼であることや、風量の低下により
火炎を上方に持ち上げる力が減ることから、風量の変化
に対してほとんどリフトしなくなる。When the air volume of the combustion air is reduced due to blockage of a fin of a heat exchanger (not shown) or a reduction in a fan capacity for feeding the combustion air into the combustion chamber, the air ratio in the mixing chamber 8 is reduced and the combustion speed is reduced. I do. For this reason, the flame formed on the porous plate 4 is lifted, and finally, the flame is formed at the opening of the tip of the cylindrical guard 6 as shown in FIG. That is, during the entire primary combustion, the flame lifts sensitively to a decrease in the air volume (a decrease in the air ratio). When the flame reaches the opening of the tip end of the cylindrical guard 6, the secondary air is supplied from therearound, and the Bunsen combustion is performed. Is performed. Further, during Bunsen combustion, since the combustion is diffusion combustion and the force for lifting the flame upward due to a decrease in the airflow decreases, the lift hardly occurs in response to a change in the airflow.
【００１０】このように風量が減少すると、熱電対９の
起電力は図３に示すように、急激に減少する。この特性
図は実験により得られたもので、横軸は給湯器のメイン
バーナの空気比λを、実線は熱電対の起電力（mV）を、
破線は器具排気中の一酸化炭素濃度（ppm ）を表す。特
性図から分かるように、熱電対９の起電力は空気比の低
下に対して急激に減少する。従って、一酸化炭素濃度が
高くなる前に熱電対９の起電力が設定値以下になりガス
流路を閉じることができる。When the air volume decreases in this manner, the electromotive force of the thermocouple 9 rapidly decreases as shown in FIG. This characteristic diagram was obtained by experiments. The horizontal axis represents the air ratio λ of the main burner of the water heater, the solid line represents the electromotive force (mV) of the thermocouple,
The dashed line indicates the concentration of carbon monoxide (ppm) in the exhaust gas of the device. As can be seen from the characteristic diagram, the electromotive force of the thermocouple 9 sharply decreases as the air ratio decreases. Therefore, before the carbon monoxide concentration becomes high, the electromotive force of the thermocouple 9 becomes equal to or less than the set value, and the gas passage can be closed.
【００１１】次に、室内の酸素濃度の低下による不完全
燃焼を防止する作動について説明する。室内の酸素濃度
が低下すると、風量（空気比）が同じであっても燃焼に
寄与する酸素量が減少するために、燃焼速度が遅くな
る。この結果、図４に示すように全一次燃焼中の火炎が
リフトし始め、筒状ガード６先端開口部に達したのちは
失火してしまう。この場合の熱電対９の起電力および器
具排気中の一酸化炭素濃度の特性を図５に示す。この特
性図は実験により得られたもので、横軸を酸素濃度
（％）としている。特性図から分かるように、一酸化炭
素濃度は室内酸素濃度が１８．５％以下にまで低下して
急激に上昇するのに対し、熱電対９の起電力は酸素濃度
低下に対してリニアに減少する。従って、一酸化炭素濃
度が上昇するまでに熱電対９の起電力は十分低下してい
るため、安全レベルで確実にガス流路を閉じることがで
きる。Next, an operation for preventing incomplete combustion due to a decrease in the oxygen concentration in the room will be described. When the oxygen concentration in the room decreases, the combustion speed decreases because the amount of oxygen contributing to combustion decreases even if the air volume (air ratio) is the same. As a result, as shown in FIG. 4, the flame during the all primary combustion starts to lift, and after reaching the opening at the tip end of the cylindrical guard 6, the flame goes out. FIG. 5 shows the characteristics of the electromotive force of the thermocouple 9 and the concentration of carbon monoxide in the exhaust gas of the appliance in this case. This characteristic diagram is obtained by an experiment, and the horizontal axis represents the oxygen concentration (%). As can be seen from the characteristic diagram, the concentration of carbon monoxide sharply rises while the oxygen concentration in the room drops to 18.5% or less, whereas the electromotive force of the thermocouple 9 decreases linearly with the decrease in oxygen concentration. I do. Therefore, the electromotive force of the thermocouple 9 is sufficiently reduced before the concentration of carbon monoxide increases, so that the gas passage can be reliably closed at a safe level.
【００１２】次に、熱電対９の装着位置の変形例につい
て説明する。先の実施例では、熱電対９を筒状ガード６
に横方向から装着したが、図６（Ａ）に示すように多孔
質プレート４に貫通させて受熱部９ａを火炎内に位置さ
せた構成や、同図（Ｂ）に示すように受熱部９ａを多孔
質プレート４に埋設させて、赤熱するプレート温度を検
出する構成であってもよい。更に、同図（Ｃ）に示すよ
うに筒状ガード６先端開口部の上に設けて、リフト時に
起電力を発生させる構成であってもよい。Next, a modification of the mounting position of the thermocouple 9 will be described. In the above embodiment, the thermocouple 9 is connected to the cylindrical guard 6.
6A, the heat receiving portion 9a is penetrated through the porous plate 4 to position the heat receiving portion 9a in the flame, as shown in FIG. 6A, or the heat receiving portion 9a as shown in FIG. May be embedded in the porous plate 4 to detect the temperature of the plate that glows red. Further, as shown in FIG. 7C, a configuration may be provided in which the electromotive force is generated at the time of lifting by being provided above the opening of the end of the cylindrical guard 6.
【００１３】また、予混合バーナ５の形状も様々なもの
が考えられる。例えば、図７に示すように、Ｕ字状に形
成されたスロート１１を中継して横向きに配置すること
で、熱交換器からのドレン等による落下物詰まりを防止
するようにしてもよい。更に、図８に示すように、Ｖ字
状に形成されたスロート１２を中継して傾斜させて配置
すると共に、筒状ガード６先端に落下物防止板１３を設
けるようにしてもよい。また、この落下物防止板１３は
メインバーナからの火移りを補助する火移り板としても
作用する。Various shapes of the premix burner 5 can be considered. For example, as shown in FIG. 7, the throat 11 formed in a U-shape may be relayed and arranged sideways to prevent clogging of falling objects due to drainage from the heat exchanger. Further, as shown in FIG. 8, the throat 12 formed in a V-shape may be relayed and arranged to be inclined, and a falling object prevention plate 13 may be provided at the tip of the cylindrical guard 6. The fallen object prevention plate 13 also functions as a fire transfer plate for assisting the transfer of fire from the main burner.
【００１４】次に、燃焼安全装置１をガス給湯器内に組
み込んだ構成の一例を示す。図９は、ＦＥ式ガス給湯器
の燃焼室３０内を上方から視た概略構成図である。燃焼
室３０内には、偏平な複数のメインバーナ３１が並設さ
れ、それらのスロート３２先端に一次空気量調整用のダ
ンパ３３が設けられ、ノズル台３４に設けられた各ガス
ノズル３５から燃料ガスが供給される。このノズル台３
４へのガス流路には能力（燃焼量）を調整するための比
例制御弁やガス流路を開閉する電磁弁（以上図示略）が
設けられる。また、燃焼室３０の下部にはシロッコファ
ン（図示略）が設けられ、燃焼用空気を燃焼室３０に供
給しメインバーナ３１でブンゼン燃焼を行い、この燃焼
熱で熱交換器（図示略）を加熱して出湯するよう構成さ
れている。Next, an example of a configuration in which the combustion safety device 1 is incorporated in a gas water heater will be described. FIG. 9 is a schematic configuration diagram of the inside of the combustion chamber 30 of the FE gas water heater as viewed from above. In the combustion chamber 30, a plurality of flat main burners 31 are arranged side by side, a damper 33 for adjusting a primary air amount is provided at the tip of the throat 32, and fuel gas is supplied from each gas nozzle 35 provided on a nozzle base 34. Is supplied. This nozzle base 3
The gas flow path to 4 is provided with a proportional control valve for adjusting the capacity (amount of combustion) and an electromagnetic valve (not shown) for opening and closing the gas flow path. Further, a sirocco fan (not shown) is provided below the combustion chamber 30 to supply combustion air to the combustion chamber 30 to perform Bunsen combustion with the main burner 31, and a heat exchanger (not shown) is generated by the combustion heat. It is configured to heat and tap.
【００１５】燃焼安全装置１は、このメインバーナ３１
に並設され、共通のノズル台３４に設けたガスノズル３
６から燃料ガスが供給される。従って、別個にガス流路
を設けることなく簡易な構造となっている。また、能力
が大の場合と小の場合とでは、メインバーナ３１の空気
比の設定が異なるが、燃焼安全装置１においてもそれに
応じて空気比が変更され、実際のメインバーナ３１の燃
焼状態にそくした不完全燃焼検出を実施することができ
る。The combustion safety device 1 includes a main burner 31
And the gas nozzles 3 provided on the common nozzle base 34
Fuel gas is supplied from 6. Therefore, the structure is simple without providing a separate gas flow path. In addition, although the setting of the air ratio of the main burner 31 is different between the case where the capacity is large and the case where the capacity is small, the air ratio is also changed in the combustion safety device 1 accordingly, and the actual combustion state of the main burner 31 is changed. Incomplete combustion detection can be performed.
【００１６】以上説明した実施例においては、熱電対９
の起電力が所定値以下に減少したときにガス流路を閉じ
るものであったが、さらに、ガス流路を閉じる前にファ
ンの回転数を調整するようにしてもよい。つまり、排気
ダクト（図示略）からの逆風やフィン閉塞等により空気
比が低下したときには、ファンの回転数を増大させれば
燃焼器を停止させることなく使用できるケースがある。
そこで、熱電対９の起電力が予め設定したレベルにまで
低下したときに、ファンの回転数を増大すると共に所定
の回転数に達しても起電力の回復が得られないとき、つ
まり空気比が増大しないときにガス流路を閉じて器具を
停止させるのである。また、ファンの回転数を増大させ
てから所定期間経過しても起電力が回復しない場合にガ
ス流路を閉じるようにしてもよい。In the embodiment described above, the thermocouple 9
Although the gas flow path is closed when the electromotive force decreases below a predetermined value, the rotation speed of the fan may be adjusted before the gas flow path is closed. In other words, when the air ratio is reduced due to a headwind from an exhaust duct (not shown) or a fin blockage, there is a case where the air conditioner can be used without stopping the combustor by increasing the rotation speed of the fan.
Therefore, when the electromotive force of the thermocouple 9 decreases to a preset level, when the rotation speed of the fan is increased and the recovery of the electromotive force is not obtained even when the predetermined rotation speed is reached, that is, when the air ratio is increased. When it does not increase, the gas flow path is closed to stop the instrument. Further, the gas flow path may be closed when the electromotive force does not recover even after a predetermined period of time has elapsed since the rotation speed of the fan was increased.
【００１７】また、熱電対９の起電力が常に一定値にな
るようにファン回転数を制御してもよい。つまり熱電対
９の起電力をフィードバック制御因子としてファンの回
転数を制御するのである。この場合、ファンの回転数が
所定範囲内に収まらない場合にはガス流路を閉じて不完
全燃焼を防止する。こうした熱電対９の起電力に基づく
制御は、燃焼安全装置１が風量不足や酸欠状態を非常に
敏感に検出するがゆえに（図の特性図参照）可能であ
り、従来のようなブンゼン燃焼のリフト検出では精度の
良い制御を望んでも無理である。尚、燃焼開始時におい
ては熱電対９の起電力が安定するまで制御動作を行わな
いようにする。The fan speed may be controlled so that the electromotive force of the thermocouple 9 is always constant. That is, the rotation speed of the fan is controlled using the electromotive force of the thermocouple 9 as a feedback control factor. In this case, when the rotation speed of the fan does not fall within the predetermined range, the gas passage is closed to prevent incomplete combustion. Such control based on the electromotive force of the thermocouple 9 is possible because the combustion safety device 1 very sensitively detects an insufficient air volume or an oxygen-deficient state (see the characteristic diagram in the figure). In the lift detection, it is impossible to control with high accuracy. At the start of combustion, the control operation is not performed until the electromotive force of the thermocouple 9 is stabilized.
【００１８】以上本発明の実施例について説明したが、
本発明はこうした実施例に何等限定されるものではな
く、例えば、熱電対１に代えて火炎電流を検出するフレ
ームロッド等の素子を用いてもよく、本発明の要旨を逸
脱しない範囲において、種々なる態様で実施し得ること
は勿論である。また、給湯器に限らずファンヒータ等の
燃焼器にも適用できる。更に、酸欠が心配されない外置
きタイプの器具においても、風量低下を検知するセンサ
として用いることができる。The embodiments of the present invention have been described above.
The present invention is not limited to such embodiments at all. For example, an element such as a flame rod for detecting a flame current may be used instead of the thermocouple 1, and various elements may be used without departing from the gist of the present invention. Of course, it can be carried out in an embodiment. Further, the present invention can be applied not only to a water heater but also to a combustor such as a fan heater. Further, even in the case of an external type appliance in which oxygen deficiency is not a concern, it can be used as a sensor for detecting a decrease in air volume.
【００１９】[0019]
【発明の効果】以上詳述したように、本発明の燃焼安全
装置によれば、燃焼器の給排気不良であっても室内の酸
欠であってもメインバーナの不完全燃焼を確実に防止す
ることができるという優れた効果を奏する。特に、燃焼
用空気の供給量不足に対しては、リフトした火炎が筒状
ガードの先端開口部で保炎するため、火炎位置を大きく
変化させることができ、火炎位置の変化検出を簡単に行
うことができる。 As described above in detail, according to the combustion safety device of the present invention , incomplete combustion of the main burner is surely prevented even if the supply / exhaust of the combustor is insufficient or the room is deficient in oxygen. An excellent effect is achieved. In particular, combustion
In response to insufficient air supply, the lifted flame is cylindrical.
Increase flame position to maintain flame at the opening at the tip of the guard
Can be changed to easily detect changes in the flame position.
I can.
【図１】一実施例としての燃焼安全装置の概略構成図で
ある。FIG. 1 is a schematic configuration diagram of a combustion safety device as one embodiment.
【図２】風量低下時における火炎の状態を表す説明図で
ある。FIG. 2 is an explanatory diagram illustrating a state of a flame when a flow rate is reduced.
【図３】空気比の変動に対する熱電対の起電力、ＣＯ濃
度特性を表すグラフである。FIG. 3 is a graph showing an electromotive force and a CO concentration characteristic of a thermocouple with respect to a change in an air ratio.
【図４】酸欠時における火炎の状態を表す説明図であ
る。FIG. 4 is an explanatory diagram illustrating a state of a flame when oxygen is lacking.
【図５】酸素濃度の変動に対する熱電対の起電力、ＣＯ
濃度特性を表すグラフである。FIG. 5: Thermocouple electromotive force, CO, with respect to variation in oxygen concentration
5 is a graph showing density characteristics.
【図６】熱電対の装着位置の変形例を表す概略構成図で
ある。FIG. 6 is a schematic configuration diagram illustrating a modification of a mounting position of a thermocouple.
【図７】他の実施例の燃焼安全装置の概略構成図であ
る。FIG. 7 is a schematic configuration diagram of a combustion safety device according to another embodiment.
【図８】他の実施例の燃焼安全装置の概略構成図であ
る。FIG. 8 is a schematic configuration diagram of a combustion safety device according to another embodiment.
【図９】ガス給湯器に燃焼安全装置を組み込んだ状態の
燃焼室を表す説明図である。FIG. 9 is an explanatory diagram showing a combustion chamber in a state where a combustion safety device is incorporated in a gas water heater.
【図１０】従来の燃焼安全装置の概略構成図である。FIG. 10 is a schematic configuration diagram of a conventional combustion safety device.
１…燃焼安全装置、 ４…多孔質プレート、 ５…予混
合バーナ、６…筒状ガード、 ９…熱電対。1: Combustion safety device, 4: Porous plate, 5: Premix burner, 6: Cylindrical guard, 9: Thermocouple.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F23N 5/10 F23N 5/24 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) F23N 5/10 F23N 5/24
Claims (1)
るメインバーナに隣接して、該メインバーナの空気供給
路中に配設される安全装置であって、複数の炎孔を形成した プレートを炎口形成面とした予混
合バーナと、上記 炎孔形成面を囲んで、上記炎孔形成面に形成される
火炎と上記予混合バーナの周囲の燃焼用空気との接触を
妨げるとともに、燃焼用空気の供給量不足により上記炎
孔形成面に形成される火炎がリフトしたとき先端開口部
にて保炎する筒状ガードと、 上記火炎の形成位置に応じた検知信号を出力する炎検知
素子とを備えてなる燃焼安全装置。 1. An air supply for a main burner adjacent to a main burner that forcibly takes in combustion air and burns the combustion air.
A safety device that is disposed in the road, the plate having a plurality of burner ports and burner port formation surface and the premix burner has, surrounding the burner ports formed surface is formed in the flame hole forming surface To
Keep the flame in contact with the combustion air around the premix burner.
In addition to the above, the flame
When the flame formed on the hole forming surface lifts, the tip opening
A combustion safety device comprising: a tubular guard that holds a flame in the above; and a flame detection element that outputs a detection signal in accordance with the flame formation position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04358213A JP3087200B2 (en) | 1992-12-24 | 1992-12-24 | Combustion safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04358213A JP3087200B2 (en) | 1992-12-24 | 1992-12-24 | Combustion safety device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06193867A JPH06193867A (en) | 1994-07-15 |
| JP3087200B2 true JP3087200B2 (en) | 2000-09-11 |
Family
ID=18458121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04358213A Expired - Lifetime JP3087200B2 (en) | 1992-12-24 | 1992-12-24 | Combustion safety device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3087200B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004036978A (en) * | 2002-07-02 | 2004-02-05 | Paloma Ind Ltd | Gas combustion appliance |
-
1992
- 1992-12-24 JP JP04358213A patent/JP3087200B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06193867A (en) | 1994-07-15 |
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