JPH081304B2 - Safety device for all primary combustors - Google Patents
Safety device for all primary combustorsInfo
- Publication number
- JPH081304B2 JPH081304B2 JP61093739A JP9373986A JPH081304B2 JP H081304 B2 JPH081304 B2 JP H081304B2 JP 61093739 A JP61093739 A JP 61093739A JP 9373986 A JP9373986 A JP 9373986A JP H081304 B2 JPH081304 B2 JP H081304B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- combustion
- fuel ratio
- exhaust gas
- burner
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
- F23N5/123—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
- F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Control Of Combustion (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、燃焼用空気を室内から採集し、排気も室内
に放出する室内開放型燃焼器において、排気ガス中の窒
素酸化物（NOX）を低減させる目的で全一次表面燃焼を
行なう場合の燃焼状態検出を行なう安全装置に関するも
のである。Description: TECHNICAL FIELD The present invention relates to an indoor open type combustor that collects combustion air from a room and also discharges exhaust gas into the room, and removes nitrogen oxides (NO X ) in exhaust gas. The present invention relates to a safety device that detects a combustion state when performing all primary surface combustion for the purpose of reduction.
従来の技術 従来、この種の燃焼器の安全装置は各種提案されてい
る。これ等の燃焼器は室内で使用するために室内の酸素
欠乏や、空燃比のずれ等により不完全燃焼となり有毒な
一酸化炭素（CO）が発生する前に何等かの処置を取る必
要がある。例えば特開昭59−145422号公報のような手段
が提案されている。第３図にその構成図、第４図に特性
図を示す。第３図でガスノズル１から噴出した燃料ガス
は混合管２で誘引空気と混合され燃料板３で燃焼する。
４は燃焼火炎内に挿入したフレームロッドで、バーナの
ケース５との間に電源６により電圧を印加し、火炎の炎
イオン電流を検知抵抗７で検出する構成である。第４図
はこの特性図で横軸に室内酸度濃度、縦軸に炎イオン電
流If、燃焼器から発生するCOガスの出力変化（相対値）
を示す。2. Description of the Related Art Conventionally, various safety devices for this type of combustor have been proposed. Since these combustors are used indoors, it is necessary to take some action before the generation of toxic carbon monoxide (CO) due to incomplete combustion due to lack of oxygen in the room, deviation of air-fuel ratio, etc. . For example, a means as disclosed in JP-A-59-145422 has been proposed. FIG. 3 shows the configuration diagram and FIG. 4 shows a characteristic diagram. In FIG. 3, the fuel gas ejected from the gas nozzle 1 is mixed with the induced air in the mixing pipe 2 and burned in the fuel plate 3.
Reference numeral 4 is a frame rod inserted into the combustion flame, and a voltage is applied between the flame rod and the case 5 of the burner by the power source 6 and the flame ion current of the flame is detected by the detection resistor 7. Fig. 4 is a graph showing this characteristic. The horizontal axis shows the indoor acidity concentration, the vertical axis shows the flame ion current I f , and the change in CO gas output from the combustor (relative value).
Indicates.
炎イオン電流は図のように酸素濃度の低下と共に増加
していく、従ってしきい値If1以上になった時に酸素欠
乏として燃焼を停止させる。また定常酸素濃度（約21
％）で、空気量が増減した場合、つまり空燃比が変化し
た場合においても不完全燃焼を防止するために検知可能
とするために、炎電流がしきい値If1を越えた場合、お
よびしきい値If2以下になった場合に検知するための２
つのしきい値を設けた構成としている。The flame ion current increases as the oxygen concentration decreases as shown in the figure. Therefore, when the flame ion current exceeds the threshold value I f1 , the combustion is stopped as oxygen deficiency. In addition, the steady-state oxygen concentration (about 21
%), If the amount of air increases or decreases, that is, even if the air-fuel ratio changes, to enable detection to prevent incomplete combustion, the flame current exceeds the threshold value I f1 , and 2 to detect when the threshold value becomes less than I f2
The configuration is provided with two thresholds.
発明が解決しようとする問題点 しかしながら、上記従来の構成では、空燃比のずれ
と、酸素欠乏の判定手段がないため18％の近傍の酸素欠
乏を検知するためのしきい値If1と、同じしきい値で空
燃比のずれを判定する必要がある。しかし酸欠時と空燃
比の変化時のCOの立上り特性が異なり、両方共COの立上
り前に判定することは困難を要した。この点はフレーム
ロッド４に替えて酸化スズ（SnO2）を使用した金属酸化
物半導体センサや、ジルコニア（ZrO2）を使用した固体
電解質を利用した酸素濃炎電池センサを使用した場合に
おいても同じことが言える。また第４図では炎電流Ifの
変化を相対値で示しているための変化が大きく見える
が、実際には、全一次表面燃焼器は第３図のように火炎
は燃焼板３の表面に密着して燃焼するために、フレーム
ロッド４で検知可能な炎イオン濃度が低く、炎電流Ifは
数マイクロアンペア以下となり非常に微少電流である。
また炎電流Ifの絶対値の変化量も微小となり第４図に示
すような２つのしきい値を設けることは実際上困難を極
めるという問題点があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional configuration, the difference between the air-fuel ratio and the threshold value I f1 for detecting oxygen deficiency in the vicinity of 18% because there is no oxygen deficiency determination means, the same It is necessary to judge the deviation of the air-fuel ratio with a threshold value. However, the rise characteristics of CO at the time of oxygen deficiency and at the time of change of the air-fuel ratio are different, and it was difficult to judge both before the rise of CO. In this respect, metal oxide semiconductor sensor using tin oxide in place of the frame rod 4 (S n O 2), was used oxygen concentration flame cell sensor using a solid electrolyte using zirconia (Z r O 2) The same is true in cases. Further, in FIG. 4, the change appears to be large because the change in flame current I f is shown as a relative value, but in reality, in all primary surface combustors, the flame is on the surface of the combustion plate 3 as shown in FIG. Since they burn in close contact with each other, the flame ion concentration that can be detected by the flame rod 4 is low, and the flame current If is several microamperes or less, which is a very small current.
Further, the amount of change in the absolute value of the flame current If is so small that it is actually difficult to provide two threshold values as shown in FIG.
問題点を解決するための手段 上記問題点を解決するために、本発明の全一次燃焼器
の安全装置は、室内空気を送風する送風機と、この空気
と燃料を混合して全一次燃焼する室内開放燃焼型バーナ
と、バーナの燃焼火炎に挿入したフレームロッドと、前
記バーナの排ガスに接して設けた排ガスセンサと、フレ
ームロッドと排ガスセンサの出力によりバーナの燃焼状
態を検出する燃焼状態検知部を有し、燃焼状態検知部に
は排ガスセンサの信号によりバーナの空燃比を判定する
空燃比検知部と、フレームロッドの信号により室内空気
の酸素欠乏を判定する酸欠検知部を有する構成としたも
のである。Means for Solving the Problems In order to solve the above problems, a safety device for all primary combustors of the present invention is a blower that blows indoor air, and a room that performs all primary combustion by mixing the air and fuel. An open combustion burner, a frame rod inserted into the combustion flame of the burner, an exhaust gas sensor provided in contact with the exhaust gas of the burner, and a combustion state detection unit that detects the combustion state of the burner by the output of the frame rod and the exhaust gas sensor. The combustion state detection unit has an air-fuel ratio detection unit that determines the air-fuel ratio of the burner based on the signal of the exhaust gas sensor, and an oxygen deficiency detection unit that determines the oxygen deficiency of the indoor air based on the signal of the frame rod. Is.
作用 本発明は上記した構成によって酸欠検知はフレームロ
ッドの信号により判定し、空燃比の検出は排ガスセンサ
の信号により判定する構成であるため、各々の判定しき
い値を任意に設定可能となり、各々最適な点で検知でき
るものである。Effect The present invention has the above-described configuration, the oxygen deficiency detection is determined by the signal of the frame rod, the detection of the air-fuel ratio is a configuration determined by the signal of the exhaust gas sensor, each determination threshold can be set arbitrarily, Each can be detected at the optimum point.
実施例 以下、本発明の実施例を添付図面にもとづいて説明す
る。第１図では本発明を石油燃焼器に応用した例で説明
する。燃焼灯油はオイルタンク８から燃料ポンプ９によ
り気化ヒータ10で加熱された気化混合室11に供給され
る。気化混合室11で燃料は気化され、送風機12からの燃
焼空気と混合され、バーナ13に導入され、多数の小孔14
を有する整流筒15から噴出し、点火器（図示せず）で点
火され、金網炎口16の表面に火炎を形成し、金網16を赤
熱して燃焼する。17はバーナ13を囲むガラス筒で、金網
16からの輻射熱を外部に放出すると共に燃焼排気通路18
を形成している。排気は排気口19から室内に放出する。
20は金網炎孔16に対向して設けたフレームロッドで火炎
の炎イオン電流を検知回路21で検知する。22は排ガス通
路21に設けた排ガスセンサで、実施例ではジルコニアに
よる酸素濃淡電池式センサを用いている。このセンサは
ジルコニア筒の内外面に蒸着した白金電極により、筒内
部の酸素濃度と外部の酸素濃度に差があった場合に起電
力が発生する周知のセンサである。図では筒外に燃焼排
ガス、筒内に室内空気を導入し、その濃度差により検知
回路23で排ガス中の残存酸素濃度を検出して、これによ
りバーナの空燃比を求めるものである。排ガスセンサ22
はジルコニアセンサ以外に酸化スズやチタニアを用いた
酸化物半導体酸素センサを使用しても良いが、これ等の
センサを利用する場合は出力は起電力でなく抵抗値変化
となる。検知回路21,23の出力は燃焼状態検知部24の酸
欠検知部25と空燃比検知部26に各々入力され、異常が判
定すると異常検知部27に出力する。異常検知部27で異常
検知するとリセット信号を出力し、バーナの燃焼を停止
する。異常検知部27はリセット信号を出す構成以外に空
燃比のずれが発生した場合に燃料流量や空気量を制御し
て最適な空燃比に戻すような空燃比フィードバック制御
を行なう構成でもよい。Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 illustrates an example in which the present invention is applied to an oil combustor. Combustion kerosene is supplied from an oil tank 8 to a vaporization mixing chamber 11 heated by a vaporization heater 10 by a fuel pump 9. The fuel is vaporized in the vaporization mixing chamber 11, mixed with the combustion air from the blower 12, introduced into the burner 13, and the small holes 14 are formed.
It is ejected from the rectifying cylinder 15 having the above, is ignited by an igniter (not shown), forms a flame on the surface of the wire net flame port 16, and the wire net 16 is red-heated and burned. 17 is a glass tube surrounding the burner 13, which is a wire mesh.
The radiant heat from 16 is released to the outside and the combustion exhaust passage 18
Is formed. Exhaust gas is discharged into the room through the exhaust port 19.
Reference numeral 20 denotes a frame rod provided so as to face the wire mesh flame hole 16, and the flame ion current of the flame is detected by the detection circuit 21. An exhaust gas sensor 22 is provided in the exhaust gas passage 21. In the embodiment, an oxygen concentration battery type sensor using zirconia is used. This sensor is a well-known sensor in which an electromotive force is generated by a platinum electrode deposited on the inner and outer surfaces of a zirconia cylinder when there is a difference between the oxygen concentration inside the cylinder and the oxygen concentration outside. In the figure, combustion exhaust gas is introduced outside the cylinder, and indoor air is introduced into the cylinder, and the residual oxygen concentration in the exhaust gas is detected by the detection circuit 23 based on the difference in concentration, and the air-fuel ratio of the burner is obtained by this. Exhaust gas sensor 22
In addition to the zirconia sensor, an oxide semiconductor oxygen sensor using tin oxide or titania may be used, but when these sensors are used, the output is not an electromotive force but a resistance value change. The outputs of the detection circuits 21 and 23 are respectively input to the oxygen deficiency detection unit 25 and the air-fuel ratio detection unit 26 of the combustion state detection unit 24, and output to the abnormality detection unit 27 when an abnormality is determined. When the abnormality detection unit 27 detects an abnormality, a reset signal is output and the burner combustion is stopped. The abnormality detection unit 27 may be configured to perform an air-fuel ratio feedback control that controls the fuel flow rate and the air amount to restore the optimum air-fuel ratio when an air-fuel ratio deviation occurs, in addition to the configuration that outputs the reset signal.
第２図に各々のセンサの特性図を示す。第２図ABはフ
レームロッド20による炎電流Ifの特性、第２図はCDのジ
ルコニア排ガスセンサの起電力esの特性を示し、ACは空
燃比が変化した場合の特性で、空燃比を空気比PAで示し
ている。ここで空気比PAは次式で現される。FIG. 2 shows a characteristic diagram of each sensor. Fig. 2 AB shows the characteristics of the flame current I f by the flame rod 20, Fig. 2 shows the characteristics of the electromotive force e s of the CD zirconia exhaust gas sensor, and AC is the characteristics when the air-fuel ratio changes. The air ratio PA is shown. Here, the air ratio PA is expressed by the following equation.
PA＝（実際の空気量／その燃焼量に必要な理論空気量） PAが大きい程燃料に比べて空気量が大きいことを示
し、PA＞１で燃焼している場合に全一次燃焼となる。PA = (actual air amount / theoretical air amount required for the combustion amount) The larger the PA, the larger the air amount compared to the fuel, and when PA> 1, the combustion is all primary combustion.
また第２図B,Dは室内空気の酸素濃度特性を示す。 2B and 2D show the oxygen concentration characteristics of indoor air.
フレームロッド20で検知した炎電流Ifは第２図Ａ特性
に示すように空気比PAに対してPA＝１を頂点とする山形
の特性を有する。ここでバーナ13が全一次燃焼バーナで
あるためPA＝1.5近傍で燃焼させる場合、炎電流Ifの変
化が非常に少ない。また第２図では示していないが炎電
流Ifの値もピーク点で数マイクロアンペアと非常に小さ
な値であり、またロッド20と金網16との距離等によりバ
ラツキが大きい。従って例えばPA1〜PA2の間の空気比内
に制御するために炎電流Ifの信号で判断することは非常
に難しい。一方第２図Ｃの排気ガスセンサ22の出力は図
のように空気比１を境に出力電圧esが大きく変化する。
これはPA＜１では燃焼排ガス中の残存酸素がほとんど零
であるのに対して、PA＞１では空気比に比例して残存酸
素が増加するためである。以上から排気センサ22の出力
は安定しており、取付場所や燃焼量の影響をほとんど受
けない。従って第２図Ｃのように上限しきい値es1と下
限しきい値es2を設けて、空燃比判定部28でes＞es1およ
びes＜es2となった時に空気比PAがPA1〜PA2の間からは
み出したとして異常検知部21に出力する。The flame current I f detected by the frame rod 20 has a mountain-shaped characteristic with PA = 1 as the apex with respect to the air ratio PA as shown in the characteristic of FIG. 2A. Here if burned in PA = 1.5 vicinity for burner 13 is an all primary combustion burner, the change in the flame current I f is very small. Although not shown in FIG. 2, the value of the flame current I f is a very small value of several microamperes at the peak point, and it varies greatly depending on the distance between the rod 20 and the wire net 16. Therefore, it is very difficult to judge by the signal of the flame current I f in order to control within the air ratio between PA 1 and PA 2 , for example. On the other hand, in the output of the exhaust gas sensor 22 in FIG. 2C, the output voltage e s greatly changes at the air ratio of 1 as shown in the figure.
This is because the residual oxygen in the combustion exhaust gas is almost zero when PA <1, whereas the residual oxygen increases in proportion to the air ratio when PA> 1. From the above, the output of the exhaust sensor 22 is stable and is hardly affected by the installation location and the amount of combustion. Therefore an upper limit threshold e s1 and lower thresholds e s2 as shown in Figure 2 C, and an air ratio PA when a e s> e s1 and e s <e s2 by the air-fuel ratio determining section 28 It outputs to the abnormality detection unit 21 as if it protrudes from between PA 1 and PA 2 .
一方、酸素濃度特性は室内酸素濃度が18％前後になれ
ば、室内空気の換気を促すか、酸欠異常として燃焼を停
止する必要がある。第２図Ｄ特性のように排ガスセンサ
22の出力は酸素濃度の変化に対して出力esの変化は異常
に緩い特性となる。酸素濃度がさらに低下すれば急激な
特性変化がある（図の破線）が、この時点では酸素濃度
18％を大きく下回り、危険である。一方第２図Ｂはフレ
ームロッド20の炎電流Ifの酸欠特性を示す。炎電流Ifは
酸素濃度の低下に伴ない増加していく。この増加率は大
きく空気化PA＝１のピーク電流値よりも高い値となる。
これは酸素欠乏時には、全体空気流量は変化せずにその
中の酸素量が減少していくために、火炎が金網表面から
伸びて、燃焼反応を行なう距離が大きくなる。従ってフ
レームロッド20が火炎に包み込まれることになり、炎イ
オンの検出し易くなるためである。これに対して空気比
PAを変化させた場合は、空気量全体が変るために火炎の
厚みに大きな変化がない。このためロッドと火炎の接触
面積が限られ炎電流は少ない。本発明は全一次表面を燃
焼バーナの以上の特異な特性に着眼し、酸素濃度が18％
近傍の炎電流Ifが酸素濃度21％の空気比１の時の最大炎
電流値よりも大きくなることを利用して酸欠しきい値を
If1に設定することにより、酸欠判定部29は空気比のず
れでは検出せず酸欠時のみ検出可能となる。On the other hand, regarding the oxygen concentration characteristics, if the indoor oxygen concentration is around 18%, it is necessary to promote ventilation of the indoor air or stop combustion as an oxygen deficiency abnormality. Exhaust gas sensor as shown in Fig. 2D
The output of 22 has a characteristic that the change of the output e s is abnormally gentle with respect to the change of the oxygen concentration. If the oxygen concentration further decreases, there will be a sharp change in characteristics (broken line in the figure), but at this point the oxygen concentration
It is well below 18% and dangerous. On the other hand, FIG. 2B shows the oxygen deficiency characteristic of the flame current I f of the frame rod 20. The flame current I f increases as the oxygen concentration decreases. This rate of increase is large and becomes a value higher than the peak current value of PA = 1.
This is because when oxygen is deficient, the total air flow rate does not change and the amount of oxygen therein decreases, so that the flame extends from the surface of the wire mesh and the combustion reaction distance increases. Therefore, the frame rod 20 is wrapped in the flame, and it becomes easier to detect flame ions. On the other hand, the air ratio
When the PA is changed, there is no large change in the thickness of the flame because the air volume changes. Therefore, the contact area between the rod and the flame is limited, and the flame current is small. The present invention focuses on the above peculiar characteristics of the combustion burner on the entire primary surface, and the oxygen concentration is 18%.
By taking advantage of the fact that the flame current I f in the vicinity becomes larger than the maximum flame current value when the oxygen ratio is 21% and the air ratio is 1,
By setting to I f1 , the oxygen deficiency determination unit 29 can detect only when oxygen deficiency is detected without detecting the deviation of the air ratio.
このように酸欠時はフレームロッドで検出し、空気比
（空燃比）のずれは排ガスセンサにより各々単独に検出
可能となる。As described above, when the oxygen deficiency is detected by the frame rod, the deviation of the air ratio (air-fuel ratio) can be detected individually by the exhaust gas sensor.
尚、本明細書の実施例では石油燃焼器に応用した例で
説明したがガス燃焼器においても全く同様の効果が得ら
れる。また排ガスセンサ22はジルコニア以外のものであ
っても実現可能である。さらにバーナ13の構成も実施例
以外の構成であっても全一次表面燃焼であれば、同等の
作用が得られる。第２図では各々しきい値を設けて、こ
の値から外れた場合にリセットする手段で説明したが、
センサの信号によりフィードバック制御するいわゆるA/
F制御のための信号として使用することも容易に考えら
れる。In addition, in the embodiment of the present specification, an example applied to an oil combustor has been described, but the same effect can be obtained in a gas combustor. Further, the exhaust gas sensor 22 can be realized by using a material other than zirconia. Furthermore, even if the burner 13 has a configuration other than that of the embodiment, the same effect can be obtained as long as it is all primary surface combustion. In FIG. 2, a threshold value is provided for each, and the means for resetting when the value deviates from this value has been explained.
The so-called A / that performs feedback control based on the sensor signal
It can easily be used as a signal for F control.
発明の効果 以上のように本発明の全一次燃焼器の安全装置によれ
ば次のような効果が得られる。EFFECTS OF THE INVENTION As described above, according to the safety device for an all primary combustor of the present invention, the following effects can be obtained.
（１）空燃比の判定と酸素欠乏の判定は各々単独のセン
サからの信号によりなされるために、各々任意の値に設
定可能となり、燃焼器として最適な点で制御可能とな
る。(1) Since the determination of the air-fuel ratio and the determination of oxygen deficiency are made by the signals from the respective independent sensors, they can be set to arbitrary values, and the combustor can be controlled at an optimum point.
（２）空燃比の判定は出力の安定している排ガスセンサ
で行ない、酸欠の判定は酸欠時に変化の大きいフレーム
ロッドの炎電流により検知する構成とし、お互いのセン
サの長所のみを利用するため、安全で確実な可能とな
る。(2) The air-fuel ratio is determined by an exhaust gas sensor with stable output, and the oxygen deficiency is determined by the flame current of the frame rod, which changes greatly during oxygen deficiency, and uses only the advantages of each other's sensors. Therefore, it is possible to be safe and reliable.
（３）バーナの着火や失火は両方のセンサ共検知可能な
ため、着火、失火検知に関してはダブルチエックとなり
一方のセンサが故障しても検知不能に至ることがなく安
全性が向上する。(3) Since both sensors can detect ignition and misfire of the burner, detection of ignition and misfire is a double check, and even if one of the sensors fails, it cannot be undetected and safety is improved.
第１図は本発明の一実施例における全一次燃焼器の安全
装置の制御ブロック図、第２図は各センサの検知特性
図、第３図は従来の全一次バーナの断面図、第４図はこ
の特性図である。 12……送風機、13……バーナ、20……フレームロッド、
22……排ガスセンサ、24……燃焼状態検知部、25……酸
欠検知部、26……空燃比検知部、28……空燃比判定部、
29……酸欠判定部、es1……空燃比上限しきい値、es2…
…空燃比下限しきい値、If1……酸欠しきい値。FIG. 1 is a control block diagram of a safety device for all primary combustors in one embodiment of the present invention, FIG. 2 is a detection characteristic diagram of each sensor, FIG. 3 is a sectional view of a conventional all primary burner, and FIG. Is this characteristic diagram. 12 …… Blower, 13 …… Burner, 20 …… Frame rod,
22 ... Exhaust gas sensor, 24 ... Combustion state detection unit, 25 ... Oxygen deficiency detection unit, 26 ... Air-fuel ratio detection unit, 28 ... Air-fuel ratio determination unit,
29 …… Oxygen deficiency determination unit, e s1 …… Air-fuel ratio upper limit threshold, e s2 ……
… Lower limit of air-fuel ratio, I f1 …… Oxygen deficiency threshold.
Claims (1)
燃料を混合して全一次燃焼する室内開放燃焼型バーナ
と、前記バーナの燃焼火炎に挿入したフレームロッド
と、前記バーナの燃焼排ガスに接して配置した排ガスセ
ンサと、前記フレームロッドおよび排ガスセンサの出力
により前記バーナの燃焼状態を検出する燃焼状態検知部
を有し、前記燃焼状態検知部には排ガスセンサの検知信
号と空燃比上限しきい値および空燃比下限しきい値とを
比較してこの間から外れたことを検出する空燃比判定部
により空燃比異常を判定して異常検知部に信号を出力す
る空燃比検知部、およびフレームロッドの検知電流信号
と室内空気の酸素濃度が予め定められた値に低下したと
きのフレームロッドの検知電流信号と、室内空気の酸素
濃度が予め定められた値に低下したときのフレームロッ
ドの検知電流値に設定した酸欠しきい値を比較する酸欠
判定部により室内空気の酸素欠乏を判定して、異常検知
部に信号を出力する酸欠検知部を有する構成とした全一
次燃焼器の安全装置。1. A blower for blowing indoor air, an indoor open combustion type burner which mixes the air and fuel to carry out primary combustion, a frame rod inserted into the combustion flame of the burner, and combustion exhaust gas of the burner. An exhaust gas sensor arranged in contact with each other, and a combustion state detection unit for detecting the combustion state of the burner by the output of the frame rod and the exhaust gas sensor, and the combustion state detection unit has a detection signal of the exhaust gas sensor and an air-fuel ratio upper limit. The threshold value and the lower limit of the air-fuel ratio are compared to detect that the air-fuel ratio is out of this range.The air-fuel ratio determination section determines the air-fuel ratio abnormality and outputs a signal to the abnormality detection section. Of the detection current signal of the frame rod and the oxygen concentration of the room air when the oxygen concentration of the room air drops to a predetermined value The oxygen deficiency determination unit that compares the oxygen deficiency threshold set to the detected current value of the frame rod when the temperature drops to 0 is used to determine the oxygen deficiency in the room air and output an oxygen deficiency detection unit that outputs a signal to the abnormality detection unit. Safety device for all primary combustors configured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61093739A JPH081304B2 (en) | 1986-04-23 | 1986-04-23 | Safety device for all primary combustors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61093739A JPH081304B2 (en) | 1986-04-23 | 1986-04-23 | Safety device for all primary combustors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62252827A JPS62252827A (en) | 1987-11-04 |
| JPH081304B2 true JPH081304B2 (en) | 1996-01-10 |
Family
ID=14090777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61093739A Expired - Lifetime JPH081304B2 (en) | 1986-04-23 | 1986-04-23 | Safety device for all primary combustors |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH081304B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103666571A (en) * | 2013-11-26 | 2014-03-26 | 潘高峰 | Gas producer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60235915A (en) * | 1984-05-10 | 1985-11-22 | Matsushita Electric Ind Co Ltd | Burning safety device |
-
1986
- 1986-04-23 JP JP61093739A patent/JPH081304B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62252827A (en) | 1987-11-04 |
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