JPS6080758A - Detector for oxygen concentration - Google Patents

Detector for oxygen concentration

Info

Publication number
JPS6080758A
JPS6080758A JP58190440A JP19044083A JPS6080758A JP S6080758 A JPS6080758 A JP S6080758A JP 58190440 A JP58190440 A JP 58190440A JP 19044083 A JP19044083 A JP 19044083A JP S6080758 A JPS6080758 A JP S6080758A
Authority
JP
Japan
Prior art keywords
combustion
output
signal
flame current
circuit
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.)
Granted
Application number
JP58190440A
Other languages
Japanese (ja)
Other versions
JPH0317296B2 (en
Inventor
Mitsutaka Maruyama
丸山　三孝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dainichi Kogyo Co Ltd
Original Assignee
Dainichi Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dainichi Kogyo Co Ltd filed Critical Dainichi Kogyo Co Ltd
Priority to JP58190440A priority Critical patent/JPS6080758A/en
Publication of JPS6080758A publication Critical patent/JPS6080758A/en
Publication of JPH0317296B2 publication Critical patent/JPH0317296B2/ja
Granted legal-status Critical Current

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
    • F23N5/003—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
    • 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
    • F23N2231/00—Fail safe
    • F23N2231/20—Warning devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/20—Warning devices
    • F23N2231/22—Warning devices using warning lamps

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Combustion (AREA)

Abstract

PURPOSE:To improve precision and reliability of detection by maintaining always set oxygen concn. as criterion for oxygen deficiency with regard to optional amt. of combustion, namely, to optional power generation. CONSTITUTION:An ignition current value is detected by an ignition current detecting circuit 6. The ignition current value inputted to an ignition current signal comparing circuit 8 as stable ignition current output by an ignition current output circuit 7 is held always at a higher value than a criterion current signal inputted to the ignition current signal comparing circuit 8 after being converted from a combustion amt. controlling output depending on an oxygen concn. (e.g. 18%) set as a limit of oxygen deficiency condition for a criterion signal converting circuit 5. As oxygen concn. of the air for combustion decreases, the output value of the ignition current approaches the criterion current signal value. When the oxygen concn. decreases beyond 18%, the ignition current value becomes smaller than the criterion current signal value. The ignition current signal comparing circuit 8 generates in this state an alarm signal finally, and an alarm output circuit 9 operates to actuate an alarm lamp or buzzer, etc. and performs combustion interrupting operation successively or simultaneously, and automatically.

Description

【発明の詳細な説明】 中の酸素濃度の低下を炎電流の変化によって検出する酸
素濃度検出装置の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in an oxygen concentration detection device that detects a decrease in oxygen concentration in a flame by a change in flame current.

ガス又は石油等を燃焼させて暖房や給湯などを行う燃焼
機器は、閉め切フた室内等で使用するときは室内の空気
中の酸素を消費し炭酸ガスなどを放出するが、燃焼用空
気中の酸素濃度が低下するにつれてバーナーは不完全燃
焼を起し、その結果として一酸化炭素の発生量が増加し
きわめて危険な状態例至る。従ってこのような室内で燃
焼用機器を使用するときは、時々窓等を開放して換気を
図り空気中の酸素濃度を回復させる必要があるが、空気
の組成変ｆヒは人間の感覚では検知することができない
ため、空気の酸素濃度の低下を検出して警報を発し又は
安全装置を作動させるだめの装置が大いに有用とされて
いる。Combustion equipment that burns gas or oil for space heating, hot water, etc. consumes oxygen in the indoor air and releases carbon dioxide gas when used in a closed room, etc. As the oxygen concentration decreases, the burner undergoes incomplete combustion, resulting in increased carbon monoxide production, which can be extremely dangerous. Therefore, when using combustion equipment in a room like this, it is necessary to occasionally open windows, etc. for ventilation to restore the oxygen concentration in the air, but changes in the composition of the air cannot be detected by human senses. Therefore, a device that detects a decrease in the oxygen concentration of the air and issues an alarm or activates a safety device is considered to be very useful.

従来このような目的に適する装置上して、燃焼用空気の
酸素濃度の低下によって引き起される炎中の燃焼状態の
変化を、炎電流の変化として検出するものがあった。す
なわち燃焼炎中に先端が突出するような針電極をバーナ
ーと絶縁して設け、電極にはバーナーに対して正の電圧
（たとえば３０Ｖ）を印加し、電極からバーナーに向っ
て流れる炎電流が、バーナーに供給される燃焼用空気の
酸素濃度の低下にはソ比例して減少するという現象を利
用して、炎電流を常時検出し、炎電流がある設定限度よ
り低い値を示したときに酸素濃度が低下したものと判断
して燃焼を停止する機能をもつような装置である。Conventionally, there has been a device suitable for such a purpose that detects a change in the combustion state in the flame caused by a decrease in the oxygen concentration of the combustion air as a change in flame current. That is, a needle electrode whose tip protrudes into the combustion flame is provided insulated from the burner, and a positive voltage (for example, 30 V) relative to the burner is applied to the electrode, so that the flame current flows from the electrode toward the burner. Taking advantage of the phenomenon that the oxygen concentration in the combustion air supplied to the burner decreases in proportion to the decrease in oxygen concentration, the flame current is constantly detected, and when the flame current shows a value lower than a certain set limit, the oxygen This device has the function of determining that the concentration has decreased and stopping combustion.

このような装置は有用ではあるものの酸素濃度以外の変
動要因を区別して判断することができないという欠点が
ある。すなわち燃焼用空気の酸素濃度が変化したときば
かりでなく、ノ＜−ナーに供給される燃料の量の変化や
、空気と燃料との比率の変化などによって燃焼状態が変
化するときにも炎電流が変化するから、負荷に応じて火
力を調節しようとするときは、たとえば小火力のときの
炎電流の低下を酸素濃度の低下と誤判断し、また大火力
のときには炎電流値が大きく、酸素濃度の低下を検出で
きないという不都合がおこる。このような不都合に対応
するために、火力の切りかえの可能な燃焼機器にあって
は、切りかえに際してそれぞれ火力に応じて設定された
一定の補正電流を炎電流に加えることで炎電流の限度設
定値を変えることなく酸素濃度の低下を検出することが
可能となっている。Although such a device is useful, it has a drawback in that it cannot distinguish and judge fluctuation factors other than oxygen concentration. In other words, the flame current increases not only when the oxygen concentration of the combustion air changes, but also when the combustion conditions change due to changes in the amount of fuel supplied to the nozzle or the ratio of air to fuel. Therefore, when trying to adjust the fire power according to the load, for example, a decrease in flame current at low fire power is mistakenly judged as a decrease in oxygen concentration, and at large fire power, the flame current value is large and oxygen This causes the inconvenience that a decrease in concentration cannot be detected. In order to deal with such inconveniences, in combustion equipment that can switch the heating power, a fixed correction current set according to the heating power is added to the flame current when switching, so that the limit set value of the flame current can be adjusted. It is now possible to detect a decrease in oxygen concentration without changing the oxygen concentration.

しかし、このような改良手段では、火力を大火力から小
火力まで連続的に調節可能な燃焼用機器にありては、火
力に対応して補正電流値を連続的に変化させることが容
易ではなく、誤差が多く必ずしも満足すべきものではな
かった。However, with such improvement means, it is not easy to continuously change the correction current value in response to the firepower in combustion equipment that can continuously adjust the firepower from large firepower to small firepower. However, there were many errors and the result was not necessarily satisfactory.

本発明は、火力の調節に対応して炎電流の限度設定値を
変化させて酸素濃度の検出精度を高めようとするもので
あり、特に限度設定値を燃料の供給量の変更に対応して
自動的に変更することにようて、酸素濃度以外の変動要
因による装置、の誤動作がおこる可能性をなくし、燃焼
用空気の酸素濃度の低下を常に精度よく検出することを
可能としたものである。The present invention aims to improve the detection accuracy of oxygen concentration by changing the flame current limit set value in response to the adjustment of the thermal power, and in particular, by changing the limit set value in response to changes in the fuel supply amount. Automatic change eliminates the possibility of malfunction of the device due to fluctuation factors other than oxygen concentration, and makes it possible to always accurately detect a decrease in oxygen concentration in combustion air. .

このような本発明の目的は、 （ａ）バーナーへの燃料供給量を制御する燃料供給手段
を駆動するだめの制御信号に従い燃料供給量に比例する
制御出力を発光する燃焼量制御出力回路と、 （ｂ）前記燃焼出力を入力して判定基準出力信号に変換
して出力する判定基準信号変換回路と、（Ｃ）バーナー
と絶縁されていて燃焼炎中に突出するように設けられた
炎電流検出電極と、 （ｄ）前記炎電流検出電極に正の電圧を加えたときに生
ずる炎電流を検出するための炎電流検出回路（Ｑ）前記
炎電流検出信号を入力して炎電流出力に変換する炎電流
出力回路と。The objects of the present invention are as follows: (a) a combustion amount control output circuit that emits a control output proportional to the amount of fuel supplied in accordance with a control signal for driving a fuel supply means that controls the amount of fuel supplied to the burner; (b) a judgment reference signal conversion circuit that inputs the combustion output, converts it into a judgment reference output signal, and outputs the signal; and (C) a flame current detection circuit that is insulated from the burner and protrudes into the combustion flame. (d) a flame current detection circuit for detecting flame current generated when a positive voltage is applied to the flame current detection electrode; (Q) inputting the flame current detection signal and converting it into a flame current output; With flame current output circuit.

（ｆ＞前記判定基準信号と前記炎電流出力とを比較して
、 炎電流信号く判定基準出力信号 であるときに警報信号を出力する炎電流信号比較回路と
、 （ｇ）前記警報信号を入力して注意警報器または燃焼停
止用遮断回路を駆動するだめの制御出力を発生すること
ができる警報出力回路と を備えた酸素濃度検出装置を燃焼機器に設けることによ
り達成される。(f> a flame current signal comparison circuit that compares the judgment reference signal and the flame current output and outputs an alarm signal when the flame current signal is the judgment reference output signal; (g) inputs the alarm signal; This can be achieved by providing the combustion equipment with an oxygen concentration detection device equipped with an alarm output circuit capable of generating a control output for driving a caution alarm or a combustion stop cut-off circuit.

本発明の装置を備えた燃焼機器は、燃焼量を任意に調節
できるものであるとき、すなわち従来の装置では酸素濃
度の検出精度が低下するのを防ぎ得ないようなときでも
精度のよい酸素濃度の検出を行うことができる。そして
能カ一杯の大火力の燃焼状態から、ごく弱い小火力の燃
焼状態までの広い範囲内で任意の燃焼状態をえらんでも
、常に最適の検出精度を維持することができるので、酸
素濃度が低下しているのに警報や安全装置作動がおくれ
で被害を生じたり、酸素濃度が低下しないのに安全装置
が作動して消火したりする不便さがなく、燃焼機器の操
作に未熟の者でも安心して使用することができるという
すぐれた性能を持つものである。A combustion device equipped with the device of the present invention can adjust the amount of combustion as desired, that is, it can detect oxygen concentration with high accuracy even when conventional devices cannot prevent the detection accuracy of oxygen concentration from decreasing. can be detected. And even if you select any combustion state within a wide range, from a combustion state with a large thermal power at full capacity to a combustion state with a very weak small thermal power, the optimum detection accuracy can always be maintained, so the oxygen concentration will decrease. There is no inconvenience caused by delays in activation of alarms and safety devices even when the oxygen concentration has decreased, or safety devices activated and extinguishing fires even when the oxygen concentration has not decreased, making it safe even for people who are inexperienced in operating combustion equipment. It has excellent performance and can be used with care.

本発明の装置Ｋを第１図の例によって説明する。The device K of the present invention will be explained using the example of FIG.

この例では、石油を燃料ポンプによってバーナーに圧送
し燃焼させる液体燃料燃焼器（図示せず）に組合せて設
けられている酸素濃度検出装置であるが、燃１ポンプ（
１）は、たとえばバーナー（２）によりて加熱される対
象の温度を一定に保つような制御回路から出される燃焼
量制御出力に比例した送油量で運転されるようになって
いる。この場合ポンプ（１）の制御出力のうちの電圧値
・電流値・電流パルス巾・周波数値など適当なものをえ
らんで燃料供給量に比例する燃焼出力とすることができ
るが、燃焼量制御出力回路（４）は、温度検出器などか
らの入力信号によってポンプの制御出力を発生するよう
になフている。（５）は、判定基準信号変換回路であっ
て（４）からの制御出力を受けてこれを炎電流と比較可
能な判定基準電流信号に変換しく８）の炎電流信号比較
回路へ送っている。他方燃料ポンプから送られた燃料は
接地されたバーナー（２）で燃焼し、その炎の中に突出
するように設けられた炎電流検出電極（３）には炎電流
検出回路（６）から正の電圧が加えられ、炎電流をとり
出すことができるようになっている。炎電流検出回路で
検出された炎電流信号は、炎電流出力回路（７）に入力
され、安定した炎電流出力に変換され、炎電流信号比較
回路（８）に送り込まれる。炎電流信号比較回路では、
炎電流出力の値が判定基準電流信号の値と比較され炎電
流の値が判定基準電流よりも小さいときに警報信号を発
生するようになっているが、この警報信号は（９）の警
報出力回路に入力されると燃焼異當を知らせるだめの注
意警報器まだは安全のだめに燃焼を停止する遮断スイッ
チ等を駆動する側脚出力が発生するようになっている。In this example, the oxygen concentration detection device is installed in combination with a liquid fuel combustor (not shown) that uses a fuel pump to pump petroleum to a burner and combusts it.
1) is operated with an oil supply amount proportional to a combustion amount control output output from a control circuit that keeps the temperature of the object heated by the burner (2) constant, for example. In this case, the combustion output can be made proportional to the fuel supply amount by selecting an appropriate voltage value, current value, current pulse width, frequency value, etc. from the control output of the pump (1), but the combustion amount control output The circuit (4) is adapted to generate a control output for the pump in response to an input signal from a temperature sensor or the like. (5) is a judgment reference signal conversion circuit which receives the control output from (4), converts it into a judgment reference current signal that can be compared with the flame current, and sends it to the flame current signal comparison circuit in 8). . On the other hand, the fuel sent from the fuel pump is burned in a grounded burner (2), and a flame current detection electrode (3) protruding into the flame receives a positive signal from a flame current detection circuit (6). voltage is applied to it, allowing flame current to be extracted. The flame current signal detected by the flame current detection circuit is input to the flame current output circuit (7), converted to a stable flame current output, and sent to the flame current signal comparison circuit (8). In the flame current signal comparison circuit,
The value of the flame current output is compared with the value of the judgment reference current signal, and when the value of the flame current is smaller than the judgment reference current, an alarm signal is generated, but this alarm signal is the alarm output of (9) When input to the circuit, a side leg output is generated to drive a cutoff switch, etc. to stop combustion if it is not safe to do so, as well as a warning alarm to notify of abnormal combustion.

このような構成の燃焼装置が通常に燃焼作動していると
き、空気中の酸素濃度が通常の２１チである場合の炎電
流値は燃料の供給量が減小するに従９て小さな値を示す
が、空気中の酸素濃度が低下するに従ってまた炎電流値
は小さくなる。このよ燃料供給量と炎電流値の関係を燃
焼用空気の酸素濃度ごとにグラフにしたものを図２に示
しだ。このグラフでは、燃料供給量がＦである場合に、
新鮮な空気中で燃焼が行われているとき、炎電流値は五
に相当する大きさを示すが、空気中の酸素がそれぞれ１
９チ・１８％・・・と減少すれば、炎電流値はそれぞれ
■・π・・・というように低下することを示している。When a combustion device with such a configuration is in normal combustion operation, the flame current value when the oxygen concentration in the air is the normal 21% decreases as the amount of fuel supplied decreases. As shown, as the oxygen concentration in the air decreases, the flame current value also decreases. Figure 2 shows a graph of the relationship between fuel supply amount and flame current value for each oxygen concentration of combustion air. In this graph, when the fuel supply amount is F,
When combustion is carried out in fresh air, the flame current value is as large as 5, while the oxygen in the air is 1
It is shown that if the flame current value decreases by 9chi, 18%, etc., the flame current value decreases by ■, pi, etc., respectively.

そしてまだ、燃料供給量が〆となったときには炎電流値
は、空気中の酸素濃度のそれぞれ２１チ・１９ｑ６・１
８チ・・・に対応してπ・アＩ。When the fuel supply amount reaches its limit, the flame current value is 21 cm, 19q6, and 1% of the oxygen concentration in the air, respectively.
π・AI corresponds to 8chi...

ド・・・と変化する。It changes like...

本発明の酸素濃度検出装置は、あらかじめ測定によりめ
られているポンプの燃料送出量を制御するだめの燃焼量
制御出力と種々の酸素濃度の空気を用いてバーナーでの
燃焼を行ったときの炎電流値との関係に従って、判定基
準信号変換回路（５）中に組み込、んだ演算回路によっ
て燃焼量制御出力値が入力されたときそれに対応する炎
電流値に相当する判定基準電流信号を発生するように構
成されている。そしてこの判定基準信号変換回路（！５
）は酸素濃度値を、たとえば１日チと指定することによ
り、図２において燃焼量制御出力（すなわち燃料供給量
）に対応して曲線Ｃｄによって規定されるような判定基
準電流信号を発生するようになっている。The oxygen concentration detection device of the present invention detects the flame when combustion is performed in a burner using air with various oxygen concentrations and the combustion amount control output for controlling the fuel delivery amount of the pump, which is determined in advance by measurement. It is incorporated into the judgment reference signal conversion circuit (5) according to the relationship with the current value, and when the combustion amount control output value is input by the solder calculation circuit, it generates a judgment reference current signal corresponding to the corresponding flame current value. is configured to do so. And this judgment reference signal conversion circuit (!5
) is designed to generate a judgment reference current signal as defined by the curve Cd corresponding to the combustion amount control output (i.e., fuel supply amount) in FIG. 2 by specifying the oxygen concentration value as, for example, 1 day. It has become.

このような本発明の酸素濃度検出装置を備えだ燃焼機器
が新鮮な燃焼用空気によって通常の燃焼を行っていると
きは、常に曲線ＡＡ′によって規定されるような炎電流
値を示すから、炎電流検出回路（６）で検出され、炎電
流出力回路（７）によって安定した炎電流出力として炎
電流信号比較回路（８）に入力された炎電流値は、酸欠
状態の限界として判定基準信号変換回路（５）に設定さ
れた酸素濃度たとえば１日チに従って燃焼量制御出力か
ら変換されて炎電流信号比較回路（８）に入力される判
定基準電流信号より、常に高い値を維持している。そし
て燃料の供給量の大小にかかわらず、燃焼用空気の酸素
濃度が低下するに従い炎電流出力値は判定基準電流信号
値に近づき、酸素濃度が１８％を割ると炎電流値は判定
基準電流信号値より小さくなる。炎電流信号比較回路（
８）は、ここに至ってはじめて警報信号号を発生し、警
報出力回路（９）が働いて警報用ランプやブザー等を作
動させ、または燃料用の緊急遮断弁や緊急遮断スイッチ
等を切るなどの燃焼中断操作を、順次または同時に、そ
して自動的に行わせることができるのである。When a combustion device equipped with such an oxygen concentration detection device of the present invention performs normal combustion using fresh combustion air, it always shows a flame current value defined by curve AA'. The flame current value detected by the current detection circuit (6) and inputted to the flame current signal comparison circuit (8) as a stable flame current output by the flame current output circuit (7) is used as a judgment reference signal as the limit of oxygen deficiency state. The oxygen concentration set in the conversion circuit (5), for example, always maintains a value higher than the judgment reference current signal that is converted from the combustion amount control output and input to the flame current signal comparison circuit (8) according to the daily temperature. . Regardless of the amount of fuel supplied, as the oxygen concentration of the combustion air decreases, the flame current output value approaches the judgment reference current signal value, and when the oxygen concentration falls below 18%, the flame current value changes to the judgment reference current signal value. becomes smaller than the value. Flame current signal comparison circuit (
8) is the first time that an alarm signal is generated, and the alarm output circuit (9) is activated to activate an alarm lamp, buzzer, etc., or to turn off the fuel emergency cutoff valve, emergency cutoff switch, etc. Combustion interruption operations can be performed sequentially or simultaneously and automatically.

以上のように、本発明の装置は、任意の燃焼量すなわち
任意の火力に対して、設定された酸素濃度を酸欠の判定
基準として常に維持することができるので、燃焼量を負
荷に応じて連続可変的に制御するようにした燃焼機器に
とっては特に精度が高く信頼でき、有効な酸素濃度検出
装置である。As described above, the device of the present invention can always maintain the set oxygen concentration as the criterion for oxygen deficiency for any combustion amount, that is, any heating power, so the combustion amount can be adjusted according to the load. It is a highly accurate, reliable, and effective oxygen concentration detection device, especially for combustion equipment that is continuously and variably controlled.

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

第１図は本発明の酸素濃度検出装置の回路構成図である
。 第２図は燃料供給量（又は燃焼量制輝出カ）と炎電流値
（又は判定基準電流信号値）との関係を表わすグラフで
ある。 １・・・燃料ポンプ、２・・・バーナー、３・・・炎電
流検出電極、４・・・燃焼量制御出力回路、５・０・判
定基準信号変換回路、６・・・炎電流検出回路、７・・
・炎電流出力回路、８・・・炎電流信号比較回路、９・
・・警報出力回路、　１０・・・温度検出制御回路、１
１・・・警報ブザ−，１２・・・緊急遮断スイッチ。FIG. 1 is a circuit diagram of the oxygen concentration detection device of the present invention. FIG. 2 is a graph showing the relationship between the fuel supply amount (or combustion amount control output) and the flame current value (or determination reference current signal value). DESCRIPTION OF SYMBOLS 1...Fuel pump, 2...Burner, 3...Flame current detection electrode, 4...Combustion amount control output circuit, 5.0.Judgment reference signal conversion circuit, 6...Flame current detection circuit ,7...
・Flame current output circuit, 8...Flame current signal comparison circuit, 9.
...Alarm output circuit, 10...Temperature detection control circuit, 1
1...Alarm buzzer, 12...Emergency cutoff switch.

Claims (1)

【特許請求の範囲】 ｌ燃焼量を連続的に調節することができる燃焼機器に設
けられた、燃焼用空気の酸素濃度を検知するだめの装置
において、 （ａ）バーナーへの燃料供給量を制御する燃料供給手段
を駆動するだめの制御信号に従い燃料供給量に比例する
割病１出力を発生する燃焼量制御出方回路と、 （ｂ）前記燃焼出力を入力して判定基準出力信号に変換
１〜て出ノ〕する判定基準信号変換回路と、（０）バー
ナーと絶縁されていて燃焼炎中に突出するように設けら
れた炎電流検出電極と、 （ｄ）前記炎電流検出電極に正の電圧を加えたときに生
ずる炎電流を検出するだめの炎電流検出回路と、 （ｅ）前記炎電流検出信号を入力して炎電流出力に変換
する炎電流出力回路と、 （ｆ）前記判定基準信号と前記炎電流出力とを比較して
、 炎電流信号く判定基準出力信号 であるときに警報信号を出力する炎電流信号比較回路と
、 （Ｅ）前記警報信号を入力して注意警報器または燃焼停
止用遮断回路を駆動するだめの制量出力を発生すること
ができる警報出力回路と を備えだことを特徴とする酸素濃度検出装置。[Scope of Claims] 1. A device for detecting the oxygen concentration of combustion air, which is installed in a combustion device that can continuously adjust the amount of combustion, comprising: (a) controlling the amount of fuel supplied to the burner; (b) a combustion amount control output circuit that generates an output proportional to the amount of fuel supplied according to a control signal of a fuel supply means for driving a fuel supply means; (b) inputting the combustion output and converting it into a judgment reference output signal; (0) a flame current detection electrode insulated from the burner and provided so as to protrude into the combustion flame; (d) a positive electrode to the flame current detection electrode; (e) a flame current output circuit that inputs the flame current detection signal and converts it into a flame current output; (f) the judgment criterion. a flame current signal comparison circuit that compares the signal with the flame current output and outputs an alarm signal when the flame current signal is a judgment reference output signal; An oxygen concentration detection device comprising: an alarm output circuit capable of generating a control output for driving a combustion stop cutoff circuit.
JP58190440A 1983-10-11 1983-10-11 Detector for oxygen concentration Granted JPS6080758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58190440A JPS6080758A (en) 1983-10-11 1983-10-11 Detector for oxygen concentration

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58190440A JPS6080758A (en) 1983-10-11 1983-10-11 Detector for oxygen concentration

Publications (2)

Publication Number Publication Date
JPS6080758A true JPS6080758A (en) 1985-05-08
JPH0317296B2 JPH0317296B2 (en) 1991-03-07

Family

ID=16258167

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58190440A Granted JPS6080758A (en) 1983-10-11 1983-10-11 Detector for oxygen concentration

Country Status (1)

Country Link
JP (1) JPS6080758A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62142918A (en) * 1985-12-17 1987-06-26 Matsushita Electric Ind Co Ltd Combustion control device
JPS63108114A (en) * 1986-05-07 1988-05-13 Rinnai Corp Combustion device
US4770628A (en) * 1985-11-09 1988-09-13 Toyotomi Kogyo Co., Ltd. Abnormal combustion detecting construction for burner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5424131U (en) * 1977-07-20 1979-02-16

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5424131B2 (en) * 1972-06-30 1979-08-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5424131U (en) * 1977-07-20 1979-02-16

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4770628A (en) * 1985-11-09 1988-09-13 Toyotomi Kogyo Co., Ltd. Abnormal combustion detecting construction for burner
JPS62142918A (en) * 1985-12-17 1987-06-26 Matsushita Electric Ind Co Ltd Combustion control device
JPS63108114A (en) * 1986-05-07 1988-05-13 Rinnai Corp Combustion device

Also Published As

Publication number Publication date
JPH0317296B2 (en) 1991-03-07

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